Bubble interference prevention device for liquid level transmitter

Abstract

The invention relates to a bubble interference prevention device for a liquid level transmitter, which comprises a pressure outlet pipe used for connecting the liquid level transmitter and a liquid storage tank, and the pressure outlet pipe comprises a first pipe section and a second pipe section; the second pipe section is obliquely arranged upwards relative to the horizontal direction; one end of the first pipe section is connected with the lower end of the second pipe section, and the first pipe section is reversely and obliquely arranged upwards relative to the second pipe section; the other end of the first pipe section is communicated with the liquid storage tank; the end, away from the first pipe section, of the second pipe section is connected with the liquid level transmitter. According to the bubble interference prevention device for the liquid level transmitter, through the design of introducing the first pipe section which is reversely inclined, the purpose of efficiently separating bubbles only depending on the physical characteristics of fluid under the condition that no external energy source drive or complex control system intervention is needed is achieved, and the bubble interference prevention device for the liquid level transmitter has the advantages of being simple in structure and convenient to use. The accumulation of bubbles in the pressure outlet pipe is reduced from the source, and the precision and stability of liquid level measurement are greatly improved.

Description

Technical Field

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

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

[0003] At present, most of the common liquid level transmitters on the market are based on the principle of static pressure for liquid level measurement. The basic principle is to calculate the liquid level by measuring the static pressure generated by the liquid. However, in practical applications, especially in some complex working conditions, such as: Liquids containing suspended matter: Bubbles tend to attach to the suspended matter to form larger bubble clusters. These bubble clusters change the static pressure of the liquid, which leads to errors in the liquid level measurement, forming the so-called "false liquid level" and causing the measurement results to deviate from the actual value.

[0004] Stirred or oscillating liquid: It is easier for bubbles to form inside the liquid. If these bubbles enter the pressure outlet pipe of the level transmitter and gather at the pressure measuring diaphragm, after accumulating to a certain extent, the bubbles will often enter the pressure measuring diaphragm of the level transmitter along the pipe and accumulate, causing interference to the pressure sensor. In this case, it will interfere with the pressure sensor, resulting in inaccurate measurement results, and in severe cases, it will even cause the equipment to fail to work properly.

[0005] Therefore, how to effectively solve the interference of bubbles on liquid level measurement is an urgent problem to be solved in the current field of liquid level measurement technology. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a liquid level transmitter anti-bubble interference device which can effectively reduce bubble interference without complicated measures and significantly improve the accuracy and reliability of liquid level measurement.

[0007] In order to achieve the above-mentioned purpose, the liquid level transmitter anti-bubble interference device designed by the present invention includes a pressure lead-out pipe for connecting the liquid level transmitter and the liquid storage tank, and the pressure lead-out pipe includes 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.

[0008] Preferably, the angle α at which the first pipe section is inclined upward relative to the horizontal direction is 18-22°.

[0009] Preferably, 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.

[0010] Preferably, it further comprises 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.

[0011] Preferably, 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.

[0012] Preferably, the pressure outlet pipe further includes a third pipe section arranged horizontally, and the third pipe section is connected between the first pipe section and the second pipe section.

[0013] Preferably, the pressure outlet pipe further includes a fourth pipe segment, and the fourth pipe segment is connected to the flexible and bendable connecting pipe between the third pipe segment and the second pipe segment.

[0014] Preferably, the fourth pipe section is a retractable bellows having a corrugated structure.

[0015] Preferably, hydrophilic capillary whiskers are arranged on the inner tube wall of the telescopic folds of the fourth tube section.

[0016] The anti-bubble interference device for the liquid level transmitter designed in the present invention achieves the purpose of efficiently separating bubbles by relying solely on the physical properties of the fluid itself without the need for any external energy drive or complex control system intervention by introducing a reversely inclined first pipe section. This simple and ingenious design abandons the traditional and complex exhaust mechanism or defoaming measures, so that the bubbles entering the pressure outlet pipe can automatically and smoothly return to the liquid storage tank, which not only reduces the accumulation of bubbles in the pressure outlet pipe from the source, but also avoids the direct interference of bubbles to the pressure sensor, thereby greatly improving the accuracy and stability of liquid level measurement, while also reducing equipment costs and maintenance difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the anti-bubble interference device of the liquid level transmitter provided in an embodiment of the present application.

[0018] Figure 2 It is a schematic structural diagram of a liquid level transmitter anti-bubble interference device provided in another embodiment of the present application.

[0019] Among them: a liquid level transmitter 100 , a liquid storage tank 200 , a pressure outlet pipe 10 , a first pipe section 11 , a second pipe section 12 , a third pipe section 13 , a fourth pipe section 14 , and a mounting flange 20 . DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] The liquid level transmitter anti-bubble interference device described in this embodiment is mainly used in liquid level measurement of liquid storage tanks in the chemical, petroleum, environmental protection and other industries. It is used to solve the problem that when a traditional liquid level transmitter measures liquids containing bubbles, the bubbles enter the pressure outlet pipe and interfere with the pressure sensor, resulting in inaccurate measurement results.

[0022] like Figure 1As shown, the anti-bubble interference device of the liquid level transmitter described in this embodiment includes a pressure outlet pipe 10 for connecting the liquid level transmitter 100 and the liquid storage tank 200, and the pressure outlet pipe 10 includes a first pipe section 11 and a second pipe section 12; the second pipe section 12 is arranged to be inclined 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 to be inclined upward in the opposite direction relative to the second pipe section 12; the other end of the first pipe section 11 is connected to 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 the connection is lower than the installation position height of the liquid level transmitter 100.

[0023] During use, the liquid pressure in the liquid storage tank 200 is transmitted to the liquid level transmitter 100 through the pressure outlet pipe 10 for accurate measurement of 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 outlet pipe 10 together with the liquid. Since the first pipe section 11 adopts a reverse tilt design relative to the second pipe section 12, the bubbles are more easily guided back to the liquid storage tank 200 during the process of rising in the first pipe section 11 under the action of buoyancy. More importantly, this reverse upward tilt design cleverly makes it difficult for bubbles that have floated to the upper end of the first pipe section 11 to enter the second pipe section 12, thereby effectively preventing bubbles from entering the pressure-sensitive diaphragm of the liquid level transmitter 100, avoiding the interference of bubbles on the pressure sensor, ensuring the accuracy of the liquid level measurement, and thus improving the reliability of the measurement results. In addition, the second pipe section 12 is tilted upward relative to the horizontal direction, which can effectively prevent solid sediments that may exist in the liquid storage tank 200 from entering the pressure outlet pipe 10, avoiding the risk of blockage.

[0024] In some embodiments, Figure 1 As shown, the angle α of the first pipe section 11 tilted upward relative to the horizontal direction is 18-22°. In specific implementation, for example, the angle α can be 18°, 19°, 20°, 21° or 22°. In a preferred embodiment, the angle α between the first pipe section 11 and the horizontal direction is 20°. This angle can make the bubbles move upward smoothly under the action of buoyancy, and will not cause excessive accumulation of bubbles in the first pipe section 11, but make it easier to be guided back to the liquid storage tank 200.

[0025] In some embodiments, Figure 1As shown, the first pipe section 11 is trumpet-shaped, and its radial cross-sectional area 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 structural design, the diameter of the first pipe section 11 gradually increases from the second pipe section 12 to 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 are deposited due to inertia, as the diameter of the first pipe section 11 increases, these sediments are more likely to return to the liquid storage tank 200 under their own weight, thereby reducing the risk of blockage.

[0026] In some embodiments, Figure 1 As shown, it also includes a mounting flange 20 for connecting the first pipe section 11 to the liquid storage tank 200, and 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 if the liquid pressure in the storage tank fluctuates or is subjected to external vibration, the connection can remain stable without loosening or leakage. At the same time, the design of the mounting flange 20 makes the installation and removal of the first pipe section 11 very convenient, which is convenient for daily maintenance and overhaul. In addition, the position of the mounting flange 20 close to the bottom of the tank is also conducive to emptying the liquid in the storage tank, reducing measurement errors.

[0027] In some embodiments, the connection between the first pipe section 11 and the second pipe section 12 and the connection between the first pipe section 11 and the liquid storage tank 200 are both arc transitions. The arc transition can avoid sharp angles or right angles at the connection, making the flow of liquid and bubbles smoother and reducing the possibility of bubble attachment and accumulation.

[0028] In some embodiments, Figure 1 As shown, the pressure outlet pipe 10 further includes a third pipe section 13 arranged horizontally, 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, so that the bubbles have more sufficient time to float up and return to the liquid storage tank 200 under the action of buoyancy.

[0029] In some embodiments, Figure 1As shown, the pressure outlet pipe 10 also includes a fourth pipe section 14, which 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 a large reactor or a stirring tank, due to the temperature change of the tank body, the operation of the agitator, and the settlement of the foundation, there is often a certain relative displacement or vibration between the liquid level transmitter 100 and the pressure outlet pipe 10. The use of a flexible and bendable connecting pipe, such as a bellows as the fourth pipe section 14 can absorb the vibration of the pipeline and compensate for the installation error, so that the entire pressure outlet 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 be flexibly bent without generating additional stress on the liquid level transmitter 100 or other parts of the pressure outlet 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 in the most suitable position.

[0030] In some embodiments, Figure 2 As shown, the fourth pipe section 14 is a retractable bellows with a corrugated structure. In specific implementation, hydrophilic capillary whiskers are provided on the inner tube wall of the telescopic folds of the fourth pipe section 14. Under some extreme working conditions, such as when the liquid in the liquid storage tank 200 vibrates violently, a small amount of bubbles may enter the fourth pipe section 14. At this time, these hydrophilic capillary whiskers can effectively adsorb and fix these bubbles on the tube wall, forming a firm attachment to prevent the bubbles from further entering the second pipe section 12, thereby avoiding the accumulation of bubbles at the pressure measuring diaphragm of the liquid level transmitter 100, effectively reducing the interference of bubbles on the measurement results; at the same time, the capillary whiskers can also prevent small bubbles from agglomerating to form larger bubbles, more thoroughly eliminating the interference of bubbles and improving the accuracy of liquid level measurement. In addition, during routine maintenance and inspection, the fourth pipe section 14 can be manually tapped to disengage bubbles that may be captured by the capillary whiskers and enter the liquid level transmitter 100 through the second pipe section 12. Then, the pressure-sensitive diaphragm of the liquid level transmitter 100 can be adjusted to release bubbles that may have accumulated, thereby quickly eliminating residual effects caused by extreme operating conditions and ensuring the long-term stability and measurement accuracy of the system.

[0031] The anti-bubble interference device for the liquid level transmitter provided in this embodiment achieves the purpose of efficiently separating bubbles by relying solely on the physical properties of the fluid itself without the need for any external energy drive or complex control system intervention by introducing the design of a reversely inclined first pipe section. This simple and ingenious design abandons the traditional, complex exhaust mechanism or defoaming measures, so that the bubbles entering the pressure outlet pipe can automatically and smoothly return to the liquid storage tank, which not only reduces the accumulation of bubbles in the pressure outlet pipe from the source, but also avoids direct interference of bubbles to the pressure sensor, thereby greatly improving the accuracy and stability of liquid level measurement, while also reducing equipment costs and maintenance difficulties.

[0032] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, 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 communicated with 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.

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 pressure outlet pipe also includes a third pipe section arranged horizontally, and the third pipe section is connected between the first pipe section and the second pipe section.

7. The anti-bubble interference device for liquid level transmitter according to claim 6, characterized in that: The pressure outlet pipe also includes a fourth pipe section, and the fourth pipe section is connected to the flexible and bendable connecting pipe between the third pipe section and the second pipe section.

8. The anti-bubble interference device for liquid level transmitter according to claim 7, characterized in that: The fourth pipe section is a retractable bellows with a corrugated structure.

9. The anti-bubble interference device for liquid level transmitter according to claim 8, 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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