CN207317897U - A kind of open space Weighing type liquid level meter - Google Patents

Abstract

A kind of open space Weighing type liquid level meter, it is more than solution sealing in area to be measured including density, the measuring stick made by resistant material, the length of the measuring stick and the maximum luffing of area's liquid level to be measured match, the upper end of the measuring stick is fixed on the measurement end of digital weighing sensor, the other end of the digital weighing sensor is fixed on the surface in area to be measured, the data terminal of the digital weighing sensor is connected with weighing displaying controller, the present apparatus is simple in structure, there is no machine driving link, it is applicable in the well of various open spaces, hole, the level gauging in pond, reliability is high, precision is high, particularly water quality inferiority, environment more than debris.

Description

An Open Space Weighing Type Liquid Level Gauge

technical field

The utility model relates to an open space weighing type liquid level gauge.

Background technique

At present, there are roughly more than 20 methods for continuous liquid level measurement: glass tube method, glass plate method, two-color water level method, manual measuring method, air blowing method, differential pressure method, HTG method, float method, buoy method, floating ball method , servo method, sinking tube method, capacitance method, resistance method, inductance method, magnetostrictive method, ultrasonic method, modulated optical method, microwave method, magnetic flap method, vibration method, nuclear radiation method, optical fiber sensor method; and There are mainly differential pressure method, float method, buoy method, floating ball method and sinking method to measure the liquid level in open space. For the occasions where the water level is deep and remote transmission and control are required, it is mainly a variant of the differential pressure method - an immersion pressure transmitter, but there are some special occasions, such as the water level measurement of the trash rack in the circulating water pump room of the power plant, so far there is no A good solution, even if the immersion pressure transmitter with high cost is working in the river water containing a lot of impurities for a long time, the measuring probe is easy to be blocked, so the water level cannot be measured correctly.

Utility model content

The utility model overcomes the deficiencies of the above-mentioned technologies and provides an open space weighing liquid level gauge with simple structure, low cost, reliable corrosion resistance and high measurement accuracy.

An open space weighing liquid level gauge, comprising a measuring rod sealed with a density greater than that of the solution in the area to be measured and made of corrosion-resistant materials, the length of the measuring rod matches the maximum variation of the liquid level in the area to be measured, The upper end of the measuring rod is fixed on the measuring end of the digital load cell, the other end of the digital load cell is fixed directly above the area to be measured, and the data end of the digital load cell is connected to the weighing display controller . Due to the above structure, the digital weighing sensor is set directly above the area to be measured, and is not in contact with the solution in the area to be measured during the entire measurement process, but is in contact with the solution through a corrosion-resistant measuring rod, using Archimedes The principle is to monitor the change of the weight of the measuring rod through the digital weighing sensor, so as to indirectly obtain the height of the liquid level rise and fall in the area to be measured. Position measurement, high reliability and high precision, especially in the environment with poor water quality and many sundries.

A fence that prevents the measuring rod from swinging is installed around the measuring rod, thereby helping the measuring rod to be fixed and preventing the measuring rod from swinging sharply in the rapids.

The measuring rod is a PVC plastic rod.

Choose a material with a suitable specific gravity as the measuring rod immersed in the liquid. Assume that the maximum change range of the liquid level is L ₀ , the density is ρ ₀ , and the length of the measuring rod is L, then L ₀ ≤ L ≤ 1.1L ₀ . If the density is ρ, then 1.2ρ ₀ ≤ρ≤2ρ ₀ , it is better for the measuring rod to be a corrosion-resistant solid rod. precision;

Assuming that the range of the digital weighing sensor is M (expressed in kilograms), the diameter φ of the measuring rod shall be the closest The specifications, generally 25mm≤φ≤100mm, so that its weight is close to the range of the load cell, and its purpose is to improve the measurement accuracy;

To sum up, this device has a simple structure and no mechanical transmission links. It is suitable for liquid level measurement of wells, pits and pools in various open spaces. It has high reliability and high precision, especially in environments with poor water quality and many sundries. Even if the device measures a wide range of water level changes under poor water quality, there is no problem, and the measurement accuracy is as high as 1‰FS.

Description of drawings

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

Detailed ways

Now in conjunction with the accompanying drawings, the technical content of the utility model is further described.

As shown in Figure 1, a kind of open space weighing type liquid level gauge, comprises the measuring rod 1 that density is greater than the liquid seal in the area to be measured, made of PVC plastic rod, the length of the measuring rod 1 is the same as that of the liquid in the area to be measured. The maximum amplitude of the position is matched, the upper end of the measuring rod 1 is fixed on the measuring end of the digital load cell 2, and the other end of the digital load cell 2 is fixed directly above the area to be measured, and the digital load cell The data terminal of the sensor 2 is connected with the weighing display controller 3 , and the digital weighing sensor 2 is connected with the monitoring system 4 . A fence that prevents the measuring rod from swinging is installed around the measuring rod 1 . Due to the adoption of the above structure, the digital weighing sensor 2 is set directly above the area to be measured, and is not in contact with the solution in the area to be measured during the entire measurement process, but is in contact with the solution through a corrosion-resistant measuring rod. Based on the German principle, the weight change of the measuring rod 1 is monitored by the digital weighing sensor 2, so as to indirectly obtain the height of the liquid level rise and fall in the area to be measured. This device has a simple structure and no mechanical transmission link, and is suitable for wells, pits, The liquid level measurement of the pool has high reliability and high precision, especially in the environment with poor water quality and many sundries.

Assuming that the maximum variation range of the liquid level in the area to be measured is L ₀ and the density is ρ ₀ , a material with length L (L _{0 ≤} L ≤ 1.1L ₀ ) and density ρ (1.2ρ ₀ ≤ ρ ≤ 2ρ ₀ ) can be selected as The measuring rod 1 and the measuring range of the digital weighing sensor 2 generally do not exceed 100Kg. Assuming that the measuring range of the digital weighing sensor 2 is M (expressed in kilograms), the diameter φ of the measuring rod 1 is taken as the closest The specifications, generally 25mm≤φ≤100mm.

When in use, hang the measuring rod 1 freely under the digital load cell 2, connect the weighing display controller 3 (such as the 220 force value display controller), and power on the weighing display controller 3 (after the power has been turned on In the case of zero, you can press the reset button), at this time the weighing display controller 3 will use the current weight as the zero point.

As shown in Figure 1, assume that the length of the measuring stick 1 immersed in the liquid is H, and the mass change measured by the weighing display controller is M _H = ρ ₀ π(φ/2) ² H, and H = M _H / ρ ₀ π(φ/2) ² , the liquid level H can be displayed directly by changing the display coefficient of the weighing display controller, and M _H is the weight of the measuring rod measured by the weighing display controller.

Example:

In this example, if the maximum change in water level is 4m, use a φ35mm, 4m long PVC plastic rod (density 1300kg/m ³ ), and its weight (expressed in kilograms) W ₀ =π×0.0175 ² ×4×1300= 5㎏, if the depth of immersion in water is H, the weight measured by the sensor (expressed in kilograms) W=W ₀ -1000×(π×0.0175 ² ×H) is: H=(5-W)×1.04 meters, choose A load cell with a measuring range of 5 kg, and calibrate 5 kg to zero, and use tension measurement, then H=W×1.04 meters. At present, the accuracy of the load cell is generally about 0.5‰FS, and the accuracy of water level measurement can reach ±2.6mm. Within 1‰FS, equipped with 220-type force value display controller, it can realize 4-20mA remote transmission and multiple sets of relay output to realize remote monitoring of water level.

Claims (4)

1. A kind of 1. open space Weighing type liquid level meter, it is characterised in that：Including density be more than area to be measured in solution sealing, by resistance to The measuring stick that corrosion material makes, the length of the measuring stick and the maximum luffing of area's liquid level to be measured match, the measuring stick Upper end be fixed on the measurement end of digital weighing sensor, the other end of the digital weighing sensor is being fixed on area to be measured just Top, the data terminal of the digital weighing sensor are connected with weighing displaying controller.
2. 2. open space Weighing type liquid level meter according to claim 1, it is characterised in that：The surrounding installation of the measuring stick There is the fence for preventing that measuring stick from swinging.
3. 3. open space Weighing type liquid level meter according to claim 1 or 2, it is characterised in that：If area's liquid level to be measured is most Big amplitude of variation is L₀, area's solution density to be measured is ρ₀, the length of measuring stick is L, and the density of measuring stick is ρ, then L₀≤L≤ 1.1L₀And 1.2 ρ₀≤ρ≤2ρ₀ 。
4. 4. open space Weighing type liquid level meter according to claim 3, it is characterised in that：The measuring stick is PVC plastic Rod.