High-precision differential pressure liquid level measuring device for measuring density on line

Abstract

The utility model belongs to the technical field of liquid level measurement, and discloses a high-precision differential pressure liquid level measuring device for on-line density measurement, which is used for measuring the liquid level of liquid to be measured in a container and comprises a measuring component mounted in the container and a PLC (programmable logic controller) system connected with the measuring component, and the measuring component comprises a first pressure measuring unit, a second pressure measuring unit and a densimeter. The first pressure measuring unit is configured to measure the pressure of a first measuring point in the container, the second pressure measuring unit is configured to measure the pressure of a second measuring point in the container, the first measuring point and the second measuring point are spaced in the height direction, and furthermore, the densimeter is mounted at an inlet of the container; the density measuring device is configured to measure the density of liquid entering the container in real time, then the average density of the liquid to be measured in the container is obtained in real time through the PLC system, density data are corrected in real time, and the accuracy of liquid level measurement is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level measurement, in particular to a high-precision differential pressure liquid level measurement device for online density measurement. Background Technique

[0002] Liquids and the air above them will generate pressure on two measurement points, and the height difference of the liquid surface will cause a pressure difference between the two measurement points. According to Pascal's law, the pressure of the liquid is proportional to the height of the liquid surface. Therefore, common liquid level measurement devices can calculate the height of the liquid surface by measuring the pressure difference and knowing the density of the medium inside the container.

[0003] In practical applications, the composition of the medium inside the container is usually relatively fixed, so the density value is usually set as a fixed value. Some differential pressure liquid level gauges can also be corrected by accessing pressure and temperature data to further improve the accuracy of the data of the differential pressure liquid level gauge. However, in the case where the composition of the liquid medium is not fixed, such as in a triethylene glycol dehydration and regeneration device, etc., since the density of the medium cannot be accurately determined, it seriously affects the measurement accuracy of the liquid level. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-precision differential pressure liquid level measurement device for online density measurement, which can accurately measure the liquid level.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A high-precision differential pressure liquid level measurement device for online density measurement, used to measure the liquid level of the liquid to be measured in a container, includes:

[0007] A measurement component, the measurement component includes a first pressure measurement unit, a second pressure measurement unit and a densitometer. The first pressure measurement unit is configured to measure the pressure at the first measurement point in the container, the second pressure measurement unit is configured to measure the pressure at the second measurement point in the container. The first measurement point and the second measurement point are arranged at intervals in the height direction. The densitometer is installed at the inlet of the container and is configured to measure the density of the liquid entering the container;

[0008] A PLC system, the PLC is configured to receive the pressure data of the first pressure measurement unit and the second pressure measurement unit, receive the measurement data of the densitometer and correct the density data in real time, and calculate the liquid level of the liquid to be measured in real time.

[0009] Preferably, the first pressure measurement unit includes a first sensor, the first sensor is connected to the PLC system and is configured to measure the pressure at the first measurement point.

[0010] Preferably, a first ball valve is provided between the measuring end and the mounting end of the first sensor, and the first ball valve is opened to measure the pressure at the first measurement point.

[0011] Preferably, the first pressure measuring unit includes a first joint and a first pipe. The first joint is disposed at the first measurement point and communicates with the container. One end of the first joint facing away from the container is circumferentially connected to a first flange plate, and one end of the first pipe is circumferentially connected to a second flange plate. The first flange plate is bolted to the second flange plate, and the first sensor is installed at the other end of the first pipe.

[0012] Preferably, the first pressure measuring unit further includes a first sealing ring, and the first sealing ring is disposed between the first flange plate and the second flange plate.

[0013] Preferably, the first pipe includes a connected first straight pipe and a first elbow. The first sensor is installed at one end of the first straight pipe facing away from the first elbow, and the second flange plate is connected to one end of the first elbow facing away from the first straight pipe.

[0014] Preferably, the second pressure measuring unit includes a second sensor, and the second sensor is connected to the PLC system and is configured to measure the pressure at the second measurement point.

[0015] Preferably, a second ball valve is provided between the measuring end and the mounting end of the second sensor, and the second ball valve is opened to measure the pressure at the second measurement point.

[0016] Preferably, the second pressure measuring unit includes a second joint, a first connecting pipe, a tee joint and a second pipe. The second joint is disposed at the second measurement point and communicates with the container. One end of the second joint facing away from the container is circumferentially connected to a third flange plate, and one end of the first connecting pipe is circumferentially connected to a fourth flange plate. The third flange plate is bolted to the fourth flange plate. The other end of the first connecting pipe is hermetically connected to one interface of the tee joint, the second sensor is hermetically installed at the other interface of the tee joint, one end of the second pipe is blocked, and the other end is hermetically connected to another interface of the tee joint.

[0017] Preferably, the second pressure measuring unit further includes a second sealing ring, and the second sealing ring is disposed between the third flange plate and the fourth flange plate.

[0018] Advantages of the present utility model:

[0019] This embodiment provides a high-precision differential pressure liquid level measuring device for online density measurement, which is used to measure the liquid level of the liquid to be measured in a container. It includes a measuring component installed in the container and a PLC system connected to the measuring component. The measuring component includes a first pressure measuring unit, a second pressure measuring unit and a density meter. The first pressure measuring unit is configured to measure the pressure at the first measuring point in the container, and the second pressure measuring unit is configured to measure the pressure at the second measuring point in the container, where the first measuring point and the second measuring point are spaced apart in the height direction. Further, the density meter is installed at the inlet of the container and is configured to measure the density of the liquid entering the container in real time, and then the average density of the liquid to be measured in the container is obtained in real time through the PLC system, and the density data is corrected in real time to improve the accuracy of liquid level measurement. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a high-precision differential pressure liquid level measuring device for online density measurement provided by an embodiment of the present invention Figure 1 ;

[0021] Figure 2 is a schematic structural diagram of a high-precision differential pressure liquid level measuring device for online density measurement provided by an embodiment of the present invention Figure 2 .

[0022] In the figure:

[0023] 10. Container; 11. First sensor; 12. First joint; 13. First pipeline; 131. First straight pipe; 132. First elbow; 14. First ball valve; 21. Second sensor; 22. First connecting pipe; 23. Three-way; 24. Second pipeline; 25. Second ball valve; 3. Density meter. Detailed Embodiment

[0024] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only the parts related to the present invention are shown in the drawings for the convenience of description, rather than all the structures.

[0025] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 internal communication of two components or the interaction relationship between two components. 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 situations.

[0026] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0027] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] For the existing liquid level measurement devices, in the case where the composition of the liquid medium is not fixed, such as in a triethylene glycol dehydration and regeneration device, etc., since the density of the medium cannot be accurately determined, it seriously affects the measurement accuracy of the liquid level.

[0029] Therefore, this embodiment provides a high-precision differential pressure liquid level measurement device for online density measurement. By detecting the density of the liquid entering the container in real time and correcting the average density of the liquid to be measured in real time, the liquid level can be accurately measured.

[0030] Please refer to Figure 1 and Figure 2 , a high-precision differential pressure liquid level measurement device for online density measurement provided in this embodiment is used to measure the liquid level of the liquid to be measured in the container 10, and includes a measurement component installed in the container 10 and a PLC system connected to the measurement component. The container 10 is filled with the liquid to be measured. The measurement component can measure the hydraulic pressures at two measurement points in the container 10 and the density of the liquid entering the container 10. The PLC component is used to receive the measurement data of the measurement component, correct the density data in real time, and calculate the liquid level of the liquid to be measured in the container 10 in real time according to the corrected density data.

[0031] Specifically, the measurement assembly includes a first pressure measurement unit, a second pressure measurement unit, and a densitometer 3. The first pressure measurement unit is configured to measure the pressure at the first measurement point in the container 10, and the second pressure measurement unit is configured to measure the pressure at the second measurement point in the container 10, where the first measurement point and the second measurement point are spaced apart in the height direction. Further, the densitometer 3 is installed at the inlet of the container 10 and is configured to measure the density of the liquid entering the container 10 in real time, thereby obtaining the average density of the liquid to be measured in the container 10 in real time through the PLC system, and correcting the density data in real time to improve the accuracy of liquid level measurement.

[0032] Further, the first pressure measurement unit includes a first sensor 11. The first sensor 11 is configured to measure the pressure at the first measurement point. The first sensor 11 is connected to the PLC system, and the PLC is used to receive the pressure data from the first sensor 11.

[0033] Preferably, referring to Figure 1 , the first pressure measurement unit includes a first joint 12 and a first pipe 13. The first joint 12 is provided at the first measurement point and communicates with the container 10. One end of the first joint 12 facing away from the container 10 is circumferentially connected to a first flange plate, and one end of the first pipe 13 is circumferentially connected to a second flange plate. The first flange plate is bolted to the second flange plate. By providing the first joint 12 and the first pipe 13, a measurement port for the first sensor 11 is reserved. By providing the first flange plate and the second flange plate, the connection strength of the structure is improved.

[0034] Specifically, the first pipe 13 includes a connected first straight pipe 131 and a first elbow 132. The first sensor 11 is installed at one end of the first straight pipe 131 facing away from the first elbow 132, and the second flange plate is connected to one end of the first elbow 132 facing away from the first straight pipe 131. Through the above settings, the pressure loss during the pressure measurement process is reduced, the accuracy of pressure detection is improved, and thus the accuracy of liquid level measurement is improved.

[0035] Preferably, one end of the first elbow 132 facing away from the first straight pipe 131 is coaxially arranged with the first joint 12, further reducing the air pressure loss, improving the accuracy of pressure detection, and improving the accuracy of liquid level measurement.

[0036] Further, the first pressure measurement unit further includes a first sealing ring. The first sealing ring is arranged between the first flange plate and the second flange plate to ensure the sealing of the flange connection between the first pipe 13 and the first joint 12, avoid pressure leakage, improve the accuracy of pressure detection, and improve the accuracy of liquid level measurement.

[0037] Exemplarily, in this embodiment, a first ball valve 14 is provided between the measurement end and the installation end of the first sensor 11. By manually controlling the opening of the first ball valve 14, the pressure detection at the first measurement point is realized.

[0038] The second pressure measuring unit includes a second sensor 21 . The second sensor 21 is configured to measure the pressure of a second measuring point. The second sensor 21 is connected to a PLC system. The PLC is used to receive pressure data of the second sensor 21 .

[0039] Preferably, see Figure 2 The second pressure measuring unit includes a second joint, a first connecting pipe 22, a tee 23 and a second pipe 24. The second joint is set at the second measuring point and connected to the container 10. The end of the second joint away from the container 10 is circumferentially connected to the third flange plate. One end of the first connecting pipe 22 is circumferentially connected to the fourth flange plate. The third flange plate is bolted to the fourth flange plate. The other end of the first connecting pipe 22 is sealed and connected to an interface of the tee 23. The second sensor 21 is sealed and installed at another interface of the tee 23. One end of the second pipe 24 is blocked, and the other end is sealed and connected to another interface of the tee 23. The measuring port of the second sensor 21 is reserved by the second joint, the first connecting pipe 22, the tee 23 and the second pipe 24. The connection strength of the structure is improved by setting the third flange plate and the fourth flange plate.

[0040] Preferably, the first connecting pipe 22 is coaxially arranged with the first joint 12 to reduce air pressure loss, improve the accuracy of pressure detection, and improve the accuracy of liquid level measurement.

[0041] Furthermore, the second pressure measuring unit also includes a second sealing ring, which is arranged between the third flange plate and the fourth flange plate to ensure the sealing of the flange connection between the second joint and the first connecting pipe 22, avoid pressure leakage, improve the accuracy of pressure detection, and improve the accuracy of liquid level measurement.

[0042] For example, the first measuring point in this embodiment is set at a certain height of the container 10, and the second measuring point is set at the bottom of the container 10. In other optional embodiments, the first measuring point and the second measuring point can also be set at other positions, which are not specifically limited here.

[0043] For example, in this embodiment, a second ball valve 25 is provided between the measuring end and the mounting end of the second sensor 21 , and the pressure detection of the second measuring point is achieved by manually controlling the opening of the second ball valve 25 .

[0044] Optionally, an inlet pipe is installed on the second pipe 24, and the liquid to be tested enters the container 10 through the inlet pipe, the tee 23, the connecting pipe and the second joint. Further, the densitometer 3 is installed between the tee 23 and the inlet pipe to detect the density of the liquid to be tested.

[0045] An online high-precision differential pressure liquid level measuring device for measuring density provided by this embodiment measures the pressure at the first measurement point through the first sensor 11, measures the pressure at the second measurement point through the second sensor 21, and the density meter 3 measures the density of the flowing liquid in real time. The detected data is connected to the PLC system, and the density data is corrected through real-time detection, so as to achieve the purpose of improving the accuracy and precision of the liquid level data.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A high-precision differential pressure liquid level measuring device for online density measurement, which is used to measure the liquid level of the liquid to be measured in the container (10), and is characterized in that, Comprising: A measurement component, the measurement component includes a first pressure measurement unit, a second pressure measurement unit and a densitometer (3). The first pressure measurement unit is configured to measure the pressure at a first measurement point inside the container (10). The second pressure measurement unit is configured to measure the pressure at a second measurement point inside the container (10). The first measurement point and the second measurement point are spaced apart in the height direction. The densitometer (3) is installed at the inlet of the container (10) and is configured to measure the density of the liquid entering the container (10). A PLC system, the PLC is configured to receive the pressure data of the first pressure measurement unit and the second pressure measurement unit, receive the measurement data of the densitometer (3) and correct the density data in real time, and calculate the liquid level of the liquid to be measured in real time.

2. The high-precision differential pressure liquid level measuring device for online density measurement according to claim 1, characterized in that, The first pressure measurement unit includes a first sensor (11). The first sensor (11) is connected to the PLC system and is configured to measure the pressure at the first measurement point.

3. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 2, characterized in that, A first ball valve (14) is provided between the measurement end and the installation end of the first sensor (11). The first ball valve (14) is opened to measure the pressure at the first measurement point.

4. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 2, characterized in that, The first pressure measurement unit includes a first joint (12) and a first pipe (13). The first joint (12) is provided at the first measurement point and communicates with the container (10). One end of the first joint (12) facing away from the container (10) is circumferentially connected to a first flange plate. One end of the first pipe (13) is circumferentially connected to a second flange plate. The first flange plate is bolted to the second flange plate. The first sensor (11) is installed at the other end of the first pipe (13).

5. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 4, characterized in that The first pressure measurement unit further includes a first sealing ring. The first sealing ring is provided between the first flange plate and the second flange plate.

6. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 4, characterized in that, The first pipe (13) includes a connected first straight pipe (131) and a first elbow (132). The first sensor (11) is installed at one end of the first straight pipe (131) facing away from the first elbow (132). The second flange plate is connected to one end of the first elbow (132) facing away from the first straight pipe (131).

7. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 1, characterized in that, The second pressure measurement unit includes a second sensor (21). The second sensor (21) is connected to the PLC system and is configured to measure the pressure at the second measurement point.

8. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 7, characterized in that, A second ball valve (25) is provided between the measurement end and the installation end of the second sensor (21). The second ball valve (25) is opened to measure the pressure at the second measurement point.

9. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 7, characterized in that, The second pressure measuring unit comprises a second joint, a first connecting pipe (22), a tee (23) and a second pipeline (24); the second joint is arranged at the second measuring point and connected to the container (10); one end of the second joint facing away from the container (10) is circumferentially connected to a third flange plate; one end of the first connecting pipe (22) is circumferentially connected to a fourth flange plate; the third flange plate is bolted to the fourth flange plate; the other end of the first connecting pipe (22) is sealed and connected to an interface of the tee (23); the second sensor (21) is sealed and installed on the other interface of the tee (23); one end of the second pipeline (24) is blocked, and the other end is sealed and connected to another interface of the tee (23).

10. An online density-measuring high-precision differential pressure liquid level measuring device according to claim 9, characterized in that, The second pressure measuring unit further includes a second sealing ring, and the second sealing ring is arranged between the third flange plate and the fourth flange plate.

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