CN1101976A

CN1101976A - Light-sensitive liquid levelmeter

Info

Publication number: CN1101976A
Application number: CN 93119256
Authority: CN
Inventors: 易育宁
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-22
Filing date: 1993-10-22
Publication date: 1995-04-26

Abstract

The light-sensitive liquid levelmeter has a float emitting a horizontal light beam. When the float moves along with liquid level, the light beam illuminates the light-sensitive elements which are vertically arranged at intervals to indicate actual liquid level with high precision (+/- 0.3 cm) and sensitivity. It is suitable for automatic level monitor of liquid at temp. under 90 deg.C.

Description

Light-sensitive liquid levelmeter

The invention discloses a kind of high-precision liquid level automatic display unit, it can be used for fixing or relatively-stationary places of all observation normal temperature liquid levels, and its accuracy of observation can reach ± and 0.3 centimetre.

Existing Chinese patent " photoelectric liquid-levle instrument " (patent No. CN 86 101109) is after utilizing two conducting pulleys on the buoyancy aid to obtain electric energy along two vertical rolling contacts of charged guide rail, make the spotlight on the buoyancy aid obtain to follow the tracks of the light beam of liquid level, the sensing device identification light beam position be made up of the light activated element of uniformly-spaced vertical distribution again shows liquid level by display then.

Because this liquid level instrument exists: the power consumption of (1) spotlight is bigger, and external power supply is transferred to spotlight with two electric guide rails and two conducting pulleys, and is higher to the selection and the strict cost of mounting process of energising guide rail and conducting pulley when therefore making; (2) because of the guide rail of its charged energy and pulley expose with the common space of liquid in, issuable electrostatic induction makes this liquid level instrument be difficult to use in the liquid that observation is inflammable and explosive and corrosivity is stronger.

Task of the present invention provides a kind of precision height, and cost is low, and is stable and reliable for performance, and it is little to take up room, automaticity height, the automatic display control unit of the liquid level that adaptability and antijamming capability are strong.Can be applicable to that the demanding liquid level of various accuracies of observation and measurement standard shows automatically, place such as record, warning, automatic control of liquid and long-distance wireless monitoring.

Task of the present invention is to finish as follows: utilize the power supply, illuminator and the light inlet window that are sealed on the float of following the tracks of liquid level to send the horizontal light beam of following the tracks of liquid level, discern the position of judging light beam by the photo-sensitive cell of uniformly-spaced vertical distribution and logical circuit thereof and display again, thereby the demonstration liquid level, the present invention has simple in structure, easy to use, installation and maintenance are easy, and demonstration, controlling alarm liquid level wait advantage accurately and reliably.

Below in conjunction with accompanying drawing the present invention is described in further detail:

Accompanying drawing is the agent structure synoptic diagram of light-sensitive liquid levelmeter:

Float in the accompanying drawing [1] is gone up sealing and illuminator [3] is housed and supplies its luminous power supply [2], and illuminator [3] is in illuminated chamber [4], and its luminous energy is by outwards level emission of light inlet window [5]; Float [1] shell fixedly is equipped with roller [10], when liquid level change, float [1] is subjected to the restriction of roller [10] and its track [9] upper and lower unsteady, because of float [1] in that to be equilibrated at liquid level under gravity, the buoyancy function (slightly gapped between the surface of contact of roller [10] and track [9], do not contact under the normal condition, if slightly contact during float [1] skew, the friction force of its generation is also very small); So the horizontal light beam that light inlet window [5] is launched can be considered a constant with respect to the height of liquid level, so the position of horizontal light beam is liquid level position accurately after constant is proofreaied and correct; Being radiated at photic zone [6] back by the horizontal light beam of light inlet window [5] emission is injected on the photo-sensitive cell [8] in the sensor by the tiny light penetrating slit [7] on the light shield layer, through signal that photo-sensitive cell [8] is responded to by its terminal serial connection at least two logic functional elements parallel with one another [11] and circuit to sensitization have at least one photo-sensitive cell [8] to distinguish after, select by display [12] that it is upper or the nextly obtain single signal and show the liquid level position.Also this liquid level signal can be converted to the microwave receiving device emission of microwave signal beyond remote distance, show liquid level signal; Also can go up the installing presetting apparatus, set upper and lower limit liquid level warning point arbitrarily at display [12], the signal that when the liquid level important and influential persons exceeds the upper limit or bottom limit level, gives the alarm, and can be used as the action of control signal source triggering liquid level control executing mechanism.

Uniformly-spaced the vertical distance of the photo-sensitive cell of vertical distribution [8] is corresponding on tiny light penetrating slit [7] on the light shield layer and the sensor; The vertical width of the horizontal light beam of being launched by light inlet window [5] should be greater than the vertical spacing of photo-sensitive cell [8], to guarantee having at least a photo-sensitive cell [8] to sense beam signal; Light position horizontal line of setting in the vertical width of light beam and liquid level are a constant difference in height, the vertical distance of the upper edge of this horizontal line position, light position and light beam (display [12] is selected upper) or lower edge (display [12] is selected the next) is half of vertical distance of photo-sensitive cell [8], this half spacing wave beam width can play the effect of " rounding up " with the vertical distance of photo-sensitive cell [8], makes the observational error of light-sensitive liquid levelmeter reduce to the effect that is slightly larger than " half spacing ".

During enforcement, the guiding form of the float described in accompanying drawing [1] is used for the liquid level observation place in the container, then should add one in addition in the liquid level of no container observation place with float [1] and pass device and enclose square casing in it, tetragonal four angles that photic zone on this inner walls and the sensor [6] is surrounded or four edges be as the track [9] of the roller [10] on the float [1], and corresponding four rolling [10] then is near four angles or four edges that spherical or garden column is loaded on the float end face; It is good that illuminator [3] adopts the strong infrared generator of the little luminous penetration power of power consumption, make the capacity of the fixed power source [2] of being sealed in the float [1] be enough in considerable time luminous for illuminator [3], photo-sensitive cell [8] then adopts the infrared receiver of the high face induction of light sensitivity, and logic functional element [11] then adopts crystal diode; 1～the 20MM that is spaced apart of photo-sensitive cell [8] is good, if arrangement position can stagger inadequately and be divided into vertical plurality of rows; The sensor sectional is made, and independent sealing can be electrically connected to each other by sealing insert row and socket by actual needs between each joint.

Claims

1, a kind of by illuminator is housed, the float of roller is the liquid level automatic display unit that euphotic sensor and display constituted with photo-sensitive cell and one side are housed, it is characterized in that: the power supply [2] that is electrically connected with illuminator [3] is housed in the float [1], the light inlet window [5] that light source is provided with through a side is equipped with the light shield layer of tiny light penetrating slit [7] to sensor between photic zone of sensor [6] and the photo-sensitive cell [8];

2, light-sensitive liquid levelmeter according to claim 1 is characterized in that: the upper edge of light inlet window [5] and the difference in height between the lower edge are not less than the spacing of the photo-sensitive cell [8] of uniformly-spaced vertical distribution;

3, light-sensitive liquid levelmeter according to claim 1 and 2, it is characterized in that: light position horizontal line and liquid level that light inlet window [5] is set are a constant difference in height, and the upper edge of this light position horizontal line and light inlet window [5] or the difference in height of lower edge are not more than half of vertical distance of photo-sensitive cell [8];

4, light-sensitive liquid levelmeter according to claim 1 is characterized in that: between the roller of being adorned on the float [1] [10] and the surface of contact of its guide rail [9] tangent and with slightly gapped for good;

5, light-sensitive liquid levelmeter according to claim 1 and 2 is characterized in that: the tiny light penetrating slit [7] on the sensor is corresponding uniformly-spaced vertical distribution with photo-sensitive cell [8], and it is good with 1～20MM at interval.