A multi-stage vortex suppression high-precision long-diameter nozzle flowmeter

Abstract

The present invention discloses a multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter, which belongs to the technical field of flowmeters and includes: a first pipe and a second pipe, the first pipe and the second pipe are movably connected by a telescopic tube, and the first pipe and the second pipe are correspondingly connected to a vortex generator and a contraction end at one end away from the telescopic tube; a support and adjustment mechanism, the support and adjustment mechanism includes electric slide rails placed on both sides of a base plate, the electric slide rails are movably connected to electric sliders, the electric sliders are fixedly connected to a first support rod placed at the bottom of the first pipe and the second pipe by a crossbeam, and the extended end at the center of the bottom of the crossbeam is connected to a slide groove along the length direction of the base plate. The present invention can solve the technical problem that when the installation pipe is connected to other pipes, it cannot be adjusted in position accordingly, which affects the stability of the support, and there is often a large size difference, which leads to inaccurate numerical values ​​of the flow in the measured pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of flow meters, and in particular relates to a multi-stage vortex suppression type high-precision long-diameter nozzle flow meter. Background Art

[0002] A nozzle flowmeter is a differential pressure generator used to measure flow. It can be used with various differential pressure gauges or transmitters to measure the flow of various fluids in pipelines. Standard nozzle throttling devices, when used in conjunction with differential pressure transmitters, can measure the flow of liquids, steam, and gases.

[0003] Compared with orifice flowmeters, nozzle flowmeters have smaller pressure loss, thus saving energy. They are more durable and suitable for high-temperature and high-pressure fluids. They are widely used in steam flow measurement in the power, chemical and other industries.

[0004] The main features of nozzle flowmeters include: High precision and stability: The nozzle flowmeter adopts a standardized geometric structure, the flow coefficient is less affected by the fluid properties, and it has excellent long-term stability and high precision. High-pressure and high-temperature resistance: The nozzle structure is sturdy and can withstand pressures up to 42MPa and temperatures of 650°C, making it suitable for extreme environments such as power plant steam and chemical reactors.

[0005] During the installation of the flowmeter, when the mounting pipe is connected to other pipes, the support mechanism on the pipe is fixed and cannot be adjusted accordingly, which affects the stability of the support. There are often large size differences, so when the fluid passes through the pipe and the mounting pipe, the fluid velocity is uneven, which will cause large signal fluctuations, and thus lead to inaccurate flow values ​​in the measured pipe. In addition, in a low temperature environment, not only will the density and viscosity of the fluid increase, thereby reducing the flow rate and affecting the accuracy of the flow measurement, but it may also cause the performance of the sensor inside the flowmeter to decline, thereby affecting the overall measurement accuracy of the flowmeter. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter to solve the technical problem that when the installation pipe is connected to other pipelines, the support mechanism on the pipeline is fixed and cannot be adjusted accordingly, which affects the stability of the support. In addition, there are often large size differences, and the uneven fluid velocity will cause large signal fluctuations, which in turn leads to inaccurate numerical values ​​of the flow in the measured pipeline.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter, comprising:

[0009] a first pipe and a second pipe, wherein the first pipe and the second pipe are movably connected via a telescopic tube, and the ends of the first pipe and the second pipe away from the telescopic tube are respectively connected to a vortex generator and a contraction end;

[0010] A support adjustment mechanism, the support adjustment mechanism comprising electric slide rails disposed on both sides of the base plate, the electric slide rails being movably connected to electric sliders, the electric sliders being fixedly connected to a first support rod disposed at the bottom of the first pipe and the second pipe via a crossbeam, an extended end at the center of the bottom of the crossbeam being connected to a slide groove along the length direction of the base plate, and one end of the crossbeam being connected to a first gear plate extending into the interior of the cover body;

[0011] The cover body is fixedly connected to the base plate, and one end of the first gear plate is engaged with the second gear plate through rotating gears. The first gear plate and the second gear plate are vertically staggered, and the top of the second gear plate is installed with a second support rod placed at the bottom of the telescopic tube through a U-shaped rod.

[0012] Furthermore, the first support rod and the second support rod are both arranged in an arc shape, the bottom of the second gear plate is movably connected to the hollow sleeve through a lifting block, the lifting block and the bottom of the inner wall of the sleeve are connected by a first spring, the lifting blocks are symmetrically arranged relative to the center of the cover body, and the lifting blocks are connected by a pressure plate, the bottom of the pressure plate is connected to a piston through a resistance rod, and a downwardly concave rubber bowl is fixedly installed on the piston, the rubber bowl is connected to a slide groove along the height direction of the air cylinder, and one end of the air cylinder is connected to an elastic protection component through a conduit.

[0013] Furthermore, the elastic protection component includes an elastic airbag placed on the catheter, an active cavity is formed between the elastic airbag and the pressure plate, and a pressure relief valve adapted to the elastic airbag is connected to the elastic airbag, the bottom of the rubber bowl is connected to a conical portion by a threaded connection, and the outer wall edge of the conical portion is provided with a resistance surface connected to the air cylinder.

[0014] Furthermore, an I-shaped block is installed on the inner wall of the cover body, and limiting grooves connected to the extended end of the first gear plate are opened on both sides of the I-shaped block.

[0015] Furthermore, it also includes a flow regulating mechanism placed on the first pipe, the flow regulating mechanism includes a rotating shaft movably connected to the box body, one end of the rotating shaft is fixedly connected to a rotating handle, and the other end is connected to a screw shaft extending to the inside of the box body, and a guide block is spirally transmitted on the screw shaft, and the bending rods at both ends of the guide block pass through the first pipe and extend to the baffle.

[0016] Furthermore, a closed area is formed between the baffle plate and the guide groove on the first pipe, and the two ends of the baffle plate and the push block are connected by a swing rod. One end of the push block passes through the first pipe and extends to the movable frame, and one end of the movable frame passes through the battery box and extends to the power supply component.

[0017] Furthermore, both sides of the swing arm are mounted on the baffle and the push block by a rotational connection, the power supply assembly includes a fixed rod fixed on the mobile frame, the fixed rod and the inner wall of the battery box are connected by a second spring, and one end of the fixed rod is connected to a conical plug rod extending to the gap between the battery pack, the battery pack is mounted on an annular preheater by an electrical connection, the annular preheater is distributed on the outer wall of the connecting pipe on the vortex generator, and the extension section at the bottom of the battery box is connected to a guide groove along the length direction of the bottom plate.

[0018] Furthermore, the first pipe and the vortex generator, as well as the second pipe and the contraction end, are connected via mounting flanges, and the electric slide rail is arranged in a T-shape on the bottom plate.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] In the present invention, to adapt the length of the pipe to the external pipe, when the first and second pipes align and move closer together, the entire pipe length is shortened, eliminating the need for additional connectors for support and fixation. The pipes drive the synchronous movement of the crossbeam, which enables the first gear plates at both ends to align and move. Under the meshing transmission of the gears, the second gear plate drives the second support rod downward, thereby reducing and adjusting the pipe length. Furthermore, the downward movement of the second support rod prevents interference between the pipes. During the downward movement of the first gear plate, a first spring and an elastic protection assembly are provided. The unidirectional movement of gas inflates the elastic airbag, thereby exerting a reverse force on the downward pressure plate. This prevents the support assembly from exerting a large impact force on the interior of the housing due to its own weight during its downward movement. Conversely, during the outward movement of the first and second pipes, the telescopic tube leaks out of the pipe, thereby increasing the pipe length. During the upward movement of the second support rod, it provides good support and fixation with the telescopic tube, effectively helping to achieve an effective support connection for the flowmeter. The provision of the support assembly allows for adaptive support connection for pipes of different sizes, thereby improving the operational stability of the device.

[0021] In the present invention, the support components are all arranged in an arc shape, which effectively improves the stability of the support by expanding the contact surface, avoids the occurrence of overload, and disperses the force. In conjunction with the electric slider on the electric slide rail, it can drive the first pipe and the second pipe to quickly separate or close, so that the length of the pipe can be adaptively adjusted. In addition, the positioning column on the first pipe cooperates with the corresponding positioning groove on the second pipe to help the pipes to be accurately docked, prevent position deviation, and have strong safety.

[0022] In the present invention, in a low-temperature environment, due to the increase in the viscosity of the fluid, the viscosity of the fluid can be reduced by increasing the size of the guide groove. Therefore, the handle is manually rotated, and the handle drives the rotation of the screw shaft. Under the action of the spiral transmission, the guide block drives the baffle to move downward, thereby expanding the flow area of ​​the guide groove. Under the rotation connection of the swing rod, the pushing blocks at both ends allow the conical plug rod to be pulled out of the battery pack, and the battery packs are connected and powered by the annular heater, thereby heating the front end of the pipeline. By increasing the temperature, the fluid can flow normally, thereby ensuring the accurate measurement value of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the structure of a multi-stage vortex suppression high-precision long-diameter nozzle flowmeter of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of a multi-stage vortex suppression high-precision long-diameter nozzle flowmeter of the present invention. Figure 2 ;

[0026] Figure 3 This is a front view of a multi-stage vortex suppression type high-precision long-diameter nozzle flow rate of the present invention;

[0027] Figure 4 It is a cross-sectional schematic diagram of a local direction of a multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter of the present invention;

[0028] Figure 5 It is a schematic diagram of the interior of the cover body of the present invention;

[0029] Figure 6 This invention Figure 5A magnified view of point A;

[0030] Figure 7 It is a structural schematic diagram of the rubber bowl of the present invention;

[0031] Figure 8 This is a schematic diagram of the connection between the shielding plate and the pushing block of the present invention;

[0032] Figure 9 It is a schematic diagram of the interior of the battery box of the present invention.

[0033] Figure numerals: 1, first pipe; 2, second pipe; 3, telescopic pipe; 4, vortex generator; 5, contraction end; 6, support adjustment mechanism; 7, electric slide rail; 8, electric slider; 9, first support rod; 10, cover; 11, first gear plate; 12, rotating gear; 13, second gear plate; 14, U-shaped rod; 15, second support rod; 16, lifting block; 17, sleeve; 18, first spring; 19, pressure plate; 20, contact rod; 21, piston; 22, rubber bowl; 23, air cylinder; 24, elastic 1. Safety protection component; 25. Elastic airbag; 26. Pressure relief valve; 27. Conical part; 28. Contact surface; 29. ​​I-shaped block; 30. Limiting groove; 31. Flow regulating mechanism; 32. Box body; 33. Rotating shaft; 34. Rotating handle; 35. Screw shaft; 36. Guide block; 37. Shielding plate; 38. Pushing block; 39. Swinging rod; 40. Moving frame; 41. Battery box; 42. Power supply component; 43. Fixed rod; 44. Second spring; 45. Battery pack; 46. Conical plug rod; 47. Annular preheater. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0035] Reference Manual Figure 1 —Attachment Figure 9 As shown, a multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter includes: a first pipe 1 and a second pipe 2, the first pipe 1 and the second pipe 2 are movably connected by a telescopic tube 3, and the first pipe 1 and the second pipe 2 are respectively connected to a vortex generator 4 and a contraction end 5 at one end away from the telescopic tube 3.

[0036] The support and adjustment mechanism 6 includes electric slide rails 7 placed on both sides of the base plate, and the electric slide rails 7 are movably connected to the electric sliders 8. The electric sliders 8 are fixedly connected to the first support rod 9 placed at the bottom of the first pipe 1 and the second pipe 2 through a cross beam. The extending end at the center of the bottom of the cross beam is connected to a slide groove along the length direction of the base plate, and one end of the cross beam is connected to the first gear plate 11 extending to the inside of the cover body 10.

[0037] The cover body 10 is fixedly connected to the base plate, and one end of the first gear plate 11 is meshed with the second gear plate 13 through the rotating teeth 12. The first gear plate 11 and the second gear plate 13 are vertically staggered, and the top of the second gear plate 13 is installed with a second support rod 15 placed at the bottom of the telescopic tube 3 through a U-shaped rod 14.

[0038] Specifically, the vertical staggered arrangement between the above-mentioned gear plates can prevent interference during the movement of the transmission parts, thereby ensuring the normal movement of the transmission parts. In the process of converting the horizontal movement of the beam into vertical movement, the second support rod 15 and the telescopic tube 3 conflict with or separate from each other. When the beam moves in the center, it means that the length of the pipeline is shortened, and the second gear plate 13 drives the second support rod 15 to move downward. When the beam moves outward, it means that the length of the pipeline is expanded, and the second gear plate 13 drives the second support rod 15 to move upward, thereby ensuring the stability of the device connection by adding support components.

[0039] By extension, the second gear plate 13 connected to the U-shaped rod 14 on the second support rod 15 can be a separate independent design, that is, the second gear plate 13 is connected to a corresponding second support rod 15, so that even if a gear part is damaged, it will not affect the normal movement of the transmission part.

[0040] In addition, the vortex generator 4 is set on the pipeline. The main function of the vortex generator 4 in the flowmeter is to generate vortices in the fluid and convert these vortices into electrical pulse signals. Its function is to generate regular vortices alternately from both sides when the medium passes through. These vortices can be captured by the detection element and converted into electrical signals for flow measurement.

[0041] Specifically, the first support rod 9 and the second support rod 15 are both arranged in an arc shape, and the bottom of the second gear plate 13 is movably connected to the hollow sleeve 17 through the lifting block 16. The lifting block 16 and the bottom of the inner wall of the sleeve 17 are connected by a first spring 18. The lifting blocks 16 are symmetrically arranged relative to the center of the cover body 10, and the lifting blocks 16 are connected by a pressure plate 19. The bottom of the pressure plate 19 is connected to a piston 21 through a resistance rod 20. A downwardly concave rubber bowl 22 is fixedly installed on the piston 21. The rubber bowl 22 is connected to a slide groove along the height direction of the air cylinder 23, and one end of the air cylinder 23 is connected to an elastic protection component 24 through a conduit.

[0042] The elastic protection component 24 includes an elastic airbag 25 placed on the catheter, and an active cavity is formed between the elastic airbag 25 and the pressure plate 19, and the elastic airbag 25 is connected to a pressure relief valve 26 adapted thereto. The bottom of the rubber bowl 22 is connected to a conical portion 27 by a threaded connection, and the outer wall edge of the conical portion 27 is provided with a contact surface 28 connected to the air cylinder 23. An I-shaped block 29 is installed on the inner wall of the cover body 10, and both sides of the I-shaped block 29 are provided with a limiting groove 30 connected to the extended end of the first gear plate 11.

[0043] Specifically, the limiting groove 30 on the I-shaped block 29 has a limiting and guiding effect on the movement of the second gear plate 13, thereby allowing the I-shaped block 29 to move on the corresponding track, thereby having a better positioning effect on the movement of the second gear plate 13.

[0044] In order to adapt the length of the pipeline to the external pipeline, when the first pipeline 1 and the second pipeline 2 move toward the center, it means that the length of the entire pipeline is shortened, so there is no need for more connecting parts to achieve support and fixation. The pipeline drives the synchronous movement of the crossbeam, and the crossbeam can make the first gear plates 11 at both ends move toward the center. Under the meshing transmission of the gears, the second gear plate 13 drives the second support rod 15 to move downward, and can reduce the length of the pipeline. In addition, the second support rod 15 can avoid the interference movement between the pipelines during the downward movement. During the downward movement of the first gear plate 11, a first spring 18 and an elastic protection component 24 are provided. By means of unidirectional movement of gas, the elastic airbag 25 can be inflated to provide a reverse force push protection for the downward pressure plate 19, which can prevent the support component from bringing a large impact pressure to the inside of the cover body 10 due to its own weight during the falling process. On the contrary, during the outward movement of the first pipe 1 and the second pipe 2, the telescopic tube 3 leaks out of the pipe, and the length of the pipe is also lengthened. During the upward movement of the second support rod 15, it can achieve better support and fixation with the telescopic tube 3, which can effectively help the flow meter to achieve an effective support connection. Through the setting of the support component, adaptive support connection can be achieved for pipes of different sizes, thereby improving the stability of the device operation.

[0045] The up-and-down motion of piston 21 and the sealing effect of rubber cup 22 enable the intake and compression of air. A gap exists between piston 21 and the sidewall of cylinder 23. Piston 21 is equipped with a downwardly concave rubber cup 22. When piston 21 is pulled upward, the volume of air below piston 21 increases, reducing its pressure. This causes the air above piston 21 to flow downward from around rubber cup 22. Conversely, when piston 21 is pressed downward, the volume of air below piston 21 decreases, increasing its pressure, forcing rubber cup 22 into contact with the cylinder wall, preventing air from leaking above piston 21.

[0046] The gap between the piston 21 and the side wall of the cylinder 23 and the downwardly concave rubber bowl 22 constitute a one-way valve structure. The up and down movement of the piston 21 causes the air volume to change, and the pressure also changes accordingly. The rubber bowl 22 plays a sealing role, preventing air from leaking into the top of the piston 21. The one-way valve structure prevents gas backflow. In addition, the present invention adds a downwardly extending contact surface 28 of the conical portion 27. When the air flow moves downward, it can flow downward through the gap between the contact surface 28 and the side wall of the cylinder 23 and enter the elastic airbag 25. When the piston 21 is pressed downward, the air volume below the piston 21 decreases and the pressure increases, so that the contact surface 28 is tightly attached to the side wall of the cylinder 23 by expanding the contact surface, which can play a secondary protection role for the one-way valve structure, thereby further avoiding the occurrence of gas backflow.

[0047] The elastic airbag 25 provides a reverse force to the pressure plate 19 between the lifting blocks 16 by expanding, which can play an effective buffering and protective effect. Moreover, unlike the elastic airbag 25 that returns the transmission mechanism to its position through its own elastic recovery effect, due to the rapid elastic change speed, when the pressure plate 19 has not yet come into contact with the elastic airbag 25, the elastic airbag 25 itself becomes the original static state, and thus cannot play an effective protective role for the pressure plate 19. The one-way valve structure cooperates with the pressure relief valve 26 to allow the elastic airbag 25 to be in an expanded state for a period of time, thereby leaving time for contact and adhesion with the pressure plate 19. Under the elastic buffering action of the first spring 18, the safety of the device is further improved.

[0048] The support components are all arranged in an arc shape, which effectively improves the stability of the support by expanding the contact surface, avoids overload, and disperses the force. In conjunction with the electric slider 8 on the electric slide rail 7, it can drive the first pipe 1 and the second pipe 2 to quickly separate or close, so that the length of the pipe can be adaptively adjusted. In addition, the positioning column on the first pipe 1 cooperates with the corresponding positioning groove on the second pipe 2 to help the pipes to be accurately docked, prevent position deviation, and have strong safety.

[0049] A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter also includes a flow regulating mechanism 31 placed on the first pipe 1. The flow regulating mechanism 31 includes a rotating shaft 33 movably connected to the box body 32. One end of the rotating shaft 33 is fixedly connected to a rotating handle 34, and the other end is connected to a screw shaft 35 extending to the interior of the box body 32. A guide block 36 is spirally driven on the screw shaft 35. The bending rods at both ends of the guide block 36 pass through the first pipe 1 and extend to the baffle 37.

[0050] Specifically, a closed area is formed between the baffle plate 37 and the guide groove on the first pipe 1. The two ends of the baffle plate 37 and the push block 38 are connected by a swing rod 39. One end of the push block 38 passes through the first pipe 1 and extends to the movable frame 40. One end of the movable frame 40 passes through the battery box 41 and extends to the power supply component 42.

[0051] Both sides of the swing arm 39 are mounted on the baffle plate 37 and the push block 38 by a rotational connection. The power supply assembly 42 includes a fixed rod 43 fixed on the mobile frame 40. The fixed rod 43 and the inner wall of the battery box 41 are connected by a second spring 44, and one end of the fixed rod 43 is connected to a conical plug rod 46 extending to the gap of the battery pack 45. The battery pack 45 is mounted on the annular preheater 47 by an electrical connection. The annular preheater 47 is distributed on the outer wall of the connecting pipe on the vortex generator 4, and the extension section at the bottom of the battery box 41 is connected with a guide groove along the length direction of the bottom plate. The first pipe 1 and the vortex generator 4 and the second pipe 2 and the contraction end 5 are connected by mounting flanges, and the electric slide rail 7 is arranged in a T-shape on the bottom plate. The shape design of the above-mentioned electric slide rail 7 can also allow the pipe to maintain a corresponding stability effect during movement, and the movement position accuracy is high.

[0052] In a low-temperature environment, due to the increase in the viscosity of the fluid, the viscosity of the fluid can be reduced by increasing the size of the guide groove. Therefore, the handle 34 is manually rotated, and the handle 34 drives the rotation of the screw shaft 35. Under the action of the spiral transmission, the guide block 36 drives the baffle 37 to move downward, thereby expanding the flow area of ​​the guide groove. Under the rotation connection of the swing rod 39, the push blocks 38 at both ends allow the conical plug 46 to be pulled out of the battery pack 45, and the battery packs 45 are connected and powered by the annular preheater 47, thereby heating the front end of the pipeline. By increasing the temperature, the fluid can flow normally, thereby ensuring the accurate measurement value of the flow meter.

[0053] The above are only preferred specific embodiments 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.

[0054] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter, characterized in that: include: A first pipe (1) and a second pipe (2), wherein the first pipe (1) and the second pipe (2) are movably connected via a telescopic pipe (3), and the ends of the first pipe (1) and the second pipe (2) away from the telescopic pipe (3) are respectively connected to a vortex generator (4) and a contraction end (5); A support and adjustment mechanism (6), the support and adjustment mechanism (6) comprising electric slide rails (7) disposed on both sides of a base plate, the electric slide rails (7) being movably connected to electric sliders (8), the electric sliders (8) being fixedly connected to first support rods (9) disposed at the bottoms of the first pipe (1) and the second pipe (2) via a crossbeam, an extended end at the center of the bottom of the crossbeam being connected to a slide groove along the length direction of the base plate, and one end of the crossbeam being connected to a first gear plate (11) extending into the interior of the cover body (10); The cover body (10) is fixedly connected to the bottom plate, and one end of the first gear plate (11) is meshed with the second gear plate (13) through the rotating teeth (12), the first gear plate (11) and the second gear plate (13) are vertically staggered, and the top end of the second gear plate (13) is mounted with a second support rod (15) placed at the bottom of the telescopic tube (3) through a U-shaped rod (14); The flow regulating mechanism (31) is placed on the first pipe (1), and the flow regulating mechanism (31) includes a rotating shaft (33) movably connected to the box body (32), one end of the rotating shaft (33) is fixedly connected to a rotating handle (34), and the other end is connected to a screw shaft (35) extending into the interior of the box body (32), and a guide block (36) is spirally driven on the screw shaft (35), and the bending rods at both ends of the guide block (36) penetrate the first pipe (1) and extend to the shielding plate (37); A closed area is formed between the shielding plate (37) and the guide groove on the first pipe (1); both ends of the shielding plate (37) and the push block (38) are connected via a swing rod (39); one end of the push block (38) passes through the first pipe (1) and extends to the movable frame (40); and one end of the movable frame (40) passes through the battery box (41) and extends to the power supply assembly (42); Both sides of the swing rod (39) are mounted on the shielding plate (37) and the pushing block (38) by means of a rotational connection. The power supply assembly (42) includes a fixed rod (43) fixed on the movable frame (40). The fixed rod (43) and the inner wall of the battery box (41) are connected by a second spring (44). One end of the fixed rod (43) is connected to a conical plug rod (46) extending to the gap of the battery pack (45). The battery pack (45) is mounted on an annular preheater (47) by means of an electrical connection. The annular preheater (47) is distributed on the outer wall of the connecting pipe on the vortex generator (4), and the extension section at the bottom of the battery box (41) is connected to a guide groove along the length direction of the bottom plate.

2. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 1, characterized in that: The first support rod (9) and the second support rod (15) are both arranged in an arc shape. The bottom of the second gear plate (13) is movably connected to the hollow sleeve (17) through a lifting block (16). The lifting block (16) and the bottom of the inner wall of the sleeve (17) are connected by a first spring (18). The lifting blocks (16) are symmetrically arranged relative to the center of the cover body (10), and the lifting blocks (16) are connected by a pressure plate (19). The bottom of the pressure plate (19) is connected to a piston (21) through a resistance rod (20). A downwardly concave rubber bowl (22) is fixedly installed on the piston (21). The rubber bowl (22) is connected to a slide groove along the height direction of the air cylinder (23), and one end of the air cylinder (23) is connected to an elastic protection component (24) through a conduit.

3. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 2, characterized in that: The elastic protection component (24) includes an elastic airbag (25) placed on the catheter, an active cavity is formed between the elastic airbag (25) and the pressure plate (19), and a pressure relief valve (26) adapted thereto is connected to the elastic airbag (25), the bottom of the rubber bowl (22) is connected to a tapered portion (27) by a threaded connection, and an outer wall edge of the tapered portion (27) is provided with a contact surface (28) connected to the air cylinder (23).

4. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 2, characterized in that: An I-shaped block (29) is mounted on the inner wall of the cover body (10), and both sides of the I-shaped block (29) are provided with limiting grooves (30) connected to the extended end of the first gear plate (11).

5. The multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 1, characterized in that: The first pipe (1) and the vortex generator (4), as well as the second pipe (2) and the contraction end (5), are connected via mounting flanges, and the electric slide rail (7) is arranged in a T-shape on the bottom plate.

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