CN1058648A - Volumetric scraper flowmeter - Google Patents

Abstract

A kind of volumetric scraper flowmeter is particularly suitable for measuring existing of product oil storage field light-end products.This flowmeter is made up of conducting element (A), flow sensor (B), pulse signal generator (C), intelligent flow display (D) four parts.Its outstanding feature is a housing inner chamber shape and curve has the optimization mathematical model, and advanced meanses such as available computers and numerically-controlled machine accurately design and Precision Machining.In addition, pulse signal generator (C) is a self-locking type Hall sender unit, can accurately calculate by output pulse signal, adds that intelligent flow display (D) has cummulative metering, single metering, instantaneous delivery calculating, four functions of step-by-step counting can realize on-the-spot tolerance adjustment and precision correction.Have advantages such as precision height, motion is steady, noise is little.

Description

Volumetric scraper flowmeter

The present invention is a kind of volumetric scraper flowmeter, particularly the improvement of shell inner cavity shape face sum counter.

Existing volumetric scraper flowmeter mostly is made up of conducting element, flow sensor, mechanical transmission mechanism and mechanical counter four major parts.

Its housing inner-cavity structure has two types, and a kind of is that housing inner chamber shape surface curve is round; Another kind is non-circle.For the housing inner chamber shape surface curve of a kind of structure in back, at present, still there is not definite universal expression form, therefore, for the design and the processing of this class shape face, difficulty is bigger, and the pattern design all is difficult to guarantee with crudy.Because, can not guarantee the continuity of housing inner chamber shape surface curve, thereby influence robust motion.And be unfavorable for producing in serial form to this series products.In addition, this series products tolerance adjustment is to realize by the way that changes gear ratio, and what have also is provided with different auxiliary adjusting devices, therefore, assembles and adjust cumbersome, adjust at the scene and its accuracy of instrument of verification, and is just more difficult.

The purpose of this invention is to provide a kind of its housing inner chamber shape surface curve and have the optimization mathematical model, advanced means such as available computers and numerically-controlled machine accurately designs and Precision Machining, can effectively guarantee robust motion and reliability, and be provided with the high precision volumetric scraper flowmeter that can on-the-spot carry out the counting display device of tolerance adjustment and precision correction.

Technical scheme of the present invention is: this flowmeter is made up of conducting element, flow sensor, pulse signal generator, intelligent flow display four parts.The housing inner chamber curved surface of flow sensor by two concentrics but the different face of cylinder of radius and the curved surface of two special geometric shapes form, wherein, and the face of cylinder of cylindrical rotor is concentric and radius is identical for the roundlet cylinder of inner chamber, the great circle cylinder of inner chamber and rotor cylinder surface and two scraper plate sides and two ends capping form the constant volume chamber, with the cylindrical rotor center of circle (also being the center of circle of housing inner chamber roundlet cylinder) is initial point, with the vertical axis of symmetry of housing is Y-axis, set up plane coordinates system, the function expression of housing inner chamber shape surface curve is:

γ＝R ₀（0≤θ≤90°- (φ)/2 -α ₁）……（1）

γ＝R ₀+K ₁〔θ-（90- (φ)/2 -α ₁）〕 ²

（90°- (φ)/2 -α ₁≤θ≤90°-α）……（2）

γ＝R-K ₂〔（90+ (φ)/2 -α ₂）-θ〕 ²

（90°-α≤θ≤90°+ (φ)/2 -α）……（3）

γ＝R （90+ (φ)/2 -α ₂≤θ≤180）……（4）

Wherein:

α ₁＝Sin ^-1(b)/(2Ro)

α ₂＝Sin ^-1(b)/(2R)

$a=\tan -1\frac{b}{\sqrt{{\mathrm{Ro}}^2-{\left(\frac{b}{2}\right)}^2}+\sqrt{R^2-{\left(\frac{b}{2}\right)}^2}}$

In the formula, R ₀Be rotor radius, R be constant volume chamber shell wall to distance of shaft centers from, b is a scraper thickness, φ is the cornerite of two special geometric shape surface curves, its value is advisable at 70 °-90 °.R ₀, all the flowmeter according to different size is given for R, b.Model specification one timing, R ₀, R, b, φ be respectively to fixed number.

By kinematics and kinetic theory analysis, by making prototype test and verification, housing inner chamber shape surface curve satisfies the volumetric scraper flowmeter that above-mentioned mathematical function is expressed formula, can satisfy following specific (special) requirements.

1. housing inner chamber shape surface curve is level and smooth, and at boundary position, its tangent line is continuous;

2. in any position, every pair of scraper plate equates with inner cavity surface contact point distance, to guarantee that motion steadily;

3. housing inner chamber Symmetric Y axle distributes, and the fluidised form that enters the fluid zone of transition before and after the constant volume chamber behind the housing inner chamber is consistent, and strengthens robust motion.

In addition, pulse sender unit of the present invention is a self-locking type Hall sender unit, and its structure designs according to the principle of work of self-locking type hall device.One can be provided with the induction disk that armature spindle rotates synchronously and divides equally the even number magnetic core that a certain radius is the γ circumference, these magnetic core polarity S and N alternately arrange, one sending disk that remains static is arranged, the γ place is provided with hall probe in the distance center of circle, induction disk and sending disk card are parallel to each other, both centers of circle are in same axis, and the induction disk can be made circular motion with respect to sending disk.When it was worked, its output signal was in two on off states of locking voluntarily.Promptly the operating distance that enters hall probe when the S utmost point is exported high level, and high level is in case appearance is just extremely irrelevant with S.Have only when the N utmost point enters the operating distance of hall probe, low level just occurs, in like manner, in case low level is just extremely irrelevant with N after occurring.Like this, sender unit just can not influence its output reliability because of microvibration changes its output waveform state, guarantees the accuracy of counting.

Intelligent flow display of the present invention is to be the data processing equipment of main body circuit with the singlechip chip, and aforementioned sender unit pulse signal is input into this device.It is provided with instrument coefficient preset key, function change-over switch, reset key, LCD.The function change-over switch is a fourth gear bit switch, directly links to each other with single-chip microcomputer, is respectively cummulative metering, single metering, step-by-step counting, instantaneous delivery calculating shelves.The supervisory routine of this device adopts assembly language, is solidificated among the EPRON, as the function change-over switch is placed the step-by-step counting gear, just can carry out on-the-spot tolerance adjustment, reaches the correction of accuracy of instrument, to guarantee the high precision of metering.

Thereby realized purpose of the present invention.

Specific structural details of the present invention is provided by accompanying drawing.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the a-a sectional view of Fig. 1;

Fig. 3 is a housing inner chamber shape surface curve synoptic diagram;

Fig. 4 is the structural representation of pulse signal generator (C);

Fig. 5 is that the E of Fig. 4 is to view.

Shown in accompanying drawing 1,2, (A) be conducting element, (B) be flow sensor, (C) be pulse signal generator, (D) be intelligent flow display.Flow sensor is made up of housing (1), cylindrical rotor (2), scraper plate (3), spring (4), connecting rod (5), four uniform groovings are arranged on the circumference of described cylindrical rotor, and pilot hole is arranged with the grooving radial communication, by connecting rod (5) that places pilot hole and can in this hole, slide and the spring (4) that is loaded on the connecting rod top scraper plate (3) is loaded in the grooving, and keeps scraper plate to contact with the housing inner cavity surface.1.-4. the shape surface curve (6) of described housing inner chamber satisfies the aforementioned functions expression formula, and is symmetrical in Y-axis.Accompanying drawing 3 has provided the shape of this shape surface curve.θ be (90 °-(φ)/2-α ₁), (90 °-α), (90 °+(φ)/2-α ₂) (270 °-(φ)/2+α ₂), (270 °+α), (270 °+(φ)/2+α) locate to be respectively flex point.Shown in accompanying drawing 1, be in the great circle cylinder of R the time as the radius that two scraper plates are in the housing inner chamber simultaneously, this great circle cylindrical inner wall and rotor (2) cylindrical wall and two scraper plate sides, the close room of envelope that the two ends capping forms just is constant volume chamber (7).Conducting element of the present utility model (A) also can be as a whole with housing (1).

Accompanying drawing 4,5 has provided an embodiment of pulse signal sender unit of the present invention (C).It is made up of induction disk (9), price fixing (10), sending disk (11) three parts.Induction disk (9) is placed in the price fixing (10), can rotate synchronously with armature spindle, and sending disk is fixed on the price fixing (10), and sending disk (11) is parallel to each other with induction disk (9) card.Both centers of circle are in same axis.Radius at induction disk (9) is on the circumference of γ the even number through hole of dividing equally circumference to be arranged, can be 2,4,6,8,10,12,14,16,18,20, magnetic core (16) is housed in each through hole, its magnetic pole S and N alternately arrange, 2 through holes are arranged on the same diameter on the sending disk (11), its centre distance core is γ, and hall probe (12), (13) are housed in it, and has three-core shielding line (14), (15) to draw respectively.(14) line is transported to intelligent flow display (0), (15) as teletransmission.Described hall probe is that the chip in the semiconductor devices is required assembling and is connected to schmidt shaping circuit according to hall theory.Three-core shielding line one core is a power lead, and a core is an output line, and another core is a ground wire.In addition, this pulse signal sender unit is provided with the relative mutual interlocking gear when static with sending disk of induction disk, promptly as shown in Figure 5, two through holes are arranged on another diameter perpendicular to aforementioned two hall probe place diameters, its centre distance core is γ also, and soft iron core (17), (18) are housed respectively in it.

As shown in Figure 1, 2.Intelligent flow display of the present invention (D) is loaded on the conducting element (A), and it is one is the data processing and the display device of main body circuit with the singlechip chip.Be provided with instrument coefficient preset key (19), fourth gear bit function change-over switch (20) on its panel, be respectively cummulative metering, single metering, step-by-step counting, instantaneous delivery calculate four gears, reset key (21), LCD (22).

The course of work of the present invention is: fluid is after the inlet of conducting element (A) enters the inner chamber of housing (1), drive scraper plate, the rotation of drive rotor, thereby the fluid that enters in the housing inner chamber is discharged from the endpiece of conducting element (A), rotor whenever circles, and just has the fluid of four times of constant volume chamber volumes to discharge.Meanwhile, induction disk (9) rotates in company with armature spindle (8), magnetic core on it (16) will insweptly successively be in the sending disk (11) of stationary state and go up set hall probe (12), (13) and soft iron core (17), (18), shielding line (14), (15) the output heart yearn will be exported a series of pulse square wave in, because two hall probes are on the same diameter of posting a letter on coiling, and the magnetic core number is an even number, circumference and N are divided equally in its distribution, the S utmost point is alternately arranged, so the magnetic core polarity that two probes run at synchronization is identical, the signal that receives and export is also identical.This two paths of signals all has self-locking action, and does not disturb mutually, and one the tunnel transports to intelligent flow display shows as the scene, and another road is as teletransmission or make his usefulness, as transports to central control room (CCR).

Dg50 volumetric scraper flowmeter constructed in accordance (its housing inner chamber shape surface curve pattern designs with the Designer-V-X computing machine, and processes with numerically-controlled machine) is better than 0.2 grade through measuring accuracy on probation, and noise is little, and motion is steadily reliable.

Claims (8)

1, a kind of volumetric scraper flowmeter, by conducting element (A), flow sensor (B), pulse signal generator (C), intelligent flow display (D) four parts are formed, described flow sensor B comprises housing (1), cylindrical rotor (2), scraper plate (3), spring (4), connecting rod (5), the face of cylinder that the inner chamber curved surface that the invention is characterized in described housing (1) is not waited by two radiuses and the curved surface of two special geometric shapes are formed, form the roundlet cylinder of inner chamber curved surface and the face of cylinder of rotor (2), concentric and radius equates, great circle cylinder and rotor cylinder surface, two scraper plate sides and two ends capping constitute the constant volume chamber, whole shape surface curve (6) is with the Y-axis symmetry, and its function expression is:

γ=R ₀(0≤O≤90°- (Φ)/2 -α1)……(1)

γ=R ₀+K ₁[θ-(90- (Φ)/2 -α1)] ²

(90°- (Φ)/2 -α1≤θ≤90°-α)……(2)

γ=R-K ₂[(90+ (Φ)/2 -α2)-θ] ²

(90°-α≤θ≤90°+ (Φ)/2 -α)……(3)

γ=R (90+ (Φ)/2 -α2≤θ≤180)……(4)

Wherein:

α1=Sin ^-1(b)/(2Ro)

α2=Sin ^-1(b)/(2R)

$a=\tan -1\frac{b}{\sqrt{{\mathrm{Ro}}^2-{\left(\frac{b}{2}\right)}^2}+\sqrt{R^2-{\left(\frac{b}{2}\right)}^2}}$

Ro is identical with rotor radius, R be constant volume chamber shell wall to distance of shaft centers from, b is a scraper thickness, their value is determined according to the different size model.

2, volumetric scraper flowmeter according to claim 1 is characterized in that aforesaid φ value is 70 °-90 °.

3, volumetric scraper flowmeter according to claim 2 is characterized in that aforesaid conducting element A and housing (1) can be an integral body.

4, according to claim 1,2,3 described volumetric scraper flowmeters, it is characterized in that described pulse signal generator is a self-locking type Hall sender unit, it is by induction disk (9), price fixing (10), sending disk (11) is formed, induction disk (9) is placed in the price fixing (10), sending disk (11) is fixed on the price fixing (10), and sending disk (11) is parallel to each other with induction disk (9) card, its center of circle is in same axis, radius at induction disk (9) is on the circumference of γ the even number through hole of dividing equally circumference to be arranged, magnetic core (16) is housed in each through hole, its magnetic pole S and N alternately arrange, upward have through hole at sending disk (11), hall probe is housed in it apart from core γ place.

5, volumetric scraper flowmeter according to claim 4, it is characterized in that 2 through holes are arranged on the same diameter on the sending disk (11), its centre distance core is γ, hall probe (12), (13) are housed in it, and there are three-core shielding line (14), (15) to draw respectively, three-core shielding line (14) is transported to display instrument D, and three-core shielding line (15) is as teletransmission.

6, volumetric scraper flowmeter according to claim 5, it is characterized in that upward on another diameter perpendicular to aforementioned two hall probes (12), (13) place diameter two through holes being arranged at sending disk (11), its centre distance core is γ, and through hole is equipped with soft iron core (17), (18).

7, volumetric scraper flowmeter according to claim 6, it is characterized in that responding to even number through hole on the disk (9) can be 2,4,6,8,10,12,14,16,18,, 20.

8, volumetric scraper flowmeter according to claim 7, it is characterized in that described intelligent flow display (0) is is the data processing equipment of main body circuit with the singlechip chip, this device is provided with instrument coefficient preset key (19), function change-over switch (20), reset key (21), LCD (22), above-mentioned function change-over switch (20) links to each other with single-chip microcomputer, it is a fourth gear bit switch, is respectively cummulative metering, single metering, step-by-step counting, instantaneous delivery calculating device shelves.

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