CN2108909U

CN2108909U - Float type liquid level gauge

Info

Publication number: CN2108909U
Application number: CN 91228144
Authority: CN
Inventors: 王嘉贤
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-11-05
Filing date: 1991-11-05
Publication date: 1992-07-01

Abstract

The utility model relates to a float type liquid level gauge for the measurement of the liquid level, comprising a float, a silk, a rope or a belt, a balancer, a runner, a data processing and display system, an angle transmitter with 360 DEG and a line displacement transmitter driven by a lead screw. The line displacement transmitter acquires the displacement region of the float and then determines the displacement quantity of the float together with the angle transmitter. The originating mode of the electromagnetic induction is used to eliminate the liquid seal or the magnetic coupling mechanism desired in some occasion. A magnetic energy machine is used to replace the balancer, and a zeroing mechanism is designed by means of the eddy effect. The utility model has the advantages of wide range of application, large measuring range, high precision, reliable use, simple structure and low cost.

Description

Float type liquid level gauge

The utility model relates to the float type level gauge of level gauging.

The disclosed float type level gauge of prior art such as CN86107944A, its float and evener couple together with the tube line and place on the pulley, during liquid level change, float is lifting thereupon, by the moving pulley rotation of tube tape, the swing arm of pulley belt electrokinetic potential device slides on potentiometer, predicts the treated display system of its divider resistance and converses level value and show.This kind liquid level gauge structure is simpler, but following deficiency is still arranged: precision is lower, and range is less, and the scope of application is narrower.

Shanghai Automation Meter Factory No. 4, the Beijing Fourth Automation Instrument Factory, Dalian the 5th instrucment and meter plant, the float type level gauge that U.S. VAREC company produces, principle of work and mode are the same.When being used for the higher occasion of precision, its transmitter has adopted a plurality of multidigit Combined Cycle sign indicating number code-discs, for the consideration of factors such as isolating with measured medium or anticorrosion, explosion-proof, has all adopted fluid-tight or magnetic coupling mechanism to realize isolating.This kind liquid level gauge is directly perceived, and be easy to connect, but adopt a plurality of multidigit code-discs with computing machine, the cost height, post a letter element and signal wire are many, and structure is complicated, manufacturing and maintenance difficult and influence reliability.Adopt in addition and pull out the tooth carry, for eliminating ambiguity error, treatment circuit complexity.For reducing signal transmssion line, the on-the-spot complicated translation operation treatment circuit of installing that needs.Some occasions need be coupled accurately, the magnetic coupling structure that makes trouble.When adopting fluid-tight, only can be used for the occasion near normal pressure, also exist fluid-tight medium vaporization at high temperature, low temperature freezes; Produce chemical reaction or problems such as physical action and easy pollution measured medium with measured medium.When being used to have densification to close container applications, be limited to the element of posting a letter and be the mounting means facing to the code-disc axial end, even adopt the electromagnetic induction mode of posting a letter, its isolation structure brings problems such as complete machine manufacturing process complexity, cost height, volume are big.

The purpose of this utility model is to overcome the deficiencies in the prior art, provides that range is big, precision is high, is easy to the float type level gauge of manufacture, installation, maintenance.

It is wide that another purpose of the present utility model provides the scope of application, can satisfy such as explosive-proof grade to require height, the airtight float type level gauge that the liquid level instrumentation of multiple harsh occasions such as pressure is arranged.

It is can satisfy request for utilization equally in magnetic coupling or fluid-tight mechanism that some unnecessary occasions elimination people adopt that the utility model also has a purpose.

An extra purpose of the present utility model provides novel school zero-sum balanced controls.

The utility model is achieved in that it comprises that float, runner, two ends connect the silk of runner and float, rope or belt respectively, evener, processes and displays system and the displacement of the lines transmitter that is connected by leading screw such as multiturn potentiometer or this class of differential transformer and runner, it is characterized in that: one 360 ° angle transmitter is housed again on the runner coaxially, and linking to each other with the displacement of the lines transmitter by co-axially fixed leading screw again on the angle transmitter constitutes fluid level transmitter jointly.Transmitter links to each other with the processes and displays system by signal wire, it is not to adopt the combination code-disc by the gear carry of making a leapleap forward, mode principle work with check code, the angle that neither lean on thick essence to make up--digital quantizer leans on carry and logic error correction line work, but determine the zone of angular displacement of 360 ° angle transmitter roughly by the displacement of the lines transmitter, on 360 ° planimetric coordinates, drop on this regional physical location again the zero point of the angle transmitter by 360 ° and draw the accurate angular displacement that is directly proportional with the liquid level change amount.

Its principle of work is: during liquid level change, the angle transmitter that the acting in conjunction of float and evener makes runner drive 360 ° rotates synchronously, and drives the displacement of the lines transmitter synchronously by leading screw and axially move.The variable quantity of the angular displacement of angle transmitter and displacement of the lines transmitter and proportional with the straight line lifting amount of float.Its data handling procedure is: by displacement of the lines transmitter measuring and calculating know the angle transmitter turn over 360 ° * n+ φ ± * (n=0,1,2,3 ...), φ is an angle value, x is the numerical value that the error of factors generations such as various machineries, electrical equipment, driving-chain is converted to corner.For avoiding occurring diadic, guarantee 360 ° the angle transmitter zero point position, the angle monodrome on 360 ° planimetric coordinates drop in the zone that φ-x～φ+x determined, should guarantee to make the x value less than 180 °, on coordinate, drop on the angle beta of this regional position the zero point of reading the angle transmitter with respect to the φ angle, the sense of rotation of angle transmitter is for just when rising with liquid level, another direction is for negative, then accurately angular displacement is 360 ° * n+ φ+β, this angular displacement and liquid level change amount are proportional, convert its variable quantity to electric signal and transport to the processes and displays system, this angular displacement is converted to handle promptly gets actual liquid level.

360 ° of angle transmitters of the present utility model can be rotary transformers, it can be the Weight and disk type angle transmitter of reflected code, it can also be rotary how fast inductosyn, it can also be rotary capacitor, rotational potentiometer, the mode of posting a letter of its reflected code code-disc can be a code-disc that touches of contact, can be the post a letter Weight and disk type transmitter of mode of contactless photoelectricity or electromagnetic induction.

Angle transmitter of the present utility model can also be following structure: disk of coaxial installation on the runner, magnet steel of insert on the circumference of disk, run the pass element jointly facing to circumferentially whole uniform non-contactly several tongue tubes of circle of disk or magnetic, make the element of posting a letter, its delivering method has adopted with people now to be known and widely used magnetic float liquidlevel meter, identical, be that magnet steel goes to diverse location and switches and different resistance values, converse the position, angle of magnet steel thus, promptly draw the corner of disk on 360 ° of coordinates.At this moment, if post a letter when element is more may to cause error big, can be divided into plurality of sections along orientation with putting in order the uniform element of posting a letter of circle, every section to be connected to respectively on the signal wire with above-mentioned mode, and signal is transported in the processes and displays system.This transmitter has reduced signal wire, makes circuit simple, is easy for isolating occasion.Displacement of the lines transmitter of the present utility model can also adopt how fast formula linear inductosyn except that can adopting multiturn potentiometer or differential transformer, the slide carriage and the leading screw of inductosyn slide rule join.In addition, can also take on slide carriage, to make the mode of concavo-convex circulation code channel, lay magnetic reading head facing to concavo-convex code channel of permeability magnetic material.

Usually, when isolation method is posted a letter, preferably adopt the electromagnetic induction mode of posting a letter, insulated chamber non-magnet material manufacturing, as use 1Cr18Ni9Ti, make detect and machinery become send part with insulated chamber that container communicates in, post a letter element outside insulated chamber.At this moment, the angle transmitter preferably adopts the electromagnetism code-disc of reflected code or aforesaid by the magnet steel on disk, the disk, the angle transmitter that the element of posting a letter that disk is circumferentially uniform constitutes, and the displacement of the lines transmitter can adopt differential transformer, also can adopt on the slide carriage and produce concavo-convex reflected code, face toward reflected code is laid magnetic reading head outside insulated chamber structure with permeability magnetic material.When insulated chamber thickness was big, above-mentioned two kinds of transmitters and posting a letter between the element can be installed the magnetic conductive rod that passes insulated chamber.This structure is suitable for having densification to close container and explosion-proof occasion especially, has eliminated the undesirable magnetic coupling of people mechanism.Code-disc, the insulated chamber manufacture craft is simple.The utility model, manufacturing for the angle transmitter of simplifying insert magnet steel structure, such electromagnetism code-disc also is provided: the disk circumference upper edge sense of rotation of a ferrimagnet is made concavo-convex reflected code, one utmost point of a magnet steel links to each other facing to the center line of this disk, the corresponding element of posting a letter is a tongue tube, magnetic is run the pass jointly, a kind of in Hall or the magneto sensor, and the element of posting a letter links to each other with the processes and displays system by signal wire.

For ease of teletransmission, reduce cable count, save and install and maintenance cost, simplify on-the-spot circuit part, can be near transmitter place installing multichannel automatic transfer switch on signal wire, switch the electric weight that each transmitter successively respectively and reach in the processes and displays system, also can establish electrical transformation devices change electrical quantitys such as V/I, V/F at this place and be beneficial to teletransmission through having believed line.More than both look application scenario or device and determine whether to be provided with one of them or all installings.After installing above-mentioned device, the signal of which road transmitter that identification signal is come can be realized with following mode: several transmitters can be designed to different electric weight perform regions, work in 1-3V as the angle transmitter, and the displacement of the lines transmitter is worked in 5-7V.In addition, also can utilize length difference switching time of each transmitter to come discernible signal from which transmitter by main frame.Before can also utilizing the signal switching of each transmitter, switch earlier and a zero signal, switch successively thereafter and the signal that comes reaches main frame from different transmitters one by one, do starting point with zero signal by main frame, determine which transmitter that each signal thereafter comes, according to this circulation.The frequency signal that is in the different operating zone that can utilize the V/F device that each transmitter is changed out in addition reaches main frame by two signal wires, carries out spectrum analysis by main frame the frequency parameter of each transmitter is separated for analytical calculation.

Adopt the utility model, in order to reduce volume, improve sensitivity or be range extension, can also set up an input shaft between runner and angle transmitter links to each other with runner shaft, output shaft and the coaxial variator that links to each other of angle transmitter, use speed reduction unit during for range extension, use speed-increasing gear during for raising sensitivity.

Evener of the present utility model can be a counterbalance weight, can be the constant force clockwork spring, can also adopt magnetic-energy machine to realize, the structure of magnetic-energy machine and principle be existing detailed introduction in the instructions of the disclosed magnetic-energy machine of CN86107148A.The rotor coaxial of magnetic-energy machine is connected on the runner shaft, makes it to constitute turning moment and float and constitute balance the gravitational torque direction of runner is opposite with stator.For reducing fluctuation and, can between magnetic-energy machine and runner shaft, add an input shaft and link to each other the speed reduction unit that output shaft links to each other with runner shaft with the magnetic-energy machine armature spindle the requirement of magnetic-energy machine turning moment size.Soft-shelled turtle with balance bob when this kind balanced controls can be avoided adopting long constant force clockwork spring or wide range is held.

The utility model also provides the following device that is used for school zero, it is to utilize the eddy effect of electromagnetism to realize like this, promptly on runner shaft, adorn the disk of a ferrimagnet coaxially, the two poles of the earth of u shape magnet steel are installed and close disk facing to the non-contacting symmetry of disk, the center symmetry of u shape magnet steel is packed on the machine shaft of installing with the runner coaxial cable, when u shape magnet steel produces the relative motion that eddy current magnetism hinders magnet steel and disk with the motor rotating circular disk, make disk produce turning moment, the moment acting in conjunction that school zero can be by this moment and evener is carried float that preposition carries out above the container.Also can make float proportion greater than test solution proportion, the moment acting in opposition by this eddy effect with float below the heavy as container preposition carry out.The moment of eddy effect should guarantee that unlikely silk, rope or belt that will connect float break.When adopting mode school that float sinks to zero, should make that eddy effect produces to the moment of runner less than the moment of evener to runner, and the moment that makes eddy effect is greater than making float sink the moment required as liquid.School zero process is: when motor turns to transmitter output no change, draw the deviate of the given relatively checksum location of float, this deviate is compensated, revises in the processes and displays system or be can eliminate through processing of circuit given zero point with deviate.School zero can manually be carried out, and also can be carried out automatically by disposal system.

Be to reduce requirement, can between ferrimagnet disk and runner, an input shaft be set and be connected the speed reduction unit that output shaft links to each other with runner shaft with disc shaft eddy effect power size.Have and press to isolate occasion when using, separated by insulated chamber between the disk of motor and continuous u shape magnet steel thereof and ferrimagnet.Some occasion is owing to liquid fluctuation or impact float or other factors can cause silk on the runner or the lax turmoil of rope to influence using the time, can take on the silk, rope at float with float apart a determining deviation refill a pouring weight.Make silk, rope fluctuate phenomenon such as jumps up and down at float when producing, the gravity of pouring weight still can guarantee silk, restricting receives certain pulling force and unlikely lax turmoil.

Because gas conduction is bad, for improving the scope of application, can between the flange above insulated chamber and the container, add heat insulation sealing gasket, offer on the pad do not influence thread, aperture that rope or belt passes through, with reduce gas in insulated chamber to flow, this heat insulating mattress can play block simultaneously.

The utlity model has following characteristics: 1, range is big, the precision height, and cost is low, the reliability height.This is to send structure and the low transmitter of price because the utility model has adopted the element of posting a letter of making every effort to few to become with simple machinery, but and used high precision, wide range ground diagonal displacement becomes the displacement of the lines transmitter that send.Make precision only depend on the angle transmitter simultaneously, encoding amount or precision that the expansion of range also can increase runner diameter and angle transmitter realize easily.2, the scope of application is wide, this is because the utility model had both been considered wide range, high-precision realization, considered to have densification to close the reliable use in container or place such as explosion-proof again, also considered to utilize pouring weight to eliminate influence and the restriction of hydraulic shock fluctuation, and made insulated chamber simple in structure using.3, fluid-tight that some occasions adopted or magnetic coupling mechanism have been eliminated.4, provide balance novel, easy to implement and school zero mechanism, 4, provide when avoiding adopting very long constant force clockwork spring or being used for balance bob, need a kind of structure that substitutes with magnetic-energy machine with very long rail silk mechanism.5, pouring weight being set above the float has overcome some occasion liquid fluctuation, has impacted influence and restriction to using.6, signal wire is few, and data processing method is simple, makes data handling system simple relatively, and complete machine is easy to make and safeguard.

The explanation of accompanying drawing and drawing:

Fig. 1 is that of the utility model float type level gauge implements illustration.

Fig. 2 is the structural representation of a kind of angle transmitter of the utility model float type level gauge.

Fig. 3 is that schematic diagram is sent in the change of the utility model float type level gauge angle transmitter shown in Figure 2.

Fig. 4 is another enforcement illustration of the utility model float type level gauge.

Fig. 5 is the processes and displays system chart of the utility model float type level gauge.

With reference to Fig. 1, it mainly comprises float (1), silk, rope or belt (3), runner (4), counterbalance weight (13), leading screw (9), the displacement of the lines transmitter (10) that leading screw drives, signal wire (11) and processes and displays system (12), also be coaxially connected with 360 ° angle transmitter (8) on it with runner, leading screw (9) one ends and coaxial connection of angle transmitter (8), the screw rod position of screw mandrel (9) connects with approach screw with displacement of the lines transmitter (10), and displacement of the lines transmitter (10) axially moves with the rotation of leading screw (9).In the present embodiment, between the axle of 360 ° angle transmitter (8) and runner (4), can establish an input shaft and coaxial linking to each other of runner (4), output shaft and the coaxial variator that links to each other of angle transmitter (7), the silk in the time of can also adding a pouring weight (2) at the certain position of float (1) top silk, rope and prevent that fluid to be measured (14) fluctuation is big on the issuable runner (3), phenomenon that rope (3) is chaotic.Range should not adopt constant force clockwork spring or counterbalance weight (13) when making balanced controls greatly, the rotor coaxial of runner (4) with magnetic-energy machine (5) can be connected, rely on the moment of magnetic-energy machine (5) to substitute other balanced controls, can also between magnetic-energy machine (5) and runner (4), increase an input shaft and link to each other output shaft and the coaxial speed reduction unit that links to each other of runner (4) (6) with magnetic-energy machine (5) rotor.In the present embodiment, angle transmitter (8) is rotary inductosyn preferably.

Fig. 2 and shown in Figure 3 be a kind of angle transmitter.(8-1) is disk among the figure, a magnet steel (8-2) insert is on the circumference of disk (8-1), the element (8-3) of posting a letter is run the pass jointly for tongue tube or magnetic, circumferentially uniform along disk near magnet steel (8-2), and be associated with on two leads (8-5), wherein be connected to resistance (8-4) between the element of posting a letter in twos (8-3) on the lead (8-5).

Shown in Figure 4 is the another enforcement illustration of the utility model, increased among this embodiment and communicated with container (20) and at the insulated chamber (19) of container (20) upper fixed, test section and machinery change send part in insulated chamber (19), angle transmitter and displacement of the lines transmitter have all adopted the aforesaid electromagnetic induction mode of posting a letter, the corresponding element of posting a letter (8-3) and (10-1) in the outside of insulated chamber (19), passing insulated chamber (19) send mechanism and posts a letter between the element in change, fixedly magnetic conductive rod (15) is beneficial to post a letter.Among the figure, disk of ferrimagnet (16) and u type magnet steel (17) and motor (18) have constituted school zero mechanism.(6) be speed reduction unit, (21) are heat insulating mattress, have aperture (22) on the heat insulating mattress.In the present embodiment, angle transmitter (8) preferably adopts aforesaid disk (8-1), magnet steel (8-2), the element (8-3) of posting a letter, lead (8-5), the structure that resistance (8-4) provides or the electromagnetism code-disc of reflected code, displacement transducer (10) preferably adopts differential transformer.

Claims

1, a kind of float type level gauge, comprise float (1), runner (4), two ends connect silk, rope or belt (3) of runner (4) and float (1) respectively, displacement of the lines transmitter (10) and data processing display system (12) that evener and runner (4) drive by leading screw (9), it is characterized in that: be fixed with one 360 ° angle transmitter (8) between the leading screw (7) on runner (4) and the displacement of the lines transmitter (10) coaxially, the signal wire (11) of transmitter (8) links to each other with processes and displays system (12).

2, float type level gauge according to claim 1, it is characterized in that said angle transmitter (8) is: one with the coaxial disk that is connected of runner (4) (8-1), be installed with magnet steel (8-2) on disk (8-1) circumference, circumferentially run pass (8-3) jointly facing to non-contacting uniform the circle tongue tube or the magnetic that are connected in parallel on the lead (8-5) of magnet steel (8-2) along disk (8-1), tongue tube or magnetic close on the lead (8-5) of switch room and are connected to resistance (8-4) in twos.

3, float type level gauge according to claim 1, it is characterized in that container (20) top is provided with the insulated chamber (19) that communicates with container, angle transmitter (8) and displacement of the lines transmitter (10) adopt the electromagnetic induction mode of posting a letter, the corresponding element of posting a letter (8-3) and (10-1) in the outside of insulated chamber (19), insulated chamber is the non-magnetic material.

4, float type level gauge according to claim 3, it is characterized in that said angle transmitter (8) is the electromagnetism code-disc or the said angle transmitter of claim 2 of reflected code, its feature is that also said displacement of the lines transmitter (10) is a differential transformer.

5, according to claim 2 or 4 described float type level gauges, it is characterized in that a uniform lead (8-5) that encloses element (8-3) place of posting a letter is divided into plurality of sections along orientation, every section is passed through signal wire (11) and links to each other with processes and displays system (12).

6, float type level gauge according to claim 1, it is characterized in that said angle transmitter (8) is a rotary transformer, rotary capacitor, rotational potentiometer, many fast inductosyns, a kind of in the reflected code code-disc, said displacement of the lines transmitter (10) is to be composed of concavo-convex reflected code on the slide carriage that drives of the linear inductosyn that links to each other with leading screw (9) of the slide carriage of differential transformer or multiturn potentiometer or slide rule or leading screw (9), lays magnetic reading head facing to concavo-convex code channel.

7, float type level gauge according to claim 1 is characterized in that signal wire (11) is gone up close transmitter (8) and (10) are located automatic transfer switch can be set.

8, float type level gauge according to claim 1 is characterized in that signal wire (11) is gone up close transmitter (8) and (10) are located the switching device that V/I or V/F etc. are beneficial to the signal is far passed can be set.

9, float type level gauge according to claim 7 is characterized in that can installing the switching device that V/I or V/F etc. are beneficial to the signal is far passed behind the automatic transfer switch.

10, float type level gauge according to claim 1 is characterized in that said balanced controls are magnetic-energy machine (5), the rotor of magnetic-energy machine (5) and coaxial connection of runner (4).

11, float type level gauge according to claim 1, it is characterized in that also being equipped with coaxially on the runner (4) disk (16) of ferrimagnet, the two poles of the earth of u shape magnet steel (17) symmetry is near disk (16), and be fixed on symmetrically with the coaxial motor of laying of runner (4) (18) spool on.

12, float type level gauge according to claim 3 is characterized in that being provided with heat insulating mattress (21) between the flange of insulated chamber (19) and container (20) top, has aperture (22) on the heat insulating mattress (21).