CN206387470U - Liquid level emasuring device - Google Patents

Abstract

The utility model discloses a liquid level measuring device. The device is vertically put into the container of the liquid to be measured. When the sleeve below the device touches the bottom of the container, the solid rod in the sleeve acts on the pressure sensor simultaneously. Change, according to the Archimedes principle, it can be converted that there is a fixed formula relationship between the change signal obtained by the pressure sensor and the liquid level. The data processing and display module converts and calculates this signal and outputs it to the display screen to obtain the liquid level value intuitively. A detachable connection buckle is designed in the device to protect the pressure sensor, and a detachable sleeve with a slightly larger radius is installed coaxially on the outside to reduce the impact of injected liquid or liquid sloshing on the buoyancy of the solid rod. The material and size of the solid rod and the sleeve used in the device described in the utility model can be selected and changed according to the type of liquid to be measured and the size of the container. High precision.

Description

Liquid level measuring device

technical field

The utility model relates to the technical field of measurement, in particular to a liquid level measuring device.

Background technique

The liquid level refers to the height of the liquid level of the liquid medium in the container. In industrial production, liquid level is a very important parameter. Liquid measurement plays an important role in industrial production, and some even directly affect the safety of production. The liquid level gauge is an instrument for measuring the liquid level. In the actual operation process, there are more and more requirements for liquid level measurement. Different types of liquid level gauges should be selected according to the requirements of different aspects.

In the industrial field, to measure the liquid level, in addition to the static pressure liquid level measurement of the submersible liquid level gauge, there are float liquid level measuring devices, magnetic flap liquid level method, radar method, ultrasonic method, bubble method, etc. Some of these devices have low measurement accuracy, and many of them have high requirements on the shape, structure and material of the container. The installation of radar and ultrasonic devices is relatively complicated and the installation volume is relatively large; In terms of operation and maintenance, it is necessary to ensure the watertightness of the sensor and prevent the electrode insulation layer from colliding. Some measured liquids whose dielectric constant changes frequently cannot be measured. Most measuring devices are limited by the performance of the measured liquid and the shape of the container. In order to overcome the above technical limitations Insufficient, a liquid level measuring device with wide adaptability and easy to use is proposed.

Contents of the invention

The purpose of the utility model is to provide a liquid level measuring device, which solves the disadvantages of the existing measuring technology, has strong compatibility and high accuracy, and can be widely used.

The technical scheme of the utility model is:

The liquid level measurement device includes a pressure sensor, a data processing and display module, a casing, a connecting buckle, a solid rod, and a sleeve. The casing is provided with a pressure sensor and a data processing and display module connected by a data line. The lower end of the pressure sensor Connect the connecting buckle, the sleeve is set outside the solid rod, the bottom end of the sleeve is provided with a hole for the liquid to be measured to enter and exit, the sleeve and the shell are detachably connected, and the connecting buckle is connected to the upper end of the solid rod through threads.

The beneficial effects of the utility model are:

The device is suitable for measuring various types of liquids, and does not limit the shape of the container. The material and size of the solid rod and sleeve that penetrate into the liquid to be measured can be adjusted according to actual requirements. Strong compatibility, wide application range, low equipment cost and high measurement accuracy.

Description of drawings

Fig. 1 is the structural representation of the utility model device.

Fig. 2 is a schematic diagram of an example of a connection buckle between a pressure sensor and a solid rod.

Figure 3 is a schematic diagram of the shape of an example of a solid rod.

1—pressure sensor, 2—connecting buckle, 3—solid rod, 4—sleeve, 5—data processing and display module, 6—shell.

detailed description

Embodiments of the utility model will be further described below in conjunction with the accompanying drawings. Fig. 1 is a schematic structural diagram of the liquid level measuring device of the present invention. As shown in Figure 1, the liquid level measuring device of the present invention includes a pressure sensor, a connecting buckle, a solid rod, a sleeve, a data processing and display module, and a casing, and a pressure sensor and a data processing and display module connected to each other are arranged in the casing.

As shown in the figure: Select the appropriate solid rod and sleeve according to the nature of the liquid to be tested and the size of the container. The density of the solid rod is required to be greater than the liquid to be tested to ensure that the resultant force on the solid rod in the liquid to be tested is downward. It is cylindrical, with a diameter of about 8-12mm. The sleeve is set outside the solid rod, and the inner hollow is cylindrical, 5-10mm larger than the diameter of the solid rod. There is a hole (diameter 2mm) at the bottom of the sleeve for the liquid to enter and exit. ~5mm), the solid rod and the sleeve are both higher than the container of the liquid to be measured, and the bottom of the solid rod is 2~5mm higher than the bottom of the sleeve; in order to protect the pressure sensor at the upper end, a detachable solid rod and sleeve are designed in the device The connection between the sleeve, the solid rod and the pressure sensor is through a connecting buckle, as shown in Figure 2 and Figure 3, the connecting buckle can be in the form of an iron internal thread, and the upper end of the solid rod is in the form of an external thread, which is easy to disassemble with the connecting buckle of the internal thread and connection; the connection between the sleeve and the shell can be threaded or buckled; the pressure sensor is a strip-shaped device with mounting holes on both sides. When installing, one side is fixed with the shell, and the other side is fixed with the connecting buckle, as shown in the figure As shown in 1; the data processing and display module includes three parts: AD converter, single-chip microcomputer chip, and digital display screen. The three parts are connected by data lines as shown in Figure 1. The chip converts the processed digital signal, and a fixed calculation formula is designed inside, and finally outputs the result to the display screen. The three parts in the data processing and display module are all fixed in the casing.

Install the solid rod and the sleeve of the device of the utility model respectively (in order to protect the pressure sensor, the sleeve and the solid rod should be removed after the device is used), put the device vertically into the container, and the bottom of the sleeve touches the container bottom to read the value from the display. When the liquid to be measured is injected into the container or the height of the existing liquid is greater than 5mm, the liquid enters the sleeve through the hole in the sleeve at the bottom of the container, and the height (liquid level) of the liquid injected into the container is consistent with the height of the liquid entering the sleeve. According to the principle of Kimedes, the buoyancy of the object immersed in the liquid is equal to the gravity of the liquid displaced by the object. After the material and size of the solid rod are fixed, the buoyancy of the solid rod under the measured liquid is proportional to the height of the measured liquid. The changing force of the solid rod on the pressure sensor is the only variable to obtain the liquid level value of the measured liquid. The pressure sensor transmits this change signal to the data processing and display module. After conversion and calculation, the liquid level of the measured liquid can be accurately obtained. bit.

When measuring ordinary liquids such as water, the solid rod can be a low-cost steel rod, and the sleeve can be made of plastic or glass. When measuring acidic liquids or high-temperature liquids, acid-resistant and high-temperature-resistant materials can be used.

Although the liquid level measuring device of the present invention has been described above in conjunction with exemplary embodiments, those of ordinary skill in the art should understand that the above-mentioned related embodiments are for explaining the relevant principles of the present invention, and the scope of protection and application is not limited to the above-mentioned The description of the embodiment, the connection buckle designed in the device and the connection between the sleeve and the shell can also be changed according to actual needs, and various changes can be made to the above exemplary embodiment without departing from the scope of protection of the claims.

Claims (5)

1. A liquid level measuring device, characterized in that: it comprises a pressure sensor, a data processing and display module, a casing, a connecting buckle, a solid rod, and a sleeve, and the casing is provided with a pressure sensor and a data connection connected by a data line. Processing and display module, the lower end of the pressure sensor is connected to the connecting buckle, the sleeve is set outside the solid rod, and the bottom of the sleeve is provided with a hole for the liquid to be measured to enter and exit, the sleeve and the shell are detachably connected, and the connecting buckle It is connected with the upper end of the solid rod through threads. 2. A liquid level measuring device according to claim 1, characterized in that: the material of the solid rod is denser than the liquid to be measured, and is cylindrical with a diameter of 8-12 mm. 3. A liquid level measuring device according to claim 1, characterized in that: the sleeve is hollow cylindrical, 5-10mm larger in diameter than the solid rod, and the bottom end of the solid rod is higher than the bottom end of the sleeve 2~5mm. 4. A liquid level measuring device according to claim 1, characterized in that the pressure sensor adopts a Wheatstone bridge design, and the sensitivity is within ±1mm. 5. A liquid level measuring device according to claim 1, characterized in that: said data processing and display module includes three parts: AD converter, single-chip microcomputer chip, and digital display screen, and the three are connected with data lines for Receive and process the changing signal generated by the pressure sensor.