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A Float Type Liquid Level Gauge for Local Indication

A liquid level gauge and float type technology, which is applied in the field of liquid level measurement, can solve the problems of discontinuous remote transmission signals, increased manufacturing costs, and many internal parts of the float, so as to overcome signal discontinuity and poor reliability, reduce procurement costs, The effect of reducing manufacturing costs

Inactive Publication Date: 2011-11-30
DALIAN CONSERVATION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that there is no friction force caused by magnetic coupling force, but its disadvantages are: 1. The structure of the loop supplying power to the spotlight is complicated
2. The electric guide rail is immersed in the liquid. It must be made of corrosion-resistant materials, and it cannot be used in explosion-proof occasions. When running up and down, the brush will carry the medium from the guide rail to the float.
3. There is an aging problem in the elastic insulating ring, which affects reliable use
5. The power supply to the spotlight and the power supply to the photosensitive element belong to two circuits, and the float measurement and photosensitive element parts are independent, that is, the magnetic float uses pulleys and tracks, and the remote sensor uses a set of fixed brackets, resulting in a complex structure
6. Roller pulleys and spotlights are placed on the float, which further increases the quality of the float, and then needs to increase the volume and thickness of the float and the float chamber shell. In this case, it is not suitable for low-density and high-pressure applications.
7. It is easy to form water film on the surface of the spotlight or gather dust on the photosensitive element, which will affect the use
10. There are many internal parts in the float chamber shell. When it is used in strong corrosive media, all the internal parts must be made of expensive corrosion-resistant materials, resulting in increased costs.
[0008] As described in ZL99220056.3, ZL94235895.3, ZL200820107045.9, ZL94206404.6, and ZL89210466.X, they have the following problems respectively: 1. The structure is complex and huge, the transmission mechanism has many wire wheels, and the friction is large, which affects the accuracy and sensitivity
2. The on-site instructions are not clear and visual inspection is difficult, especially at night or in darkness
3. Some have no remote transmission or the remote transmission signal is not continuous
4. Cumulative errors caused by slipping
5. On-site instruction and remote transmission use two independent mechanisms, resulting in complex structure and high cost
[0009] As described in ZL200410015416.7, this liquid level gauge can solve the application of high-pressure boilers well, but it has the following disadvantages: 1. Two structural parts or fixed frames are used for on-site indication and remote transmission, making the structure complicated
2. The remote transmission signal is not continuous
3. The magnetic car needs 4 wheels, otherwise the cursor will deflect or shake up and down and cannot be used. This will make the structure complicated, and the second will increase the weight of the magnetic car, thereby increasing the load of the float, which is equivalent to the increase in the weight of the float. , it is difficult to meet the use in high temperature and high pressure or high pressure and low density medium occasions
4. On-site visual inspection is inconvenient
5. The float and the float chamber are sliding friction, the friction force is large, and the display lags behind
[0010] As mentioned in ZL89210640.9, the liquid level gauge uses rolling friction to reduce the frictional force. Its disadvantages are: 1. The signal remote transmission part needs to add a sliding wire resistor with a skeleton and the sliding wire resistor. The movable arm makes the structure complex and additionally increases the friction
2. The local instructions are not clear
3. Although it is mentioned that the float is simple in spherical shape, when the float is made of non-ferromagnetic material, ferromagnetic material is inlaid on the waterline or equatorial zone, which will form sliding friction and cause large friction force. It can be seen that the inventor only considered The spherical float is simple to manufacture, and the ferromagnetic material is embedded in the horizontal line or equatorial zone, it can be seen that the inventor did not consider the influence of the shape of the float on the friction force
But there are the following shortcomings: 1. The float is open, and the condensate is easy to deposit inside the float, which affects normal use
2. The structure is complicated, and a lot of parts are used only for the clear display on site
3. At the same time, there are some problems listed in the aforementioned ZL200410015416.7
In addition, the reed switch signal is discontinuous, unreliable, and the circuit is complicated
[0013] As described in ZL97243163.2, its advantage is that the on-site instructions are clear, but there are still the following shortcomings: 1. Two pairs of static contacts are used to connect different light-emitting diodes, so that there are many switches and light-emitting elements, which affects reliability.
2. More components and more complex structure
3. The signal is not continuous
[0016] As described in ZL98239064.5, ZL01250601.X and ZL94239095.4, their advantages are that the load on the float is reduced and the sensitivity of the float is improved, but there are the following disadvantages: 1. The upper and lower pulleys are tensioned and displayed Belt, increased friction, causing display lag and affecting accuracy
2. As a live display, the structure appears complex
3. If remote transmission is added, an additional mechanism consisting of a magnetic car is required, which makes the structure more complicated and brings great inconvenience to manufacturing and debugging.
4. Difficulty in visual inspection at night or in dark places
5. The structure of the remote sensor is complex and the circuit is complicated
6. The remote transmission signal is discontinuous
7. There is sliding friction between the float and the float chamber, the friction force is large, and the display lags behind
[0017] As described in ZL97213710.6, it adopts a magnetic coupling structure, and adds a counterweight to the color band outside the float to balance the quality of the float, which is conducive to improving its operating temperature and pressure range, and making it suitable for use in low-density occasions , 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. Difficulty in visual inspection at night or in dark places
5. Two sets of structures are used for on-site indication and remote transmission, and the structure is complex, affecting reliability and high manufacturing cost
6. The upper and lower pulleys tighten the ribbon, which increases the friction and affects the sensitivity and measurement accuracy
7. The magnetic coupling is a sliding friction, the friction is large, and it also affects the accuracy
[0018] 3. Existing float type liquid level gauge without local indication but with remote transmission
[0019] As described in ZL99203851.0 and ZL02215560.0, their advantages are simple in structure, and their disadvantages are: 1. The sensing element is inserted into the tube extending in the container liquid, which is not resistant to high temperature
2. The float with a guide hole in the middle is not resistant to high pressure
3. Another set of connecting pipes is required if the local indication is realized
4. The float is easy to get stuck
5. Use reed switch to make more components, unreliable and discontinuous signal
6. Two spiral tube type resistance wires are adjacently wound on the insulator, too dense is easy to short circuit, too sparse will affect the accuracy
When the winding is too loose, it may not work properly due to the point contact of the ball and the disconnection
7. It is possible to stop work during maintenance
[0020] As mentioned in ZL98229246.5: Its advantage is that it does not require magnetic sensitive components, which greatly improves reliability, but it also has the following disadvantages: 1. The resistor is placed in the sensor tube, which cannot be used in high temperature applications
2. The float and shell of this structure are not resistant to high pressure (the internal pressure of the tube is greater than the external pressure)
3. The weight of the float increased by the magnetic trolley is not conducive to the use in high temperature and high pressure or high pressure and low density occasions
4. The signal is not continuous
5. There is no on-site instruction, if additional on-site instructions are added, an additional set of institutions is required
6. The structure of the magnetic trolley is complex
[0024] 1. The remote transmission signal is not continuous;
[0025] 2. There are many precious metals or corrosion-resistant materials (pulleys, bearings, float chambers, etc. need to be selected according to process conditions, such as high temperature and corrosion), which further increases the manufacturing cost;
[0026] 3. Higher working pressure or high pressure and low density occasions are difficult to apply;
[0027] 4. The counterweight (or counterweight) is immersed in the liquid to affect the accuracy;
[0028] 5. The local instructions are not clear; it is difficult to observe in dark places;
[0029] 6. Difficulty in assembly and calibration;
[0035] 10. The structure is complex, such as on-site indication and remote transmission need two sets of mechanisms, other complex mechanical mechanisms, etc., with large size, poor reliability and high cost
[0036] 11. The float or float chamber needs to be made very long, which wastes materials, is huge in size, and has a heavy burden on packaging and transportation
[0037] 12. The float is easy to get stuck
[0038] In addition, it is impossible to set up a large lighting lamp for a liquid level gauge in many factories and construction sites or in many outdoor places, and it is even more impossible to install lighting lamps for each liquid level gauge separately, which is not conducive to energy saving.
This leads to the inconvenience of observation

Method used

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  • A Float Type Liquid Level Gauge for Local Indication
  • A Float Type Liquid Level Gauge for Local Indication
  • A Float Type Liquid Level Gauge for Local Indication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Embodiment 1 Atmospheric pressure vessel float type liquid level gauge

[0112] Such as figure 1 , the float type liquid level gauge shown in 2 includes a float 1, a connecting rope or a connecting belt 2 placed on the pulley 3, and its two ends are respectively connected with the float 1 and the luminous wheel 5, and are fixed on the insulating block 6 perpendicular to the ground Two magnetic and conductive guide rails 4 and a scale 7 on the top; the pulley 3 is fixed above the container 9, and the scale 7 is fixed on the container 9 or the liquid level gauge perpendicular to the ground, and is located on one side of the luminous wheel 5 .

[0113] The luminous wheel 5 is composed of two magnetic shafts 5-3 arranged horizontally and coaxially, a light source 5-1 between the two magnetic shafts 5-3, and two wires connecting the two magnetic shafts 5-3 and the light source 5-1 respectively 5-5 and insulating box 5-4 constitute. Bearings 5-2 are respectively installed ...

Embodiment 2

[0122] Embodiment 2 has a float type liquid level gauge for the container with pressure

[0123] Such as image 3 , the float type liquid level gauge shown in 4 comprises a float chamber 10 made of a non-ferromagnetic material that communicates with the measured container 9 and is fixed on the measured container 9, and a float 1 made of a ferromagnetic material in the float chamber 10, It is characterized in that it also includes guide rails 4 made of two conductive materials outside the float chamber 10, an insulating block 6 under the guide rails 4, a scale 7, and a luminous wheel 5. The luminous wheel 5 is composed of a light source 5-1, a magnetic steel 5-7, an insulating box 5-4, a metal shaft 5-9 and two wires 5-5 that supply power to the light source 5-1, and the two wires 5-5 are respectively connected to the two electrodes of the light source 5-1 and the two Metal shafts 5-9. Two guide rails 4 are equidistant from the float chamber and are located between the float ...

Embodiment 3

[0131] Embodiment 3 Magnetic float type liquid level gauge suitable for pressure vessels with medium temperature not too high

[0132] Such as Figure 5 , a magnetic float type liquid level gauge shown in 6 is suitable for occasions where the temperature of the medium is not too high, that is, when the magnetic steel will not be demagnetized, in order to improve the magnetic attraction force, it is characterized in that the float 1 is made of non-ferrous Made of magnetic materials, the float is equipped with more than one piece of circular magnetic steel A11 with the same inner diameter as the float, and a magnetic steel B5-8 is installed between the two guide rails 4 on the luminous wheel 5, and the magnetic steel B5-8 is a circular magnetic steel The central part of the magnetic steel B5-8 fixed in the insulating box 5-4 is coaxial with the metal shaft 5-9 in the luminous wheel, and the magnetic poles of the magnetic steel A11 and the magnetic steel B5-8 are respectively loc...

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Abstract

The invention relates to a float type liquid level gauge, which includes a float, a scale and a luminous wheel, and is characterized in that it also includes a conductive or magnetically conductive guide rail, and the luminous wheel includes an insulating box, a light source, and two horizontally arranged magnetic shafts Or a metal shaft and two wires that supply power to the light source. For a magnetic float level gauge, the luminous wheel also includes a magnet steel. Under the action of magnetic force, the magnetic shaft or metal shaft moves up and down along the guide rail as the float moves up and down. , timely and accurately realize the local indication of the liquid level; or by winding the resistance wire on the guide rail, the corresponding liquid level value can be obtained by measuring the resistance value in the conductive circuit composed of the guide rail, magnetic shaft or metal shaft, wire and light source, etc. Realize continuous remote transmission of liquid level data. Pulleys, counterweights, coupling ropes or coupling straps can also be included to balance the luminous wheels. The invention has the remarkable characteristics of simple structure, clear and eye-catching local indication, sensitive and accurate measurement, and continuous remote transmission signal.

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. . Background technique [0002] The liquid level gauge is an instrument with a wide range of applications, and many people study the problems existing in the prior art. [0003] Existing liquid level measuring instruments are of various types, each with its own strengths, but also have shortcomings. Based on the present invention, the existing instruments have unclear on-site indications, are difficult to observe in dark places or at night, and remote signals are not clear. Continuous, remote transmission and local indication use two sets of mechanisms, and a series of problems such as large friction affecting measurement accuracy, etc., the existing comparative technologies are described as follows: [0004] - Existing local indicating type and / or additional float type liquid level gauge with remote transmission ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/40G01F23/44G01F23/42G01F23/72
Inventor 王嘉贤王媛媛刘勇刘秋实
Owner DALIAN CONSERVATION SCI & TECH CO LTD
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