Vortex shedding flowmeter based on Venturi tube

Abstract

The invention discloses a vortex shedding flowmeter based on a Venturi tube, and relates to the technical field of flowmeters, the vortex shedding flowmeter comprises a detection tube, a detection probe is arranged in the detection tube, a vortex shedding generator is arranged on one side, close to an input tube, of the detection probe, and a rectifier is arranged between the input tube and the detection tube; an anti-vibration circuit and an anti-vibration probe are arranged in the detection probe, and the detection tube is made by integral precision casting; fluid flows into the detection pipe through the input pipe, after flowing into the detection pipe, the fluid firstly passes through the rectifier, the problem that a traditional flowmeter needs a long straight pipe section is solved by arranging the rectifier, then the fluid is conveyed to the side close to the vortex street generator, and then the fluid generates vortex under the action of the vortex street generator; and the detection probe detects the flow of the fluid in the detection pipe immediately, and finally the detected fluid is output to the output pipe through the detection pipe.

Description

Technical Field

[0001] The invention relates to the technical field of flowmeters, in particular to a vortex flowmeter based on a venturi tube. Background Art

[0002] Flow measurement is one of the components of metrology science and technology, and it is closely related to the national economy and scientific research. Doing this work well plays an important role in ensuring product quality, improving production efficiency, and promoting the development of science and technology. Especially in today's era of energy crisis and increasing automation of industrial production, the status and role of flow meters in the national economy are more obvious;

[0003] Currently, the vortex flowmeters on the market all use straight tubes as measuring tubes. In actual applications, the flow rate is often near the lower limit of measurement or even far below the lower limit of measurement. In many usage scenarios, users do not accept the reduction in diameter. At this time, the vortex flowmeter with the original caliber cannot measure or measure out of tolerance. Summary of the invention

[0004] The object of the present invention is to provide a vortex flowmeter based on a venturi tube to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A vortex flowmeter based on a venturi tube comprises a detection tube, an input tube and an output tube are respectively arranged on both sides of the detection tube, the detection tube is flange-connected to the input tube and the output tube respectively, a detection probe is arranged in the detection tube, a vortex generator is arranged on the side of the detection probe close to the input tube, and a rectifier is arranged between the input tube and the detection tube.

[0007] The fluid flows into the detection tube through the input pipe. After the fluid flows into the detection tube, it first passes through the rectifier. The rectifier is set to solve the problem that the traditional flow meter requires a long straight pipe section. Then the fluid is transported to the side close to the vortex generator. Then the fluid generates a vortex under the action of the vortex generator. The detection probe then detects the flow of the fluid in the detection tube. Finally, the detected fluid is output to the output tube through the detection tube.

[0008] Preferably, an anti-vibration circuit and an anti-vibration probe are provided in the detection probe.

[0009] By combining the anti-vibration circuit and the anti-vibration probe, both software and hardware anti-vibration are achieved, reducing external vibration interference during low flow rate measurement, improving the detection accuracy of the flow meter, and coordinating with the neck position in the detection tube to further improve the stability and accuracy of vortex low flow rate measurement.

[0010] Preferably, the detection tube is a Venturi tube, and the detection tube is made of one-piece precision casting.

[0011] The problem of large pressure loss of traditional vortex flowmeters due to diameter change is solved by processing the inside of the vortex measuring tube into a Venturi structure. At the same time, the problem of traditional vortex flowmeters requiring diameter change when the flow velocity is lower than the lower limit of measurement is solved. The problem of traditional vortex flowmeters requiring welding and complex processing is solved through one-piece precision casting. The use of one-piece precision cast detection tube achieves the effect of reducing manufacturing costs and time, while improving assembly accuracy. The design of the Venturi tube enables the vortex flowmeter to adapt to the measurement conditions of large diameter and small flow.

[0012] Preferably, a temperature sensor is provided in the detection tube, the vortex generator consists of a fixed block and two movable plates, baffles are provided at both ends of the movable plate close to the fixed block, the fixed block is connected to the detection tube through a base, the two movable plates are symmetrically arranged on both sides of the fixed block, a movable rod is provided on the side of the movable plate away from the detection probe, the movable plate is slidably connected to the fixed block through the movable rod, a plurality of rotating cavities are provided in the fixed block, a rotating rod is provided in the rotating cavity, an extension plate is provided on the rotating rod, a torsion spring is provided on the rotating rod, the rotating rod is rotatably connected to the rotating cavity through the torsion spring, one end of the extension plate is wrapped around the rotating rod, the other end of the extension plate is connected to the baffle on the movable plate, and the extension plate is made of flexible metal material.

[0013] Preferably, a power cavity is provided in the fixed block, a worm is provided in the power cavity, the worm is driven by a micro motor, a turbine is provided on the side of the worm away from the micro motor, the worm is meshed with the turbine, and the turbine is rotationally connected to the power cavity.

[0014] Preferably, active rods are symmetrically arranged on both sides of the turbine, a sliding groove is arranged on one side of the power chamber close to the movable plate, a sliding rod is arranged in the sliding groove, one side of the sliding rod is meshed with the active rod for transmission, and the other side of the sliding rod is connected to the movable plate.

[0015] Preferably, placement grooves are provided on the flanges on both sides of the detection tube, gaskets are provided in the placement grooves, inflatable cushions are symmetrically provided on both sides of the gaskets, a connecting port is provided in the gaskets, and the two inflatable cushions are connected through the connecting port.

[0016] Preferably, a plurality of delivery tubes are provided in the inner wall of the detection tube, and the plurality of delivery tubes are arranged around the axis of the detection tube, and air delivery rings are provided between the delivery tubes, and the delivery tubes are connected with an inflatable cushion, and a temperature sensing block is provided in one of the delivery tubes, and one side of the temperature sensing block forms a smooth plane with the inner wall of the detection tube, and the other side of the temperature sensing block is located in the delivery tube, and the temperature sensing block is made of memory metal.

[0017] Preferably, a gas delivery port is provided on one of the delivery pipes, a gas tank is provided on the side of the gas delivery port away from the delivery pipe, the gas tank is connected to the delivery pipe through the gas delivery port, and the gas tank is used to pump gas.

[0018] Preferably, a flow channel is provided inside the rectifier, a plurality of spray holes are provided on a side of the rectifier close to the vortex generator, the flow channel is connected to the inflatable cushion through a pipeline, and a deflation valve is provided in the flow channel.

[0019] The fluid flows through the input pipe to the rectifier, and is transported to the detection tube through the rectifier. When the detected fluid is in a high temperature state, due to the influence of high temperature and the fact that the vortex generator is made of metal, the vortex generator will expand due to heat, which will cause the vortex generated when the fluid flows through the vortex generator to be different from the vortex generated when it is not expanded, thus causing the deviation of the flow meter detection accuracy;

[0020] During the high-temperature fluid transportation process, the temperature sensor in the detection tube converts the temperature signal in the detection tube into an electrical signal and transmits it to the controller. The controller then controls the micromotor to drive. The drive shaft of the micromotor drives the worm to rotate. The worm rotates and meshes with the turbine. The turbine rotates and drives the two active rods to rotate. The active rods mesh with the sliding rods during rotation, so that the sliding rods move along the axis of the sliding groove. The sliding rods then move to the side close to the power chamber, and then the sliding rods pull the moving plate to move when they move. The side of the moving plate close to the detection probe moves to the side close to the fixed block. The moving plate drives the baffle to move when it moves, and the extension plate is pushed to move during the movement of the baffle. At this time, the rotating rod loses the tension of the extension plate, that is, the tension of the extension plate is less than the torsion of the torsion spring on the rotating rod, and then the torsion spring drives the rotating rod to reset and rotate. During the rotation of the rotating rod, the extension plate is driven to shrink and wrap, and then the extension plate is recovered. At this time, there will be no groove between the baffle on the moving plate and the fixed block to interfere with the flow of the fluid, so that the distance between the moving plate and the inner wall of the detection tube after movement is the same as the distance between the vortex generator and the inner wall of the detection tube when the vortex generator is not expanded, thereby achieving a compensation effect for the vortex generator; at the same time, affected by high temperature, the flanges of the detection tube, the input pipe and the output pipe will also expand due to heat, and the two flanges are squeezed against each other. Since a gasket is provided between the two flanges, and an inflatable cushion is provided on the side of the gasket close to the flange, during the process of the two flanges squeezing each other, the inflatable cushion is squeezed first, and the inflatable cushion is deformed after being squeezed, squeezing the space in the placement groove, so that the connection between the two flanges is further squeezed and sealed;

[0021] When the temperature of the fluid transported in the pipeline is low, the low temperature is transmitted to the vortex generator and the flange, causing the vortex generator and the flange to shrink and deform, and then the micro motor drives the worm to reverse, and the worm reverses and drives the turbine to reverse, and then the turbine reverses and drives the active rod to rotate in the opposite direction, so that the sliding rod moves along the sliding groove to the side away from the power chamber, and then the sliding rod pushes the moving plate to move, and the moving plate moves to the side away from the fixed block. When the moving plate moves, it drives the baffle to move, and the baffle moves and pulls the extension plate to move. At this time, the pulling force of the extension plate is greater than the torsion of the torsion spring on the rotating rod, and then the extension plate is extended. The plate drives the rotating rod to rotate, and then moves the extension plate to the side close to the moving plate, and then the extension plate fills the gap between the baffle plate on the moving plate and the fixed block, so that the side edge of the baffle plate on the moving plate, the side edge of the fixed block and the extension plate form a complete vertical plane, so that there is no groove between the baffle plate on the moving plate and the fixed block to interfere with the flow of the fluid, so that the distance between the moving plate and the inner wall of the detection tube after movement is the same as the distance between the vortex generator and the inner wall of the detection tube when the vortex generator is not contracted, so that the vortex generator is always in the best vortex generation state, further improving the detection accuracy of the flow meter;

[0022] Affected by the low-temperature fluid, since the temperature sensing block is made of memory metal, the temperature sensing block shrinks when it is cold. After the temperature sensing block shrinks and moves when it is cold, the temperature sensing block is separated from the delivery pipe, and then the gas in the gas tank is delivered to the delivery pipe through the gas delivery port, and then delivered to the inflatable cushion through the delivery pipe. At this time, the air release valve in the inflatable cushion is in a closed state. Due to the continuous input of the rear gas in the inflatable cushion, the inflatable cushion expands. The expanded inflatable cushion squeezes the inner wall of the placement groove, and further uses the expansion of the inflatable cushion to fill the gap between the two flanges, and further seals the gap between the two flanges, thereby preventing the fluid in the pipeline from leaking directly from the two flanges;

[0023] When the viscosity of the fluid transported in the pipeline is relatively high, after the fluid flow detection is completed, part of the fluid may adhere to the inner wall of the pipeline due to the effect of viscosity. At this time, the air release valve in the flow channel is opened, so that the gas in the inflatable cushion is transported to the flow channel through the air release valve, and then transported to the spray hole through the flow channel, and finally sprayed out through the spray hole to the inner wall of the detection tube. The sprayed gas pushes the fluid adhering to the inner wall of the pipeline to be output to the output pipe, so that the inner wall of the detection tube is cleaned, avoiding the fluid adhering to the inner wall of the detection tube, which causes interference to the detection of the flow meter during subsequent flow detection, thereby improving the detection accuracy of the flow meter.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] By combining anti-vibration circuits and anti-vibration probes, dual anti-vibration of software and hardware is achieved, reducing external vibration interference during low flow rate measurements, improving the detection accuracy of the flowmeter, and coordinating with the neck position in the detection tube to further improve the stability and accuracy of vortex low flow rate measurements; by processing the vortex measurement tube into a Venturi structure, the problem of large pressure loss due to diameter change in the traditional vortex is solved, and at the same time, the problem of the traditional vortex flow rate being required to change diameter when it is lower than the measurement lower limit is solved; through one-piece precision casting, the problem of traditional vortex flowmeters requiring welding and complex processing is solved; the use of an integrated precision cast detection tube achieves the effect of reducing manufacturing costs and time, and at the same time improves the accuracy of assembly; the design of the Venturi tube enables the vortex flowmeter to adapt to the measurement conditions of large diameter and small flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the present invention;

[0027] Figure 2 It is a front view of the present invention;

[0028] Figure 3 is a side view of the present invention;

[0029] Figure 4 It is a schematic diagram of the internal structure of the present invention;

[0030] Figure 5 It is an internal front view of the present invention;

[0031] Figure 6 for Figure 4 The enlarged view of point A in the middle;

[0032] Figure 7 Schematic diagram of the internal structure of the vortex generator;

[0033] Figure 8 This is the internal top view of the vortex generator;

[0034] In the figure: 1. detection tube; 11. input tube; 12. output tube; 13. rectifier; 131. flow channel; 14. placement groove; 15. gasket; 16. inflatable cushion; 17. delivery tube; 18. temperature sensing block; 19. gas tank; 2. detection probe;

[0035] 3. Vortex generator; 31. Fixed block; 311. Rotating rod; 312. Extension plate; 32. Moving plate; 33. Power chamber; 34. Worm; 35. Turbine; 36. Active rod; 37. Sliding rod. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example: Figure 1-Figure 8 As shown, the present invention provides a technical solution of a vortex flowmeter based on a venturi tube, comprising a detection tube 1, wherein an input tube 11 and an output tube 12 are respectively arranged on both sides of the detection tube 1, and the detection tube 1 is flange-connected with the input tube 11 and the output tube 12 respectively, and a detection probe 2 is arranged in the detection tube 1, and a vortex generator 3 is arranged on the side of the detection probe 2 close to the input tube 11, and a rectifier 13 is arranged between the input tube 11 and the detection tube 1; an anti-vibration circuit and an anti-vibration probe are arranged in the detection probe 2; the detection tube 1 is a venturi tube, and the detection tube 1 is made of one-piece precision casting.

[0038] As a specific embodiment of the present invention, a placement groove 14 is provided on the flange plates on both sides of the detection tube 1, a gasket 15 is provided in the placement groove 14, and an inflatable cushion 16 is symmetrically provided on both sides of the gasket 15. A connecting port is provided in the gasket 15, and the two inflatable cushions 16 are connected through the connecting port.

[0039] As a specific embodiment of the present invention, a plurality of delivery pipes 17 are arranged in the inner wall of the detection tube 1, and the plurality of delivery pipes 17 are arranged around the axis of the detection tube 1, and an air delivery ring is arranged between the delivery pipes 17, and the delivery pipes 17 are connected to the inflatable cushion 16, and a temperature sensing block 18 is arranged in one of the delivery pipes 17, and one side of the temperature sensing block 18 forms a smooth plane with the inner wall of the detection tube 1, and the other side of the temperature sensing block 18 is located in the delivery pipe 17, and the temperature sensing block 18 is made of memory metal.

[0040] As a specific embodiment of the present invention, a gas delivery port is provided on one of the delivery pipes 17, and a gas tank 19 is provided on the side of the gas delivery port away from the delivery pipe 17. The gas tank 19 is connected to the delivery pipe 17 through the gas delivery port, and the gas tank 19 is used to pump gas.

[0041] As a specific embodiment of the present invention, a flow channel 131 is arranged inside the rectifier 13, and a plurality of spray holes are arranged on the side of the rectifier 13 close to the vortex generator 3. The flow channel 131 is connected to the inflatable cushion 16 through a pipeline, and a deflation valve is arranged inside the flow channel 131.

[0042] As a specific embodiment of the present invention, a temperature sensor is arranged in the detection tube 1, and the vortex generator 3 is composed of a fixed block 31 and two movable plates 32. Baffles are arranged at both ends of the movable plate 32 close to the fixed block 31. The fixed block 31 is connected to the detection tube 1 through a base. The two movable plates 32 are symmetrically arranged on both sides of the fixed block 31. A movable rod is arranged on the side of the movable plate 32 away from the detection probe 2. The movable plate 32 is slidably connected to the fixed block 31 through the movable rod. A plurality of rotating cavities are arranged in the fixed block 31, and a rotating rod 311 is arranged in the rotating cavity. An extension plate 312 is arranged on the rotating rod 311, and a torsion spring is arranged on the rotating rod 311. The rotating rod 311 is rotatably connected to the rotating cavity through the torsion spring. One end of the extension plate 312 is wrapped around the rotating rod 311, and the other end of the extension plate 312 is connected to the baffle on the movable plate 32. The extension plate 312 is made of flexible metal material.

[0043] As a specific embodiment of the present invention, a power chamber 33 is provided in the fixed block 31, and a worm 34 is provided in the power chamber 33. The worm 34 is driven by a micro motor, and a turbine 35 is provided on the side of the worm 34 away from the micro motor. The worm 34 is meshed with the turbine 35, and the turbine 35 is rotationally connected to the power chamber 33.

[0044] As a specific embodiment of the present invention, active rods 36 are symmetrically arranged on both sides of the turbine 35, a sliding groove is arranged on the side of the power chamber 33 close to the movable plate 32, a sliding rod 37 is arranged in the sliding groove, one side of the sliding rod 37 is meshed with the active rod 36 for transmission, and the other side of the sliding rod 37 is connected to the movable plate 32.

[0045] Working principle of the present invention:

[0046] The fluid flows through the input pipe 11 to the rectifier 13, and is transported to the detection tube 1 through the rectifier 13. When the detected fluid is in a high temperature state, due to the influence of the high temperature and the fact that the vortex generator 3 is made of metal, the vortex generator 3 will expand due to the heat, and the vortex generated when the fluid flows through the vortex generator 3 will be different from the vortex generated when the fluid is not expanded, thereby causing a deviation in the detection accuracy of the flow meter;

[0047] During the high-temperature fluid transportation process, the temperature sensor in the detection tube 1 converts the temperature signal in the detection tube 1 into an electrical signal and transmits it to the controller. The controller then controls the micromotor to drive, and the drive shaft of the micromotor drives the worm 34 to rotate. When the worm 34 rotates, it engages with the turbine 35. When the turbine 35 rotates, it drives the two active rods 36 to rotate. During the rotation of the active rod 36, it engages with the sliding rod 37, so that the sliding rod 37 moves along the axis of the sliding groove. The sliding rod 37 then moves to the side close to the power chamber 33, and then the sliding rod 37 pulls the moving plate 32 to move when it moves. The side of the moving plate 32 close to the detection probe 2 moves to the side close to the fixed block 31, and the moving plate 32 drives the baffle to move when it moves. During the movement of the baffle, the extension plate 311 is pushed to move. At this time, the rotating rod 311 loses the tension of the extension plate 312, that is, the tension of the extension plate 312 is less than the torsion of the torsion spring on the rotating rod 311, and then the torsion spring drives the rotating rod 311 is reset and rotated. During the rotation of the rotating rod 311, the extension plate 312 is driven to shrink and wrap, and then the extension plate 312 is recovered. At this time, there is no groove between the baffle on the movable plate 32 and the fixed block 31 to interfere with the flow of the fluid, so that the distance between the movable plate 32 and the inner wall of the detection tube 1 after the movement is the same as the distance between the vortex generator 3 and the inner wall of the detection tube 1 when the vortex generator 3 is not expanded, thereby achieving the compensation effect of the vortex generator 3; at the same time, affected by the high temperature, the flanges of the detection tube 1, the input pipe 11 and the output pipe 12 will also expand due to the heat, and the two flanges are squeezed against each other. Since a gasket 15 is provided between the two flanges, and an inflatable cushion 16 is provided on the side of the gasket 15 close to the flange, during the process of the two flanges squeezing each other, the inflatable cushion 16 is squeezed first, and the inflatable cushion 16 is deformed after being squeezed, and the space in the placement groove 14 is squeezed, so that the connection between the two flanges is further squeezed and sealed;

[0048] When the temperature of the fluid transported in the pipeline is low, the low temperature is transmitted to the vortex generator 3 and the flange, causing the vortex generator 3 and the flange to shrink and deform, and then the micro motor drives the worm 34 to reverse, and the worm 34 reverses and drives the turbine 35 to reverse, and then the turbine 35 reverses and drives the active rod 36 to rotate in the opposite direction, so that the sliding rod 37 moves along the sliding groove to the side away from the power chamber 33, and then the sliding rod 37 pushes the moving plate 32 to move, and the moving plate 32 moves to the side away from the fixed block 31. When the moving plate 32 moves, it drives the baffle to move, and during the movement of the baffle, it pulls the extension plate 311 to move. At this time, the pulling force of the extension plate 312 is greater than the torsion spring on the rotating rod 311. Torsion, and then the extension plate 312 drives the rotating rod 311 to rotate, and then the extension plate 312 moves to the side close to the movable plate 32, and then the extension plate 312 fills the gap between the baffle plate on the movable plate 32 and the fixed block 31, so that the side edge of the baffle plate on the movable plate 32, the side edge of the fixed block 31 and the extension plate form a complete vertical plane, so that there is no groove between the baffle plate on the movable plate 32 and the fixed block 31 to interfere with the flow of the fluid, so that the distance between the movable plate 32 and the inner wall of the detection tube 1 after movement is the same as the distance between the vortex generator 3 and the inner wall of the detection tube 1 when the vortex generator 3 is not contracted, so that the vortex generator 3 is always in the best vortex generation state;

[0049] Affected by the low-temperature fluid, since the temperature sensing block 18 is made of memory metal, the temperature sensing block 18 contracts when it is cooled. After the temperature sensing block 18 contracts and moves when it is cooled, the temperature sensing block 18 is separated from the delivery pipe 17, and then the gas in the gas tank 19 is delivered to the delivery pipe 17 through the gas delivery port, and then delivered to the inflatable cushion 16 through the delivery pipe 17. At this time, the air release valve in the inflatable cushion 16 is in a closed state. Due to the continuous input of the rear gas in the inflatable cushion 16, the inflatable cushion 16 expands. The expanded inflatable cushion 16 squeezes the inner wall of the placement groove 14, and further uses the expansion of the inflatable cushion 16 to fill the gap between the two flanges, and further seals the gap between the two flanges, thereby preventing the fluid in the pipeline from leaking directly from the two flanges.

[0050] When the viscosity of the fluid transported in the pipeline is relatively high, after the fluid flow detection is completed, part of the fluid may adhere to the inner wall of the pipeline due to the effect of viscosity. At this time, the air release valve in the flow channel 131 is opened, so that the gas in the inflatable cushion 16 is transported to the flow channel 131 through the air release valve, and then transported to the spray hole through the flow channel 131, and finally sprayed out through the spray hole to the inner wall of the detection tube 1, and the sprayed gas pushes the fluid adhering to the inner wall of the pipeline to be output to the output pipe 12, so that the inner wall of the detection tube 1 is cleaned, thereby avoiding the fluid adhering to the inner wall of the detection tube 1, which causes interference to the detection of the flow meter during subsequent flow detection.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A vortex flowmeter based on a venturi tube, characterized in that: The invention comprises a detection tube (1), wherein an input tube (11) and an output tube (12) are respectively arranged on both sides of the detection tube (1), the detection tube (1) is flange-connected to the input tube (11) and the output tube (12), a detection probe (2) is arranged inside the detection tube (1), a vortex generator (3) is arranged on the side of the detection probe (2) close to the input tube (11), and a rectifier (13) is arranged between the input tube (11) and the detection tube (1).

2. A vortex flowmeter based on a venturi tube according to claim 1, characterized in that: The detection probe (2) is provided with an anti-vibration circuit and an anti-vibration probe.

3. A vortex flowmeter based on a venturi tube according to claim 1, characterized in that: The detection tube (1) is a Venturi tube, and the detection tube (1) is made by integral precision casting.

4. A vortex flowmeter based on a venturi tube according to claim 1, characterized in that: The detection tube (1) is provided with a temperature sensor. The vortex generator (3) is composed of a fixed block (31) and two movable plates (32). Baffles are provided at both ends of the movable plates (32) close to the fixed block (31). The fixed block (31) and the detection tube (1) are connected via a base. The two movable plates (32) are symmetrically arranged on both sides of the fixed block (31). A movable rod is provided on the side of the movable plate (32) away from the detection probe (2). The movable plate (32) is connected to the fixed block (31) via the movable rod. 1) Sliding connection, the fixed block (31) is provided with a plurality of rotating cavities, a rotating rod (311) is provided in the rotating cavity, an extension plate (312) is provided on the rotating rod (311), a torsion spring is provided on the rotating rod (311), the rotating rod (311) is rotatably connected to the rotating cavity through the torsion spring, one end of the extension plate (312) is wound around the rotating rod (311), the other end of the extension plate (312) is connected to the movable plate (32), and the extension plate (312) is made of a flexible metal material.

5. A vortex flowmeter based on a venturi tube according to claim 4, characterized in that: A power chamber (33) is arranged in the fixed block (31), a worm (34) is arranged in the power chamber (33), the worm (34) is driven by a micro motor, a turbine (35) is arranged on a side of the worm (34) away from the micro motor, the worm (34) is meshed with the turbine (35), and the turbine (35) is rotationally connected to the power chamber (33).

6. A vortex flowmeter based on a venturi tube according to claim 5, characterized in that: Active rods (36) are symmetrically arranged on both sides of the turbine (35); a sliding groove is arranged on one side of the power chamber (33) close to the movable plate (32); a sliding rod (37) is arranged in the sliding groove; one side of the sliding rod (37) is meshed with the active rod (36) for transmission, and the other side of the sliding rod (37) is connected to a baffle on the movable plate (32).

7. A vortex flowmeter based on a venturi tube according to claim 1, characterized in that: The flanges on both sides of the detection tube (1) are provided with placement grooves (14), gaskets (15) are provided in the placement grooves (14), and inflatable cushions (16) are symmetrically provided on both sides of the gasket (15), and a connecting port is provided in the gasket (15), and the two inflatable cushions (16) are connected through the connecting port.

8. A vortex flowmeter based on a Venturi tube according to claim 7, characterized in that: A plurality of delivery pipes (17) are arranged in the inner wall of the detection tube (1). The plurality of delivery pipes (17) are arranged around the axis of the detection tube (1). An air delivery ring is arranged between the delivery pipes (17). The delivery pipes (17) are connected to the inflatable cushion (16). A temperature sensing block (18) is arranged in one of the delivery pipes (17). One side of the temperature sensing block (18) forms a smooth plane with the inner wall of the detection tube (1), and the other side of the temperature sensing block (18) is located in the delivery pipe (17). The temperature sensing block (18) is made of memory metal.

9. A vortex flowmeter based on a Venturi tube according to claim 8, characterized in that: A gas delivery port is provided on one of the delivery pipes (17), and a gas tank (19) is provided on a side of the gas delivery port away from the delivery pipe (17). The gas tank (19) is connected to the delivery pipe (17) via the gas delivery port, and the gas tank (19) is used to pump gas.

10. A vortex flowmeter based on a venturi tube according to claim 8, characterized in that: A flow channel (131) is provided inside the rectifier (13), a plurality of spray holes are provided on a side of the rectifier (13) close to the vortex generator (3), the flow channel (131) is connected to the inflatable cushion (16) through a pipeline, and a deflation valve is provided inside the flow channel (131).

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