The method of determining the amount of liquefied gas in the container and the device for its implementation
(57) Abstract:The inventive effect of magnetic field on the container with liquefied gas, measure the magnetic permeability of the container with liquefied gas and is determined by the calibration curve, the amount of liquefied gas in the tank, and the calibration curve obtained from the results of N measurements of the integral magnetic permeability corresponding to N different predetermined values of quantities of liquefied gas in the tank. The device comprises an inductor wound on a cylinder with liquefied gas and electrically isolated from it, the sinusoidal voltage generator, the generator pulses, the frequency divider, clock, electronic key, the pulse counter, the element OR NOT, the pulse shaper reset register, a decoder, an indicator. 2 C and 2 C. p. F.-ly, 6 ill. The invention relates to measuring technique and is aimed at determining the amount of liquefied gas in the gas cylinder is used, for example, in devices for power supply of the motor vehicles of gaseous fuel stored in the liquid phase.The closest analogues to the invention are a method and apparatus for MEAs elastic vessel, filled with liquid and having a vertical tube, the liquid level which is judged on the amount of gas.A disadvantage of the known method and device is a strong dependence of the readings from vibrations and accelerations in the vertical direction, which virtually eliminates the possibility of the application of these inventions on a moving vehicle. The use of pressure gauges for supply of motor vehicles in liquefied natural gas uncomfortable, as their readings do not correspond to the amount of liquefied gas in the tank and, in addition, there is no possibility to monitor the readings from the cab of the vehicle is in motion.In Fig. 1-3 shows three different versions of devices that implement the claimed method; Fig. 4 is an experimental graph of the inductance coil, the core of which is a container with liquefied gas, the amount of liquefied gas in the tank; Fig. 5 is a structural diagram of a device for measuring the amount of liquefied gas in a gas cylinder; Fig. 6 is a timing diagram of his work.The method of determining the amount of liquefied gas in the gas tank is that the tank with liquefied gas is affected by the magnetic field, e.g. the Yu permeability of the container with liquefied gas. Before the actual measurement operations for calibration purposes, which include the dimension N of the informative parameter values corresponding to N different predetermined quantities of liquefied gas in the tank, according to the data from the gage curve, which determines the current amount of liquefied gas in the container during operation of the automobile engine.Integral magnetic permeability of the container with liquefied gas can be measured by various methods.From the integral values of the magnetic permeability of the container with liquefied gas depends on the inductance of the coil core, which is a container with liquefied gas (see Fig. 1). The method is implemented using coil 1 inductance covering the container 2 with liquefied gas, and 3 meter inductance, operating at low frequency (about 1 kHz).Integral magnetic permeability of the container with liquefied gas is proportional to the amplitude of the magnetic flux through the cross-sectional area of the container with liquefied gas, if the amplitude of the intensity of the alternating magnetic field (see Fig. 2). On the 4 cylinder with liquefied gas is wearing a coaxial two coils 5 and MW in her winding of an alternating current from source 7 current. The second coil 6 serves for measuring the magnetic flux in accordance with the expression
U = -d /dt = -oW(dI/dt), where the integral magnetic permeability of the container;
o- magnetic constant;
W - factor;
I is the current through the coil 5;
U is the voltage on the coil 6;
the flow through the cross-sectional area of the balloon.As a measuring device 8 can be used voltmeters amplitude, srednenapryazhennyh operating values, integrating voltmeters.Measurement of magnetic flux through the cross section of the container with liquefied gas can be detected by measuring the magnetic field near the end of the cylinder (see Fig. 3). The method is implemented using attached to the cylinder 9 coil 10 connected to a source 11 of a current that creates a magnetic field of a given intensity. The sensor 12 to the magnetic field, which can be made on the basis of the Hall sensor, the vibrating coil, etc. located near the end face of the cylinder 9. The output signal of the sensor 12 is registered with the appropriate measuring instrument 13. The magnetic field generated by the coil 10, which in this case can be either a variable sound frequency, and constant.In Fig. 1 shows achiev the NYM gas (see Fig. 1), the amount of liquefied gas in the tank calibration curve. From this graph it is seen that the inductance of the coil is uniquely related to the amount of liquefied gas in the tank. The measurements were performed at a frequency of 1 kHz. At high frequencies is the magnetic shielding internal volume of the container with its metal walls, therefore, the frequency range should be limited to audio frequencies.Device for determining the amount of liquefied gas in the container contains the coil 14 of the inductor wound on a cylinder with liquefied gas and electrically isolated from it, the generator 15 sinusoidal voltage, the driver 16 pulses, the divider 17 frequency generator 18 clock pulses, an electronic key 19, the counter 20 pulses, the element OR NOT 21, the imaging unit 22 of the reset pulse, the register 23, a decoder 24 and the indicator 25.Conclusions coil 14 of the inductance connected to the inputs of the generator 15 sinusoidal voltage, the output of which through the shaper 16 pulses connected to the input of the divider 17 frequency and the first input element OR NOT 21, a second input connected to the output of the divider 17 frequency control input of the electronic switch 19, the signal input of which 20 pulses, information outputs of counter 20 pulses through serially connected register 23 and the decoder 24 is connected to the inputs of the indicator 25 , the output of the element OR NOT 21 connected to the control input of the register 23 and through the imaging unit 22 of the reset pulse is connected to the reset input of the counter 20 pulses.The device operates as follows. The coil 14 of the inductance is connected to the oscillatory circuit generator 15 sinusoidal voltage, which is fed to the input of the shaper 16 pulses (Fig. 6A). Shaper 16 pulses, which can be implemented by using a comparator or Schmitt trigger converts the sinusoidal signal into a rectangular pulse (Fig. 6b) of the same frequency. The divider 17 frequency generates pulses, the frequency of which is several times less than the frequency of the sinusoidal signal (Fig. 6b). These pulses open electronic switch 19, and through him start to pass pulses from the output of the generator 18 clock pulses (Fig. 6g). At the output of electronic switch 19, which may be made on the basis of element And formed packs of pulses (Fig. 6D). The number of pulses in each packet is counted by the counter 20 pulses and stored in the register 23 to the command from the output of the reset is formed by a short pulse (Fig. G), which erases the contents of the counter 20. The decoder 24 converts stored in the register 23 code to the control signals indicator 25, which in the simplest case can be a line of LEDs. If you change the quantity of liquefied gas in the tank varies integral magnetic permeability of the gas cylinder, and hence the inductance of the coil 14, the core of which is a container with liquefied gas. When changing the inductance of the coil 14 varies the frequency of oscillator 15 and, consequently, the number of clock pulses received at the input of the counter 20 pulses. The choice of the transformation function decoder 24 is a compliance indicator 25 quantity of liquefied gas in the tank. (56) French Patent N 230891, CL G 01 F 23/20, 1976. THE METHOD OF DETERMINING THE AMOUNT OF LIQUEFIED GAS IN THE CONTAINER AND THE DEVICE FOR ITS IMPLEMENTATION
1. The method of determining the amount of liquefied gas in the tank, which consists in the fact that the measured N values informative parameter corresponding to N different predetermined quantities of liquefied gas in the tank, construct a calibration curve directly measure the value of the informative parameter and a calibration curve to determine the share of the m, the direction of which coincides with the longitudinal axis of the container with liquefied gas, and as an informative parameter selects the integral magnetic permeability of the container with liquefied gas.2. The method according to p. 1, characterized in that the container with liquefied gas effect an alternating magnetic field of audio frequency and integral magnetic permeability of the container with liquefied gas is determined by measuring the inductance of the coil, the core of which is a container with liquefied gas, or amplitude of the magnetic flux through the cross-sectional area of the container with liquefied gas at the specified amplitude of the magnetic field.3. The method according to p. 1, characterized in that the integral magnetic permeability of the container with liquefied gas is determined by measuring the magnetic field near the end of the container with liquefied gas.4. Device for determining the amount of liquefied gas in the tank containing the sensing element and the indicator, characterized in that it introduced a sinusoidal voltage generator, the generator pulses, the frequency divider, clock, electronic key, a pulse counter, a register, a decoder, a pulse shaper, sbro the lawn with liquefied gas and electrically isolated from it, the leads of the inductor is connected to the inputs of the generator of sinusoidal voltage, the output of which through the pulse shaper is connected to the input of the frequency divider and the first input element OR NOT, a second input connected to the output of the frequency divider control input of the electronic key signal input which is connected to the generator output clock pulses, and the output of the electronic switch is connected to the input of the pulse counter, the information outputs of which are connected in series through the register and the decoder are connected to the inputs of the indicator, and the output of the element OR NOT connected to the control input of the register and through the pulse shaper reset is connected to the reset input of the pulse counter.
FIELD: measurement technology; high-accuracy determination of liquefied gas mass in reservoir irrespective of its phase.
SUBSTANCE: three RF sensors of different length are placed in reservoir filled with liquefied gas. Sensors are connected to secondary converter. Length of first sensor vertically placed in reservoir corresponds to height of reservoir. Length of second vertical sensor is reduced from below by value no more than 0.35 of length of first sensor. Third sensor is located in gas phase of liquefied gas and its length is no more than 0.3 of length of first sensor. Each sensor may be connected to frequency-setting circuit of respective self-excited oscillator.
EFFECT: enhanced measurement accuracy; extended field of application.
2 cl, 3 dwg
FIELD: measuring engineering.
SUBSTANCE: water level alarm comprises the section of coaxial long line provided with inner conductor projecting beyond its end. The section is connected with the high-frequency generator and recorder. The generator is made of a self-excited oscillator. The section is connected to the frequency generating circuit of the self-excited oscillator. The recorder is made of a frequency meter. The projecting part of the inner conductor is made of two members of the same length, but different diameters. The diameter of the end part exceeds that of the other part of the projecting part of the inner conductor by a factor of ten. The projecting part of the conductor can be covered with a dielectric shell.
EFFECT: enhanced sensitivity.
1 cl, 5 dwg
FIELD: measuring equipment engineering.
SUBSTANCE: device has excitation winding, fed by alternating current and measuring winding, connected to alternating voltage meter. Both windings are enveloped by protective cover, placed in controlled electric-conductive environment. To provide for high sensitivity to level of environment and decrease of temperature error from influence of construction materials, conductors of measuring winding are distanced from excitation winding conductors for distance, equal to one to ten sums of thickness of protective cover and radius of excitation winding cable cover. Also provided are different variants of constructions of level meters both with solenoid and frame windings.
EFFECT: higher precision.
7 cl, 5 dwg
FIELD: measurement technology.
SUBSTANCE: first measurement of level of liquid is performed from value of measured electric capacitance C1 of first radio-frequency detector. Density of gaseous phase is determined on the base of value of electric capacitance C3 of corresponding radio-frequency detector. Simultaneously the second measurement is performed of level of liquid in reduced or increased range of change on the base of measured value of electric capacitance C2 of corresponding radio-frequency detector. Then functional conversion of measured electric capacitances C1, C2 and C3 is performed and dielectric permeability of liquid and gaseous phases is measured.
EFFECT: improved precision of measurement; widened functional capabilities.
FIELD: electric engineering equipment.
SUBSTANCE: device can be used for measuring electric parameters of two-terminal devices used as physical process detectors (temperature, pressure, level of loose and liquid matters and et cetera) at transportation vehicles and in systems for measuring level of filling of rocket-space equipment. Device for measuring level of dielectric matter has first and second measuring inputs, sinusoidal voltage source, equivalent circuit preset unit, standard which has first output connected with first input of switching unit, current-to-voltage converter, scaling amplifier and analog-to-digital converter. Switching unit is made to be multi-channel one, which has first measuring, input with second output of standard and with output of sinusoidal voltage generator. Control input of the latter is connected with first output of frequency-control unit. Measuring inputs starting from second to (n+1) are connected with corresponding inputs of switching unit which has output connected with first outputs of electric capacity and active resistance calculators through current-to-voltage converter, scale amplifier and analog-to-digital converter all connected in series. It is also connected with first input of measurement control input which has outputs connected with control inputs of switching unit, of scale amplifier and analog-to-digital converter as well as with first input of frequency control unit and with second inputs of electric capacity and active resistance calculators. Control input of measurement control unit is connected with control output of mode control unit which has outputs connected with second input of frequency control unit, with equivalent circuit setting unit, with first input of electric capacitance total increment calculator, with first input of level calculator, with first input of electric capacitance current increment calculator and with input switching control unit. Output of the latter is connected with second control input of switch unit. Output electric capacitance calculator is connected with second input of calculator of current increment in electric capacitance. Output of the latter is connected with second input of level calculator. Third and fourth inputs of electric capacitance and active resistance calculators are connected with output equivalent circuit preset unit and with second output of frequency control unit. Output of calculator of current increment in electric capacitance is connected with third input of level calculator. Output of the latter as well as outputs of active resistance calculator and switch control unit have to be outputs of the device.
EFFECT: improved precision of measurement; improved manufacturability; improved efficiency of measurement.
FIELD: electric measurement engineering.
SUBSTANCE: method can be used for measurement of electrical parameters of two-terminal networks used as detectors of physical processes (temperature, pressure, level of liquid and loose maters et cetera) at industrial installations, transportation vehicles and in systems for measuring level of setting-up of rocket-space equipment. Sinusoidal voltage is formed in capacitive level gauge and complex current is measured which passes through dry capacitive level gauge as well as through filled-in capacitive level gauge. Equivalent circuit of capacitive level gauge is specified which circuit consists of electric capacitance and active resistance. Sinusoidal voltage is formed in capacitive detector at two frequencies. After it complex current is measured through dry level detector and through reference detector for any of those frequencies. Results of measurement are registered, electric capacitance of capacitive level gauge is measured and registered and increment in electric capacitance of capacitive level gauge is measured and registered when submerging gauge into dielectric matter completely. Subsequent measurement and registration of complex current is carried out through capacitive level gauge filled with dielectric matter and through reference gauge for any of mentioned frequencies. For any periodical measurement the electric capacitance of capacitive level gauge is measured and registered. Relative filling of capacitive level gauge with dielectric matter is measured as difference of values of electric capacitance of dry capacitive level gauge and electric capacitance of filled-up capacitive level gauge related to increment in electric capacitance of capacitive level gauge submerged into liquid totally.
EFFECT: improved precision of measurement; improved adaptability to manufacture.
FIELD: measuring equipment engineering, possible use for measuring level of liquid products, in particular, oil and oil products in railroad cisterns.
SUBSTANCE: level meter for measuring level of liquid contains bar with single capacity level indicators, positioned along its length, bar is made in form of hollow elongated construction, inside the construction a pair of electronic boards is positioned in form of rods, mounted in parallel to one another and at fixed distance from each other, forming single capacity level indicators on opposite planes facing each other, by means of electrodes on one electronic board and common electrode on the other board. When measuring level of liquid, serial scanning of indicators is performed in pairs of following indicator with previous one and on basis of received scanning results, level of liquid is calculated.
EFFECT: increased manufacturability, reliability and precision when measuring level of liquid product.
2 cl, 2 dwg
FIELD: measuring level of melt metals, possibly in systems for controlling manufacturing processes in metallurgical industry, for example in apparatuses for thermal-magnetic reduction of titanium.
SUBSTANCE: device includes exciting windings and metal level pickups in the form of induction turns, computing unit. Said windings and level pickups are placed in pairs around vessel with melt metal. Computing unit is connected with level pickups. It provides possibility for scanning pickups, digitizing voltage values of pickups, approximating pickups readings of designed curve found according to decision of simulation task, calculating derivative of said curve and determining metal level according maximum value of derivative. Excitement windings of device are connected in series and they form electromagnet.
EFFECT: enhanced accuracy, lowered labor consumption of measuring process.
2 cl, 3 dwg
FIELD: measuring technique.
SUBSTANCE: fuel level meter comprises elongated capacitive sensor connected in the frequency-generating circuits of functional and base self excited oscillators. The main and additional counters generate the position code of the fuel level from the output frequencies of the self-excited oscillators. The level is indicated by the linear or pointer indicator provided with a converter of position code into the current of supplied to the pointer indicator.
EFFECT: reduced power consumption and enhanced reliability.
2 cl, 2 dwg
FIELD: measuring equipment engineering.
SUBSTANCE: holding system for measuring device for controlling and/or determining level of environment in reservoir, containing at least one body (13) and at least one elongated block (1). In accordance to invention, body (13) of device includes at least one incision ring (4), which is cut into external layer of elongated block (1) oriented from end process with possible connection of elongated block (1) to body (13) of device electrically, with resistance to compression and stretching.
EFFECT: creation of holding system, by means of which holding block may be fastened on or in a body of device.
8 cl, 3 dwg