Vortex shedding flowmeter

Abstract

The utility model discloses a vortex shedding flowmeter which comprises a measuring pipeline, a vortex generating body is arranged on the side, close to the inlet end, in the measuring pipeline, a boss is arranged above the middle of the measuring pipeline, a connecting rod extending into the measuring pipeline is arranged in the boss, and a measuring probe is arranged at the bottom end of the connecting rod. The measuring probe is located at the downstream position of the vortex generating body in the flowing direction of fluid in the measuring pipeline; specifically, a sealing assembly is arranged between the connecting rod and the boss and comprises a sleeve and a sealing ring, the sleeve is connected with the boss through threads, a limiting table is arranged on the connecting rod, the sealing ring abuts against the limiting table, a spring is arranged between the limiting table and the sleeve, and the connecting rod is movably sleeved with the spring. The measuring probe can be disassembled and assembled without disassembling the vortex shedding flowmeter from a pipeline, maintenance personnel can overhaul and maintain the vortex shedding flowmeter conveniently, the maintenance process is simplified, the maintenance time is shortened, and therefore the production progress of an enterprise is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of flow meters, in particular to a vortex flow meter. Background Art

[0002] In production practice, flowmeters are commonly used instruments for transporting fluids such as gas and steam. Vortex flowmeters are a relatively advanced type of flowmeter in this field, offering advantages such as high sensitivity, a wide range of applications, stable operation, high accuracy, and excellent fluid compatibility. Vortex flowmeters, developed and manufactured based on the Karman vortex principle, measure the volume flow rate, standard flow rate, or mass flow rate of gases, steam, or liquids. They are primarily used for measuring the flow of fluids such as gas, liquid, and steam in industrial pipelines. They are characterized by low pressure loss, a wide measuring range, and high accuracy. When measuring operating volume flow, they are virtually unaffected by parameters such as fluid density, pressure, temperature, and viscosity. Due to their low power consumption, wide range, low resistance loss, wide application range, stable operation, and easy installation and commissioning, vortex flowmeters are widely used in industrial production, energy metering, environmental protection projects, and transportation.

[0003] The vortex flowmeter is based on the Karman vortex principle. After the measured medium passes through the vortex generator in the flow channel, it will separate and produce two rows of stable vortices. The separation frequency of the vortex is proportional to the current flow rate. The measuring probe in the vortex flowmeter can detect the vortex field and convert the vibration frequency into an electrical signal for data processing, thereby reflecting the current flow value. The measuring probe in the vortex flowmeter needs to be regularly inspected and maintained during use to determine whether the vortex flowmeter is working properly. The existing maintenance method requires the vortex flowmeter to be removed from the pipeline and then inspected and maintained by maintenance personnel. However, the vortex flowmeter installed on the pipeline is not only difficult to disassemble, but also affects the transportation of fluid media in the pipeline, and may even cause a long period of downtime, affecting the company's production progress. Summary of the Invention

[0004] In order to solve the problems pointed out in the background technology, the utility model proposes a vortex flowmeter, which can realize the disassembly and installation of the measuring probe without removing the vortex flowmeter from the pipeline, making it convenient for maintenance personnel to inspect and maintain the vortex flowmeter, simplifying the maintenance process, shortening the maintenance time, and thus ensuring the production progress of the enterprise.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A vortex flowmeter includes a measuring pipe, wherein the left end of the measuring pipe is an inlet end, the right end of the measuring pipe is an outlet end, a vortex generator is provided in the measuring pipe near the inlet end, a boss is provided in the upper middle portion of the measuring pipe, a connecting rod is provided in the boss and extends into the measuring pipe, a measuring probe is provided at the bottom end of the connecting rod, and the measuring probe is located downstream of the vortex generator in the direction of fluid flow in the measuring pipe;

[0007] A sealing assembly is provided between the connecting rod and the boss, the sealing assembly comprising a sleeve and a sealing ring, the sleeve and the boss being connected by threads, a limit platform being provided on the connecting rod, the sealing ring being against the limit platform, a spring being provided between the limit platform and the sleeve, the spring being movably sleeved on the connecting rod;

[0008] The inlet and outlet ends of the measuring pipeline are both connected with connecting pipes through flanges, and each connecting pipe is respectively provided with a stop valve.

[0009] Preferably, the end of the connecting rod away from the measuring probe is connected to a converter, a mounting portion is integrally provided at the bottom of the converter, a base is provided between the boss and the measuring pipe, the outer diameter of the base is not less than the outer diameter of the boss, and the sealing ring rests against the base.

[0010] Preferably, the measuring probe is covered with a telescopic rubber sleeve, the upper end of the telescopic rubber sleeve is connected to the mounting portion by bolts, the lower end of the telescopic rubber sleeve is connected to the base by bolts, and the boss and sleeve are both located in the telescopic rubber sleeve.

[0011] Preferably, a three-way joint is provided on the measuring pipeline, a pressure reducing valve is provided on the side of the three-way joint away from the measuring pipeline, and the pressure reducing valve is located between the two stop valves.

[0012] Preferably, one end of the stop valve away from the connecting pipe is connected to a measuring auxiliary pipe via a flange.

[0013] Preferably, the vortex generator is in the shape of an elongated strip, with both ends of the vortex generator connected to the inner walls opposite to the measuring pipe. The cross section of the vortex generator is an isosceles trapezoid, and the long side and short side of the isosceles trapezoid are both arranged perpendicular to the fluid flow direction inside the measuring pipe.

[0014] Preferably, a through hole is opened on the pipe wall of the measuring pipe corresponding to one end of the vortex generator, and the through hole extends to the middle part of the vortex generator to form a blind hole, and a temperature sensor is installed in the blind hole.

[0015] Preferably, a pressure sensor is provided on the pipe wall of the measuring pipe close to the inlet end, and the pressure sensor is located upstream of the vortex generator in the fluid flow direction inside the measuring pipe.

[0016] Preferably, a fluid flow direction mark is provided on the outer surface of the measuring pipe.

[0017] The beneficial effects of the utility model are:

[0018] The vortex flowmeter provided by the present invention, when removing the measuring probe, close the stop valves at both ends of the measuring pipe to form a closed chamber between the two stop valves; then open the pressure reducing valve to reduce the pressure in the closed chamber until the pressure in the closed chamber is close to the external pressure. At this time, loosen and unscrew the sleeve, release the locking effect of the spring on the limit table, and remove the connecting rod together with the measuring probe from the measuring pipe, thereby achieving online disassembly of the measuring probe. Therefore, the present invention can achieve the disassembly and installation of the measuring probe without removing the vortex flowmeter from the pipe, making it easier for maintenance personnel to inspect and maintain the vortex flowmeter, simplifying the maintenance process, shortening maintenance time, and thus ensuring the production progress of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the present utility model.

[0020] Figure 2 This utility model Figure 1 Cross-sectional view at AA in the middle.

[0021] Figure 3 It is a schematic diagram of the boss and the interior of the sleeve in the utility model.

[0022] Figure 4 It is a schematic diagram of the measuring pipe and the converter in the utility model.

[0023] Figure 5 It is a schematic diagram of the vortex generating body in the utility model. DETAILED DESCRIPTION

[0024] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0025] like Figures 1 to 5As shown, a vortex flowmeter includes a measuring pipe 1, the left end of the measuring pipe 1 is the inlet end, the right end of the measuring pipe 1 is the outlet end, a vortex generator 2 is provided on the side of the measuring pipe 1 near the inlet end, a boss 3 is provided above the middle of the measuring pipe 1, a connecting rod 4 extending into the measuring pipe 1 is provided inside the boss 3, a measuring probe 5 is provided at the bottom end of the connecting rod 4, and the measuring probe 5 is located downstream of the vortex generator 2 in the fluid flow direction inside the measuring pipe 1; specifically, a sealing assembly is provided between the connecting rod 4 and the boss 3, the sealing assembly includes a sleeve 6 and a sealing ring 7, the sleeve 6 is connected to the boss 3 by threads, a limiting platform 8 is provided on the connecting rod 4, the sealing ring 7 abuts against the limiting platform 8, a spring 9 is provided between the limiting platform 8 and the sleeve 6, and the spring 9 is movably sleeved on the connecting rod 4.

[0026] With the above-described arrangement, when installing the connecting rod 4 of the present invention, the connecting rod 4 and the measuring probe 5 are simultaneously inserted into the measuring pipe 1, and the sealing ring 7 is fitted onto the connecting rod 4. The sleeve 6 is then rotated, threadedly connected to the boss 3. Once the sleeve 6 is in place, the sealing ring 7 is squeezed radially along the connecting rod 4 by the elastic force of the spring 9, thereby forming sealing surfaces between the sealing ring 7 and the connecting rod 4, and between the sealing ring 7 and the boss 3, thereby enhancing the sealing between the connecting rod 4 and the boss 3. It should be noted that, depending on the type of fluid passing through the measuring auxiliary pipe 18, the sealing ring 7 can be made of rubber to ensure a good sealing effect on the connecting rod 4.

[0027] In the present invention, the inlet and outlet ends of the measuring pipe 1 are connected to each other through flanges and are provided with connecting pipes 10, and each connecting pipe 10 is provided with a stop valve 11. Figure 1 , the two stop valves 11 are respectively located on both sides of the measuring probe 5; specifically, when the measuring probe 5 is disassembled, both ends of the vortex flowmeter need to be closed to ensure that the fluid medium inside the measuring auxiliary pipe 18 does not leak in large quantities when the measuring probe 5 is disassembled; therefore, by arranging the stop valves 11 at both ends of the measuring probe 5, both ends of the measuring pipe 1 can be closed when the measuring probe 5 is disassembled, thereby preventing the fluid medium in the measuring auxiliary pipe 18 from leaking from the boss 3 after the measuring probe 5 is removed.

[0028] In this embodiment, the end of the connecting rod 4 away from the measuring probe 5 is connected to a converter 12. The bottom of the converter 12 is integrally provided with a mounting portion 13. A base 14 is provided between the boss 3 and the measuring pipe 1. The outer diameter of the base 14 is not less than that of the boss 3. The sealing ring 7 abuts against the base 14. With this arrangement, when the sleeve 6 is tightened, the spring 9 can apply pressure to the limit platform 8 and the sealing ring 7, thereby achieving a corresponding sealing effect.

[0029] In this embodiment, the measuring probe 5 is fitted with a retractable rubber sleeve 15. The upper end of the retractable rubber sleeve 15 is bolted to the mounting portion 13, and the lower end of the retractable rubber sleeve 15 is bolted to the base 14. The boss 3 and sleeve 6 are both located within the retractable rubber sleeve 15. The provision of the retractable rubber sleeve 15 effectively prevents dust from entering the interior of the retractable rubber sleeve 15 after the connecting rod 4 of the vortex flowmeter is properly installed.

[0030] As an implementable embodiment, a three-way joint 16 is provided on the measuring pipe 1 , and a pressure reducing valve 17 is provided on the side of the three-way joint 16 away from the measuring pipe 1 . The pressure reducing valve 17 is located between the two stop valves 11 .

[0031] What the applicant wants to explain is that, compared with the external environment, the pressure inside the measuring pipe 1 is relatively high. The pressure reducing valve 17 provided can reduce the pressure inside the measuring pipe 1, so that a relatively safe pressure environment is formed inside the measuring pipe 1, making it convenient for maintenance personnel to safely remove the measuring probe 5; specifically, when removing the measuring probe 5, stop supplying the medium into the measuring pipe 1, and close the stop valves 11 at both ends of the measuring probe 5 to form a closed cavity between the two stop valves 11; open the pressure reducing valve 17 to reduce the pressure in the closed cavity until the pressure in the closed cavity is close to the external pressure. At this time, loosen the sleeve 6 to release its locking effect on the connecting rod 4, and remove the measuring probe 5 from the measuring pipe 1 to realize online disassembly of the measuring probe 5.

[0032] In this embodiment, one end of the stop valve 11 away from the connecting pipe 10 is connected to a measuring auxiliary pipe 18 via a flange.

[0033] Please refer again Figure 5 In this embodiment, the vortex generator 2 is elongated, with both ends connected to opposing inner walls of the measuring pipe 1. The cross-section of the vortex generator 2 is an isosceles trapezoid, with both the long and short sides of the isosceles trapezoid perpendicular to the direction of fluid flow within the measuring pipe 1. The long side of the isosceles trapezoid of the vortex generator 2 faces the inlet of the measuring pipe 1, forming a frontal surface, and the centerline of the isosceles trapezoid is aligned with the centerline of the measuring pipe 1.

[0034] It is worth noting that in this embodiment, a vortex generator 2 and a measuring probe 5 are sequentially arranged within the measuring pipe 1 along the flow direction of the fluid medium. The long side of the vortex generator 2, an isosceles trapezoid, faces the inlet of the measuring pipe 1. The fluid medium in the measuring auxiliary pipe 18, flowing into the vortex flowmeter from the inlet, encounters obstruction and alternately separates on either side of the vortex generator 2, releasing two rows of regular vortices. Furthermore, depending on actual operating conditions, vortex generators 2 of different specifications, such as cylindrical or triangular prism shapes, can also be selected. The specific structure and operating principle of the measuring probe 5 in the aforementioned vortex flowmeter are prior art and are not improved upon in this application.

[0035] In this embodiment, a through hole is formed in the wall of the measuring pipe 1 corresponding to one end of the vortex generating body 2. The through hole extends to the middle portion of the vortex generating body 2 to form a blind hole. A temperature sensor 19 is installed in the blind hole. The temperature sensor 19 is provided to measure the temperature of the fluid medium flowing through the measuring pipe 1.

[0036] Furthermore, a pressure sensor 20 is provided on the wall of the measuring pipe 1 near the inlet end. The pressure sensor 20 is located upstream of the vortex generator 2 in the fluid flow direction inside the measuring pipe 1. The pressure sensor 20 is provided to measure the pressure of the fluid medium.

[0037] In addition, a fluid flow direction mark is provided on the outer surface of the measuring pipe 1 to indicate the flow direction of the fluid medium in the measuring pipe 1 .

[0038] How to use this product:

[0039] When installing the connecting rod 4, after the sleeve 6 is installed in place, the sealing ring 7 is squeezed along the radial direction of the connecting rod 4 under the elastic force of the spring 9, so that sealing surfaces are formed between the sealing ring 7 and the connecting rod 4 and between the sealing ring 7 and the boss 3, which is beneficial to increase the sealing between the connecting rod 4 and the boss 3.

[0040] When it is necessary to disassemble the measuring probe 5, stop supplying the fluid medium into the measuring auxiliary pipe 18, and then separate one end of the telescopic rubber sleeve 15 from the base 14 by removing the bolts; next, close the stop valves 11 at both ends of the measuring pipe 1 to form a closed cavity between the two stop valves 11; then open the pressure reducing valve 17 to reduce the pressure in the closed cavity until the pressure in the closed cavity is close to the external pressure. At this time, loosen and unscrew the sleeve 6 to release the locking effect of the spring 9 on the limit platform 8, and remove the connecting rod 4 together with the measuring probe 5 from the measuring pipe 1 to realize the online disassembly of the measuring probe 5.

[0041] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A vortex flowmeter, comprising a measuring pipe (1), wherein the left end of the measuring pipe (1) is an inlet end, the right end of the measuring pipe (1) is an outlet end, and a vortex generator (2) is provided inside the measuring pipe (1) near the inlet end, characterized in that: A boss (3) is provided above the middle of the measuring pipe (1), a connecting rod (4) is provided inside the boss (3) and extends into the measuring pipe (1), a measuring probe (5) is provided at the bottom end of the connecting rod (4), and the measuring probe (5) is located downstream of the vortex generator (2) in the direction of fluid flow inside the measuring pipe (1); A sealing assembly is provided between the connecting rod (4) and the boss (3), the sealing assembly comprising a sleeve (6) and a sealing ring (7), the sleeve (6) and the boss (3) being connected via threads, a limiting platform (8) being provided on the connecting rod (4), the sealing ring (7) being in contact with the limiting platform (8), a spring (9) being provided between the limiting platform (8) and the sleeve (6), the spring (9) being movably sleeved on the connecting rod (4); The inlet and outlet ends of the measuring pipeline (1) are both connected to connecting pipes (10) via flanges, and each connecting pipe (10) is provided with a stop valve (11).

2. The vortex flowmeter according to claim 1, characterized in that: The end of the connecting rod (4) away from the measuring probe (5) is connected to a converter (12), and a mounting portion (13) is integrally provided at the bottom of the converter (12). A base (14) is provided between the boss (3) and the measuring pipe (1), and the outer diameter of the base (14) is not less than the outer diameter of the boss (3), and the sealing ring (7) abuts against the base (14).

3. The vortex flowmeter according to claim 1, characterized in that: A telescopic rubber sleeve (15) is sleeved on the measuring probe (5); the upper end of the telescopic rubber sleeve (15) is connected to the mounting portion (13) via bolts; the lower end of the telescopic rubber sleeve (15) is connected to the base (14) via bolts; and the boss (3) and the sleeve (6) are both located within the telescopic rubber sleeve (15).

4. The vortex flowmeter according to claim 1, characterized in that: The measuring pipe (1) is provided with a three-way joint (16), and a pressure reducing valve (17) is provided on the side of the three-way joint (16) away from the measuring pipe (1), and the pressure reducing valve (17) is located between the two stop valves (11).

5. The vortex flowmeter according to claim 1, characterized in that: One end of the stop valve (11) away from the connecting pipe (10) is connected to a measuring auxiliary pipe (18) via a flange.

6. The vortex flowmeter according to claim 1, characterized in that: The vortex generator (2) is in the shape of an elongated strip, with both ends of the vortex generator (2) connected to the inner walls of the measuring pipe (1) opposite to each other. The cross section of the vortex generator (2) is an isosceles trapezoid, and the long side and the short side of the isosceles trapezoid are both arranged perpendicular to the direction of fluid flow inside the measuring pipe (1).

7. The vortex flowmeter according to claim 6, characterized in that: A through hole is provided on the wall of the measuring pipe (1) corresponding to one end of the vortex generator (2), and the through hole extends to the middle portion of the vortex generator (2) to form a blind hole, in which a temperature sensor (19) is installed.

8. The vortex flowmeter according to claim 1, characterized in that: A pressure sensor (20) is provided on the pipe wall of the measuring pipe (1) near the inlet end. The pressure sensor (20) is located upstream of the vortex generator (2) in the direction of fluid flow inside the measuring pipe (1).

9. The vortex flowmeter according to claim 1, characterized in that: The outer surface of the measuring pipe (1) is provided with a fluid flow direction mark.

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