CN206772386U - A kind of pressure differential method liquid level measuring system - Google Patents

Abstract

The utility model relates to the field of liquid level measuring equipment, and provides a differential pressure liquid level measuring system, comprising: a liquid storage container, a first regulating valve, a balance chamber, a U-shaped pipe differential pressure gauge and a second regulating valve; The top end of the side wall and the bottom end of the side wall of the liquid storage container are respectively provided with an opening; the top opening of the side wall of the liquid storage container communicates with one end of the first regulating valve, and the other end of the first regulating valve communicates with the balance chamber The top is connected; the opening at the bottom end of the side wall of the liquid storage container is connected with one end of the second regulating valve, and the other end of the second regulating valve is connected with one end of the U-shaped tube differential pressure gauge. The other end of the differential gauge communicates with the bottom of the balance chamber. The first regulating valve and the second regulating valve are respectively ball valves. The utility model has the advantages of simple structure, convenient operation, accurate and reliable results, good material stability, and can meet engineering standard requirements.

Description

A liquid level measurement system based on differential pressure method

technical field

The utility model relates to the field of liquid level measuring equipment, in particular to a pressure difference method liquid level measuring system.

Background technique

In chemical production, it is often necessary to know the storage capacity of the liquid in the container, or to control the liquid level in the equipment, it is necessary to measure the liquid level in the container.

At present, there are many devices for measuring liquid level. Generally, liquid level gauges are used for direct measurement or electronic equipment such as liquid level sensors, ultrasonic waves, etc., but for large containers, due to the limitation of the length of the liquid level gauge, multiple liquid level gauges are required to measure the liquid level. It is inconvenient to use in series; while the electronic equipment measurement system has complex structure and high cost.

Utility model content

The utility model mainly solves the technical problems such as complex structure and high cost of the existing liquid level measuring device, and proposes a liquid level measuring system by a differential pressure method. According to the basic principles of hydrostatics, the pressure difference method is used to measure the liquid level. The system has simple structure, convenient operation, accurate and reliable results, and good material stability. After use, it meets the requirements of engineering standards.

The utility model provides a differential pressure liquid level measurement system, comprising: a liquid holding container (1), a first regulating valve (2), a balance chamber (3), a U-shaped tube pressure differential gauge (4) and a second Two regulating valves (5);

The top of the side wall and the bottom of the side wall of the liquid storage container (1) are respectively provided with an opening; the top opening of the side wall of the liquid storage container (1) communicates with one end of the first regulating valve (2), so The other end of the first regulating valve (2) communicates with the top of the balance chamber (3);

The opening at the bottom end of the side wall of the liquid holding container (1) communicates with one end of the second regulating valve (5), and the other end of the second regulating valve (5) communicates with the U-shaped tube differential pressure gauge (4). One end communicates, and the other end of the U-shaped tube differential pressure gauge (4) communicates with the bottom of the balance chamber (3).

Further, the first regulating valve (2) and the second regulating valve (5) are respectively ball valves.

Further, the U-tube differential pressure gauge (4) is a graduated glass tube.

Further, the inner wall of the balance chamber (3) is smooth.

Further, the diameter of the balance chamber (3) is at least 10 times the diameter of the pipeline connecting the balance chamber (3) and the U-shaped differential pressure gauge (4).

The utility model liquid level measurement system, based on the basic principle of fluid statics, provides a pressure difference method to measure the liquid level system of the container. This device is more suitable for liquid level measurement of various large horizontal and vertical containers, especially when the location of the container is close to the operating room.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model liquid level measurement system by differential pressure method.

Reference signs: 1. Liquid storage container; 2. First regulating valve; 3. Balance chamber; 4. U-shaped tube differential pressure gauge; 5. Second regulating valve.

detailed description

In order to make the technical problems solved by the utility model, the adopted technical solutions and the achieved technical effects clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. In addition, it should be noted that, for the convenience of description, only the part related to the present utility model is shown in the drawings but not the whole content.

Fig. 1 is a structural schematic diagram of the utility model liquid level measurement system by differential pressure method. As shown in Figure 1, the differential pressure method liquid level measurement system provided by the embodiment of the utility model includes: a liquid storage container 1, a first regulating valve 2, a balance chamber 3, a U-shaped tube differential pressure gauge 4 and a second regulating valve valve 5.

The top side wall and the bottom end of the side wall of the liquid storage container 1 are respectively provided with an opening; the top opening of the side wall of the liquid storage container 1 communicates with one end of the first regulating valve 2, and the first regulating valve 2 The other end communicates with the top of the balance chamber 3; the bottom opening of the side wall of the liquid storage container 1 communicates with one end of the second regulating valve 5, and the other end of the second regulating valve 5 communicates with the U-shaped pipe differential pressure gauge 4 communicates with one end, and the other end of the U-shaped tube differential pressure gauge 4 communicates with the bottom of the balance chamber 3 .

The utility model liquid level measurement system by differential pressure method sets a balance chamber 3 outside the liquid holding container 1, and the liquid contained in the balance chamber 3 needs to be the same as the material in the liquid holding container 1; The first regulating valve 2 is arranged between the containers 1, and the first regulating valve 2 is used as a switch of the control pipeline and is connected with the top opening (D) of the side wall of the liquid holding container 1, and the liquid level of the balance chamber 3 is maintained at the level of the liquid containing The highest position allowed by the liquid level in the storage container 1; the bottom of the balance chamber 3 is connected to one end of the U-tube differential pressure gauge 4 through a hose, and the other end of the U-tube differential pressure gauge 4 is connected to the liquid container through a hose 1 is connected to the opening (C) at the bottom end of the side wall, and a second regulating valve 5 is set between the U-shaped tube differential pressure gauge 4 and the liquid holding container 1 . The material of the U-tube differential pressure gauge 4 is a glass tube with scale; the first regulating valve 2 and the second regulating valve 5 are respectively ball valves with good sealing performance; the materials used in the balance chamber 3 and the system are smooth inner walls Metal pipe or plastic pipe with small roughness; the diameter of the balance chamber 3 is at least 10 times the diameter of the connecting pipeline between the balance chamber 3 and the U-shaped differential pressure gauge 4. In this embodiment, the cross-sectional area of the balance chamber 3 is far It is much larger than the cross-sectional area of the pipeline to ensure that the influence of the change of the pipeline liquid level on the liquid level change of the balance chamber 3 is basically negligible, so that the liquid level of the balance chamber 3 is basically unchanged; The indicator liquid is required to be immiscible with the liquid material in the liquid storage container 1, and no chemical reaction occurs, and the density is high (so that the reading of the differential pressure gauge is small, and the geometric size of the U-shaped tube does not need to be too large); the U-shaped tube differential pressure gauge 4 The two ends are connected to the pipeline with rubber tubes or hoses; the opening (C) at the bottom end of the side wall of the liquid storage container 1 is set below the liquid level, and the top opening (D) of the side wall of the liquid storage container 1 is set as far as the liquid level allows. top position. Open the first regulating valve 2 and the second regulating valve 5 during work, the indicating liquid level of the original two ends of the U-shaped pipe differential pressure gauge 4 with the same height begins to change, the height of the left end increases, and the height of the right end decreases, and the liquid level difference is R( The reading of the U-tube differential pressure gauge 4). Since the entire pipeline is in communication with the liquid holding container 1, according to the basic principles of hydrostatics, the pressure at the lower end of the liquid level of the U-shaped differential pressure gauge 4 (at the right end A) is equal to the same height at the other end (at the left end B) The pressure, that is, PA = _{P B .} It can be calculated and deduced that h=(ρ _{indicator liquid} -ρ _material ) R/ρ _material , that is, the height of h can be obtained by measuring the reading R (height difference between the two ends of the U-shaped tube) of the U-shaped tube differential pressure gauge 4, wherein, h is the difference between the liquid level height of the balance chamber 3 and the actual liquid level height of the liquid holding container 1, because in engineering, the liquid level height of the balance chamber 3 is basically equal to the maximum liquid level height allowed by the liquid level of the liquid holding container 1 ( The difference is very small and negligible), so the actual liquid level height of the liquid storage container 1 can be indirectly obtained (that is, the difference between the maximum liquid level height allowed by the liquid level of the liquid storage container 1 and h, and the liquid level of the liquid storage container 1 is allowed The height of the highest liquid level is known before the measurement). It can be seen that the smaller the reading R of the differential pressure gauge is, the smaller h is, and the higher the actual liquid level of the liquid container 1 is; when R is zero, h is also zero, and the liquid level reaches the highest.

The utility model liquid level measurement system, based on the basic principle of fluid statics, provides a pressure difference method to measure the liquid level system of the container. This device is more suitable for liquid level measurement of various large horizontal and vertical containers, especially when the location of the container is close to the operating room.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It modifies the technical solutions described in the foregoing embodiments, or replaces some or all of the technical features in an equivalent manner, and does not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the various embodiments of the present utility model.

Claims (5)

1. A kind of 1. pressure differential method liquid level measuring system, it is characterised in that including：Liquid containing container (1), the first regulating valve (2), put down Weighing apparatus room (3), U-tube differential manometer (4) and the second regulating valve (5)；

   The side wall top and side wall bottom of the liquid containing container (1) set an opening respectively；The liquid containing container (1) side wall top end opening connects with one end of the first regulating valve (2), the other end of first regulating valve (2) and balance cylinder (3) top connects；

   The side wall bottom end opening of the liquid containing container (1) connects with one end of the second regulating valve (5), second regulating valve (5) the other end connects with the one end of U-tube differential manometer (4), the other end and balance cylinder (3) bottom of the U-tube differential manometer (4) Portion connects.
2. 2. pressure differential method liquid level measuring system according to claim 1, it is characterised in that first regulating valve (2) and Two regulating valves (5) are respectively ball valve.
3. 3. pressure differential method liquid level measuring system according to claim 1, it is characterised in that the U-tube differential manometer (4) is band The glass tube of scale.
4. 4. pressure differential method liquid level measuring system according to claim 1, it is characterised in that the inwall light of the balance cylinder (3) It is sliding.
5. 5. the pressure differential method liquid level measuring system according to claim 1 or 4, it is characterised in that the diameter of the balance cylinder (3) At least 10 times of balance cylinder (3) and U-tube differential manometer (4) connecting line diameter.