CN2043348U

CN2043348U - Surveying instrument for liquid level

Info

Publication number: CN2043348U
Application number: CN 88207358
Authority: CN
Inventors: 王一平
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-06-23
Filing date: 1988-06-23
Publication date: 1989-08-23

Abstract

The surveying instrument for liquid level of the utility model is a high accuracy instrument for surveying liquid level. With the elimination of the method of indirect measuring the liquid level adopted by present dipper stick, the utility model avoids the disturbance of the fluctuant liquid level and the future trouble of the water-finding paste, overcoming the essential disadvantage existing in prior art, wherein, the liquid in vehicle tank smoothly flow into a liquid level tube through a control valve, and the indication on a scale and a vernier can be read after the liquid is taken out from the liquid level tube. The surveying instrument for liquid level is a surveying instrument which can directly survey liquid level. The utility model has the advantages of simple structure, low cost and convenient operation, being suitable for surveying liquid level in various environment.

Description

Surveying instrument for liquid level

The utility model relates to the level gauging instrument of liquid measure in the measured automobiles jar.

At present the fluid level measuring instrument of liquid measure has two kinds in the measured automobiles jar: a kind ofly be called special-purpose T-square, another kind is called depth measurement steel tape (being commonly called as ullage rule); The standard of its dip stick is referring to national metrological verification regulations JJG133-87 and oil and liquid form product tank car handing-over metrological regulation SY102-83.Special-purpose T-square is to be made of one one a meter long Steel Ruler (scale is arranged) and a cross bar, the depth measurement steel tape is to be made of a coil band (scale is arranged) and a weight, above-mentioned any dip stick all is to utilize liquid to stick in vestige on the dip stick, measure and definite liquid level position, in order to make vestige clear, estimate that earlier desire is surveyed automobile jar liquid level, highly be coated with the water-finding paste of last layer pinkiness accordingly at dip stick, water-finding paste pulverize white under the immersed in liquid level, the separatrix of two kinds of colors is liquid level, at first, because dip stick contacts with liquid level, evoke the impact ripple easily, beat easily, inevitably the measuring error that also exists the liquid level ripple to cause although put down gently; Secondly, the water-finding paste that is coated in the dip stick surface can not be avoided capillarity; The 3rd, owing to behind the empty wagons canned liquid, move behind the car weight heart, the automobile jar tilts easily to produce the level gauging error, and the 4th, the minimum division value of scale is 1 millimeter on the dip stick, its reading error is 0.5 millimeter.

From above-mentioned two kinds of dip sticks, be not difficult to find out have following four aspect factors to produce measuring error: the first, liquid fluctuating, actual measurement is 2 millimeters, the second, and the capillarity of water-finding paste, actual measurement is 0.5 millimeter, the 3rd, behind the automobile dress liquid, the car jar tilts forward and back (by 30 ' calculating), actual measurement is 0.027 millimeter, the 4th, the rod reading error, actual measurement is 0.5 millimeter; Its accumulation root-mean-square error reaches 2.1 millimeters unexpectedly, for capacity at the 4500 car jars that rise between 10000 liters, it is appreciable causing the liquid measure mistake, a kind of capacity just commonly used is that 6500 liters car jar is an example, 2.1 the mistake of the suitable 19 liters of liquid measures of millimeter liquid level error, this is the numeral that can not ignore.

In view of this, the utility model all is the method that adopts a kind of indirect measuring liquid level at above-mentioned existing dip stick, exist the disadvantage of essence, so measuring accuracy is difficult to improve, therefore a kind of fluid level measuring instrument of direct measuring liquid level is provided, this fluid level measuring instrument is to be based upon existing dip stick is made on the basis of macromethod, no matter all making brand-new design on the measuring principle or on the structure.At first, the liquid level tube of fluid level measuring instrument inserts in the automobile jar, operation valve is opened, allowed the car pot liquid slowly flow to liquid level tube, allow the enlarged-diameter of liquid level tube simultaneously to the size that capillarity do not occur, to keep liquid level tube to equate with liquid level in the car jar, the second, by closed control valve, the liquid level tube of holding liquid is taken out from the car jar, direct measuring liquid level, thereby avoided the interference of liquid fluctuating and the future trouble of water-finding paste, the 3rd, making edge of a knife shape as the location-plate of measuring basis, all the time be in gravity direction to reach liquid level tube, as the instruments of inspection, reduced the error that the car jar tilts to bring, the 4th with air level, additional vernier reading improves reading accuracy.

Fluid level measuring instrument of the present utility model comprises: scale 4 is characterized in that: liquid level tube 7, vernier 5, operation valve 6, operating rod 1, two location-plates 3, and air level 2 constitutes.

In addition, in two location-plates 3 of fluid level measuring instrument of the present utility model, one side as the location all make edge of a knife shape, two edges of a knife are contained on same the straight line symmetrically, and perpendicular to the axis of liquid level tube 7.

Below the accompanying drawing of the utility model exemplary embodiments is set forth:

Fig. 1 is the structural representation of fluid level measuring instrument of the present utility model.

Fig. 2 is the location-plate outside drawing of fluid level measuring instrument of the present utility model.

Elaborate exemplary embodiments of the present utility model with reference to Fig. 1, Fig. 2:

By clockwise rotating operating rod 1, operation valve 6 is opened, then liquid level tube 7 is inserted in the car jar 8, until allowing two location-plates 3 contact with car jar jar mouth, the liquid of car jar 8 slowly enters liquid level tube 7 simultaneously, liquid level equates in the liquid level of liquid level tube 7 and the car jar 8, the bubble of observing with the air level 2 of location-plate 3 upright positions mediates, represent that the axis of liquid level tube 7 is in gravity direction this moment, so inhour is rotated operating rod 1, and operation valve 6 is closed, the liquid level tube 7 that fills liquid is taken out in car jar 8, fluid level measuring instrument is hung, and the axis of liquid level tube 7 is in gravity direction, reads numerical value from vernier 5 and scale 4, the numerical value of reading is meant that liquid level converses the liquid level of car jar 8 then to the difference in height of car jar jar mouth in the car jar 8.

The architectural characteristic of the main parts size of the foregoing description is described below:

Liquid level tube 7 is to be made by glass, and in order to prevent capillarity, the radius of liquid level tube 7 calculates according to R=(2 δ)/(ρ gh) formula to be determined.

Wherein: δ---the coefficient of tension (72.8).

ρ---fluid density (＜1).

G---acceleration of gravity (980 dyne/seconds ²).

H---capillary height (0.01 millimeter).

R---liquid level tube radius.

Go out 14.8 millimeters of R ≈ by above-mentioned data computation, present embodiment is got the R=20 millimeter.

Scale 4 is to be made by metal circular tube, leaves four long windows by the girth five equilibrium, so that observe the liquid level in the liquid level tube 7, scale 4 minimum division values are 1 millimeter scale, has slidably vernier 5,0.02 millimeter of vernier 5 minimum scale value on the cylindrical of scale 4; The cooperation reading accuracy of scale 4 and vernier 5 can reach 0.01 millimeter, and scale 4 can also play the protective effect to liquid level tube 7 simultaneously.

On the operation valve 6 transverse holes is arranged, and the vertical hole of the transverse holes of intercommunication is all the time arranged on the operating rod 1, when clockwise rotating operating rod 1 transverse holes on it is communicated with transverse holes on the operation valve 6, be that operation valve 6 is in open mode, oil in the car jar 8 flows into liquid level tube 7, inhour is rotated operating rod 1 misplaces transverse holes and the transverse holes on the operation valve 6 on it, and promptly operation valve 6 is closed.

Two location-plates 7 are contained in and scale 4 fixing putting versatilely, can fold to make easy to carryly, and the edge of a knife that can guarantee two location-plates 7 again is on same straight line, and perpendicular to the axis of liquid level tube 7.

From the experiment of present embodiment, influence the level gauging error and have only two aspect factors: the first, 0.01 millimeter of vernier 5 reading error, the second, the composition error 1.3 * 10 that the air level and the edge of a knife tilt ^-7Millimeter; The accumulation root-mean-square error of its actual measurement has only 0.01 millimeter.Obviously, the measuring accuracy of fluid level measuring instrument of the present utility model is much higher than the measuring accuracy of the dip stick of prior art, can deserve to be called the high-precision liquid level measurer device, for 4500 measurements that rise to the car jar liquid level of 10000 liters of capacity, has great economic valency matter, in addition, this fluid level measuring instrument is simple in structure, cheap, easy to use, is suitable for carrying out under the various environment level gauging.

Claims

1, fluid level measuring instrument of the present utility model comprises: scale 4, it is characterized in that: operating rod 1 is arranged topmost at this measuring instrument, and the operation valve 6 below the connection scale 4, liquid level tube 7 is arranged in scale 4 and outside vernier 5 is arranged, two location-plates 3, air level 2 are housed above the scale 4 are vertically fixed on two location-plates 3 on the plane.

2, be characterised in that according to the described fluid level measuring instrument of claim 1: in two location-plates, one side as the location all make edge of a knife shape, two edges of a knife are contained on same the straight line symmetrically, and perpendicular to the axis of liquid level tube 7.