CN201037784Y - Soft pot liquid level measuring instrument - Google Patents

Abstract

The utility model relates to a liquid level gauge for flexible tank, consisting of a telescopic guy rope mechanism, a transmission mechanism, an angle sensor, a heavy hammer and a shell body, wherein, the lower end of a guy rope of the telescopic rope hauling mechanism is connected with the heavy hammer, and the telescopic guy rope mechanism is connected with the angle sensor through the transmission mechanism, and the telescopic guy rope mechanism, the transmission mechanism and the angle sensor are jointly arranged in the shell body. A measuring instrument is arranged on the top of a flexible tank, the guy rope and the heavy hammer are extended into the flexible tank, and the heavy hammer is suspended to the bottom of the tank. When liquid level in the tank changes, a height between the top of the tank and the bottom of the tank changes, and so does the guy rope. The angle sensor collects such displacement change, measures a displacement electric signal of tank height, and then calculates a capacity volume of the medium in the flexible tank. The utility model has the advantages of simple structure, high measurement precision, low cost, convenient installation without changing main body structure of the flexible tank, and can be used for liquid level height measurement of oil, water, chemical raw materials and other liquid medium stored in the flexible tank.

Description

Soft Tank Level Meter

technical field

The utility model relates to a liquid level measurement technology, in particular to an instrument for measuring the liquid level of a soft tank.

Background technique

Soft tank is a kind of flexible and foldable container, which can be used in storage of liquid media such as oil, water, and chemical raw materials. Due to its unique softness, conventional hard tanks cannot be used to measure its liquid level. Currently, indirect measurement methods are mainly used to measure the liquid level of soft tanks. The method of installing a bidirectional flowmeter is to detect the cumulative amount of medium entering and leaving the tank to convert the liquid level value and capacity of the medium in the tank. This method has disadvantages such as complicated installation of the flowmeter, low measurement accuracy, and high cost. There is no direct measurement method and dedicated measuring instrument yet.

Contents of the invention

The purpose of this utility model is to solve the deficiencies of the existing technology, and propose a soft tank liquid level measuring instrument with simple structure, high measurement accuracy, low cost, and easy installation, without changing the main structure of the soft tank, and at the same time meeting the needs of the soft tank. Requirements for explosion-proof places.

The technical scheme of the utility model is as follows:

The soft tank level measuring instrument is mainly based on the characteristics of the soft tank, and reflects the height value of the medium liquid level stored in the soft tank by measuring the height change between the top and the bottom of the soft tank. The measuring instrument is composed of a retractable pull rope mechanism, a transmission mechanism, an angle sensor, a weight and a casing. The lower end of the pull rope of the retractable pull rope mechanism is connected with the weight, and is connected with the angle sensor through the transmission mechanism, and the retractable pull rope mechanism, the transmission mechanism and the angle sensor are jointly installed in the housing.

The angle sensor can choose various existing sensors, such as a rotary potentiometer, a rotary encoder or a rotary photoelectric converter.

The transmission mechanism adopts a magnetic transmission mechanism or other mechanical transmission mechanisms. The magnetic transmission mechanism can be contact type. For soft tanks storing flammable and explosive liquids such as oil, a non-contact magnetic transmission mechanism is used to effectively isolate the angle sensor from the measured liquid.

The housing is divided into two chambers, and the retractable cord mechanism and the angle sensor are installed in the two chambers respectively, so as to achieve the purpose of separating the mechanical transmission mechanism from the electrical signal converter and meet the explosion-proof requirements.

In addition, for soft tanks that store flammable and explosive liquids such as oil, the housing of the measuring instrument adopts an explosion-proof housing.

When in use, the measuring instrument is installed on the top of the soft tank, and the pull rope and the weight of the retractable pull rope mechanism are inserted into the soft tank, and the end of the pull rope is connected with the weight to make it hang down to the bottom of the tank. The position changes, the height between the top of the tank and the bottom of the tank changes, which drives the length of the pull rope to change, and the displacement electrical signal of the height of the tank is measured by the angle sensor. Due to the characteristics of the soft tank, the displacement of the height of the tank The signal can reflect the change of the medium liquid level in the soft tank. The capacity value of the medium in the soft tank can be calculated by collecting the electrical signal output by the angle sensor through a special secondary instrument and a computer processing system.

Compared with the prior art, the utility model has the following advantages: the measuring instrument has a simple structure and is easy to install, and can be directly used for the liquid level measurement of the soft tank; the sensor is completely isolated from the measured medium, and is not affected by the measured medium. Performance limitations, high measurement accuracy; no need to change the main structure of the soft tank; low cost; basically not limited by environmental conditions, while meeting the requirements of soft tanks for explosion-proof places. The utility model can be used for liquid level height measurement of liquid media such as oil storage, water, and chemical raw materials.

Description of drawings

Figure 1 is a schematic diagram of the structure of the measuring instrument;

Figure 2 is a schematic diagram of the installation of the measuring instrument on a soft oil tank.

Detailed ways

The utility model will be described in detail below by taking the liquid level measurement of a soft oil tank as an example.

Referring to FIG. 1 , this is a structural realization of a liquid level measuring instrument for a soft tank, which is composed of a telescopic pull cord mechanism, a transmission mechanism, an angle sensor, a weight 18 and a housing 11 . The casing 11 is an explosion-proof casing, which is divided into two chambers. The retractable cord mechanism and the angle sensor are separated and installed in these two chambers. Connector 19. The telescopic stay rope mechanism is made of reel assembly 16 and stainless steel stay rope 17, and heavy hammer 18 is connected in stainless steel stay rope 17 lower ends, and the weight of heavy hammer 18 will make it hang down to soft oil tank 3 bottoms (see Fig. 2 place) Show). The transmission mechanism adopts a pair of magnetic steels 14 and 15, which are relatively installed on the shaft end of the reel assembly 16 of the telescopic pull rope mechanism and the shaft end of the runner assembly 13 of the angle sensor, and the telescopic pull rope is pulled in a non-contact manner. The rotation of the rope mechanism is transmitted to the angle sensor. The angle sensor adopts a rotary potentiometer, which is composed of a wheel assembly 13 and a potentiometer assembly 12. The magnet steel 14 drives the wheel assembly 13 to rotate, and the wheel assembly 13 drives the potentiometer assembly 12. The potentiometer assembly 12 passes through the pin Send the signal out.

Referring to Fig. 2, without changing the function of the breather valve 2 of the soft oil tank 3, the above-mentioned liquid level measuring instrument 1 is directly installed on the breathable valve at the top of the soft oil tank 3 through the joint 19 of the chamber part where the retractable pull rope mechanism is located. 2, the stainless steel stay rope 17 and the integrated heavy hammer 18 are stretched into the soft oil tank 3 through the hole on the breather valve installation base, and the heavy hammer 18 hangs down to the bottom of the tank body. When filling oil in the oil tank, the weight 18 does not move, and the liquid level measuring instrument 1 rises along with the movement of the soft oil tank 3 top. During the ascent process, the stainless steel stay cord 17 drives the reel assembly 16 of the telescopic stay cord mechanism to rotate. Referring to Fig. The suction force of the magnetic steel 15 and 14 on the wheel assembly 13 transmits the motion of the winding wheel assembly 16 to the runner assembly 13 of the potentiometer, and the runner assembly 13 drives the shaft of the potentiometer assembly 12 to rotate, and the potentiometer assembly 12 Once the shaft rotates, it will change the output resistance of the angle sensor, and the height of the liquid level in the oil tank can be measured through the external dedicated secondary instrument and computer processing system to collect the resistance change value of the angle sensor, and the height of the oil tank can be calculated. The volume of the oil inside.

Claims (8)

1. The software tank liquid level measuring instrument is characterized in that: the measuring instrument is composed of a telescopic pull rope mechanism, a transmission mechanism, an angle sensor, a weight and a shell; the lower end of the pull rope of the retractable rope mechanism is connected to the weight, The retractable rope-drawing mechanism is connected with the angle sensor through the transmission mechanism, and the retractable rope-drawing mechanism, the transmission mechanism and the angle sensor are jointly installed in the housing. 2. The liquid level measuring instrument for a soft tank according to claim 1, wherein the angle sensor is a rotary potentiometer, a rotary encoder or a rotary photoelectric converter. 3. The soft tank liquid level measuring instrument according to claim 2, wherein the rotary potentiometer is composed of a rotary wheel assembly coaxially connected with a potentiometer assembly. 4. The soft tank liquid level measuring instrument according to claim 1, characterized in that: the transmission mechanism adopts a magnetic transmission mechanism. 5. The liquid level measuring instrument for a soft tank according to claim 4, wherein the magnetic transmission mechanism is a contact or non-contact magnetic transmission mechanism. 6. The soft tank liquid level measuring instrument according to claim 5, characterized in that: the non-contact magnetic transmission mechanism is composed of at least one pair of magnetic steels, which are respectively connected to the shafts of the retractable pull rope mechanism and the angle sensor end. 7. The soft tank liquid level measuring instrument according to claim 1, characterized in that: the housing is divided into two chambers, the telescopic pull rope mechanism and the angle sensor are respectively installed in these two chambers, and the telescopic pull rope The part of the chamber where the rope mechanism is located is provided with a joint connected with the soft tank. 8. The soft tank liquid level measuring instrument according to claim 1, characterized in that: the housing is an explosion-proof housing.

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