RU1777005C - Liquid level gage - Google Patents

Abstract

Usage: the invention relates to measuring technique and allows to simplify the design and expand the scope. SUMMARY OF THE INVENTION: the level gauge comprises a float (P) 1, a counterweight 2, and a flexible link (GB) 4 thrown through the measuring pulley 3. The left branch (B) of 5 GB 4 is attached to P 1 and the right 6 to the counterweight. Below the minimum fluid level 8, tap-off units 9 are installed through which left B 5 is stored. The attachment points 10 GB 4 and P 1 and counterweight 2 are on the same level. For any measured level and density of the liquid, the sum of the heights of the left part B 5 and the right B 6 is equal to the height of the central part 16 of the left B 5, and the sum of the heights of the left part 15 B 5 and part B b located in the liquid is equal to the height of the section of the central part 16 to 5 contained in a liquid, i.e. the flexible link balances itself, without affecting the level gauge. 1 ill.

Description

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with

 Vj

Vj o

8

The invention relates to measuring equipment, in particular to liquid level measuring devices, and can be used in various industries and agriculture.

The purpose of the invention is to simplify the design and expand operating conditions.

The drawing shows a General view of the liquid level gauge.

The level gauge contains a float 1, a counterweight 2, and a flexible link 4. Thrown from the measuring pulley 3. The first branch 5 of link 4 is connected to the float 1, and the second 6 is connected to the counterweight 2. The float 1 and the counterweight 2 are mounted with the possibility of movement in the tank (well) 7, filled with a controlled fluid 8. At an altitude below the minimum fluid level 8, outlet blocks 9 are installed with the possibility of being located in the latter, through which the first branch 5 is stored. The attachment points 10 of the flexible link 4 on the float 1 and the counterweight 2 are located at the same height.

The shaft 11 of the measuring pulley 3 is connected to an angular displacement transducer 12 into an electrical signal. An electrical signal from transducer 12 is transmitted through communication line 13 to indicating device 14. Counterweight 2 must be designed with negative buoyancy.

The level gauge works as follows.

At a constant liquid level 8, the float-counterweight-flexible system is in equilibrium, which can be described by the equation

Y Vn Pn - Ppr + Y Vnp + F y2-pl -

- F y2 11l + F ytbn - F Pll Y + + R. Ntslzh -yF hnx -y Pn-Pnp + yx X Vnp + F Yi (Ill - bl + hn) + - FX - xy (bl - pl - hnF) ,(1)

where y is the specific gravity of the liquid 8; 50

Vn is the volume of the 8 parts of the float 1 immersed in the liquid;

RP and RPR, respectively, the weight of the float 1 and counterweight 2;

Vnp - counterweight volume 2; 55

F is the cross-sectional area of the flexible link 4;

Y2 specific gravity of the flexible link 4;

Plll - the height of the left side 15 of the first branch 5 of the flexible link 4;

Itsl is the height of the central part 16 of the first branch 5;

hn is the height of the second branch 6;

ptslzh — height of a portion of the central part of the first branch 5 located in liquid 8;

Bn is the height of the portion of the second branch 6 located in the liquid 8.

Due to the fact that the flexible link 4 is attached to the float 1 and the counterweight 2 at points that are at the same level, the sum of the heights of the left part 15 of the first branch 5 and the second branch 6 of the flexible link 4 is equal to the height of the central part 16 of the first branch 5, and the sum of the heights the left part 15 of branch 5 and the part of branch 6 located in liquid 8 is equal to the height of the portion of the central part 16 of branch 5 located in liquid 8, i.e. equation (1) is converted to equation

At L / p Rp-Rpr + yV,

etc

(2)

15 0 5

0

5

0

5

0

5

It follows from equation (2) that the flexible link 4 does not exert any effect on the upsetting of the float 1 at any liquid level and density.

When raising (decreasing) the level, the float 1 and the counterweight 2 move up (down), which leads to the rotation of the measuring pulley 3. Due to the presence of tap blocks 9, the float 1 and the counterweight 2 move synchronously in one direction - up or down, as a result of which the counterweight 2 is always is in liquid. Proportional to the angle of rotation of the pulley 3, an electrical signal from the converter 12 is supplied to the device 14, showing the current liquid level 8.

The exclusion from the design of suspended chains, the absence of the need to adjust the mass of the chain in the liquid when the density of the latter changes, makes it possible to simplify the design of the level gauge. In addition, the proposed level gauge can be used to measure the liquid level in piezometric wells or in tanks buried in the ground, which expands the operating conditions of the level gauge.

Claims (1)

SUMMARY OF THE INVENTION A liquid level gauge comprising a float, a counterweight and a flexible link thrown through a measuring pulley, the first branch of which is connected to the float and the second to a counterweight, characterized in that, in order to simplify the design and expand operating conditions, it is provided tap-off units installed with the possibility of their location in of the controlled fluid at a height below the water blocks, and the fastening points are at a flexible minimum level, while the first connection on the float and the counterweight is located over the levers at the same height