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)
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
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
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.
FIELD: measuring engineering.
SUBSTANCE: method comprises locating extremums of the profile of spatial gradient of the heat exchange coefficient of the distributed sensor of a meter for measuring temperature profile, which is provided with a built-in heater, by repeatable heating of the sensor and measuring the current profile of the heat exchange coefficient from the formula
where mc, and S are the parameters of the sensor (m is the mass, c is the heat capacity, and S is the area of the outer side), P(z,ti) and P(z,ti+1) are the values of heating power, and are the profiles of temperature measured by the sensor, and are the profile of temperature derivatives at time ti and ti+1, and calculating the current profile of spatial gradient of the heat exchange coefficient . The location of the interface is assumed to be the location of extremums at this profile. The current profile of the heat exchange coefficient is determined from the formula proposed.
EFFECT: enhanced accuracy of locating and expanded functional capabilities.
1 cl, 6 dwg
FIELD: measuring engineering.
SUBSTANCE: method comprises setting heating and non-heating thermistors of meters for measuring temperature profile, determining current temperature profiles, calculating current profile of heat exchange coefficients of the thermistors from the formula
where P(z,t) is the current power of heating of the thermistor at point z; m, c, and S are the parameters of the meters for measuring temperature profiles (m is the mass per unit length, c is the heat capacity, and S is the area of the outer side); is the current profile of temperature of the heating thermistor; is the current temperature profile of the non-heating thermistor, and calculating the current profile of the spatial gradient of the heat exchange coefficient . The location of extremums zm at the profile is assumed to be the location of the interface.
EFFECT: enhanced accuracy of locating and expanded functional capabilities.
FIELD: test engineering; measurement technology.
SUBSTANCE: indicator can be used as detector of presence of fluid in containers, in particular, in high-voltage discharge conduits of different purpose diesel engine. Indicator has housing, radiation source, reflector, radiation receiver and signal processing unit. There is working cavity in central part of the case. Reflector is disposed inside the cavity onto frame with two parallel channels. Radiation source is disposed in one channel and radiation receiver - in the other one. Radiation source and radiation receiver are connected with signal processing unit fastened to top part of plate. Plate is disposed inside case under frame. There hole for feeding fluid at lower part of side wall of working cavity. There is drainage hole in top part side wall of working cavity. Top cap of the cavity is made in form of screw. Frame is connected with case by thread.
EFFECT: simplified design; reduced cost.
FIELD: engineering of equipment for measuring height of liquid column in vessels filled with specific liquids, for example, sewage water.
SUBSTANCE: device for determining height of liquid column in a vessel includes vessel with pipe, measuring device and air feeding device. Also, one end of pipe is connected to air compressor, while another, open, one is provided with protective mesh and positioned inside the vessel near its bottom. Pipe is provided with locking valve and measuring device, for example, manometer, placed after the locking valve.
EFFECT: simplified construction, facilitated measurement of liquid column height.
FIELD: measuring technique; oil industry; chemical industry.
SUBSTANCE: method can be used for checking level of liquid in reservoirs, for example, at petrol stations. At least one measuring bar is placed in container; there are marks applied onto measuring bar. Image of measuring bar is transmitted by means of TV camera fixed to float (water-proof case of camera can be also made in form of float) through TV signal transmission channel to TV image introducing device and digital computing device, where calculation of level of liquid is performed on the base of digital representation of received original image. Float of waterproof case of TV camera made in form of float is capable of free movement in vertical direction when level of liquid changes. Signal received by TV camera does not depend on position (warps) of float as determination of level of liquid is performed on base of image of glowing areas on surface of light guide, which areas are disposed within field of view of camera. To perceive information, camera needs a small highlight, as camera is located close to measuring bar. When using light guides as measuring bars, highlighting is not required. Precision of result of measurement if defined by technological abilities of microscopic roughness application only with specified pitch onto surface of core of light guide and by resolution of chamber.
EFFECT: very high precision.
FIELD: control equipment.
SUBSTANCE: liquid level fiber-optic signaling device can be used for signaling on availability or absence of liquid inside area of measurement, which liquid is transparent for IR-radiation. Device has radiation source and receiver, feeding and removing optical fibers and sensitive element. The latter is made in form of rod having round cross-section; the element is made of optical transparent material, for which the following requirement is met: n0<nair.av<n1, where n0, nair.av and n1 are refractivity factor of liquid, air and rod correspondingly. Length L of rod is described by formula. R is radius of spherical segment of light-guide turned in the direction of media to be measured: 1,5dfe<=R<=2dfe, where dfe is diameter of envelope of optical fiber. R/L relation should meet specific conditions.
EFFECT: higher manufacturability of sensitive element's structure.
FIELD: measuring technique.
SUBSTANCE: liquid level meter comprises cylindrical housing (2) whose inner space is in communication with the liquid through passages (5). Float (10) mounted in housing (2) is coated with a mirror layer. Emitter (11) and receiver (12) of radiation are connected with the space of cylindrical housing (2) through optical switch (13) made of a disk provided with ports. The surface of the disk is coated with a reflecting layer. The optical switch has corner reflector. Unit (15) is connected with the emitter (11) and receiver (12) of radiation and drive (14) for rotating the optical switch. The liquid level meter is additionally provided with step cylindrical nozzle (6) having base (7) for fastening to the neck of the reservoir, second corner reflector, and glass baffle (8) that separates hollow cylindrical nozzle (6) into stages. The small diameter stage receives tube (1) provided with housing (2) of the liquid level meter. The ring space between the tube and the housing is closed by baffle (3) with reflecting layer (4) on its inner side to prevent a contact with the liquid. The large diameter stage of cylindrical nozzle (6) receives optical switch (13) one port of which receives the first and second corner reflectors. Emitter (11) and receiver (12) of radiation and drive (14) of optical switch (13) are mounted on base (7) of the step cylindrical nozzle (6).
EFFECT: enhanced precision.
SUBSTANCE: given sign of product is determined by means of the first method of measuring at which the first physical properties of the product are explored, in addition the given sign is determined with, at least, the second method of measuring which is grounded on the second physical properties which differs from the first physical properties, odds of values of the mentioned given sign gained by means of both methods of measuring are determined, and the mentioned odds of values are compared to the given threshold and in case the specified odds of values exceeds the specified threshold, solution on infringement of integrity of the mentioned yield is made.
EFFECT: increase of reliability of product integrity determination.
4 cl, 3 dwg
FIELD: instrument engineering.
SUBSTANCE: invention refers to control and measurement equipment and can be used for measurement (control) of liquid level in reservoirs. Essence of invention: level gauge includes vertically oriented transparent tube (1) that communicates with controlled reservoir. Float (8) with light source (7) located in this tube forms narrow round (0.2÷0.3 mm) laser beam at some angle α. Round translucent tube there are long flat (planar) beam guides (9) that have two layers. The first layer forms dense semi translucent mirror coating (mirror is inside of beam guide). The second coating layer - light-tight - is complete coating from 3 sides of beam guide that forms cross line code screens (10) from the 4th side. On the one end of beam guides there are photosensors (photodiodes) (5) connected to decoders (3) with digital output through sharpener-amplifiers (4). Float light source (7) is fed by power transformed by high-frequency generator the output circuit (12) of which is wound over beam guide code sensors.
EFFECT: liquid level non-contact measurement, flow metre readings output is performed in digital form to indicators (2) that can be transmitted to computer (1), for instance for production of liquid level dynamic measurement (or pressure drop).
SUBSTANCE: invention relates to electrothermics field, particularly it concerns to regulation of process variables at manufacturing of fused phosphates, calcium carbide in ore-thermal furnaces and can be used in non-ferrous metallurgy. Regulation method of melt level in bath of ore-thermal furnace includes regulation of phase voltage and electrode current. Additionally it is measured value of constant component of phase voltage, and level of melt at specified value of current is defined according to formula: H=K*Ucc, where H - melt level, mm; Ucc - value of constant component of phase voltage, mV, K - coefficient, depending on value of phase voltage, mm/mV.
EFFECT: achievement of high accuracy of measurement.
1 dwg, 1 tbl, 1 ex