Float-type liquidometer with buoy for high-temperature high-pressure medium or high-pressure low-density medium

Abstract

The invention relates to a float-type liquidometer with buoy for high-temperature high-pressure medium or high-pressure low-density medium, comprising a float chamber, a float, a buoy chamber and a buoy. Upward lifting power is provided for the float by buoyancy to the buoy via magnetic force attraction between the float and the buoy. A force balance mechanism for lifting the float has simple structure, saves complex mechanical transmission mechanisms and has convenient transportation and installation; friction among other designed magnetic coupling components is in rolling friction structure, thus reducing lag and improving precision. The invention solves the problem of liquid level measurement in high-temperature high-pressure medium or high-pressure low-density medium and has high measurement precision, simple structure, convenient use, low maintenance and production cost and wide applicable range.

Description

technical field [0001] The invention relates to the field of liquid level measurement, in particular to a float type or magnetic float type liquid level gauge for high-temperature, high-pressure or high-pressure, low-density media. Background technique [0002] The liquid level gauge is an instrument with a wide range of applications. The existing liquid level measuring instruments are of various types. Now for high temperature and high pressure vessels, where the medium is highly corrosive or the pressure is high and the medium density is low, the following analysis is made: [0003] In the case of high pressure or high pressure and low density, it is very difficult to manufacture the float due to high pressure or high pressure and low medium density. For high temperature and high pressure, the manufacture of the float is even more difficult: because the metal material is in When the strength decreases at high temperature, the wall thickness of the float needs to be increa...

AI Technical Summary

Problems solved by technology

But it has the following disadvantages: 1. The float lacks upward external lifting force, and the vernier does not provide this force, so it is still difficult to make a float that can withstand higher pressure or low specific gravity and high sensitivity

2. Both the float and the vernier are sliding friction, resulting in a large friction coefficient, which makes the friction force large and affects the accuracy and sensitivity

Its shortcomings are: 1. The buoy is one of the loads of the float, which is not conducive to making a high-pressure low-specific gravity float

2. The float lacks the upward lifting force from the outside world, so it is still difficult to make a float that can withstand higher pressure or low specific gravity and high sensitivity

[0009] As described in ZL97213710.6, it adopts a magnetic coupling structure, and adds a counterweight to the ribbon outside the float to balance the weight of the float, which is conducive to improving its operating temperature and pressure range, and making it suitable for use in low-density applications , but its shortcomings are: 1. When the working pressure is high, the partition between the magnetic coupling parts will be very thick, and the axial end face of the partition is flat, which is equivalent to the flange or blind plate on the pipeline , its thickness is determined by the working pressure, temperature, diameter, and the selected material, and the standard design will be very thick. If the thickness of the partition is too large, the magnetic coupling force will be too small until it does not work. The attenuation of the magnetic attraction force and the distance It is at the geometric level. If it is coupled radially outside the circular pipe, its wall thickness will be much smaller. The wall thickness will be calculated by the design of pressure vessels or pipes. It can also be calculated by checking the pressure vessel or pipe design manual.

2. There are many parts in the floater, and corrosion-resistant materials must be used for corrosive media, which increases the manufacturing cost

3. Steel wire and steel belt are used inside, medium fluctuations can easily cause breakage and affect service life

4. The upper and lower pulleys tighten the ribbon, which increases the friction and affects the sensitivity and measurement accuracy

5. The magnetic coupling is a sliding friction, the friction is large, and it also affects the accuracy

But their shortcomings are: 1. At high temperature and high pressure, the float chamber and the counterweight chamber must be made of expensive high alloy steel, which are two chambers, thus greatly increasing the production cost

2. The counterweight chamber will accumulate condensate, and when the counterweight is immersed in the condensate, the measurement accuracy will be affected by the upward buoyancy

4. In high temperature occasions, high temperature bearings must be used

5. There are many internal parts, which affect the reliability of use, especially in high temperature occasions

6. There are many internal parts and they are in the pressurized float chamber, so the maintenance is troublesome and the maintenance cost is high

7. The magnetic steel is in the float chamber, and the demagnetization temperature of the magnetic steel limits the service temperature of the liquid level gauge

But its disadvantages are: 1. The float and the counterweight are in the same float chamber. Under the same sensitivity or precision, the diameter of the float chamber mus...

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