SU666435A1 - Liquid level sensor - Google Patents

Description

The cocTOiis sensor is made of a spiral pipe Ij of a full-length mz non-magnetic material; - Evmoteggen 2 excitation, measuring winding 3. The amy of the unstable float 4 with the screen # 1 of the screen with 5 si stops 6. The winding 2 of the wearable aa measuring winding 3 is located coaxally along the measured one. range 1st.

Measuring winding 3 consists of tw. X contiguous sections, B1cliche1.Hell, each of them is stepped at intervals, equal to njmm of the electromagnetic screen 5 of the float 4. The latter is made in the form of a thin-walled cylinder of non-magnetic material facilitated by lightweight. On the upper and kizhHefs parts of the postavta, there are stops 6 of the needle type. Inside the float 4 along the longitudinal axis of the float there is an electromagnetic O; strand 3. Excitation winding 2 and measuring H8E winding 3 is protected by a sealed cover, and, mg; ohm of the dark part, an opening for the end of the piping 1).

O6h "OTK; 3 is connected to an instrument 8.

The center of gravity of the floats 4 is determined by the scale and the magnetic electromagnetic screen 5 BfiyrpM by the shop, chosen as such; in order to leave the plate between the center of the bulk displacement and the state center G OS a1 - ;: s, this is the same for eTasEOBHTCfi dynastMTSsecxK -stable.

The device works in the following way.

Prohsii.schy through sbmogku 2 excitaton KDE g kersmenigy current excitaton kdaet electromagnetic glycol, uniform along a float range peremeteni 4. Due zsgreshyugo compound shdentichnch section 3, UCi nzzodnmye in a gel-lzmerk field winding 3 sbmotkn two mutually kolpensiruyuts to the output sensor selects of the magnitude of the emf, navykzz in the measuring winding 3 electromagnetic screen, 5, | Selected by Christborough -. eight.

, snapshot is set to a half-float 4 s guide-tube 1, During operation, the HS float acts as a & The hardness G, GER and 1 kenka in the center of the TYACKEST C, and the iodinna csuia P, which operates at the exact point of application of the vertical POWER OF water pressure B, which is the center of the removable water displacement.

Since the HeycTofpufBi dnahavok dnnamngsgskk, go it moves in the pipe 1 at some angle.

In the course of work, the internal surface iron-I pipe is wetted by a controlled flow rate 7. If the current time level of the measured distance is unchanged, the Sh53 changes with the mayor of ekoreti, which is important for managing many technological

processes, a blessing is created on the walls of the guide tube above the surface of the solution (favorable conditions for removing the remaining solution, resulting in the float 4 of the fur merging with the pipe wall at the point of contact A (crystallization unit). If the liquid drops below the upper stop 6 the float 4 then on the float relative to the point A acts torque

(one)

MgpXQ.e-sinfcfc + p)

where the distance between the point of crystallization A and the center of the solid of the float C;

and the angle of inclination of the float relative to the axis of the guide tube 1; - the angle between the longitudinal. the axis of the float 4 and the segment connecting crystallization point A with the center of the gravity of the float C.

This moment leads to the rotation of the float 4 relative to point A and the destruction of the crystallization unit.

For a dynamically stable float, expanding verararauierocH vertically in pipe I, and for which the center of gravity C is always located below the center of displacement w In, under aalogical conditions the moment is valid

H Q-t Sinpi (2)

From the expressions () and (2), it is clear that MDR M, in this case, the moment Mgp acts more effectively on the destruction of the crystallization unit as compared to the moment M, acting on the peel.

If the liquid rises above the upper | b torus of the float 4, then the displacement center B moves to the geometric center of the float SI becomes higher than the center of the cusp C. In this case, the buoyant force FB acts on the float 4

(3)

and torque

Mpp q-brnqV-b-C (4)

The rotational moment tends to turn the POSHG8VOK into a vertical position and contributes to the destruction of the crystallization unit,

In a danamically stable float in ana / yuga conditions, only the pushing force acts.

Thus, as with elevation ,. and when the level is low, the mobility of the Pinamcch of the unstable float is higher than that of the dynamically stable float, which contributes more {{ndezhns to the operation of the level sensor).

At the same time, the float itself destroys the crystallisations arising from the residual K & S of the propellant on the slings of the guide tube