Multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter

Abstract

The invention discloses a multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter, which belongs to the technical field of flowmeters and comprises a first pipeline and a second pipeline, the first pipeline and the second pipeline are movably connected through a telescopic pipe, and one ends, far away from the telescopic pipe, of the first pipeline and the second pipeline are correspondingly connected with a vortex generator and a contraction end; and the supporting adjusting mechanism comprises electric sliding rails arranged on the two sides of the bottom plate, electric sliding blocks are movably connected to the electric sliding rails, the electric sliding blocks are fixedly connected to first supporting rods arranged at the bottoms of the first pipeline and the second pipeline through a cross beam, and the extending end of the center of the bottom of the cross beam is connected with a sliding groove in the length direction of the bottom plate. The technical problems that when a mounting pipe is connected with other pipelines, position adjustment cannot be carried out along with the mounting pipe, the supporting stability is affected, the situation that the size difference is large often exists, and then the numerical value of the flow in the measured pipeline is inaccurate can be solved.

Description

Technical Field

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

[0002] A nozzle flow meter is a differential pressure generating device for measuring flow rate, and can measure the flow rate of various fluids in a pipeline in cooperation with various differential pressure gauges or differential pressure transmitters. The standard nozzle throttling device is used in conjunction with a differential pressure transmitter to measure the flow rate of liquids, steam, and gases.

[0003] Compared with an orifice flow meter, the nozzle flow meter has a smaller pressure loss, thus saving energy, being relatively durable, suitable for high-temperature and high-pressure fluids, and is widely used in the steam flow measurement in industries such as electric power and chemical industry.

[0004] The main characteristics of the nozzle flow meter include: high precision and stability: The nozzle flow meter adopts a standardized geometric structure, the flow coefficient is less affected by the fluid properties, has excellent long-term stability and high precision; high pressure and high temperature resistance performance: The nozzle structure is firm and can withstand a pressure of up to 42 MPa and a temperature of 650 °C, suitable for extreme environments such as power plant steam and chemical reaction kettles.

[0005] During the installation process of the flow meter, when the installation pipe is connected to other pipelines, the support mechanism on the pipeline is fixedly arranged and cannot be adjusted accordingly, which affects the stability of the support, and there are often large size differences. Therefore, when the fluid passes through the pipeline and the installation pipe, the uneven fluid velocity will cause large signal fluctuations, and then lead to inaccurate numerical values of the flow rate measured in the pipeline. In addition, in a low-temperature environment, it will not only increase the density and viscosity of the fluid, thereby reducing the flow velocity and affecting the accuracy of flow measurement, but also may cause a decline in the performance of the internal sensor of the flow meter, thus affecting the overall measurement accuracy of the flow meter. Summary of the Invention

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

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions: A multi-stage vortex suppression type high-precision long-orifice nozzle flow meter, comprising: A first pipeline and a second pipeline, which are movably connected by an expansion pipe between the first pipeline and the second pipeline, and a vortex generator and a contraction end are correspondingly connected to one end of the first pipeline and the second pipeline away from the expansion pipe; A support adjustment mechanism, the support adjustment mechanism includes electric slide rails arranged on both sides of the bottom plate, electric sliders are movably connected on the electric slide rails, and the electric sliders are fixedly connected by a cross beam to a first support rod arranged at the bottom of the first pipeline and the second pipeline. An extension end at the center of the bottom of the cross beam is connected with a chute along the length direction of the bottom plate, and one end of the cross beam is connected with a first gear plate extending into the interior of the cover body; The cover body is fixedly connected to the bottom plate, and one end of the first gear plate is meshed and driven by a rotating tooth with a second gear plate. The first gear plate and the second gear plate are vertically and staggeredly arranged, and the top end of the second gear plate is installed with a second support rod arranged at the bottom of the expansion pipe through a U-shaped rod.

[0008] Furthermore, both the first support rod and the second support rod are arc-shaped. The bottom of the second gear plate is movably connected to a hollow sleeve through a lifting block. A first spring is connected between the lifting block and the bottom of the inner wall of the sleeve. The lifting blocks are symmetrically arranged with respect to the center of the cover body, and the lifting blocks are connected by a pressing plate. A piston is connected to the bottom of the pressing plate through a resisting rod. A rubber bowl that is recessed downward is fixedly installed on the piston. The rubber bowl is connected with a chute along the height direction of the air cylinder, and one end of the air cylinder is connected with an elastic protection component through a conduit.

[0009] Furthermore, the elastic protection component includes an elastic air bag arranged on the conduit. An activity cavity is formed between the elastic air bag and the pressing plate, and a pressure relief valve adapted to it is connected to the elastic air bag. The bottom of the rubber bowl is connected with a conical part by a threaded connection method, and a resisting surface connected to the air cylinder is arranged on the outer wall edge of the conical part.

[0010] Furthermore, an I-shaped block is installed on the inner wall of the cover body, and limiting grooves connected to the extension end of the first gear plate are opened on both sides of the I-shaped block.

[0011] Furthermore, a flow rate adjustment mechanism is also included and is arranged on the first pipeline. The flow rate adjustment mechanism includes a rotating shaft movably connected to a box body. One end of the rotating shaft is fixedly connected with a rotating handle, and the other end is connected with a lead screw shaft extending into the interior of the box body. A guide block is helically driven on the lead screw shaft, and the bent rods at both ends of the guide block penetrate through the first pipeline and extend to a baffle plate.

[0012] Furthermore, a closed area is formed between the baffle plate and the diversion groove on the first pipeline. Swing rods are connected between both ends of the baffle plate and a pushing block. One end of the pushing block penetrates through the first pipeline and extends to a moving frame, and one end of the moving frame penetrates through a battery box and extends to a power supply component.

[0013] Further, both sides of the swing rod are installed on the baffle plate and the push block by means of rotational connection. The power supply assembly includes a fixed rod fixed on the moving 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 with a tapered plug rod extending to the gap between the battery packs. The battery packs are installed on the outer wall of the communicating pipe on the vortex generator through electrical connection, and the extension section at the bottom of the battery box is connected with a guide groove along the length direction of the bottom plate.

[0014] Further, both between the first pipe and the vortex generator and between the second pipe and the contraction end are connected by mounting flanges, and the electric slide rail is arranged in a T shape on the bottom plate.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: In the present invention, in order to adaptively adjust the length dimension of the pipeline to the external pipeline, when the first pipe and the second pipe move towards the center and approach each other, it means that the overall length of the pipeline is shortened, and then fewer connecting parts are required to achieve support and fixation. The pipeline drives the synchronous movement of the cross beam. The cross beam can make the first gear plates at both ends move towards the center. Under the meshing drive of the gears, the second gear plate drives the second support rod to move downward, and the length of the pipeline can be reduced and adjusted. Moreover, during the downward movement of the second support rod, the contact movement between the pipelines can be avoided. During the downward movement of the first gear plate, a first spring and an elastic protection assembly are provided. Through the one-way movement of gas, the elastic airbag can be inflated to exert a reverse acting force on the downward pressing plate for protection, so as to avoid a large impact force on the inside of the cover body when the support assembly falls due to its own weight. On the contrary, when the first pipe and the second pipe move outward, the telescopic pipe leaks out of the pipeline, and the length of the pipeline also becomes longer. During the upward movement of the second support rod, good support and fixation with the telescopic pipe can be achieved, which can effectively help the flowmeter to achieve effective support connection. Through the setting of the support assembly, adaptive support connection for pipelines of different sizes can be realized, improving the stability of the device operation.

[0016] In the present invention, the support assemblies are all arranged in an arc shape. By expanding the contact surface, the stability of the support is effectively improved, avoiding the situation of overloading of the force, so that the acting force can be dispersed. Cooperating 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 as to adaptively adjust the length of the pipeline. In addition, the positioning posts on the first pipe cooperate with the corresponding positioning grooves on the second pipe, which can help the pipelines to accurately dock and prevent the situation of position deviation, with strong safety.

[0017] In the present invention, in a low-temperature environment, due to the increase in the viscosity of the fluid, at this time, by increasing the diversion groove, the viscosity of the fluid is reduced. Therefore, manually rotate the handle, and the handle drives the rotation of the lead screw shaft. Under the action of screw drive, the guide block drives the downward movement of the shielding plate, thereby expanding the flow area of the diversion groove. Under the rotational connection of the swing rod, the push blocks at both ends cause the conical plug to be pulled out of the battery pack, enabling the battery packs to be connected and supplying power to the annular heater, thereby heating the front end of the pipeline. By increasing the temperature, the fluid can flow normally, thus ensuring the accurate measurement value of the flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic structural diagram of a multi-stage vortex suppression type high-precision long diameter nozzle flowmeter of the present invention Figure 1 ; Figure 2 is a schematic structural diagram of a multi-stage vortex suppression type high-precision long diameter nozzle flowmeter of the present invention Figure 2 ; Figure 3 is a front view of a multi-stage vortex suppression type high-precision long diameter nozzle flow of the present invention; Figure 4 is a schematic sectional view of a local direction of a multi-stage vortex suppression type high-precision long diameter nozzle flowmeter of the present invention; Figure 5 is a schematic internal view of the housing of the present invention; Figure 6 is the present invention Figure 5 enlarged view of part A; Figure 7 is a schematic structural diagram of the rubber cup of the present invention; Figure 8 is a schematic connection diagram of the shielding plate and the push block of the present invention; Figure 9 is a schematic internal view of the battery box of the present invention.

[0020] Figure numerals: 1, first pipeline; 2, second pipeline; 3, telescopic tube; 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, resistance rod; 21, piston; 22, rubber bowl; 23, air cylinder; 24, elastic 1. The invention relates to a protective component; 25. an elastic airbag; 26. a pressure relief valve; 27. a conical portion; 28. a contact surface; 29. an I-shaped block; 30. a limiting groove; 31. a flow regulating mechanism; 32. a box body; 33. a rotating shaft; 34. a rotating handle; 35. a screw shaft; 36. a guide block; 37. a baffle plate; 38. a pushing block; 39. a swing rod; 40. a moving frame; 41. a battery box; 42. a power supply component; 43. a fixing rod; 44. a second spring; 45. a battery pack; 46. a conical plug rod; 47. a ring preheater. DETAILED DESCRIPTION

[0021] 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.

[0022] Reference Manual Attached Figure 1 —Attachment Figure 9 As shown, a multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter includes: a first pipeline 1 and a second pipeline 2, the first pipeline 1 and the second pipeline 2 are movably connected via a telescopic tube 3, and the first pipeline 1 and the second pipeline 2 are correspondingly connected with a vortex generating body 4 and a contraction end 5 at one end away from the telescopic tube 3.

[0023] The support and adjustment mechanism 6 includes electric slide rails 7 arranged on both sides of the base plate, and electric sliders 8 are movably connected to the electric slide rails 7. The electric sliders 8 are fixedly connected to the first support rod 9 arranged at the bottom of the first pipe 1 and the second pipe 2 through a cross beam. The extended end at the center of the bottom of the cross beam is connected with 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.

[0024] 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.

[0025] Specifically, the vertical staggered arrangement between the above-mentioned gear plates can prevent interference between the transmission parts during the movement, 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 are caused to conflict with or separate from each other. When the beam moves in the center, it means that the length of the pipeline is reduced, 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 increasing the support assembly.

[0026] 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.

[0027] 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.

[0028] Specifically, 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 recessed rubber bowl 22 is fixedly mounted 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.

[0029] 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 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 limit grooves 30 connected to the extended end of the first gear plate 11.

[0030] 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 , so that the I-shaped block 29 can move on the corresponding track, thereby having a better positioning effect on the movement of the second gear plate 13 .

[0031] In order to adaptively adjust the length dimension of the pipeline to the external pipeline, when the first pipeline 1 and the second pipeline 2 move towards each other in alignment, it means that the overall pipeline length is shortening, and thus fewer connecting pieces are required to achieve support and fixation. The pipeline drives the synchronous movement of the crossbeam. The crossbeam enables the first gear plates 11 at both ends to move in alignment. Under the meshing drive of the gears, the second gear plate 13 drives the second support rod 15 to move downward, and the pipeline length can be adjusted to shrink. Moreover, during the downward movement of the second support rod 15, the contact movement between the pipelines can be avoided. 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 the unidirectional movement of gas, the elastic airbag 25 can be inflated to exert a reverse acting force to push and protect the downward pressing plate 19. In this way, it is possible to prevent the support component from causing a large impact force inside the cover body 10 during the process of falling due to its own weight. On the contrary, during the outward movement of the first pipeline 1 and the second pipeline 2, the telescopic pipe 3 leaks out from the pipeline, and the pipeline length also becomes longer accordingly. During the upward movement of the second support rod 15, a good support and fixation with the telescopic pipe 3 can be achieved, which can effectively help the flowmeter to achieve effective support connection. By setting the support component, adaptive support connections for pipelines of different sizes can be realized, improving the stability of the device operation.

[0032] The up and down movement of the piston 21 and the sealing effect of the rubber cup 22 are used to achieve the inhalation and compression of air. There is a gap between the piston 21 of the air cylinder 23 and the side wall of the air cylinder 23. A downward concave rubber cup 22 is equipped on the piston 21. When the piston 21 is pulled upward, the air volume below the piston 21 increases and the pressure decreases, causing the air above the piston 21 to flow from around the rubber cup 22 to the lower part. When the piston 21 is pressed downward, the air volume below the piston 21 decreases and the pressure increases, causing the rubber cup 22 to closely adhere to the cylinder wall to prevent air from leaking into the upper part of the piston 21.

[0033] The gap between the piston 21 and the side wall of the air cylinder 23 and the downward concave rubber cup 22 form a check valve structure. The up and down movement of the piston 21 causes the air volume to change and the pressure to change accordingly. The rubber cup 22 plays a sealing role to prevent air from leaking into the upper part of the piston 21. The check valve structure avoids gas backflow. In addition, in the present invention, a contact surface 28 extending downward from the conical portion 27 is added. When the air flow moves downward, it can flow downward through the gap between the contact surface 28 and the side wall of the air 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, causing the contact surface 28 to closely adhere to the side wall of the air cylinder 23 by expanding the contact surface, which can play a secondary protection role for the check valve structure, thereby further preventing the occurrence of gas backflow.

[0034] The elastic airbag 25 provides a reverse acting force on the pressure plate 19 between the lifting blocks 16 by expanding, which can achieve an effective buffering and protection effect. Different from the elastic airbag 25 returning to its original position through its own elastic recovery, since the elastic change speed is relatively fast, when the pressure plate 19 has not yet contacted the elastic airbag 25, the elastic airbag 25 itself has already returned to its original static state, thus unable to effectively protect the pressure plate 19. The one-way valve structure cooperates with the pressure relief valve 26, enabling the elastic airbag 25 to be in an expanded state for a period of time, thereby leaving time for contact and fitting with the pressure plate 19. Under the elastic buffering effect of the first spring 18, the safety of the device is further improved.

[0035] The support components are all arranged in an arc shape. By expanding the contact surface, the stability of the support is effectively improved, avoiding the situation of overloading of the force, so that the acting force can be dispersed. Cooperating 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, thereby adaptively adjusting the length of the pipe. In addition, the positioning posts on the first pipe 1 cooperate with the corresponding positioning grooves on the second pipe 2, which can help the pipes to be accurately docked and prevent the situation of position deviation, with strong safety.

[0036] A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter further includes a flow regulating mechanism 31 disposed on the first pipe 1. The flow regulating mechanism 31 includes a rotating shaft 33 movably connected to a box body 32. One end of the rotating shaft 33 is fixedly connected with a rotating handle 34, and the relative other end is connected with a lead screw shaft 35 extending into the interior of the box body 32. A guide block 36 is helically driven on the lead screw shaft 35, and the bent rods at both ends of the guide block 36 penetrate through the first pipe 1 and extend to a baffle plate 37.

[0037] Specifically, a closed area is formed between the baffle plate 37 and the diversion groove on the first pipe 1. Both ends of the baffle plate 37 and a push block 38 are connected by swing rods 39. One end of the push block 38 penetrates through the first pipe 1 and extends to a moving frame 40, and one end of the moving frame 40 penetrates through a battery box 41 and extends to a power supply assembly 42.

[0038] Both sides of the swing rod 39 are installed on the baffle 37 and the push block 38 by means of rotational connection. The power supply assembly 42 includes a fixed rod 43 fixed on the moving 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 with a conical plug rod 46 extending to the gap of the battery pack 45. The battery pack 45 is installed on the annular preheater 47 by means of electrical connection. The annular preheater 47 is distributed on the outer wall of the communicating 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, as well as the second pipe 2 and the contraction end 5, are connected by installation flanges. And the electric slide rail 7 is arranged in a T shape on the bottom plate. The above shape design of the electric slide rail 7 can also keep the pipeline stable during the movement process, and the accuracy of the movement position is high.

[0039] In a low-temperature environment, due to the increase in the viscosity of the fluid, at this time, by increasing the diversion groove, the viscosity of the fluid is reduced. So manually rotate the handle 34, and the handle 34 drives the rotation of the lead screw shaft 35. Under the action of screw drive, the guide block 36 drives the downward movement of the baffle 37, thereby expanding the flow area of the diversion groove. Under the rotational connection of the swing rod 39, the push blocks 38 at both ends make the conical plug rod 46 pulled out from the battery pack 45. The battery packs 45 are connected and supply power to the annular preheater 47, so as to heat the front end of the pipeline. By increasing the temperature, the fluid can flow normally, thus ensuring the accurate measurement value of the flowmeter.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

[0041] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific embodiments. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited 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, Comprising: A first pipeline (1) and a second pipeline (2), which are movably connected by an expansion pipe (3) between the first pipeline (1) and the second pipeline (2), and a vortex generator (4) and a contraction end (5) are correspondingly connected to one ends of the first pipeline (1) and the second pipeline (2) away from the expansion pipe (3); A support adjustment mechanism (6), the support adjustment mechanism (6) includes electric slide rails (7) placed on both sides of the bottom plate, an electric slider (8) is movably connected to the electric slide rails (7), and the electric sliders (8) are fixedly connected by a cross beam to a first support rod (9) placed at the bottom of the first pipeline (1) and the second pipeline (2). An extension end at the center of the bottom of the cross beam is connected with a chute along the length direction of the bottom plate, and one end of the cross beam is connected with 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 and driven with a second gear plate (13) through a rotating tooth (12). The first gear plate (11) and the second gear plate (13) are arranged vertically and staggeredly, and the top end of the second gear plate (13) is installed with a second support rod (15) placed at the bottom of the expansion pipe (3) through a U-shaped rod (14).

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

3. The multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 2, wherein The elastic protection component (24) includes an elastic airbag (25) placed on the conduit. An activity cavity is formed between the elastic airbag (25) and the pressing plate (19), and a pressure relief valve (26) adapted to it is connected to the elastic airbag (25). The bottom of the rubber bowl (22) is connected with a conical part (27) by a threaded connection. A resisting surface (28) connected to the air cylinder (23) is provided on the outer wall edge of the conical part (27).

4. The multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 2, wherein, An I-shaped block (29) is installed on the inner wall of the cover body (10), and limiting grooves (30) connected to the extension end of the first gear plate (11) are opened on both sides of the I-shaped block (29).

5. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 1, characterized in that, It further includes a flow regulating mechanism (31) disposed on the first pipe (1). The flow regulating mechanism (31) includes a rotating shaft (33) movably connected to a box body (32). One end of the rotating shaft (33) is fixedly connected to a rotating handle (34), and the relatively other end is connected to a lead screw shaft (35) extending into the interior of the box body (32). A guide block (36) is helically driven on the lead screw shaft (35). The bent rods at both ends of the guide block (36) penetrate through the first pipe (1) and extend to a baffle plate (37).

6. The multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 5, wherein A closed area is formed between the baffle plate (37) and the diversion groove on the first pipe (1). Both ends of the baffle plate (37) and a push block (38) are connected by swing rods (39). One end of the push block (38) penetrates through the first pipe (1) and extends to a moving frame (40). One end of the moving frame (40) penetrates through a battery box (41) and extends to a power supply assembly (42).

7. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 6, characterized in that, Both sides of the swing rod (39) are installed on the baffle plate (37) and the push block (38) by means of rotational connection. The power supply assembly (42) includes a fixed rod (43) fixed on the moving 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 tapered plug (46) extending into the gap of the battery pack (45). The battery pack (45) is electrically connected to an annular preheater (47). The annular preheater (47) is distributed on the outer wall of the connecting pipe on the vortex generator (4). The extended section at the bottom of the battery box (41) is connected with a guide groove along the length direction of the bottom plate.

8. A multi-stage vortex suppression type high-precision long-diameter nozzle flowmeter according to claim 1, characterized in that, Both between the first pipe (1) and the vortex generator (4) and between 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.

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