CN2380916Y

CN2380916Y - Built-in all-immersed-float bidirectional-force-measuring type liquid-density measure instrument

Info

Publication number: CN2380916Y
Application number: CN 99234482
Authority: CN
Inventors: 李明
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-03-26
Filing date: 1999-03-26
Publication date: 2000-05-31
Anticipated expiration: 2009-03-26

Abstract

The utility model provides a fluid density measuring apparatus in a built-in full-immersion float bidirectional measuring force type. The utility model is divided into a single-float bidirectional measuring force type, a dual-float bidirectional measuring force type, and a single-float bidirectional stress measuring displacement type. The utility model is characterized in that the top and the bottom of a float are connected with a force measuring sensor by two rods or chords; liquid density can be calculated according to the change of stress or displacement of the top and the bottom of the float which is fully immersed in water. The utility model has the advantage of wide measuring range; the utility model can measure density of stationary liquid and on-line measure fluid; the utility model can be widely used for on-line measuring on production lines with high precision.

Description

Na puts type and soaks the two-way force-measuring type liquid density measurement of float entirely

The utility model relates to a kind of device that is used for liquid density measurement.Be characterized in that measurement range is wide, not only can measure, also can carry out on-line measurement by convection cell, can be widely used in and carry out high precision online measuring on the production line static liquid density.

At present the measurement mechanism about fluid density has many kinds, and commonly used have a float-type structure; The force-measuring type structure.Wherein the float-type structure is divided into float top load arrangement and float underneath type structure (number of patent application 95231841), and the principle that is adopted is float to be immersed in the liquid variation according to buoyancy measure density of liquid.Though this method is simple, but must be to the buoyancy of float less than the gravity of float for float top load arrangement requirement fluid to be measured, and must be greater than the gravity of float to the buoyancy of float for float underneath type structural requirement fluid to be measured, no matter be float top load arrangement or float underneath type structure, its measurement range is restricted, impact added the isolation of protection screen cloth to float for fear of fluid when this measuring instrument carried out on-line measurement, thereby measured value lags behind the increase error; The force-measuring type structure is that a heavy ball is dipped in (number of patent application 92232590) in the liquid, the buoyancy of heavy ball also will change when fluid density changes, measure the suffered power of heavy ball by LOAD CELLS and calculate density of liquid, because this method requires the suffered gravity of heavy ball must be greater than the suffered buoyancy of heavy ball in measurement, so its measurement range, the scope of application are restricted too.

The purpose of this utility model provides a kind of internally-arranged type and soaks the two-way force-measuring type liquid density measurement of float entirely, and this measuring instrument measurement range is wide, is suitable for high precision online measuring.

The present invention is achieved in that the utility model provides a kind of internally-arranged type to soak the two-way force-measuring type liquid density measurement of float entirely, and this measuring instrument is divided into the two-way force-measuring type of single float; The two-way force-measuring type of two floats; Single float bidirectional stress is surveyed displacement-type, and this measuring instrument comprises float, force cell or displacement transducer.Its principle is respectively float to be connected with force cell up and down by two bars or string, float connects two bars or string up and down when fluid density changes tension force or displacement also will change, the variable quantity that to go up lower pulling force or displacement by force cell or displacement transducer changes the variable quantity output of electric signal into, thereby realizes the measurement to fluid density.

Advantage of the present utility model and good effect are by to the two-way dynamometry of float, avoided existing float-type structure and force-measuring type structure only to float or the unidirectional dynamometry of heavy ball, thereby cause measurement range to be restricted and the measured value existing problem that lags behind, realized the purpose that the liquid in flowing is carried out on-line measurement; Calculate density of liquid by the variation of using the displacement of high-precision digital magnetic grid displacement sensor, reached the purpose that measurement range is wide, measuring accuracy is high.

The utility model is described in further detail below in conjunction with accompanying drawing.The two-way force-measuring type concrete structure of Fig. 1 list float synoptic diagram.The two two-way force-measuring type concrete structure of the float synoptic diagram of Fig. 2.Fig. 3 list float bidirectional stress is surveyed displacement-type concrete structure synoptic diagram.

Measurement for static liquid density: be illustrated in figure 1 as the two-way force-measuring type concrete structure of single float synoptic diagram.This device comprises float 1, container 2, pull bar 3,4, corrugated tube 5,6, liquid-inlet and valve 7, liquid outlet and valve 8, dynamometry foil gauge 9,10, set nut 11,12 parts such as grade.Respectively float is connected with force cell 9,10 about in the of 1 by two bars or string 3,4, open a hole at the center up and down of container 2, the pull bar 3,4 that is connected with float 1 passes corrugated tube 5,6 and dynamometry foil gauge 9,10 are connected, and by set nut 11,12 float are strained up and down.Closing containers outlet valve during measurement, make liquid by the full container of inlet stream, when fluid density changes, buoyancy will change, institute is stressed about the float also will change, change STRESS VARIATION in bar the variation output of electric signal into by the dynamometry foil gauge this moment, reaches the purpose of measuring fluid density thereby be connected with Displaying Meter.

Density for working fluid is carried out on-line measurement, is illustrated in figure 2 as the two two-way force-measuring type concrete structure of float synoptic diagram.This device is made up of parts such as a U type container 1, float 2,3, upper connecting rod 4,5,

lower link

6,7 corrugated tubes 8,9,10,11, dynamometry foil gauge 12,13,14,15, set nut 16,17,18,19, liquid-inlet and valve 20, liquid outlet and valves 21.Select same material, two onesize floats 2,3, put into two pipes of U type container 1 respectively, by two bars or string 4,5 respectively with float up and down with force cell 12,13,14,15 connect, upper and lower pull bar 4,5,6 with float 2,3 connections, 7 pass corrugated tube 8,9, and 10,11 apertures of opening down from container pass and dynamometry foil gauge 12,13,14,15 connect, by set nut 16,17,18,19 strain float 2,3 up and down respectively.Liquid is flowed into by inlet be full of container and from the outlet outflow, make flow rate of liquid stable, this moment, float was subjected to lower pulling force, buoyancy, gravity, viscous force effect.Two floats are subjected to the viscous force opposite sign but equal magnitude of fluid effect, cancellation unknown quantity viscous force establishes an equation, by the dynamometry foil gauge respectively with two floats up and down the variable quantity of two ends pulling force change the variable quantity output of electric signal into, thereby the fluid density that reaches in flowing that is connected with Displaying Meter carries out on-line measurement.

As shown in Figure 3, survey displacement-type concrete structure synoptic diagram for single float bidirectional stress.This device comprises parts such as container 1, float 2, spring 3,4, fixed spring stent 5, corrugated tube 6, displacement scale 7, magnetic grid displacement transducer 8, liquid-inlet and valve 9, liquid outlet and valve 10.Wherein, it is identical that float 2 connects two coefficients of stiffiness up and down, and the spring 3,4 that length is identical is connected with the bottom with container top, installs one in the float upper end and pass the Displacement Measurement scale 7 that container top is opened a circular hole, and this scale passes from spring.Closing containers outlet valve 10 during measurement, make liquid by the full container 1 of inlet 9 streams, when fluid density changes, the buoyancy that float 2 is subjected to will change, float is suffered spring 3 up and down, 4 pulling force also will change, the position of float this moment in liquid also will change, measure the displacement variable of passing the displacement scale 7 that circular hole that container top opens is connected with float by magnetic grid displacement transducer 8, change the variable quantity of this displacement the variable quantity output of electric signal into, reach the purpose of measuring fluid density thereby be connected with Displaying Meter.

Claims

1, a kind of built-in two-way force-measuring type liquid density measurement of float that soaks entirely, comprise single float and the sensor that fits together with float, it is characterized in that being dipped in entirely float in the testing liquid with two bars or string or spring are connected up and down, according to the suffered power of two bars or string or spring or the variation of displacement, measure the density of different testing liquids.

2, according to claim 1, the feature of the two-way force-measuring type measuring instrument of single float is by one group of dynamometry strain-gauge transducer two bars or the string that is dipped in entirely that single float in the testing liquid connects up and down to be carried out two-way dynamometry.

3, according to claim 1, the feature that single float bidirectional stress is surveyed the displacement-type measuring instrument is by magnetic grating displacement transducer the single float that is dipped in entirely in the testing liquid that is connected between two springs to be carried out displacement measurement.

4, a kind of built-in two-way force-measuring type liquid density measurement of float that soaks entirely, comprise two floats and the sensor that fits together with float, it is characterized in that being dipped in entirely two floats in the testing liquid with two bars or string or spring are connected up and down, according to the suffered power of two bars or string or spring or the variation of displacement, measure the density of different testing liquids.

5, according to claim 4, the feature of the two-way force-measuring type measuring instrument of two floats is by two groups of dynamometry strain-gauge transducers two bars or the string that is dipped in entirely that two floats in the testing liquid connect up and down to be carried out two-way dynamometry.