Integrated elbow flow meter for detection

Abstract

The utility model provides an integrated elbow flow meter for detection, which comprises an inlet variable-diameter section, an elbow section and an outlet variable-diameter section which are sequentially concentric and integrally formed along the flowing direction of fluid, the inner diameter of the inlet variable-diameter section is gradually reduced along the flowing direction of the fluid, and the inner diameter of the outlet variable-diameter section is gradually increased along the flowing direction of the fluid. The inlet reducing section, the bent pipe section and the outlet reducing section are sequentially concentric and integrally formed in the flowing direction of the fluid, and the inner diameter of the inlet reducing section is gradually reduced in the flowing direction of the fluid, so that the fluid stably enters the bent pipe section, disturbance and vortex of the fluid in the flowing process are reduced, and the measurement precision is further improved. And the inner diameter of the outlet reducing section is gradually increased along the flowing direction of the fluid, so that the fluid recovers a stable flowing state when leaving the bent pipe section, and the measurement accuracy is further ensured. Through the integrated design, the overall size of the flow meter is greatly reduced, and the flow meter can be easily installed in a narrow space.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to an integrated elbow flowmeter for detection. Background Art

[0002] An elbow flowmeter is a differential pressure flowmeter for measuring the fluid flow in a pipeline. When the fluid passes through the elbow, due to the constraint of the elbow, the fluid is forced to make a similar circular motion. The centrifugal force generated when the fluid makes a circular motion acts on the inner and outer sides of the elbow, creating a pressure difference between the inner and outer sides of the elbow sensor. The magnitude of this pressure difference is related to the density of the fluid, the average flow velocity, and the radius of curvature of the circular motion of the fluid. By measuring this pressure difference value, the flow velocity of the fluid in the pipeline can be calculated, and then the flow value of the fluid can be calculated.

[0003] The applicant of the present invention has found that the prior art has at least the following technical problems:

[0004] Currently, when installing an elbow flowmeter, it is usually necessary to install a straight pipe with a length of 5 times the diameter at its front end and a straight pipe with a length of 2 times the diameter at its rear end to ensure the stability of the fluid flow field and thus ensure the measurement accuracy. However, in some cases where the layout of the pipeline system is compact and the space is limited, the lengths of the front and rear variable diameter sections required for the elbow flowmeter may exceed the available space, and the overall volume of the flowmeter is relatively large, resulting in inability to install or the need for complex pipeline modification, which limits the application range of the elbow flowmeter and has limitations in use.

[0005] Furthermore, the patent application number CN200620128057.0 discloses a built-in elbow flowmeter, including a flange, an elbow sensor, a pressure-taking short pipe, and an outer sleeve. The outer sleeve has the same diameter as the measured pipeline, and flanges connected to the measured pipeline are fixedly connected to both ends thereof. An elbow sensor is installed in the middle thereof, and eccentric special-shaped variable diameter pipes are installed at both ends of the elbow sensor. Although the overall volume is reduced, there are still the following technical problems: The setting of the eccentric special-shaped variable diameter pipe will cause an asymmetric flow velocity distribution when the fluid passes through the variable diameter pipe, resulting in additional vortices and disturbances, thus affecting the measurement accuracy of the flowmeter and increasing the instability of the flow field. Moreover, the manufacturing process of the eccentric special-shaped variable diameter pipe is more complex, increasing the production cost and processing difficulty. Then, it is still necessary to install steady-flow straight pipes at its front and rear ends.

[0006] In view of this, the present utility model is specifically proposed. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide an integrated elbow flowmeter for detection, so as to solve the technical problems existing in the prior art that the design of the elbow flowmeter has defects, the installation space is limited, the flow field is unstable, affecting the measurement accuracy, and it cannot be installed in a narrow space, resulting in limitations in use. The preferred technical solutions among the many technical solutions provided by the present utility model and the many technical effects that can be produced will be elaborated in detail below.

[0008] To achieve the above object, the present utility model provides the following technical solutions:

[0009] An integrated elbow flowmeter for detection provided by the present utility model includes an inlet reducer section, an elbow section, and an outlet reducer section that are concentric and integrally formed in sequence along the fluid flow direction. The inner diameter of the inlet reducer section gradually decreases along the fluid flow direction, and the inner diameter of the outlet reducer section gradually increases along the fluid flow direction.

[0010] Preferably, a honeycomb rectifier is installed at the liquid inlet end of the inlet reducer section, and the liquid inlet end face of the honeycomb rectifier is flush with the liquid inlet end face of the inlet reducer section.

[0011] Preferably, a stepped structure is provided at the liquid inlet end of the inlet reducer section for installing the honeycomb rectifier. Installation grooves are opened on the inner wall of the stepped structure, and sealing rubber rings are installed in the installation grooves.

[0012] Preferably, the length of the inlet reducer section is 1 - 3 times the maximum inner diameter of the inlet reducer section, and the ratio between the maximum inner diameter and the minimum inner diameter of the inlet reducer section is 1.11 - 2.

[0013] Preferably, the length of the outlet reducer section is 0.5 - 2 times the maximum inner diameter of the outlet reducer section, and the ratio between the maximum inner diameter and the minimum inner diameter of the outlet reducer section is 1.1 - 2.

[0014] Preferably, the curvature radius of the elbow section is 1 - 2 times its inner diameter.

[0015] Preferably, sensors are provided in the middle of the elbow section. The number of sensors is more than two, and they are arranged uniformly in sequence along the circumferential direction of the elbow section. The sensing ends of the sensors all extend into the interior of the elbow section for real-time sensing and measuring the pressure changes generated when the fluid makes a circular motion in the elbow section.

[0016] Preferably, the liquid inlet end of the inlet reducer section extends radially outward to form a first connection disk. A first annular groove is opened on the side of the first connection disk away from the inlet reducer section. A first sealing gasket is provided in the first annular groove. First connection holes are opened on the outer peripheral edge of the first connection disk, and bolts pass through the first connection holes of the first connection disk and are connected to the corresponding holes of the flange of the pipeline to be measured.

[0017] Preferably, the liquid outlet end of the outlet diameter-changing section extends radially outward to form a second connection disk. A second annular groove is provided on the side of the second connection disk away from the outlet diameter-changing section. A second sealing gasket is arranged in the second annular groove. Second connection holes are provided on the outer peripheral edge of the second connection disk. After a bolt passes through the second connection holes of the second connection disk, it is connected to the corresponding holes of the flange of the pipeline to be measured.

[0018] The preferred technical solution of the present utility model can at least further produce the following technical effects:

[0019] The present utility model effectively avoids the technical problems existing in the prior art, such as the design of the elbow flowmeter having defects, limited installation space, unstable flow field, affecting measurement accuracy, being unable to be installed in a narrow space, and having limitations in use. The present utility model provides an integrated elbow flowmeter for detection, including an inlet diameter-changing section, an elbow section, and an outlet diameter-changing section that are concentric and integrally formed in sequence along the fluid flow direction. The inner diameter of the inlet diameter-changing section gradually decreases along the fluid flow direction, and the inner diameter of the outlet diameter-changing section gradually increases along the fluid flow direction. By integrally forming the inlet diameter-changing section, the elbow section, and the outlet diameter-changing section concentrically in sequence along the fluid flow direction, and the inner diameter of the inlet diameter-changing section gradually decreasing along the fluid flow direction, the fluid can enter the elbow section smoothly, reducing the disturbance and vortex of the fluid during the flow process, thereby improving the measurement accuracy. The inner diameter of the outlet diameter-changing section gradually increases along the fluid flow direction, so that the fluid can restore a stable flow state when leaving the elbow section, further ensuring the accuracy of the measurement. Moreover, through the integrated design, the overall volume of the flowmeter is greatly reduced, enabling it to be easily installed in a narrow space, with a simple structure, reasonable design, simplified manufacturing process, and reduced production cost and processing difficulty. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic structural diagram of an integrated elbow flowmeter for detection provided by the present utility model;

[0022] Figure 2 is an enlarged view of part A.

[0023] In the figure:

[0024] 1. Inlet diameter-changing section; 11. Step structure; 111. First installation groove; 112. Second installation groove; 12. First connection plate; 121. First connection hole; 122. First annular groove; 2. Elbow section; 3. Outlet diameter-changing section; 31. Second connection plate; 311. Second connection hole; 312. Second annular groove; 4. Honeycomb rectifier; 41. Frame; 42. Pipe; 43. Colloid; 5. Damping net; 6. First sealing ring; 7. Second sealing ring; 8. First sealing gasket; 9. Second sealing gasket; 10. Sensor. Detailed implementation mode

[0025] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present utility model.

[0026] As Figure 1 - Figure 2 shown, the present utility model provides an integrated elbow flowmeter for detection, which includes an inlet diameter-changing section 1, an elbow section 2 and an outlet diameter-changing section 3 that are concentric and integrally formed in sequence along the fluid flow direction. The inner diameter of the inlet diameter-changing section 1 gradually decreases along the fluid flow direction, and the inner diameter of the outlet diameter-changing section 3 gradually increases along the fluid flow direction.

[0027] By integrally forming the inlet diameter-changing section 1, the elbow section 2 and the outlet diameter-changing section 3 concentrically in sequence along the fluid flow direction, when the fluid enters the inlet diameter-changing section 1 through the measured pipe 42, due to the gradually decreasing inner diameter of the inlet diameter-changing section 1, the fluid is smoothly guided into the elbow section 2, reducing the disturbance and eddy current during the flow process. In the elbow section 2, the fluid generates a centrifugal force, acting on the inner and outer sides of the elbow, forming a pressure difference. By measuring the pressure difference, the flow velocity and flow rate of the fluid can be calculated. After the fluid leaves the elbow section 2, it passes through the outlet diameter-changing section 3. Due to its gradually increasing inner diameter, the fluid resumes a stable flow state, further ensuring the accuracy of the measurement.

[0028] Moreover, through the integrated design of the present utility model, the overall volume of the flowmeter is greatly reduced, enabling it to be easily installed in a narrow space. The structure is simple, the design is reasonable, the manufacturing process is simplified, and the production cost and processing difficulty are reduced.

[0029] Furthermore, the inlet diameter-changing section 1, the elbow section 2 and the outlet diameter-changing section 3 are smoothly transitioned to keep the fluid stable during the flow process.

[0030] As an alternative implementation, a honeycomb rectifier 4 is installed at the liquid inlet end of the inlet diameter-changing section 1, and the liquid inlet end face of the honeycomb rectifier 4 is flush with the liquid inlet end face of the inlet diameter-changing section 1.

[0031] Furthermore, the honeycomb rectifier 4 includes a frame 41 and a number of pipes 42. The cross-section of the pipes 42 is square, circular or hexagonal, and they are arranged side by side within the frame 41. The number of pipes 42 constitutes the flow channels of the honeycomb rectifier 4, and the central axes of the flow channels are arranged parallel to the central axis of the inlet diameter-changing section 1.

[0032] When the fluid enters the inlet diameter-changing section 1 through the measured pipe 42, the large vortices in the fluid are first cut into small vortices by the honeycomb rectifier 4, thereby eliminating the rotation and lateral flow of the fluid, and making the flow state of the fluid improved and become more stable and consistent before entering the elbow section 2.

[0033] A damping screen 5 is provided at the liquid outlet end of the honeycomb rectifier 4 to further improve the rectification effect and make the fluid more stable before entering the elbow section 2.

[0034] As an alternative implementation, a stepped structure 11 is provided at the liquid inlet end of the inlet diameter-changing section 1 for installing the honeycomb rectifier 4. Installation grooves are provided on the inner wall of the stepped structure 11, and sealing rubber rings are installed in the installation grooves.

[0035] Furthermore, the stepped structure 11 has a vertical section inner wall and a flat section inner wall. A first installation groove 111 is provided on the vertical section inner wall, and a first sealing rubber ring is installed in the first installation groove 111. A second installation groove 112 is provided on the flat section inner wall, and a second sealing rubber ring is installed in the second installation groove 112.

[0036] The side and bottom surfaces of the frame 41 of the honeycomb rectifier 4 are closely attached to the vertical section inner wall and the flat section inner wall of the stepped structure 11 respectively, so that the honeycomb rectifier 4 is stably installed on the stepped structure 11. The first sealing rubber ring and the second sealing ring 7 effectively prevent fluid leakage between the inner wall of the stepped structure 11 and the honeycomb rectifier 4 and improve the sealing performance.

[0037] Colloid 43 can also be filled between the frame 41 and the stepped structure 11 to further improve the connection stability. The colloid 43 can effectively fill the tiny gaps between the frame 41 and the stepped structure 11, prevent fluid leakage, and enhance the connection strength between the two.

[0038] As an alternative implementation, the length of the inlet diameter-changing section 1 is 1-3 times the maximum inner diameter of the inlet diameter-changing section 1, and the ratio between the maximum inner diameter and the minimum inner diameter of the inlet diameter-changing section 1 is 1.11-2.

[0039] By setting the inlet diameter-changing section 1 in this way, the overall volume of the elbow flowmeter can be effectively reduced, and the stability of the fluid and the accuracy of measurement can be further improved. The length of the inlet diameter-changing section 1 is 1-3 times the maximum inner diameter of the inlet diameter-changing section 1, so that the fluid has enough distance for a smooth transition before entering the elbow section 2. Compared with the prior art where a straight pipe with a length of up to 5 times the diameter needs to be installed at the front end of the elbow, the length of the inlet diameter-changing section 1 of the present utility model is greatly reduced, thus reducing the overall volume of the elbow flowmeter. Although the length of the inlet diameter-changing section 1 is reduced, the ratio between the maximum inner diameter and the minimum inner diameter of the inlet diameter-changing section 1 is 1.11-2, so that its inner diameter gradually decreases, enabling the fluid to gradually adapt to the shape and flow rate of the elbow section 2 before entering the elbow section 2, thereby reducing the unstable factors during the flow process, smoothly guiding the fluid into the elbow section 2, and improving the accuracy of measurement.

[0040] As an optional implementation manner, the length of the outlet diameter-changing section 3 is 0.5-2 times the maximum inner diameter of the outlet diameter-changing section 3, and the ratio between the maximum inner diameter and the minimum inner diameter of the outlet diameter-changing section 3 is 1.1-2.

[0041] The length of the outlet diameter-changing section 3 is 0.5-2 times the maximum inner diameter of the outlet diameter-changing section 3, which also reduces the length to a certain extent. Moreover, after the fluid leaves the elbow section 2, there is enough distance for a smooth transition to restore a stable flow state. At the same time, the ratio between the maximum inner diameter and the minimum inner diameter of the outlet diameter-changing section 3 is 1.1-2, so that its inner diameter gradually increases, which helps to further reduce the disturbance and eddy current when the fluid leaves, and improves the accuracy of measurement.

[0042] As an optional implementation manner, the curvature radius of the elbow section 2 is 1-2 times its inner diameter.

[0043] By setting it in this way, while keeping the volume of the elbow section 2 small, it can ensure that enough centrifugal force is generated by the fluid in the elbow to accurately measure the pressure difference and calculate the flow velocity and flow rate.

[0044] As an optional implementation manner, a sensor 10 is arranged in the middle of the elbow section 2. The number of sensors 10 is more than two, and they are evenly arranged in sequence along the circumferential direction of the elbow section 2. The sensing ends of the sensors 10 all extend into the interior of the elbow section 2 and are used to sense and measure in real time the pressure changes generated when the fluid makes a circular motion in the elbow section 2.

[0045] By setting it in this way, the sensor 10 can comprehensively and evenly sense the pressure changes generated when the fluid makes a circular motion in the elbow section 2. Compared with the prior art where only two sensors 10 are set, in the present utility model, multiple sensors 10 are arranged along the circumferential direction of the elbow section 2, which not only improves the accuracy of measurement, reduces errors, but also ensures the real-time nature of measurement and accurately understands the flow state of the fluid.

[0046] As an alternative implementation, the liquid inlet end of the inlet diameter-changing section 1 extends radially outward to form a first connection disk 12. A first annular groove 122 is provided on the side of the first connection disk 12 away from the inlet diameter-changing section 1. A first sealing gasket 8 is arranged in the first annular groove 122. First connection holes 121 are provided on the outer peripheral edge of the first connection disk 12. Bolts pass through the first connection holes 121 of the first connection disk 12 and are connected to corresponding holes of the flange of the pipeline 42 to be measured.

[0047] The bolts pass through the first connection holes 121 and are connected to corresponding holes of the flange of the pipeline 42 to be measured, so as to stably connect the inlet diameter-changing section 1 and the pipeline 42 to be measured.

[0048] The first connection disk 12 increases the contact area between the inlet diameter-changing section 1 and the flange of the pipeline 42 to be measured, and also improves the stability of the connection. Moreover, the first sealing gasket 8 can effectively prevent fluid leakage at the connection, improving the sealing performance of the connection.

[0049] As an alternative implementation, the liquid outlet end of the outlet diameter-changing section 3 extends radially outward to form a second connection disk 31. A second annular groove 312 is provided on the side of the second connection disk 31 away from the outlet diameter-changing section 3. A second sealing gasket 9 is arranged in the second annular groove 312. Second connection holes 311 are provided on the outer peripheral edge of the second connection disk 31. Bolts pass through the second connection holes 311 of the second connection disk 31 and are then connected to corresponding holes of the flange of the pipeline 42 to be measured.

[0050] The bolts pass through the second connection holes 311 and are connected to corresponding holes of the flange of the pipeline 42 to be measured, so as to stably connect the outlet diameter-changing section 3 and the pipeline 42 to be measured.

[0051] The second connection disk 31 increases the contact area between the outlet diameter-changing section 3 and the flange of the pipeline 42 to be measured, and also improves the stability of the connection. Moreover, the second sealing gasket 9 can effectively prevent fluid leakage at the connection, improving the sealing performance of the connection.

[0052] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be seen in the same or similar content of other embodiments.

[0053] In the description of the present utility model, it should be noted that unless otherwise stated, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0055] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example", or "an example" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0056] As mentioned above, it is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claimed rights.

Claims

1. An integrated elbow flowmeter for detection, characterized in that: It comprises an inlet diameter reducing section, a bend section and an outlet diameter reducing section which are concentrically and integrally formed in sequence along the fluid flow direction. The inner diameter of the inlet diameter reducing section gradually decreases along the fluid flow direction, and the inner diameter of the outlet diameter reducing section gradually increases along the fluid flow direction.

2. The integrated elbow flowmeter for detection according to claim 1, characterized in that: A honeycomb rectifier is installed at the liquid inlet end of the inlet diameter-reducing section, and the liquid inlet end surface of the honeycomb rectifier is flush with the liquid inlet end surface of the inlet diameter-reducing section.

3. The integrated elbow flowmeter for detection according to claim 2, characterized in that: The liquid inlet end of the inlet diameter reducing section is provided with a stepped structure for installing the honeycomb rectifier. An installation groove is provided on the inner wall of the stepped structure, and a sealing rubber ring is installed in the installation groove.

4. The integrated elbow flowmeter for detection according to claim 1, characterized in that: The length of the inlet reducing section is 1-3 times of the maximum inner diameter of the inlet reducing section, and the ratio between the maximum inner diameter of the inlet reducing section and its minimum inner diameter is 1.11-2.

5. The integrated elbow flowmeter for detection according to claim 1, characterized in that: The length of the outlet diameter-reducing section is 0.5-2 times of the maximum inner diameter of the outlet diameter-reducing section, and the ratio between the maximum inner diameter of the outlet diameter-reducing section and its minimum inner diameter is 1.1-2.

6. The integrated elbow flowmeter for detection according to claim 1, characterized in that: The curvature radius of the curved pipe section is 1-2 times of its inner diameter.

7. The integrated elbow flowmeter for detection according to claim 1, characterized in that: A sensor is arranged in the middle of the curved pipe section. The number of the sensors is greater than two and they are evenly arranged in sequence along the circumference of the curved pipe section. The sensing ends of the sensors extend into the interior of the curved pipe section for real-time sensing and measuring the pressure changes generated when the fluid moves in a circular motion in the curved pipe section.

8. The integrated elbow flowmeter for detection according to claim 1, characterized in that: The liquid inlet end of the inlet reducing section extends radially outward to form a first connecting plate, a first annular groove is provided on the side of the first connecting plate away from the inlet reducing section, a first sealing gasket is arranged in the first annular groove, a first connecting hole is provided on the outer periphery of the first connecting plate, and a bolt passes through the first connecting hole of the first connecting plate and is connected to a corresponding hole of the flange of the measured pipeline.

9. The integrated elbow flowmeter for detection according to claim 1, characterized in that: The liquid outlet end of the outlet reducing section extends radially outward to form a second connecting plate, a second annular groove is provided on the side of the second connecting plate away from the outlet reducing section, a second sealing gasket is provided in the second annular groove, a second connecting hole is provided on the outer periphery of the second connecting plate, and a bolt passes through the second connecting hole of the second connecting plate and is connected to the corresponding hole of the flange of the measured pipeline.

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