CN2459715Y

CN2459715Y - Counter reading out device for flow meter

Info

Publication number: CN2459715Y
Application number: CN 01214923
Authority: CN
Inventors: 周力尤; 王立亚; 陈培钧
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-15
Filing date: 2001-01-15
Publication date: 2001-11-14
Anticipated expiration: 2011-01-15

Abstract

The utility model discloses a counter reading out device for flow meters, which comprises a count word wheel, a light-transmitting piece with grey gradation, and a photoelectric sensor, wherein, the light-transmitting piece is fixedly stuck on the surface of the count word wheel; the grey gradation of the light-transmitting piece and reading numbers pointed by the count word wheel are one-to-one corresponding; the grey gradation signals of the light-transmitting piece, which are one-to-one corresponding to the reading numbers of the count word wheel are read by the photoelectric sensor, and are transmitted to a circuit for processing. The utility model does not synchronously count with a mechanical count word wheel, and therefore, the counter reading out device is not required to continuously work for a long term and only is electrified to work and directly read out the reading numbers pointed by the mechanical count word wheel when reading meters; the stability and the reliability of remote transmission systems are enhanced.

Description

A kind of counting reading device of flowmeter

The utility model relates to a kind of counting reading device, especially relates to a kind of device of counting on the mechanical counter water, electricity, gas flowmeter that is used to read.

Usually, the structure of remote transmission formula water, electricity, gas table is to place magnet steel or reflectance coating on some gears of table, when rotating, triggers by gear tongue tube (Hall element) or optoelectronic switch action, the moving circle of revolution produces a pulse signal, far-end computer must continuously receive these pulse signals, counts, thereby is converted into the flow of water, electricity, gas, this process can not be interrupted in 6～8 years in the lifetime of table, otherwise can cause the asynchronous of electronics and mechanical reading.Therefore, adopt this structure just to require system stability very high, the necessary steady and continuous work of system, and require power supply to be interrupted.System or power supply occur being interrupted or fault will cause the reading of far-end electronical reading and mechanical movement inconsistent, and just far-end is inaccurate by the water, electricity, gas amount that electric signal is converted into.

The purpose of this utility model is to provide a kind of counting reading device of flowmeter, and this device need not to count synchronously with mechanical counter, only when regular statistic flow, just makes electronic unit work also accurately read counting on the table.

For achieving the above object, the utility model comprises the counting character wheel, it is characterized in that: also comprise light transmission piece and photoelectric sensor with gray shade scale, light transmission piece is attached to the surface of counting character wheel admittedly, and the gray shade scale of this light transmission piece is corresponding one by one with counting character wheel indication reading, and read and character wheel reading light transmission piece gray shade scale signal one to one by photoelectric sensor, be transferred to circuit and handle.

The utility model is provided with the fill-in light electric transducer, and this fill-in light electric transducer and photoelectric sensor are placed side by side within the radian of a five equilibrium, is used for reading the grey scale signal of maximum gray scale 90% to minimal gray 0% critical conditions.

Circuit described in the utility model is made up of single-chip microcomputer and multi-way switch, the signal that photoelectric sensor reads is transferred to single-chip microcomputer through multi-way switch, the signal that the fill-in light electric transducer reads directly is transferred to single-chip microcomputer, and two groups of signals can show concrete reading on the flowmeter in terminal after single-chip microcomputer is handled.

Photoelectric sensor described in the utility model is the projection-type photoelectrical coupler.

Light transmission piece described in the utility model is divided into ten and waits classification, gray scale successively from 0% to 90%.

The utility model compared with prior art, have following advantage: the reading of (1) water, electricity, gas table only relies on former mechanical character wheel counting and keeps, data be counted and be preserved to electronic unit need not synchronously with mechanical character wheel, so do not need long-term continuous working, only when checking meter reading, just power up the reading that the mechanical character wheel indication is directly read in work, increased substantially the stability and the reliability of distance transmission system; (2) with contactless Photoelectric Detection count signal, can not produce mechanical wear; (3) solved the problem that reads by the most black intermediateness to transparent position, guarantee reading accurately.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 the utility model is the structural representation of an embodiment wherein;

Fig. 2 is a side view embodiment illustrated in fig. 1;

Fig. 3 is a structural representation of setting up the fill-in light electric transducer embodiment illustrated in fig. 1;

Fig. 4 is signal processing circuit figure of the present utility model.

As Fig. 1, shown in 2, on counting character wheel 1 surface of flowmeter, paste a circular transparent film 2 admittedly, this transparent film 2 radius ratios counting character wheel 1 is big slightly, transparent film is divided into ten five equilibriums, every part light transmission has nothing in common with each other, deceive from bright the changing to entirely of full impregnated, gray scale successively from 0% to 90%, a projection-type photoelectrical coupler S1 is set, the Infrared that photoelectrical coupler is penetrated from transmitting terminal 3 penetrates the receiving end 4 of film projection light electric coupler, transparent film 2 rotates with the counting character wheel, the transparency difference of transparent film on different positions, thereby make the photoelectrical coupler receiving end obtain different voltage (stream) value, reflect the position that counting character wheel 1 is forwarded to, i.e. reading on the flowmeter.

Quantitatively illustrate for example below: adjust circuit parameter, making the film gray scale is 0% o'clock, and the photoelectrical coupler output voltage is 0V; The film gray scale is 10% o'clock, and the photoelectrical coupler output voltage is 1V; The rest may be inferred.Relation between film gray scale and the photoelectrical coupler output voltage has three kinds of situations: the first, and when photoelectrical coupler transmitting terminal light only penetrated a certain gray shade scale (as 10%), the photoelectrical coupler output voltage values was exactly the reading of character wheel; Second, two gray shade scales of photoelectrical coupler transmitting terminal light penetration, as between 0% and 10% when (except 90% and 0%), the photoelectrical coupler output voltage is the value between two voltages of these two gray shade scale correspondences, when photoelectrical coupler was in the intersection of film from 0% gray scale to 10% gray scale, photoelectrical coupler was an a certain numerical value between the 0-1V because of the variation of gray scale makes its magnitude of voltage that passes through, but as long as its value＜1, then should think 0V, judge that the character wheel reading is 0; The 3rd, when photoelectrical coupler transmitting terminal light penetration the most black between the most transparent gray shade scale 90% and 0% time, a critical conditions can appear in the photoelectrical coupler output voltage values, this moment, magnitude of voltage might be from being up to any minimum value, be any one value (not containing 9V and 0V) in the 9-0V scope, can cause difficulty identification.In order to address this problem, this device adds a fill-in light electric coupler S2 side by side on photoelectrical coupler S1 side, and the overall dimensions that makes two photoelectrical couplers is spent the arc length (as shown in Figure 3) at angles less than transparent film one lattice 36, like this when photoelectrical coupler S1 is in critical conditions, be between the 9-0V during any numerical value, auxiliary photoelectricity closes device S2 and still is in the most black 90% grayscale position, judges with this and assert that its output voltage should be 9V, judges that the character wheel reading is 9; When the fill-in light electric coupler is in the most black 90% grayscale position, and photoelectrical coupler is when arriving the most transparent 0% gray scale, and fill-in light electric coupler output voltage is 9V, and the photoelectrical coupler output voltage is 0V, judges that the character wheel reading is 0.

In sum, the character wheel position can be according to following rule judgment: fill-in light electric coupler output voltage is not 9V, and then the character wheel reading equals the value of rounding of photoelectrical coupler output voltage; Fill-in light electric coupler output voltage is 9V, and the photoelectrical coupler output voltage is not that 9V is not 0V yet, and then the character wheel reading equals 9; Fill-in light electric coupler output voltage is 9V, and the photoelectrical coupler output voltage is 9V, and then the character wheel reading equals 9; Fill-in light electric coupler output voltage is 9V, and the photoelectrical coupler output voltage is 0V, and then the character wheel reading equals 0.

Above-mentioned is the counting reading device of counting on the character wheel at, as a plurality of counting character wheels are arranged on the flowmeter, can on each counting character wheel this counting reading device be installed all accordingly.

Two groups of signals that photoelectric sensor and fill-in light electric transducer read are transferred to circuit and handle, and physical circuit only shows the photoelectrical coupler and the connection of fill-in light electric coupler circuit of a character wheel, the output V of photoelectrical coupler as shown in Figure 4 among the figure ₀₂Receiving model respectively is pin IN1, IN2 and the IN3 of 4051 multi-way switch U2, the output V of fill-in light electric coupler ₀₁Receiving model is pin AN1, AN2 and the AN3 of PIC16C73 single-chip microcomputer U1, two groups of signals are after single-chip microcomputer U1 handles, can realize the telecommunication of data, and the concrete reading on terminal demonstration flowmeter, for the counting that reads on the water, electricity, gas flowmeter provides convenience.

Claims

1, a kind of counting reading device of flowmeter, comprise counting character wheel (1), it is characterized in that: also comprise light transmission piece (2) and photoelectric sensor (S1) with gray shade scale, light transmission piece (2) is attached to the surface of counting character wheel (1) admittedly, and the gray shade scale of this light transmission piece is corresponding one by one with counting character wheel indication reading, and read and character wheel reading light transmission piece gray shade scale signal one to one by photoelectric sensor (S1), be transferred to circuit and handle.

2, the counting reading device of flowmeter according to claim 1, it is characterized in that: be provided with fill-in light electric transducer (S2), this fill-in light electric transducer (S2) is placed side by side within the radian of a gray scale five equilibrium with photoelectric sensor (S1), is used for reading the grey scale signal of maximum gray scale 90% to minimal gray 0% critical conditions.

3, the counting reading device of flowmeter according to claim 1, it is characterized in that: described circuit is made up of single-chip microcomputer (U1) and multi-way switch (U2), the signal that photoelectric sensor (S1) reads is transferred to single-chip microcomputer (U1) through multi-way switch (U2), the signal that fill-in light electric transducer (S2) reads directly is transferred to single-chip microcomputer (U1), and two groups of signals can show concrete reading on the flowmeter in terminal after single-chip microcomputer is handled.

4, the counting reading device of flowmeter according to claim 1 and 2 is characterized in that: described photoelectric sensor (S1, S2) is the projection-type photoelectrical coupler.

5, the counting reading device of flowmeter according to claim 1 is characterized in that: described light transmission piece (2) is divided into ten and waits classification, gray scale successively from 0% to 90%.