CN200941063Y

CN200941063Y - Magnetostrictive level probe

Info

Publication number: CN200941063Y
Application number: CN 200620031180
Authority: CN
Inventors: 李大顺; 于青杰; 王德东
Original assignee: ZHENGZHOU WINDBELL ELECTRIC CO Ltd
Current assignee: ZHENGZHOU WINDBELL ELECTRIC CO Ltd
Priority date: 2006-08-23
Filing date: 2006-08-23
Publication date: 2007-08-29
Anticipated expiration: 2016-08-23

Abstract

A magnetostriction liquid level probe is characterized in that the probe comprises a testing rod (6), an electronic storehouse behind the testing rod (10), liquid level floats (9) and interface floats (8) attached with magnetic material rings and assembled sequentially on the testing rod,. Inside the testing rod (6), waveguide wires and a temperature sensor are arranged, the waveguide wires being used for conversion between electric energy and mechanical energy. An electronic measurement sensor is arranged in the electronic storehouse (10). With the characteristics of high precision, good repeatability, simply installation, non-contact measurement and strong environmental adaptability, the utility model can be applied to multi-liquid level measurements and is designed based on the requirements for intrinsic safety and explosionproof, and can be widely applied to oil, chemical, hydroelectric, pharmaceutical, food, and beverage industries, measuring the liquid level of various liquid storage tanks.

Description

The magnetostrictive liquid level probe

Technical field

The utility model relates to a kind of equipment in the liquid level measuring system, relates to a kind of magnetostrictive liquid level probe specifically.

Background technology

Fewer and feweri along with non-renewable resources, the growing to even greater heights of oil price, the accurate measurement of oil product becomes more and more important.Oil product is along with variation of temperature can expand or shrink, and oil product also can evaporate or be stolen, and the fuel charger of sale usefulness also needs regularly to edit, and is accurate to guarantee it.Along with the reinforcement of people's environmental consciousness, people are to the leakage of underground oil tank oil product or overflow the environmental pollution that causes and more and more pay attention to.All of these factors taken together makes that all following the tracks of oil mass accurately with the hand chi becomes very difficult.Will follow the tracks of the loss of oil product and oil product accurately, unique feasible way is exactly by advancing, sell, deposit management continuously accurately, and at this moment, the High Accuracy Liquid Level Measuring System with the function of leaking hunting has just become optimal selection.

Most of Major Oil Company are implementing the plan of unmanned refuelling station.Refueling in the unmanned refuelling station is self-action, and collecting money also is automatically, and the oil product supply is by Liquid level probe the mode that the oil level information automatic remote sends to be controlled.The whole day 24 HOUR ACCESS of this refuelling station does not but have the staff, has made things convenient for the client, provides cost savings.Unmanned gasoline station also will be China National Petroleum Corporation's selection in future.

A lot of refuelling stations are all administered by present most of oiling company, the refuelling station of company distributes and disperses, for a long time, interchange between each station is less relatively, and there is not fixing sales region to divide and unified sales tactics, therefore in start business, be in the state of fighting separately substantially, be difficult to produce bigger scale effect; Company exists information channel not smooth always simultaneously, and data transmission lags behind, and customer management capability is hanged down inferior problem.It is a great problem that information transmits always, by accuracy and the real-time that modes such as phone, fax again can't guarantee information transmit, use have the liquid level measuring system of network transmission function after, solved this problem well.Oil station also can obtain fast by general headquarters provide as oil products delivery, oil product appraise at the current rate, a series of service content such as sales promotion policy; The managerial personnel of general headquarters can recognize oil tank level information and each full and accurate record and the relevant statistics of refueling accurately that the subordinate refuelling station is real-time by system, grasp the business development situation at oil station, thereby make things convenient for real-time monitoring and the oil product most optimum distribution of resources of managerial personnel oil station sales process; Effectively reduce hand labor intensity, save operation cost, improve the service quality and the market competitiveness of oil company.And Liquid level probe is as one of core component of liquid level measuring system, and its high precision, high stability, high reliability have won application more and more widely.At present, it progressively obtains promoting in industries such as petrochemical complex, food, pharmacy, machineries, and is special more strong in the demand of petrochemical industry.

Summary of the invention

The purpose of this utility model is just providing a kind of magnetostrictive liquid level probe that is used for liquid level measuring system.This Liquid level probe have install simple, reliability is high, the characteristics of stable performance, can be directly installed in the flow container, liquid level in the jar is monitored in real time.

The purpose of this utility model can adopt following measure to realize:

Magnetostrictive liquid level probe of the present utility model comprises the electronics storehouse of surveying the excellent body of rod, being positioned at the excellent body of rod of survey rear portion, be sleeved on liquid surface float that has the magnetic material ring and the interface float surveyed on the excellent body of rod successively, survey be equipped with in the excellent body of rod be used to carry out electricity/function conversion by waveguide filament and temperature sensor, electronics is equipped with electronic survey sensor in the storehouse.

Electronic survey sensor described in the utility model comprises exciting circuit I, sensor circuit II, sample circuit III, temperature measurement circuit IV, measuring amount output circuit V, single-chip microcomputer VI, power circuit VII; Wherein the input end of exciting circuit I connects the corresponding output end of single-chip microcomputer VI, the input end of the output termination sample circuit III of sensor circuit II, the output terminal of sample circuit III inserts the respective input of single-chip microcomputer VI, temperature measurement circuit IV data port is connected with the data port of single-chip microcomputer VI, the input end of measuring amount output circuit V connects the corresponding output end of single-chip microcomputer VI, and the driving pulse of the generation of exciting circuit I is delivered to the input end of sensor circuit II after waveguide filament carries out electricity/function conversion.

The model of single-chip microcomputer VI is C8051F350 in the electronic survey sensor of the present utility model, the model of the integrated operational amplifier of sample circuit III is AD8042, the model of the temperature sensor of temperature measurement circuit IV is DS1820B20, the model of the communication chip that the digital communication output of described measuring amount output circuit V is adopted is MAX485, the model of the analog-digital chip that the output of analog current ring is adopted is DAC8531, and the model of integrated operational amplifier is TLC27L2.

The survey rod body of rod in the utility model is made by non-magnetic stainless-steel tube, produce a driving pulse by the circuit in the electronics storehouse during work, this driving pulse is in transmitting along waveguide filament, produce a rotating magnetic field of advancing along the waveguide filament direction, when the permanent-magnetic field in this magnetic field and the ball float (non-contacting ball float is provided with magnet ring in it) meets, produce magnetostrictive effect, make waveguide filament that the machinery twisting take place, and this machinery twisting ripple transmit along the waveguide filament direction according to certain speed.When this machinery twisting is delivered in the electronics storehouse, be translated into corresponding electric impulse signal by sensor circuit II and sample circuit III.Calculate mistiming between driving pulse and the float inductive impulse by single-chip microcomputer VI, just can calculate tested displacement and liquid level accurately.Send measurement data to upper receiver by measuring amount output circuit V at last.

The utility model can be applied in many liquid level gaugings occasion, and it requires design according to explosion-proof design of essence safety, and has precision height, good reproducibility, easy for installation, non-contact measurement, the characteristics that environmental suitability is strong.It can be widely used in industries such as oil, chemical industry, water power, pharmacy, food, beverage, to the level gauge of various flow containers.

Description of drawings

Fig. 1 is a structural drawing of the present utility model.

Among the figure: 1 be power lead (blue line), 2 for RS485A (brown), 3 for RS485B (yellow), 4 for power supply ground (black), 5 for cable sealed joint, 6 for survey the excellent body of rod, 7 for the protection block, 8 for the interface float, 9 for liquid surface float, 10 be the electronics warehouse.

Fig. 2 is a theory diagram of the present utility model.

Fig. 3,4,5 is circuit theory diagrams of the present utility model.

Embodiment

The utility model is further described below with reference to embodiment (accompanying drawing):

Magnetostrictive liquid level probe of the present utility model comprises the electronics storehouse 10 of surveying the excellent body of rod 6, being positioned at the excellent body of rod of survey rear portion, be sleeved on liquid surface float that has the magnetic material ring 9 and the interface float 8 surveyed on the excellent body of rod successively, survey be equipped with in the excellent body of rod be used to carry out electricity/function conversion by waveguide filament and temperature sensor, electronics is equipped with electronic survey sensor in the storehouse; Described electronic survey sensor comprises exciting circuit I, sensor circuit II, sample circuit III, temperature measurement circuit IV, measuring amount output circuit V, single-chip microcomputer VI, power circuit VII; Wherein the input end of exciting circuit I connects the corresponding output end of single-chip microcomputer VI, the input end of the output termination sample circuit III of sensor circuit II, the output terminal of sample circuit III inserts the respective input of single-chip microcomputer VI, temperature measurement circuit IV data port is connected with the data port of single-chip microcomputer VI, the input end of measuring amount output circuit V connects the corresponding output end of single-chip microcomputer VI, and the driving pulse of the generation of exciting circuit I is delivered to the input end of sensor circuit II after waveguide filament carries out electricity/function conversion.

This novel physical circuit principle of work is as follows:

That the single-chip microcomputer VI that adopts in the electronic survey sensor of the present utility model is the C8051F350 that U.S. SiliconLaboratories produces, and it has 8K FALSH, 768RAM, inner 4 16 TIMER, 16 PCA, enhancement mode UART and SPI.Its system clock is chosen as 48MHz.The effect of exciting circuit I is that the low-voltage multiplication of voltage is arrived high voltage to give the enough exciting currents of waveguide filament.When wanting the height of measuring liquid level, single-chip microcomputer is periodically controlled the transmission exciting current by the IO pin of oneself.Exciting current flows along the waveguide filament direction, when the rotating magnetic field of generation runs into permanent-magnetic field in the ball float, produces magnetostrictive effect, makes waveguide filament that the machinery twisting take place.When the twisting of the machinery of waveguide filament is delivered to the electronics storehouse, sensor circuit II converts the twisting of this machinery the pulse of to corresponding millivolt level induced voltage, sample circuit III amplifies this pulse then, and the digital square-wave pulse that final generation can be recognized by single-chip microcomputer is amplified in filtering again.The inner high precision TIMER of single-chip microcomputer dependence writes down the mistiming between driving pulse and float inductive impulse.Single-chip microcomputer by digital filtering algorithm, calculates tested displacement and liquid level according to the time difference of repeatedly sampling then.Distribute in the body of rod 5 temperature sensors (DS18B20) have been installed, the signal pins of this sensor links to each other with the IO pin of single-chip microcomputer, carries out the mutual of data according to one-line communications protocol and single-chip microcomputer.Single-chip microcomputer is called data command according to agreement down to temperature sensor, and temperature sensor is uploaded to single-chip microcomputer according to agreement with the temperature value that records.Single-chip microcomputer calculates the measured value of each temperature sensor by digital filtering algorithm.Data such as level value that obtains and temperature value are by measuring amount output circuit V output.The way of output has two kinds: the digital communication mode is exported, and utilizes the number bus mode to export.Analog quantity (4-20mA electric current loop) mode is exported.

Claims

1, a kind of magnetostrictive liquid level probe, it is characterized in that: it comprises the electronics storehouse (10) of surveying the excellent body of rod (6), being positioned at the excellent body of rod of survey rear portion, be sleeved on liquid surface float that has the magnetic material ring (9) and the interface float (8) surveyed on the excellent body of rod successively, survey waveguide filament and the temperature sensor that is used to carry out electricity/function conversion is housed in the excellent body of rod (6), electronic survey sensor is equipped with in (10) in the electronics storehouse.

2, magnetostrictive liquid level probe according to claim 1 is characterized in that: described electronic survey sensor comprises exciting circuit I, sensor circuit II, sample circuit III, temperature measurement circuit IV, measuring amount output circuit V, single-chip microcomputer VI, power circuit VII; Wherein the input end of exciting circuit I connects the corresponding output end of single-chip microcomputer VI, the input end of the output termination sample circuit III of sensor circuit II, the output terminal of sample circuit III inserts the respective input of single-chip microcomputer VI, temperature measurement circuit IV data port is connected with the data port of single-chip microcomputer VI, the input end of measuring amount output circuit V connects the corresponding output end of single-chip microcomputer VI, and the driving pulse of the generation of exciting circuit I is delivered to the input end of sensor circuit II after waveguide filament carries out electricity/function conversion.

3, magnetostrictive liquid level probe according to claim 2, it is characterized in that: the model of single-chip microcomputer VI is C8051F350, the model of the integrated operational amplifier of sample circuit III is AD8042, the model of the temperature sensor of temperature measurement circuit IV is DS1820B20, the model of the communication chip that the digital communication output of described measuring amount output circuit V is adopted is MAX485, the model of the analog-digital chip that the output of analog current ring is adopted is DAC8531, and the model of integrated operational amplifier is TLC27L2.