CN2161910Y

CN2161910Y - Optical code liquid level indicator

Info

Publication number: CN2161910Y
Application number: CN 93222804
Authority: CN
Inventors: 王文瑞; 王拥军; 李瑞英; 张兆盛
Original assignee: 王文瑞
Priority date: 1993-08-25
Filing date: 1993-08-25
Publication date: 1994-04-13
Anticipated expiration: 2003-08-25

Abstract

The utility model discloses a measuring instrument device which measures the inner liquid level of a liquid storing tank. A float is connected with a steel belt, and rises and falls along a guide steel wire with the change of the liquid level, which makes the steel belt move around the pulley. Thus, the driving wheel is driven to rotate. The driving wheel and an optical code disc are coaxial and rotate coaxially, so the change of the rise and fall height of the float is converted into the change of the rotation angle of the optical code disc. Then, an optical code signal detected by a fiber sampling device is delivered to a detection circuit to be processed, and the converted pulsing signal is transferred to a secondary instrument to be processed. In addition, the utility model can also be used with a computer network. The distance measured by the measuring instrument device can reach 30 meters. The utility model can automatically compensate the measurement error caused by the weight unbalance of the steel belt on both sides of the float and the balance weight.

Description

Optical code liquid level indicator

The utility model relates to a kind of apparatus, particularly relates to a kind of liquid level instrument apparatus that is used to measure the inner liquid level of receiver.

In oil, chemical industry, metallurgy, electric power and national defense industry, there is the liquid level of a large amount of receivers or oil depot to measure, general float type level gauge as shown in Figure 2, mainly form by steel band I and fluid level transmitter II two parts, one of steel band 2 is connected with float 1, and the other end is connected with constant force spring device 15 through pulley 4, sprocket wheel 13, sprocket wheel 13 and integrator 14 and the coaxial rotation of fluid level transmitter II, by secondary instrument 11 result is handled, its shortcoming is that cogwheel gearing is arranged, so mechanism's complexity, measuring accuracy is low.

Application number is a 90203708(90.12.12 bulletin, and notification number is CN2067400) name is called " float-type sign indicating number band liquid level gauge " and discloses a kind of like this liquid level gauge, and it is main, and to survey element be a stainless steel optical code band, its length equates with the height of survey receiver, its moving conduit, and an end leads to basin, one end leads to atmosphere, therefore, the steam and the atmosphere of optical code band contact basin medium, condensate, dust etc., the sign indicating number band so make dirty, it is inaccurate that light is detected, and error code occurs.

It is the open day 1991.2.6 of 90202242.3(that name is called " float-type code wheel liquid level gauge " application number, publication number CN2070900) Chinese patent, it is that optical code is existed on the code-disc wheel, the installation site of code wheel directly is not communicated with basin, atmosphere, the possibility of the light sign indicating numbers of making dirty such as medium steam, dust is greatly reduced, but in the device of this patent, include machinery conversion mechanism and intermittent drive mechanisms such as gear pair, so the degree of accuracy that structure is still complicated, influence is measured.

Defective at above-mentioned existence, the purpose of this utility model is to provide a kind of like this photoconduction code-disc liquid level instrument apparatus, it replaces the instrument function that physical construction is finished by electronic circuit, thereby improved the stability of device, it simple in structure has only two driven pulleies, gearless machine, the transmission resistance is little, the measuring accuracy height.

For achieving the above object, the utility model has been taked following technical measures, float is connected with steel band and along the lifting of guiding steel wire steel band is moved with the variation of liquid level around pulley, thereby driving driving wheel rotates, described driving wheel is connected with optical code wheel is coaxial, make both coaxial rotation, the height change of float lifting is transformed into the corner variation of optical code wheel, the optical code wheel end face is marked with reflected code, detect the bright dipping coded signal by the sampling by optical fiber device and deliver to testing circuit is handled and will be transformed into pulse signal and be transported to secondary instrument and go to handle, also can with computer networking.

The major advantage of this liquid level instrument apparatus is:

1, replaces the instrument function that physical construction is finished by electronic circuit, thereby improved the performance and the stability of instrument.

2, simple in structure, have only two driven pulleies, gearless machinery, the transmission resistance is little, the measuring accuracy height.

3, with a code-disc, be aided with processing of circuit, then can survey and highly reach 30 meters, and " float-type code wheel liquid level gauge " is the fluid value that just can measure 30 meters height with the measure that increases code wheel quantity with interior level value.

The utility model is described in further detail below in conjunction with accompanying drawing

Fig. 1 is the utility model photoconduction code-disc liquid level instrument apparatus.

Fig. 2 is a prior art float-type sign indicating number band liquid level gauge.

As shown in the figure, one end of steel band 2 is connected with float 1, and edge guiding steel wire 3 liftings with liquid level change, and the other end is by the pulley 4 of support steel Tape movement, driving wheel 5 is connected with counterweight 6, described driving wheel 5 is coaxial with optical code wheel 8, change so that both coaxial rotation are transformed into the corner that end face is marked with the optical code wheel 8 of reflected code with the height of float 1 lifting, the sampling by optical fiber device 9 of being located at optical code wheel 8 places is delivered to detected smooth coded signal testing circuit and is converted pulse signal at this and transfers to secondary instrument and handle.Secondary instrument is handled the pulse signal of input, can obtain the pairing millimeter of this signal value.

Stress in the circuit of (1) secondary instrument the memory arithmetic element is arranged, the accumulative total that stores optical code wheel 8 is rotated number n, in view of the above, then can measure the liquid level of basin.

If the reflected code numerical value of last input is b, this time detected reflected code numerical value is B, and the code-disc maximum range is k, as (B-b)/K 〉=E.Then to rotate the number of turns be N=n-1 to the optical code wheel accumulative total of this moment,

Level gauging value H '=K(n-1)+B=KN+B.

If (B-b)/K≤-E, N=n+1 then,

H’＝K（n＋1）＋B＝KN＋B。

If-E＜(B-b)/K＜+E, then the number of turns is constant, i.e. N=n, H '=Kn+B=KN+B, wherein the value of E is got 0.6-0.9.

(2) circuit of secondary instrument has compensating unit, when liquid level changes, the steel band length of float side and the steel band length of counterweight side all change thereupon, cause the variation of steel band at both sides gravity, cause the variation of buoyancy, cause float immersion depth in liquid to change, thereby influence measuring accuracy, award automatic compensation with the secondary instrument electronic circuit, make that error is 0 in the gamut scope.

Output signal is sent to display unit, the pass of the level gauging value H ' of output and the true altitude H that shows liquid level be H=H ' (2c/SY),

The steel band weight of C-unit length wherein,

The sectional area of S-float

The severe of liquid in the Y-receiver.

The utility model is only used an optical code wheel 8 detected cyclic code signals, processing through the secondary instrument circuit, can obtain two kinds of information simultaneously, these two kinds of information stacks, determined the actual liquid level height of receiver, like this, make the limited reflected code quantity that optical code wheel exists, energy measurement go out the range value that surpasses its restriction far away.Only just can measure the liquid level of receiver with an optical code wheel.

Driving wheel 5 in the device has self-holding pulley, thus can guarantee that steel band 2 moves the time, rotate synchronously with driving wheel 5, thus the measuring error of avoiding skidding and causing.

Claims

1, a kind of photoconduction code-disc liquid level instrument apparatus, mainly by float, pulley, the steel band parts are formed, it is characterized in that: an end of steel band (2) is connected with float (1), and edge guiding steel wire (3) lifting with liquid level change, and the pulley (4) that the other end moves by supporting steel band (2), driving wheel (5) is connected with counterweight (6), described driving wheel (5) is coaxial to carry out coaxial rotation with optical code wheel (8), the corner that the height of float (1) lifting is transformed into the optical code wheel (8) that end face is marked with reflected code changes, and detected smooth coded signal is delivered to testing circuit and convert thereof into pulse signal and transfer to secondary instrument and handle by being located at sampling by optical fiber device (9) that optical code wheel (8) locates.

2, liquid level instrument apparatus as claimed in claim 1 is characterized in that: float (1), the caused measuring error of counterweight (6) both sides steel band own wt are compensated automatically by testing circuit.

3, liquid level instrument apparatus as claimed in claim 1 is characterized in that: driving wheel (5) has self-holding pulley, so can guarantee that steel band (2) is mobile the time, driving wheel (5) can rotate synchronously, thus the measuring error of avoiding skidding and causing.

4, liquid level instrument apparatus as claimed in claim 1 is characterized in that: the liquid level that only can measure receiver with an optical code wheel (8).