Wedge-type streamline anti-blocking wear-resistant flow detection device

Abstract

The utility model provides a wedge-type streamline anti-blocking wear-resistant flow detection device which comprises a measuring piece and a throttling piece. The measuring piece comprises a measuring pipe and flanges at the two ends of the measuring pipe. The measuring pipe is provided with a positive pressure tapping pipe and a negative pressure tapping pipe which are communicated with the measuring pipe. The throttling element comprises a semi-elliptical wedge-type throttling element and an asymmetric fishtail streamline throttling element which are arranged on the upper side and the lower side in the measuring pipe. A throttling element of the device throttles at the upper pipe wall and the lower pipe wall of a measuring pipe, the flowing speed at the center of the measuring pipe is the highest, the flowing speed gradient of a measured medium is gradually reduced from the center of the measuring pipe to the pipe wall of the measuring pipe, and solid particles and dirt impurities contained in the measured medium are deposited on the upper surface of the asymmetric fishtail streamline throttling element. And the liquid slowly flows through the bottom of the measuring pipe along with the measured medium through the downstream end, so that the flowing speed of the liquid is reduced, the kinetic energy of solid particles and dirt impurities is reduced, the scouring of the measured medium to the downstream pipe wall of the measuring pipe is reduced, and the abrasion of the measured medium to the pipe wall of the measuring pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flow detection, and specifically, to a wedge-shaped streamline anti-blocking and wear-resistant flow detection device. Background Art

[0002] The wedge-shaped flowmeter is a new type of throttling differential pressure flow measurement instrument. It can perform high-precision flow measurement under high viscosity and low Reynolds number conditions, and has incomparable advantages and irreplaceable functions in flow measurement occasions with low flow velocity, small flow rate, and large pipe diameter. It can be widely used for the flow measurement of media such as high-viscosity heavy oil, residue oil, diesel oil, machine oil, etc., industrial gas, coke oven gas, blast furnace gas, producer gas, city gas, hydrogen, nitrogen, air, water vapor, sewage liquid, etc.

[0003] For the existing wedge-shaped flowmeters, due to the solid particles and dirty impurities contained in the measured medium precipitating, it is easy to cause erosion to the inner wall of the measuring pipe, and long-term friction is likely to cause wear of the measuring pipe wall. In addition, the solid particles and dirty impurities contained in the measured medium are likely to accumulate upstream of the throttling element, resulting in local blockage of the measuring pipe and ultimately affecting the measurement accuracy. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a wedge-shaped streamline anti-blocking and wear-resistant flow detection device, which reduces the erosion of the surface of the measuring pipe by solid particles and dirty impurities in the measured medium, prevents the solid particles and dirty impurities from accumulating upstream of the throttling element, avoids blockage of the measuring pipe, and improves the wear resistance and detection accuracy of the detection device.

[0005] The utility model provides a wedge-shaped streamline anti-blocking and wear-resistant flow detection device, which includes a measuring member and a throttling member, wherein:

[0006] The measuring member includes a measuring pipe, flanges are respectively arranged at both ends of the measuring pipe, positive and negative pressure tapping holes are opened on the upper wall of the measuring pipe, a positive pressure tapping pipe and a negative pressure tapping pipe are respectively installed on the outer side of the upper part of the measuring pipe wall, and their inner holes are communicated with the inner cavity of the measuring pipe through the positive and negative pressure tapping holes on the pipe wall;

[0007] The throttling member includes a semi-elliptical wedge-shaped throttling element and an asymmetric fish-tail streamline throttling element. The semi-elliptical wedge-shaped throttling element is installed inside the upper part of the measuring pipe, and a cavity is arranged inside it. The asymmetric fish-tail streamline throttling element is installed inside the lower part of the measuring pipe, and it is symmetrically arranged with the semi-elliptical wedge-shaped throttling element through the axis of the measuring pipe.

[0008] Preferably, the lower vertex of the semi-elliptical wedge-shaped throttling element and the upper vertex of the asymmetric fish-tail streamline throttling element are on the same diameter line of the measuring pipe.

[0009] Preferably, the distance between the upper vertex of the asymmetric fish-tail streamline throttling element and the lowest point of the inner wall of the measuring tube does not exceed 30 mm.

[0010] Preferably, the upstream of the asymmetric fish-tail streamline throttling element is a streamline part, and its downstream is a fish-tail part. The curve of the streamline part is convex upward, and the curve of the fish-tail part is concave downward. Moreover, the transition angle between the streamline part and the fish-tail part relative to the lower pipe wall of the measuring tube is within 10°.

[0011] Preferably, the surfaces of the semi-elliptical wedge throttling element and the asymmetric fish-tail streamline throttling element are evenly sprayed with a wear-resistant layer, and the wear-resistant layer is an STL alloy.

[0012] Preferably, the semi-elliptical wedge throttling element and the asymmetric fish-tail streamline throttling element are fixedly connected or detachably connected inside the measuring tube.

[0013] Preferably, the fixed connection is welding.

[0014] Preferably, the detachable connection is a bolt connection. Non-through threaded holes are provided on the semi-elliptical wedge throttling element and the asymmetric fish-tail streamline throttling element, and bolt holes are provided on the measuring tube. Bolts are fitted into the bolt holes and the threaded holes.

[0015] Preferably, annular sealing rings are respectively provided at the contact positions between the semi-elliptical wedge throttling element and the asymmetric fish-tail streamline throttling element and the measuring tube.

[0016] Preferably, a boss is provided in the cavity of the semi-elliptical wedge throttling element, and the threaded hole is provided on the boss.

[0017] The working principle of the present utility model:

[0018] 1. When the measured medium flows through the minimum cross-section of the gap between the semi-elliptical wedge throttling element and the asymmetric fish-tail streamline throttling element, due to the semi-elliptical structure and streamline structure of the throttling element, the permanent pressure loss in the measuring tube is greatly reduced. When the measured medium passes through the minimum cross-section, due to the throttling of the throttling element at the upper and lower pipe walls of the measuring tube, the flow velocity at the center of the measuring tube is the largest, and the flow velocity gradient of the measured medium gradually decreases from the center of the measuring tube to the pipe wall of the measuring tube, reducing the erosion of the measured medium on the downstream pipe wall of the measuring tube and reducing the wear of the measured medium on the pipe wall of the measuring tube.

[0019] 2. The asymmetric fish-tail streamline throttle element includes an asymmetric fish-tail shape and a streamline structure. After the measured medium flows through the highest point of this throttle element, the solid particles and dirty impurities contained in it precipitate on the upper surface of the asymmetric fish-tail streamline throttle element, and slowly flow through the bottom of the measuring tube along with the measured medium at its downstream end, slowing down its flow velocity, reducing the kinetic energy of the solid particles and dirty impurities, reducing the wear on the bottom of the measuring tube, extending the service life of the flow detection device, and improving the use effect of the flow detection device.

[0020] 3. The semi-elliptical wedge throttle element is symmetric with the asymmetric fish-tail streamline throttle element about the axis of the measuring tube. The short-axis vertex of the lower semi-ellipse of the semi-elliptical wedge throttle element and the highest point of the asymmetric fish-tail streamline throttle element are on the same diameter line of the measuring tube, ensuring that this is the minimum cross-sectional area where the measured medium flows through. According to the different specifications of the measuring tube and the size of the flow rate of the measured medium, the height of the semi-elliptical wedge throttle element can be appropriately adjusted to maximize the kinetic energy and flow rate when the measured medium flows through the minimum cross-sectional area, reduce the static pressure energy, make the differential pressure value between the positive pressure tapping tube and the negative pressure tapping tube reach the maximum, ensure the stability of the flow detection device, and improve the detection accuracy.

[0021] 4. The semi-elliptical wedge throttle element is formed by one-time pressing of a steel plate and has a cavity structure inside, which reduces the weight of the entire flow detection device and the cost. The lower part of the semi-elliptical wedge throttle element is designed as a semi-ellipse, which is smoothly transitioned with the two hypotenuses of the semi-elliptical wedge throttle element, reducing the resistance when the medium flows through this throttle element and reducing the pressure loss.

[0022] 5. The asymmetric fish-tail streamline throttle element is symmetric with the semi-elliptical wedge throttle element about the axis of the measuring tube. The upstream of the asymmetric fish-tail streamline throttle element is in the form of a streamline structure, and the downstream is in the shape of a fish-tail. The transition angle relative to the lower pipe wall of the measuring tube is below 10°. The distance between the highest point of the asymmetric fish-tail streamline throttle element and the bottom of the measuring tube depends on the diameter of the measuring tube, and the maximum distance should not exceed 30 mm. This can prevent the solid particles and dirty impurities contained in the measured medium from accumulating upstream of this throttle element and affecting the measurement accuracy.

[0023] 6. The surfaces of the semi-elliptical wedge throttle element and the asymmetric fish-tail streamline throttle element are evenly sprayed with STL alloy to improve the scouring ability of the medium flowing at high speed on the surfaces of the semi-elliptical wedge throttle element and the asymmetric fish-tail streamline throttle element, and enhance the surface wear resistance of the throttle element. Description of the Drawings

[0024] Figure 1 Axial sectional view of the wedge-type streamline anti-blocking and wear-resistant flow detection device for Embodiment 1;

[0025] Figure 2Radial sectional view of the wedge-shaped streamlined anti-blocking and wear-resistant flow detection device of Embodiment 1;

[0026] Figure 3 Axial sectional view of the wedge-shaped streamlined anti-blocking and wear-resistant flow detection device of Embodiment 2;

[0027] Figure 4 Radial sectional view of the wedge-shaped streamlined anti-blocking and wear-resistant flow detection device of Embodiment 2.

[0028] In the figure: measuring piece 1, measuring tube 11, flange 12, positive and negative pressure tapping holes 13, positive pressure tapping pipe 14, negative pressure tapping pipe 15; throttling piece 2, semi-elliptical wedge-shaped throttling element 21, asymmetric fish-tail streamlined throttling element 22, streamlined part 221, fish-tail part 222, cavity 23, threaded hole 24, bolt hole 25, bolt 26, annular sealing ring 27, boss 28. Specific implementation manners

[0029] In order to make the technical solution of the present utility model easier to understand, the technical solution of the present utility model will be clearly and completely described below by way of specific embodiments in conjunction with the accompanying drawings.

[0030] Embodiment 1:

[0031] As Figures 1 to 2 shown, the wedge-shaped streamlined anti-blocking and wear-resistant flow detection device of this embodiment includes a measuring piece 1 and a throttling piece 2, wherein:

[0032] The measuring piece 1 includes a measuring tube 11. Flanges 12 are respectively provided at both ends of the measuring tube 11. Positive and negative pressure tapping holes 13 are opened on the upper wall of the measuring tube 11. The positive pressure tapping pipe 14 and the negative pressure tapping pipe 15 are respectively installed on the outer side of the upper part of the wall of the measuring tube 11, and their inner holes communicate with the inner cavity of the measuring tube 11 through the positive and negative pressure tapping holes on the tube wall;

[0033] The throttling piece 2 includes a semi-elliptical wedge-shaped throttling element 21 and an asymmetric fish-tail streamlined throttling element 22. The semi-elliptical wedge-shaped throttling element 21 is installed inside the upper part of the measuring tube 11, and a cavity 23 is provided inside it. The asymmetric fish-tail streamlined throttling element 22 is installed inside the lower part of the measuring tube 11, and it is symmetrically arranged with the semi-elliptical wedge-shaped throttling element 21 through the axis of the measuring tube 11.

[0034] The semi-elliptical wedge-shaped throttling element 21 and the asymmetric fish-tail streamlined throttling element 22 are welded and connected inside the measuring tube 11.

[0035] Embodiment 2:

[0036] As Figures 3 to 4 shown, the wedge-shaped streamlined anti-blocking and wear-resistant flow detection device of this embodiment includes a measuring piece 1 and a throttling piece 2, wherein:

[0037] The measuring member 1 includes a measuring tube 11, and flanges 12 are respectively provided at both ends of the measuring tube 11. Positive and negative pressure tapping holes 13 are formed in the upper pipe wall of the measuring tube 11. A positive pressure tapping pipe 14 and a negative pressure tapping pipe 15 are respectively installed on the outer side of the upper part of the wall of the measuring tube 11, and their inner holes communicate with the inner cavity of the measuring tube 11 through the positive and negative pressure tapping holes 13 on the pipe wall.

[0038] The throttling member 2 includes a semi-elliptical wedge-shaped throttling element 21 and an asymmetric fish-tail streamline-shaped throttling element 22. The semi-elliptical wedge-shaped throttling element 21 is installed inside the upper part of the measuring tube 11, and a cavity 23 is provided inside it. The asymmetric fish-tail streamline-shaped throttling element 22 is installed inside the lower part of the measuring tube 11, and it is symmetrically arranged with the semi-elliptical wedge-shaped throttling element 21 through the axis of the measuring tube 11.

[0039] The lower vertex of the semi-elliptical wedge-shaped throttling element 21 and the upper vertex of the asymmetric fish-tail streamline-shaped throttling element 22 are on the same diameter line of the measuring tube 11.

[0040] The distance between the upper vertex of the asymmetric fish-tail streamline-shaped throttling element 22 and the lowest point of the inner wall of the measuring tube 11 does not exceed 30 millimeters.

[0041] Upstream of the asymmetric fish-tail streamline-shaped throttling element 22 is a streamline part 221, and downstream of it is a fish-tail part 222. The curve of the streamline part 221 is convex upward, and the curve of the fish-tail part 222 is concave downward. And the transition angle between the streamline part 221 and the fish-tail part 222 relative to the lower pipe wall of the measuring tube 11 is within 10°.

[0042] The surfaces of the semi-elliptical wedge-shaped throttling element 21 and the asymmetric fish-tail streamline-shaped throttling element 22 are evenly sprayed with a wear-resistant layer, and the wear-resistant layer is an STL alloy.

[0043] The semi-elliptical wedge-shaped throttling element 21 and the asymmetric fish-tail streamline-shaped throttling element 22 are bolted inside the measuring tube 11. The detachable connection method is convenient for cleaning or replacing the semi-elliptical wedge-shaped throttling element 21 and the asymmetric fish-tail streamline-shaped throttling element 22.

[0044] Non-through threaded holes 24 are provided on the semi-elliptical wedge-shaped throttling element 21 and the asymmetric fish-tail streamline-shaped throttling element 22, and bolt holes 25 are provided on the measuring tube 11. Bolts 26 are fitted into the bolt holes 25 and the threaded holes 24.

[0045] Annular sealing rings 27 are respectively provided at the contact positions between the semi-elliptical wedge-shaped throttling element 21 and the asymmetric fish-tail streamline-shaped throttling element 22 and the measuring tube 11.

[0046] A boss 28 is provided inside the cavity 23 of the semi-elliptical wedge-shaped throttling element 21, and the threaded hole 24 is provided on the boss 28.

[0047] It should be noted that the embodiments described herein are only partial embodiments of the present utility model, rather than all implementation manners of the present utility model. The embodiments are only exemplary, and their functions are only to provide a more intuitive and clear way to understand the content of the present utility model, rather than a limitation on the technical solutions described in the present utility model. Without departing from the concept of the present utility model, all other implementation manners that can be thought of by those of ordinary skill in the art without creative efforts, as well as other simple substitutions and various changes to the technical solutions of the present utility model, all fall within the protection scope of the present utility model.

Claims

1. A wedge-shaped streamline anti-blocking and wear-resistant flow detection device, characterized in that, It includes a measuring element (1) and a throttling element (2), where: The measuring element (1) includes a measuring tube (11). Flanges (12) are provided at both ends of the measuring tube (11). Positive and negative pressure tapping holes (13) are opened on the upper tube wall of the measuring tube (11). A positive pressure tapping pipe (14) and a negative pressure tapping pipe (15) are respectively installed on the outer side of the upper part of the wall of the measuring tube (11), and their inner holes communicate with the inner cavity of the measuring tube (11) through the positive and negative pressure tapping holes (13) on the tube wall. The throttling element (2) includes a semi-elliptical wedge-shaped throttling element (21) and an asymmetric fish-tail streamline-shaped throttling element (22). The semi-elliptical wedge-shaped throttling element (21) is installed inside the upper part of the measuring tube (11), and a cavity (23) is provided inside it. The asymmetric fish-tail streamline-shaped throttling element (22) is installed inside the lower part of the measuring tube (11), and it is symmetrically arranged with the semi-elliptical wedge-shaped throttling element (21) through the axis of the measuring tube (11).

2. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 1, characterized in that, The lower vertex of the semi-elliptical wedge-shaped throttling element (21) and the upper vertex of the asymmetric fish-tail streamline-shaped throttling element (22) are on the same diameter line of the measuring tube (11).

3. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 1, characterized in that, The distance between the upper vertex of the asymmetric fish-tail streamline-shaped throttling element (22) and the lowest point of the inner wall of the measuring tube (11) does not exceed 30 millimeters.

4. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 1, wherein, The upstream of the asymmetric fish-tail streamline-shaped throttling element (22) is a streamline part (221), and its downstream is a fish-tail part (222). The curve of the streamline part (221) is convex upward, and the curve of the fish-tail part (222) is concave downward. And the transition angle between the streamline part (221) and the fish-tail part (222) relative to the lower tube wall of the measuring tube (11) is within 10°.

5. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 1, characterized in that, The surfaces of the semi-elliptical wedge-shaped throttling element (21) and the asymmetric fish-tail streamline-shaped throttling element (22) are evenly sprayed with a wear-resistant layer, and the wear-resistant layer is an STL alloy.

6. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 1, characterized in that, The semi-elliptical wedge-shaped throttling element (21) and the asymmetric fish-tail streamline-shaped throttling element (22) are fixedly connected or detachably connected inside the measuring tube (11).

7. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 6, wherein The fixed connection is welding.

8. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 6, characterized in that, The detachable connection is bolt connection. Non-through threaded holes (24) are provided on the semi-elliptical wedge-shaped throttling element (21) and the asymmetric fish-tail streamline-shaped throttling element (22), and bolt holes (25) are provided on the measuring tube (11). Bolts (26) are fitted into the bolt holes (25) and the threaded holes (24).

9. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 8, characterized in that, Annular sealing rings (27) are respectively provided at the contact positions between the semi-elliptical wedge-shaped throttling element (21) and the asymmetric fish-tail streamline-shaped throttling element (22) and the measuring tube (11).

10. The wedge-shaped streamlined anti-blocking and wear-resistant flow detection device according to claim 8, characterized in that, A boss (28) is provided inside the cavity (23) of the semi-elliptical wedge-shaped throttling element (21), and the threaded hole (24) is provided on the boss (28).

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