SU1793252A1 - Float level gage - Google Patents

Description

The invention relates to instrumentation and can be used to measure the level and density of a liquid.

The purpose of the invention is to improve the accuracy of level measurement and expand the scope of application.

. In FIG. 1 shows a float level gauge, general view; figure 2 - section A-A in figure 1; in fig. 3 - view B in Fig. one; in fig. 4 - 10 pointer indicating device with circular scales of level, density and level float.

The float level gauge contains the first 3 and second 4 level sensors installed in the container 2 filled with controlled 15 liquid 1 . Each of the sensors 3, 4 is made in the form of a float 5 connected to the counterweight 6 by a flexible link 7 thrown over the pulley 8. On the shaft 9 of the pulley 8 20 of the first sensor 3, the pointing arrow 10 of the indicating device is rigidly fixed. The indicating device of the float level gauge is also equipped with a circular scale 12 of the liquid level and mounted 25 with the possibility of rotation relative to the latter density circular scales 13 and a liquid level float 14. Scales 13, 14 are mounted on the shaft 11 of the second level sensor 4 by means of brackets 15 and 30, fastened to the latter with clamps 16. To expand the range of measured levels, the shaft 9 can be connected through gears 17 with additional pointing arrows 18, 19, showing 35 tens and hundreds of centimeters, respectively.

In the case of using the level scale* itself to determine the level floats 12, the horizontal cross-sectional area of the float 5 of the second level sensor is taken from the expression where F ₂ and Fi are, respectively, the horizontal cross-sectional areas of the floats 5 of the second 4 and first 3 level sensors;

P ₂ and Pi - respectively, the weight of the floats 5 of the second 4 and first 3 level sensors;

Rpr2 and R _PR 1 - respectively, the weight of the counterweights b of the second 4 and first 3 level sensors.

Float level gauge works as follows.

At a constant liquid level 1 of the float-counterweight system of each of the sensors 3, 4 are in equilibrium, while the depths of immersion (settlement) of floats 5 and liquid 1 are equal to hi = h ₂ =

Pl - Ρπρ1 yFi

Ρ2 - Ρπρ2 γ f ₂ ' (2) And (3) where hi and h ₂ - respectively, the depth of immersion of the floats 5 of the first 3 and second 4 level sensors;

γ is the specific gravity of the controlled liquid 1. '

Subtracting equation (2) from (3) and taking into account that h ₂ - hi - Hi - H ₂ , after transformations we obtain

Fl (P ₂ - Rpr2) - F ₂ (Pl - Pnpi)

Fi-F ₂ (Hi - H ₂ )' ^{1 1} where Hi and H ₂ are liquid level readings, respectively, for the first 3 and second 4

Level sensors.

The float level gauge is calibrated provided that the floats 5 are installed in the reference liquid, in this case the sediment of the float 5 of the first sensor 3 is

U. _ Pl ~ Pnpi _b1e _... - _WP -.

(five)

F ₂ =

Fi (Р ₂ - Рpr ₂ ) 7[Pi - Pnpi) ' (1) where y _e is the specific gravity of the reference liquid.

When changing the specific gravity (density) of liquid 1, an error occurs, determined by the expression

AH = hi-h _l3 =(6) . Substituting the value of y from (4) into (6), we obtain

ΔΗ-. ^R| X

fi

FrF2(Hi—Hg)____ _ 1

Fi(p2 - Рpr2) - F2(₽1 - Ρπρί) Ue (7) ) Scales 13, 14 are divided according to *θ with equations (4) and (7), from the condition that р= у/g. where p is the density of the liquid; g Gravity acceleration.

When calibrating the float level in the reference liquid, remove the clamps ^! 16 and scales 13,14 are rotated relative to 40 of the brackets 15 until the level float on the dial 14 aligns with the pointing arrow 1.0, after which the clamps 16 are installed again, while the position of zero on the scale 14 coincides with the density value on the density scale 13, equal to the density [ty reference liquid.

In the case of a rise (decrease) in the melting level, 5 sensors 3. 4 move up (down), which leads to the rotation of the shafts 9. 11, and thereby the arrows 10, 18, 19, proving the level on the scale 12, and scales b. 14. When measuring the level of the reference }:liquid, scales 13, 14 and arrow 10 rotate ³ θ synchronously, so arrow 10 provides a level correction on scale 14 equal to zero, and on scale 13 - a density equal to the density of the reference liquid.

! If the density of the controlled liquid 1 differs from the density of the reference

I

I liquid, the zero of the scale 14 is shifted relative to the arrow 10. In this case, the arrow 10 on the scale 14 shows the magnitude and sign of the level correction AH, and on the scale 13 - the density of the controlled liquid. The actual value of the level Нf is found by the expression

Nf = 1 + AN. (8)

Subject to equation (1), substituting the expression F2 by (1) into (7), we obtain

ΔΗ-Η1-Η2-(9)

those. the level correction value is equal to the difference between the readings of the liquid level 1 for the first 3 and second 4 sensors minus the constant (the constants are subtracted when the device is calibrated). In this case, there is no need for a scale of 14, since the actual value of the liquid level can be found by the expression

Ηφ»Ηι+(Ηι-Η2) = 2Ηι-Η2. (10) _with

When the value is found, the role of the indicating arrow for Hg is performed by the mark 20 on the scale 13 corresponding to the density equal to the density of the reference liquid (see Fig. 4).

Providing the possibility of finding the correction of the liquid level depending on its density, allows you to increase the accuracy of measuring the liquid level. The possibility of parallel measurement of liquid density expands the scope of the float level gauge.

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Claims (2)

Claim 1. Float level gauge containing the first level sensor in the form of a float connected to the counterweight by a flexible link thrown over a pulley, and an indicating device, characterized in that, in order to improve the accuracy of level measurement and expand functionality, it a second level sensor 50 was introduced, structurally similar to the first one, the pulley shaft of which is located concentrically to the pulley shaft of the first sensor, the indicating device is made in the form of a pointer device with circular scales 55 of level, density and level corrections, while the pointer of the device is rigidly fixed on the pulley shaft of the first sensor, density scales and level corrections - on the shaft of the second level sensor with the possibility of rotation relative to the level scale. 2. The level gauge according to claim 1, characterized in that the areas of horizontal sections of the floats Fi and F2 of the sensors are selected from the ratio F2/Fl=(P2-Pnp2)/2(Pl-Pnpl). where Pi and Rg are the weight of the floats of the first and second sensors, respectively; Рpr1, Рpr2 ~ weight of counterweights, respectively, from the first and second sensors. W3252 Redamir 1ehred m.mirgengal corrector b. ixjcko .Order 496 Circulation Signature VNIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab, 4/5 Production and publishing plant Patent, Uzhgorod, Gagarina st., 101