A replaceable conductive dual-probe vortex flow meter

Abstract

This utility model discloses a replaceable conductive dual-probe vortex flow meter, belonging to the field of fluid measurement. It includes a meter body with a first piezoelectric sensor module connected through-to the side. The first piezoelectric sensor module includes a cross-shaped tooth. A pressure relief protective sleeve and a screw are sequentially fixedly connected along the axis from the outside to the inside of the cross-shaped tooth. A retaining tooth and a sensor are sequentially fixedly connected along the axis from the outside to the inside of the screw. A threaded sleeve is threadedly connected to the outside of the screw. A torque disk is rotatably connected to the bottom of the threaded sleeve. A spring is fitted around the outside of the torque disk. A sealing door is fixedly connected to the bottom of the torque disk. A sealing chamber is rotatably connected to the bottom of the sealing door via a rotating shaft. This utility model, through its integrated parallel sensor cavity structure with dual isolation valves, enables pressurized online replacement and maintenance of the piezoelectric sensor without affecting the main pipeline's process fluid transport, ensuring continuous system operation and high availability for measurement.

Description

Technical Field

[0001] This utility model relates to the field of fluid measurement technology, and in particular to a replaceable conductive dual-probe vortex flow meter. Background Technology

[0002] When a non-streamlined obstructing fluid (called a vortex generator) is placed in a fluid, two rows of regularly arranged vortices with opposite rotation directions will alternately separate on both sides downstream of the fluid as the fluid flows through it. The frequency of these vortices is proportional to the fluid velocity. By measuring this frequency, the fluid velocity and volumetric flow rate can be calculated.

[0003] There is a fixed relationship between the frequency f of vortex separation and the average flow velocity v of the fluid and the characteristic width d of the obstruction, namely f = St × v / d, where St is the Strouhal number, which is a dimensionless constant. The value of St remains almost constant over a wide range of Reynolds numbers, which ensures that the frequency f is linearly proportional to the flow velocity v. This is the theoretical basis for the accurate measurement of vortex flow meters.

[0004] Vortex flow meters detect minute pressure changes or vibrations caused by alternating vortices through piezoelectric sensors installed inside the fluid flow barrier. The detection circuit processes and amplifies the sensor signal, converting it into a pulse signal proportional to the frequency. The microprocessor inside the instrument then calculates the instantaneous volumetric flow rate and cumulative flow rate using the formula Q = A × v (where A is the cross-sectional area of ​​the pipe). Currently, while commonly used vortex flow meters can meet the requirements for stationary fluid detection, they still have the following shortcomings:

[0005] 1. Traditional vortex flow meters require the density parameters of the medium to be pre-input into the system when measuring mass flow rate. Based on the physical properties of the fluid, the pre-input density parameters of the medium and the fluid velocity, the mass flow rate of the fluid is calculated.

[0006] 2. During the vortex shedding process, the vortex flow meter will induce fluid oscillation. At a specific frequency, this oscillation will couple with the mechanical natural frequency of the sensor or the meter body, resulting in resonance. The piezoelectric sensor module is in a resonant state for a long time. Alternating stress will cause fatigue failure of the piezoelectric sensing element, and may also cause loosening of internal connectors or structural damage, thereby affecting the long-term metering reliability and structural integrity of the instrument.

[0007] Therefore, a replaceable conductive dual-probe vortex flow meter is proposed. Utility Model Content

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A replaceable conductive dual-probe vortex flow meter includes a meter body. A first piezoelectric sensor module is connected through the side of the meter body. The first piezoelectric sensor module includes a cross tooth. A pressure relief protective sleeve and a screw are fixedly connected sequentially from the outside to the inside along the axis of the cross tooth. A retaining tooth and a sensor are fixedly connected sequentially from the outside to the inside along the axis of the screw. A threaded sleeve is threadedly connected to the outside of the screw. A torque disk is rotatably connected to the bottom of the threaded sleeve. A spring is sleeved on the outside of the torque disk. A sealing door is fixedly connected to the bottom of the torque disk. A sealing chamber is rotatably connected to the bottom of the sealing door through a rotating shaft.

[0010] Preferably, a capillary tube is connected in parallel to the side of the watch body, a wire tube is fixedly connected to the side of the capillary tube, a miniature piezoelectric sensor module is connected through the side of the capillary tube, and a second vortex generator is fixedly connected inside the capillary tube.

[0011] Preferably, a first vortex generator is fixedly connected inside the watch body, flange rings are fixedly connected to both sides of the watch body, a sealing rod is fixedly connected to the side of the watch body, and a digital display is fixedly connected to the top of the sealing rod.

[0012] Preferably, there are two locking teeth, which are evenly distributed in a circumferential array. The top of the torque disk has two slots, which are also evenly distributed in a circumferential array. The width of the slots is adapted to the width of the locking teeth.

[0013] Preferably, a slot is provided on the side of the watch body, the top of the slot is fixedly connected to one end of the spring, and the other end of the spring is fixedly connected to the side of the torque disc.

[0014] Preferably, one end of the conduit is fixedly connected to the side of the sealing rod.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. A parallel capillary design is adopted. In this branch, vortex generators and pressure sensors are installed with the same diameter reduction ratio. Based on Bernoulli's equation and the principle of pressure drop consistency in parallel pipelines, the medium density is calculated and inverted in real time by measuring the fluid differential pressure and vortex frequency signal. The real-time mass flow rate is displayed on the digital display through system calculation.

[0017] 2. By designing a switchable and sealable chamber structure, the piezoelectric sensor can be replaced and maintained online under pressure without affecting the process fluid transport in the main pipeline, ensuring the continuous operation and high availability of the system for measurement. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a replaceable conductive dual-probe vortex flowmeter proposed in this utility model.

[0019] Figure 2 This is a cross-sectional view of a replaceable conductive dual-probe vortex flow meter proposed in this utility model.

[0020] Figure 3 An exploded view of the body of a replaceable conductive dual-probe vortex flowmeter proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of a replaceable conductive dual-probe vortex flowmeter piezoelectric sensor module proposed in this utility model;

[0022] Figure 5 An exploded view of a replaceable conductive dual-probe vortex flowmeter piezoelectric sensor module proposed in this utility model;

[0023] Figure 6 This is a schematic diagram of the capillary structure of a replaceable conductive dual-probe vortex flowmeter proposed in this utility model.

[0024] Figure 7 This is an exploded view of the capillary of a replaceable conductive dual-probe vortex flowmeter proposed in this utility model.

[0025] In the diagram: 1. Body; 11. Flange ring; 12. Capillary tube; 121. Conductor tube; 122. Second vortex generator; 13. Sealing rod; 14. Digital display; 15. First vortex generator; 2. First piezoelectric sensor module; 21. Cross teeth; 211. Pressure relief sleeve; 22. Screw; 221. Clamping teeth; 23. Torque disc; 231. Spring; 232. Sealing door; 24. Threaded sleeve; 25. Sealing chamber; 3. Miniature piezoelectric sensor module. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-7A replaceable conductive dual-probe vortex flow meter includes a body 1. A first piezoelectric sensor module 2 is connected through the side of the body 1. The first piezoelectric sensor module 2 includes a cross tooth 21. A pressure relief protective sleeve 211 and a screw 22 are fixedly connected sequentially from the outside to the inside along the axis at the bottom of the cross tooth 21. A retaining tooth 221 and a sensor are fixedly connected sequentially from the outside to the inside along the axis at the bottom of the screw 22. There are two retaining teeth 221, which are evenly distributed in a circumferential array. Two slots are opened on the top of the torque disk 23, which are evenly distributed in a circumferential array. The width of the slots is adapted to the width of the retaining teeth 221.

[0028] A threaded sleeve 24 is threadedly connected to the outside of the screw 22. A torque disk 23 is rotatably connected to the bottom of the threaded sleeve 24. A spring 231 is sleeved on the outside of the torque disk 23. A sealing door 232 is fixedly connected to the bottom of the torque disk 23. A sealing chamber 25 is rotatably connected to the bottom of the sealing door 232 via a rotating shaft. A first vortex generator 15 is fixedly connected inside the meter body 1. Flange rings 11 are fixedly connected to both sides of the meter body 1. A sealing rod 13 is fixedly connected to the side of the meter body 1. A digital display 14 is fixedly connected to the top of the sealing rod 13.

[0029] It should be noted that when each vortex generated by the vortex generator detaches from the fluid-blocking side, it will cause a small, regular change in the local pressure on that side (instantaneous pressure difference). When the pressure sensor module is subjected to mechanical stress (pressure or deformation), an electric charge (voltage) proportional to the magnitude of the stress will be generated at its two ends. After signal processing, the voltage is uploaded to the system.

[0030] Using the above technical solution, the device is installed on the pipeline according to the arrow on the side of the meter body 1 by using the flange rings 11 on both sides and screws. When the device is in a resonant state for a long time, the alternating stress will cause fatigue failure of the piezoelectric sensing element, and may also cause the internal connecting parts to loosen or the structure to be damaged. Therefore, the piezoelectric sensor module needs to be replaced and maintained regularly.

[0031] When the first piezoelectric sensor module 2 needs to be replaced, use a special cross-tooth tool to rotate the cross teeth 21 counterclockwise, causing the screw 22 and the sensor to move upward. At this time, the torque disk 23 located at the bottom of the screw 22 will rotate counterclockwise due to the deformation force of the spring 231 and the movement of the retaining teeth 221 at the bottom of the screw 22. At the same time, it will drive the sealing door 232 to rotate slowly. When the cross teeth 21 rotates 90°, the rotation of the torque disk 23 ends. The force generated by the deformation of the spring 231 will keep the sealing chamber 25 and the sealing door 232 in a sealed state. Continue to rotate the cross teeth 21. During this process, because the pressure inside the sealing chamber 25 is greater than the atmospheric pressure, the fluid inside the chamber will spray downward along the pressure relief protective sleeve 211. Continue to rotate the cross teeth 21 to remove the first piezoelectric sensor module 2 and replace the bottom sensor. This realizes the online replacement and maintenance of the piezoelectric sensor under pressure, ensuring the high availability of continuous system operation and measurement.

[0032] Specifically, a capillary tube 12 is connected in parallel to the side of the meter body 1 via a bypass. A wire tube 121 is fixedly connected to the side of the capillary tube 12. A miniature piezoelectric sensor module 3 is connected through the side of the capillary tube 12. A second vortex generator 122 is fixedly connected inside the capillary tube 12. A slot is opened on the side of the meter body 1. One end of the spring 231 is fixedly connected to the top of the slot. The other end of the spring 231 is fixedly connected to the side of the torque disk 23. One end of the wire tube 121 is fixedly connected to the side of the sealing rod 13.

[0033] It should be noted that the structure of the miniature piezoelectric sensor module 3 is a scaled-down version of the first piezoelectric sensor module 2. Based on the inverse relationship between the vortex generation frequency and the diameter of the vortex generator in the Karman vortex street phenomenon in fluid mechanics, the diameter of the second vortex generator 122 in the capillary 2 is reduced. Even if the fluid velocity is insufficient to form after the first vortex generator 2, a vortex can still be formed after the reduced diameter second vortex generator 122, enabling the miniature piezoelectric sensor module 3 to accurately measure the flow velocity.

[0034] Through the above technical solution, a capillary tube 12 is provided on the side of the body 1, utilizing Bernoulli's principle and the basic principle of fluid mechanics, "P + 1 / 2ρv". 2 Based on the principle that "+ρgh=constant" and "hf1=hf2" are equal to the pressure drop (resistance loss) of each branch pipe, the medium density is calculated and inverted in real time by measuring the fluid differential pressure and vortex frequency signal. The real-time mass flow rate is calculated and displayed on the digital display instrument 14 by the system. This not only increases the fluid velocity measurement range, but also changes the calculation method from the data perspective for data comparison.

[0035] Working principle:

[0036] When in use, the device is installed on the pipeline according to the arrow on the side of the meter body 1 using the flange rings 11 on both sides and screws. When the sensor needs to be replaced or maintained, the cross teeth 21 are rotated counterclockwise using a special cross tool, which drives the screw 22 and the sensor to move upward. At this time, the torque disk 23 located at the bottom of the screw 22 will rotate counterclockwise due to the deformation force of the spring 231 and the movement of the locking teeth 221 at the bottom of the screw 22, which at the same time drives the sealing door 232 to rotate slowly.

[0037] Based on the above, when the cross teeth 21 rotates 90°, the torque disk 23 stops rotating. The force generated by the deformation of the spring 231 keeps the sealing chamber 25 and the sealing door 232 in a sealed state. As the cross teeth 21 continue to rotate, the pressure inside the sealing chamber 25 is greater than atmospheric pressure. At this time, the fluid inside the chamber will spray downwards along the pressure relief sleeve 211. Continuing to rotate the cross teeth 21 removes the first piezoelectric sensor module 2 and replaces the bottom sensor.

[0038] Based on the above, after the replacement is completed, the screw 22 is aligned with the threaded sleeve 24 and the cross teeth 21 are rotated clockwise. When the cross teeth 21 rotate to the specified degree, the bottom tooth 221 of the screw 22 contacts the top groove of the torque disk 23, causing the torque disk 23 and the sealing door 232 to rotate clockwise against the reaction force of the spring 231. After rotating 90° again, the sensor replacement is completed. This enables the online replacement and maintenance of the first piezoelectric sensor module 2 and the miniature piezoelectric sensor module 3 under pressure, ensuring the continuous operation and high availability of the system for measurement.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A replaceable conductive dual-probe vortex flow meter, comprising a meter body (1), characterized in that, The first piezoelectric sensor module (2) is connected through the side of the body (1). The first piezoelectric sensor module (2) includes a cross tooth (21). The bottom of the cross tooth (21) is fixedly connected to a pressure relief protective sleeve (211) and a screw (22) from the outside to the inside along the axis. The bottom of the screw (22) is fixedly connected to a locking tooth (221) and a sensor from the outside to the inside along the axis. The outside of the screw (22) is threadedly connected to a threaded sleeve (24). The bottom of the threaded sleeve (24) is rotatably connected to a torque disk (23). The outside of the torque disk (23) is fitted with a spring (231). The bottom of the torque disk (23) is fixedly connected to a sealing door (232). The bottom of the sealing door (232) is rotatably connected to a sealing chamber (25) through a rotating shaft.

2. The replaceable conductive dual-probe vortex flowmeter according to claim 1, characterized in that, A capillary tube (12) is connected in parallel to the side of the body (1), a wire tube (121) is fixedly connected to the side of the capillary tube (12), a miniature piezoelectric sensor module (3) is connected through the side of the capillary tube (12), and a second vortex generator (122) is fixedly connected inside the capillary tube (12).

3. The replaceable conductive dual-probe vortex flowmeter according to claim 1, characterized in that, The first vortex generator (15) is fixedly connected inside the body (1), and flange rings (11) are fixedly connected to both sides of the body (1). A sealing rod (13) is fixedly connected to the side of the body (1), and a digital display (14) is fixedly connected to the top of the sealing rod (13).

4. A replaceable conductive dual-probe vortex flow meter according to claim 2, characterized in that, Two teeth (221) are provided, and the two teeth (221) are evenly distributed in a circumferential array. Two slots are opened on the top of the torque disk (23), and the two slots are evenly distributed in a circumferential array. The width of the slots is adapted to the width of the teeth (221).

5. A replaceable conductive dual-probe vortex flowmeter according to claim 1, characterized in that, The side of the watch body (1) has a slot, the top of the slot is fixedly connected to one end of the spring (231), and the other end of the spring (231) is fixedly connected to the side of the torque disk (23).

6. A replaceable conductive dual-probe vortex flowmeter according to claim 2, characterized in that, One end of the conduit (121) is fixedly connected to the side of the sealing rod (13).

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