Liquid level transmitter anti-bubble interference device

Abstract

The present invention relates to a device for preventing bubble interference in a liquid level transmitter, which includes a pressure lead-out pipe for connecting the liquid level transmitter and a liquid storage tank. The pressure lead-out pipe comprises a first pipe section and a second pipe section; the second pipe section is arranged to be inclined upward relative to the horizontal direction; one end of the first pipe section is connected to the lower end of the second pipe section, and the first pipe section is arranged to be inclined upward in the opposite direction relative to the second pipe section; the other end of the first pipe section communicates with the liquid storage tank; the end of the second pipe section far from the first pipe section is connected to the liquid level transmitter. The device for preventing bubble interference in the liquid level transmitter designed by the present invention, through the design of introducing the first pipe section with reverse inclination, realizes the purpose of efficiently separating bubbles only by relying on the physical properties of the fluid itself without any external energy drive or the intervention of a complex control system, reduces the accumulation of bubbles in the pressure lead-out pipe from the source, and greatly improves the accuracy and stability of liquid level measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level transmitters, and in particular to an anti-bubble interference device for a liquid level transmitter. Background Art

[0002] Liquid level measurement is crucial in industrial production, especially in liquid storage tanks and reactors in industries such as chemical engineering, petroleum, and environmental protection. The accurate measurement of the liquid level directly relates to the precision of process control and the safety of production. As a commonly used liquid level measurement instrument, the measurement accuracy and stability of a liquid level transmitter directly affect the efficiency and safety of the production process.

[0003] Currently, most common liquid level transmitters on the market measure the liquid level based on the hydrostatic pressure principle. Its basic principle is to calculate the liquid level height by measuring the hydrostatic pressure generated by the liquid. However, in practical applications, especially in some complex working conditions, such as:

[0004] Liquids containing suspended solids: Bubbles are prone to attach to the suspended solids, forming larger bubble clusters. These bubble clusters change the liquid hydrostatic pressure, resulting in errors in liquid level measurement, forming the so-called "false liquid level" and causing the measurement result to deviate from the actual value.

[0005] Stirred or oscillated liquids: Bubbles are more likely to be generated inside the liquid. If these bubbles enter the pressure lead-out pipe of the liquid level transmitter and accumulate at the pressure measuring diaphragm, after accumulating to a certain extent, the bubbles often enter the pressure measuring diaphragm of the liquid level transmitter along the pipeline and accumulate, interfering with the pressure sensor. In this case, it will interfere with the pressure sensor, resulting in inaccurate measurement results. In severe cases, it may even cause the equipment to malfunction.

[0006] Therefore, how to effectively solve the interference of bubbles on liquid level measurement is an urgent problem to be solved in the current liquid level measurement technology field. Summary of the Invention

[0007] To solve the above problems, the present invention provides an anti-bubble interference device for a liquid level transmitter that can effectively reduce bubble interference without complex measures and significantly improve the accuracy and reliability of liquid level measurement.

[0008] To achieve the above object, the anti-bubble interference device for a liquid level transmitter designed by the present invention includes a pressure extraction pipe for connecting the liquid level transmitter and the liquid storage tank. The pressure extraction pipe includes a first pipe section and a second pipe section. The second pipe section is arranged obliquely upward with respect to the horizontal direction. One end of the first pipe section is connected to the lower end of the second pipe section, and the first pipe section is arranged obliquely upward in the opposite direction with respect to the second pipe section. The other end of the first pipe section communicates with the liquid storage tank. The end of the second pipe section far from the first pipe section is connected to the liquid level transmitter. The connection between the first pipe section and the liquid storage tank is smoothly transitioned, and the height of this connection is lower than the installation position height of the liquid level transmitter.

[0009] Preferably, the included angle α between the first pipe section and the horizontal direction is 18 - 22°.

[0010] Preferably, the first pipe section is in a trumpet shape, and its radial cross-sectional area gradually increases from the end connected to the second pipe section to the end connected to the liquid storage tank.

[0011] Preferably, it further includes an installation flange for connecting the first pipe section to the liquid storage tank. The installation flange is fixed on the side wall of the liquid storage tank and is located near the bottom of the liquid storage tank.

[0012] Preferably, the connections between the first pipe section and the second pipe section and between the first pipe section and the liquid storage tank are both arc-shaped transitions.

[0013] Preferably, the pressure extraction pipe further includes a horizontally arranged third pipe section, and the third pipe section is connected between the first pipe section and the second pipe section.

[0014] Preferably, the pressure extraction pipe further includes a fourth pipe section, and the fourth pipe section is a flexible and bendable connecting pipe connected between the third pipe section and the second pipe section.

[0015] Preferably, the fourth pipe section is a telescopic corrugated pipe with a corrugated structure.

[0016] Preferably, hydrophilic capillary whiskers are provided on the inner wall of the telescopic folds of the fourth pipe section.

[0017] The anti-bubble interference device for liquid level transmitters designed in the present invention achieves the purpose of efficiently separating bubbles only relying on the physical properties of the fluid itself without any external energy drive or the intervention of a complex control system through the design of introducing a first pipe section with a reverse inclination. This simple and ingenious design abandons the traditional and complex exhaust mechanisms or defoaming measures, enabling the bubbles entering the pressure lead-out pipe to automatically and smoothly return to the liquid storage tank. This not only reduces the accumulation of bubbles in the pressure lead-out pipe from the source but also avoids the direct interference of bubbles on the pressure sensor, thereby greatly improving the accuracy and stability of liquid level measurement, while also reducing the equipment cost and maintenance difficulty. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the anti-bubble interference device for liquid level transmitters provided by an embodiment of the present application.

[0019] Figure 2 It is a schematic structural diagram of the anti-bubble interference device for liquid level transmitters provided by another embodiment of the present application.

[0020] Wherein: liquid level transmitter 100, liquid storage tank 200, pressure lead-out pipe 10, first pipe section 11, second pipe section 12, third pipe section 13, fourth pipe section 14, mounting flange 20. Detailed Embodiments

[0021] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention and are not used to limit the present invention.

[0022] The anti-bubble interference device for liquid level transmitters described in this embodiment is mainly applied to the liquid level measurement of liquid storage tanks in industries such as chemical engineering, petroleum, and environmental protection to solve the problem that the measurement results are inaccurate due to bubbles entering the pressure lead-out pipe and interfering with the pressure sensor when traditional liquid level transmitters measure liquids containing bubbles.

[0023] Such as Figure 1As shown in the figure, the anti-bubble interference device for a liquid level transmitter described in this embodiment includes a pressure extraction pipe 10 for connecting the liquid level transmitter 100 and the liquid storage tank 200. The pressure extraction pipe 10 includes a first pipe section 11 and a second pipe section 12. The second pipe section 12 is arranged obliquely upward relative to the horizontal direction. One end of the first pipe section 11 is connected to the lower end of the second pipe section 12, and the first pipe section 11 is arranged obliquely upward in the opposite direction to the second pipe section 12. The other end of the first pipe section 11 communicates with the liquid storage tank 200. The end of the second pipe section 12 away from the first pipe section 11 is connected to the liquid level transmitter 100. The connection between the first pipe section 11 and the liquid storage tank 200 has a smooth transition, and the height of this connection is lower than the installation position height of the liquid level transmitter 100.

[0024] During use, the liquid pressure in the liquid storage tank 200 is transmitted to the liquid level transmitter 100 through the pressure extraction pipe 10 for accurately measuring the liquid level height. When the liquid in the liquid storage tank 200 contains bubbles, these bubbles will enter the first pipe section 11 of the pressure extraction pipe 10 together with the liquid. Due to the reverse inclination design of the first pipe section 11 relative to the second pipe section 12, when the bubbles rise in the first pipe section 11 under the action of buoyancy, they are more likely to be guided back to the liquid storage tank 200. More importantly, this reverse upward inclination design ingeniously makes it difficult for the bubbles that have floated to the upper end of the first pipe section 11 to enter the second pipe section 12, thus effectively preventing the bubbles from entering the pressure sensing diaphragm of the liquid level transmitter 100, avoiding the interference of the bubbles on the pressure sensor, ensuring the accuracy of the liquid level measurement, and further improving the reliability of the measurement result. In addition, the second pipe section 12 is arranged obliquely upward relative to the horizontal direction, which can effectively prevent the possible solid deposits in the liquid storage tank 200 from entering the pressure extraction pipe 10 and avoid the risk of blockage.

[0025] In some embodiments, as Figure 1 shown, the included angle α between the first pipe section 11 and the horizontal direction is 18 - 22°. During specific implementation, for example, the included angle α can be 18°, 19°, 20°, 21°, or 22°. In a preferred embodiment, the included angle α between the first pipe section 11 and the horizontal direction is 20°. This angle can enable the bubbles to move smoothly upward under the action of buoyancy without causing excessive accumulation of the bubbles in the first pipe section 11, but making it easier for them to be guided back to the liquid storage tank 200.

[0026] In some embodiments, as Figure 1As shown, the first pipe section 11 is trumpet-shaped, and the radial cross-sectional area thereof gradually increases from the end connected to the second pipe section 12 to the end connected to the liquid storage tank 200. With this trumpet-shaped structure design, the pipe diameter of the first pipe section 11 gradually increases from the second pipe section 12 towards the liquid storage tank 200, which helps to reduce the deposition of solid suspended matter in the liquid in the pipe section. Even if a small amount of solid particles deposit due to inertia, as the pipe diameter of the first pipe section 11 increases, these deposits are more likely to return to the liquid storage tank 200 under their own weight, thereby reducing the risk of blockage.

[0027] In some embodiments, as Figure 1 shown, it further includes a mounting flange 20 for connecting the first pipe section 11 to the liquid storage tank 200. The mounting flange 20 is fixed on the side wall of the liquid storage tank 200 and is located near the bottom of the liquid storage tank 200. In this embodiment, by adopting the mounting flange 20, the connection between the first pipe section 11 and the liquid storage tank 200 becomes very stable and reliable. Even under the condition of liquid pressure fluctuation in the storage tank or external vibration, this connection can remain stable and will not become loose or leak. At the same time, the design of the mounting flange 20 makes the installation and disassembly of the first pipe section 11 very convenient, facilitating daily maintenance and repair. In addition, the position of the mounting flange 20 near the bottom of the tank is also beneficial to empty the liquid in the storage tank, reducing the measurement error.

[0028] In some embodiments, the joints between the first pipe section 11 and the second pipe section 12 and between the first pipe section 11 and the liquid storage tank 200 are both arc transitions. The arc transition can avoid the appearance of acute angles or right angles at the joints, making the flow of liquid and bubbles smoother and reducing the possibility of bubble attachment and accumulation.

[0029] In some embodiments, as Figure 1 shown, the pressure extraction pipe 10 further includes a horizontally arranged third pipe section 13, and the third pipe section 13 is connected between the first pipe section 11 and the second pipe section 12. In this embodiment, the addition of the third pipe section 13 can extend the movement path of the bubbles before reaching the second pipe section 12, enabling the bubbles to have more sufficient time to float upward under the action of buoyancy and return to the liquid storage tank 200.

[0030] In some embodiments, as Figure 1As shown, the pressure extraction pipe 10 further includes a fourth pipe section 14, and the fourth pipe section 14 is a flexible and bendable connecting pipe connected between the third pipe section 13 and the second pipe section 12. In actual industrial applications, such as in large reactors or mixing tanks, due to reasons such as changes in the temperature of the tank body, the operation of the agitator, and foundation settlement, there is often a certain relative displacement or vibration between the liquid level transmitter 100 and the pressure extraction pipe 10. By using a flexible and bendable connecting pipe, such as a corrugated pipe, as the fourth pipe section 14, the vibration of the pipeline can be absorbed, and the installation error can be compensated, so that the entire pressure extraction pipe 10 can operate more stably and reliably. For example, when the tank body expands or contracts due to temperature changes, the flexible connecting pipe can bend flexibly without generating additional stress on the liquid level transmitter 100 or other parts of the pressure extraction pipe 10. In addition, during installation, the user can conveniently adjust the installation angle and position of the second pipe section 12 by bending the flexible connecting pipe, so that the liquid level transmitter 100 can be installed at the most suitable position.

[0031] In some embodiments, as Figure 2 shown, the fourth pipe section 14 is a telescopic corrugated pipe with a corrugated structure. Specifically, hydrophilic capillary whiskers are provided on the inner wall of the telescopic folds of the fourth pipe section 14. In some extreme working conditions, for example, when the liquid in the liquid storage tank 200 undergoes violent oscillation, a small amount of air bubbles may enter the fourth pipe section 14. At this time, these hydrophilic capillary whiskers can effectively adsorb and fix these air bubbles on the pipe wall, forming a firm adhesion, preventing the air bubbles from further entering the second pipe section 12, thereby avoiding the accumulation of air bubbles at the pressure measuring diaphragm of the liquid level transmitter 100, effectively reducing the interference of air bubbles on the measurement result; at the same time, the capillary whiskers can also prevent the aggregation of small air bubbles to form larger air bubbles, more thoroughly eliminating the air bubble interference and improving the accuracy of liquid level measurement. In addition, during daily maintenance and repair, the fourth pipe section 14 can be manually tapped to make the air bubbles that may be captured by the capillary whiskers break away, enter the liquid level transmitter 100 through the second pipe section 12, and then, the pressure sensing diaphragm of the liquid level transmitter 100 can be adjusted to release the air bubbles that may have accumulated, so as to quickly eliminate the residual influence caused by extreme working conditions and ensure the long-term stability and measurement accuracy of the system.

[0032] The anti-bubble interference device for the liquid level transmitter provided in this embodiment realizes the purpose of efficiently separating bubbles only relying on the physical properties of the fluid itself without any external energy drive or the intervention of a complex control system through the design of introducing a first pipe section with a reverse inclination. This simple and ingenious design abandons the traditional and complex exhaust mechanisms or defoaming measures, enabling the bubbles entering the pressure lead-out pipe to automatically and smoothly return to the liquid storage tank. This not only reduces the accumulation of bubbles in the pressure lead-out pipe from the source but also avoids the direct interference of bubbles on the pressure sensor, thereby greatly improving the accuracy and stability of liquid level measurement. At the same time, it also reduces the equipment cost and maintenance difficulty.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" 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, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid level transmitter anti-bubble interference device, characterized in that: It comprises a pressure outlet pipe for connecting a liquid level transmitter and a liquid storage tank, the pressure outlet pipe comprises a first pipe section and a second pipe section; the second pipe section is arranged to be inclined upward relative to the horizontal direction; one end of the first pipe section is connected to the lower end of the second pipe section, and the first pipe section is arranged to be inclined upward in the opposite direction relative to the second pipe section; the other end of the first pipe section is connected to the liquid storage tank; the end of the second pipe section away from the first pipe section is connected to the liquid level transmitter; the connection between the first pipe section and the liquid storage tank has a smooth transition, and the height of the connection is lower than the installation position height of the liquid level transmitter; the pressure outlet pipe also comprises a third pipe section arranged horizontally, the third pipe section is connected between the first pipe section and the second pipe section; the pressure outlet pipe also comprises a fourth pipe section, the fourth pipe section is connected to the flexible and bendable connecting pipe between the third pipe section and the second pipe section.

2. The anti-bubble interference device for liquid level transmitter according to claim 1 is characterized in that: The angle α at which the first pipe section is inclined upward relative to the horizontal direction is 18-22°.

3. The anti-bubble interference device for liquid level transmitter according to claim 1, characterized in that: The first pipe section is trumpet-shaped, and its radial cross-sectional area gradually increases from the end connected to the second pipe section to the end connected to the liquid storage tank.

4. The anti-bubble interference device for liquid level transmitter according to claim 1, characterized in that: It also includes a mounting flange for connecting the first pipe section to the liquid storage tank, wherein the mounting flange is fixed on the side wall of the liquid storage tank and is located close to the bottom of the liquid storage tank.

5. The anti-bubble interference device for liquid level transmitter according to claim 1, characterized in that: The connection between the first pipe section and the second pipe section and the connection between the first pipe section and the liquid storage tank are both arc transitions.

6. The anti-bubble interference device for liquid level transmitter according to claim 1, characterized in that: The fourth pipe section is a retractable bellows having a corrugated structure.

7. The anti-bubble interference device for liquid level transmitter according to claim 6, characterized in that: The inner tube wall of the telescopic folds of the fourth tube section is provided with hydrophilic capillary whiskers.

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