Portable liquid level gauge

 

(57) Abstract:

Usage: the invention relates to the instrument and can be used in various industries for measuring the level of liquids in tanks. The inventive measuring traction body made of a fiber-optic light guide, one end of which is connected to the light source, and the other through the light receiver with the counting device, a standalone power source enclosed cargo, the bottom of which is equipped with a movable contact, and the winding dimensional traction unit is equipped with protivosnaryadnym managing device. 2 C. p. F.-ly, 1 Il.

The invention relates to the instrument and can be used for level measurement of liquids in tanks.

Known liquid level gauge containing partially immersed in the liquid and suspended in a vertical position sensitive element in the form of a buoy which is connected by means of a metal cable with a measuring drum mounted on the shaft of the servo motor smatyvayus and winding the rope of the buoy and resulting in a rotation of the mechanical counter liquid level.

The disadvantages of this device avania, and low accuracy.

The closest in technical essence and the achieved effect of the present invention is a portable liquid level gauge, selected as a prototype. The sensor includes a measuring traction body in the form of a tape device with its winding and secured to the end of the sensor end position in the form of an ultrasonic emitter and receiver, as well as indicator and an Autonomous power supply.

Measurement of liquid level based on determining the difference between the true elevation of the installation of the sensor above the bottom of the tank and above the liquid surface. The elevation values are determined through the observation window on the scale, measuring tape, and the end position of the height is fixed by means of the ultrasonic sensor.

The disadvantages of this device are the complexity of the design, and low accuracy.

The aim of the invention is to simplify the construction and increase measurement accuracy.

The objective is achieved by measuring the traction body made of a fiber-optic light guide, one end of which is connected to the light source, and the other through the light receiver with the counting device, independent source Pitango traction unit is equipped with protivosnaryadnym managing device. These characteristics are essential to achieving the goal because:

1. Dimensional traction body made of a fiber-optic light guide, one end of which is connected to the light source, and the other through the light receiver with the counting device, to ensure removal of the signal about the level of the liquid based on the total bend radius of the fiber and ensure its effectiveness. This is also achieved high accuracy measurements. In addition, this structural feature contributes to the simplicity of the design and maintenance of the transmitter.

2. Autonomous power supply enclosed cargo, the bottom of which is equipped with a movable contact, to ensure operability of the sensor with internal amplitude modulation of the light intensity due to the inclusion of the power source at the interface, which is fixed a movable contact in the form of an elastic membrane.

3. The winding dimensional traction unit is equipped with protivosnaryadnym managing device to eliminate instrumental errors of the device by ensuring that the normal tension of the wound with the fiber device message protivoinfektsionnogo after ustroistvye fiber optic light guide device with its winding depending on the height of the tank, in which measurements are made.

Analysis of the proposed device with the prototype shown in the table.

Comparative analysis of the prototype allows us to conclude that the proposed solution meets the criterion of "novelty". Analysis of the known technical solutions (analogues) in the study area leads to the conclusion about the absence of these symptoms that are similar to the essential distinguishing characteristics of the proposed technical solution, and recognize it meets the criterion of "Significant differences".

The drawing shows a schematic diagram of the transmitter.

Portable liquid level gauge comprises a cylindrical hollow body 1, inside of which is mounted for rotation on axes 2 and 3, the winding dimensional traction unit, for example, in the form of a drum 4 stop 5.

Axis 2 has a sleeve 6 and is rigidly fixed in the body of the housing 1, and axis 3 is equipped with at least three gears 7-9 and installed at one end with a gear 7 from the end in the housing bore of the drum 4, which is provided on the entire length of the grooves on the shape and size of the gear 7. The intermediate portion of the axle 3 is installed in the bore of the housing 1, which is equipped with protivopoloznom control device in the form of a drum 10, the upper surface of which is provided with a notch 11 and pin 12, is made along the entire length of the generatrix of the drum 10 and within the locking tabs 13, made in the body of the housing 1.

Inside the drum 10 from the side of the housing 1 is made grooves on the shape and size of the gears 9 and set the plate spring 14, one end of which is fixed in the body axis 3, and the other in the body of the drum 10.

The drum 4 is wound with a fixed step-dimensional traction body made of a fiber-optic light guide 15, one end of which emerges from the end face of the drum 4 and is connected for rotation with the receiver 16 of the light (for example, photodiode) mounted in the sleeve 6 and is electrically connected with the counting device 17.

The second end of the fiber optic light guide 15 is rigidly fixed inside the split housing of the load 18 (for example in the form of a sphere and connected to a source 19 of light (e.g., led) mounted in a conical light deflector 20 and connected with one pole of an Autonomous power supply 21 power supply, the second pole of which is connected with a movable contact in the form of an elastic membrane 22 is installed in the bottom case base cargo 18.

The device works sleduet on the drum 4, being stationary, the gears 7 and 8 are fastened with the slots, respectively, in the body of the drum 4 and the housing of the device 1.

The condition of equilibrium of the system

Gt= Rx, (1) where Gt- weight;

Rx- reaction force support (mating gear 8 with the slots in the housing 1).

By turning the drum 10 lead the leaf spring 14 by an amount proportional to the height of the tank, which measure the liquid level. By clicking on the drum 10 is injected engages its tabs 12 tabs 13 of the device with the moving axis 3 and the output from the coupling gear 8 with the slots in the housing 1 and the drum 4 starts to rotate with a speed

V= R (2) where R is the radius of the drum;

- the angular velocity of the drum.

When this rotation for the angular velocity can be written

= , (3) where1- the angle of rotation of the drum;

t - time rotation;

1= f(Fpanel), (4) where Fpanel= -k2;

Fpanelthe force of elasticity of the leaf spring 14;

2- the angle of rotation of the spring 14;

K - coefficient of elasticity of the plate spring 14.

During the rotation of the drum 4 is winding him of fiber fiber is b) due to differences in the densities of these environments and the change in resistance of the medium at the

FupRx, (5) where Fupthe force of elasticity of the elastic membrane;

Rx- the power of resistance of the environment.

Elastic membrane 22 bends and closes contact an independent source 21 power, this enables the source 19 of the light and starts fiber optic sensor.

Given that the fiber light guide 15 is wound on the drum 4 with radius R, we can write the expression for length

lo= 2 Rkn, (6) where lo- the length of the fiber optic light guide, and the condition for maximum light transmission lo/d 2000 (3), where d is the diameter of the fiber;

Rkthe relative radius of curvature of the fiber.

n is the number of turns of the fiber.

When the falling load 18 to the boundary line of the fiber optic light guide leaves the drum at length

l1= 2 Rka1, (7) where a1- the number of wound turns.

During transition from a phase of the movement in magiccontrol space in the movement phase in the liquid to the bottom of the tank is included in the work of the fiber optic (EO), the aperture of the radiation which can be written in the General form (4)

f(3)= fOVHf (3) (s), (8) where f(3) - aperture of nepravovogo can be divided into straight section of the coiled fiber to the vessel bottom l2= 2 Rka2where a2- the number of wound coils and a curved section with a radius of bend (4):

Rk= R= (nc+nu)/(nc-nu), (9)

ncand nuthe refractive indices respectively of the core and the shell,

and length l3= 2R(n-a2) (10)

Aperture is a straight length of fiber is described by the expression (4)

ANDabout2= nc2-nu2(11)

The relative aperture of the curved section of the waveguide is described by the expression (4)

= . (12)

Due to the fact that the length of the beam in a bent fiber in 1+ times more than direct, and that in direct light guide input and output amplitudes, and she bent more, the full aperture of the fiber optic Converter will be expressed by the sum of the focal straight and curved sections, i.e. the total power of GPS at the beginning of the operation of the sensor at the interface gas-liquid

AND2= ANDabout2+r2(13)

The total aperture of the GP when the cargo 18 under the action of the elastic force of the plate spring 14 to the bottom

AND2= ANDabout2+r2(14).

Thus changing the aperture during movement of cargo from 18 border="ptx2">

As a1= and a2= , transforming the expression (15), we can write

A= (16)

l1-l2= h - the height of the liquid level.

The height of the l1is determined by the GP at the circuit movable contact 22, and the height of the l2is fixed by elastic force of the plate spring 14, the amount of twist which is proportional to the height of the tank from the filler neck until it bottoms on the calibration table.

Thus the expression for the liquid level can be written:

h= . (17)

We offer portable liquid level gauge can also work in free-fall of cargo to the boundary line (assuming its positive buoyancy). Thus, the plate spring 14 is not cocked, and performs the function protivoinfektsionnogo device, stopping the drum 4 when the load 18 media boundaries. For winding fiber optic light guide 15 on the drum 4 and the axis 3 by means of the drum 10 is taken off to the extreme right position, the gears 7 and 9 are in conjugation with the slots, respectively, in the body of the drum 4 drum 10. Rotation of the drum 10 make winding the optical fiber on the reel 4.

The proposed sensor is in contrast to the PDF of the prototype is the visual removal of the signal level, in the proposed device using fiber optic Converter with internal amplitude modulation of the light intensity, with higher accuracy and enabling the automation of reading about the fluid level.

(56) crude oil Supply. M. , 1980 (CLAYPANS. Scientific-technical abstract collection. vol. 3). The Rosemount series 801 manufactured by Enraf Nonius (Netherlands).

USSR author's certificate N 1137318, CL G 01 F 23/22, 1985.

Zack E. A. Fiber optic converters with external modulation. M. : Energoatomizdat, 1989, S. 128.

Weinberg C. B. , and Sattarov D. K. Optics fiber optic cable. , Ed. 2nd, revised and supplementary Leningrad : Mashinostroenie, 1977, S. 320.

1. PORTABLE LIQUID level GAUGE, comprising a housing holds dimensional traction body, one end of which is connected to the load, and the other with the winding mechanism, an Autonomous power supply and display unit, characterized in that, to improve accuracy and simplify the design, dimensional traction body made of a fiber-optic light guide, one end of which is connected to the light source, and the other through the light receiver with a display unit, a standalone power source accommodated in the housing, kotronis node.

2. The sensor under item 1, characterized in that the movable contact is made in the form of an elastic membrane.

3. The sensor under item 1, characterized in that protivoerozionnye unit is designed in the form of a drum, inside which is mounted a plate spring.

 

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