CN202734886U - Anti-reversal counting device of flow gauge - Google Patents

Abstract

The utility model discloses an anti-reversal counting device of a flow gauge. The anti-reversal counting device of the flow gauge comprises a round magnetic code disc rotating along with liquid flow. A plurality of magnetic steels are arranged evenly on the magnetic code disc along a circle direction. The anti-reversal counting device of the flow gauge is characterized in that a support plate is arranged facing to the magnetic code disc. A first signal transducer and a second signal transducer are arranged on the support plate. The first signal transducer and a probe end of the first signal transducer are arranged facing to a circle enclosed by the plurality of the magnetic steels. The phase difference between the first signal transducer and the second signal transducer is alpha. The phase difference between each two magnetic steels arranged next to each other is beta. Beta is indivisible by alpha. The anti-reversal counting device of the flow gauge has the advantages of being simple in structure by means of that just an additional signal transducer is added to the mechanical structure of the prior flow gauge, being low in upgrading cost due to the fact that algorithm improvement can be achieved on a core-board and improving the degree of accuracy of the device due to the fact that the turn or reverse of the code disc can be judged by the phase difference between the detection signal of the first signal transducer and the detection signal the second signal transducer, and therefore anti-reversal counting is achieved.

Description

Counting assembly is prevented in counter-rotating in the flowmeter

Technical field

The utility model relates to the counting assembly in the flowmeter, specifically, is the anti-counting assembly of counter-rotating in a kind of intelligent flow meter.

Background technology

Along with the development of industrial technology, the degree of industrial automation and industrial intelligent is more and more higher, and the electronic measurement instrument also is used widely.Particularly in oil, petrochemical industry, electric power, traffic, food, medical and health, national defence scientific research and war industry field, usually need the flow of liquid medium is measured, flowmeter then arises at the historic moment.

Existing intelligent flow meter adopts magnetic induction way mostly, at a disk a plurality of magnet steel is set, and the fluxion strap movable magnetic disc rotation of liquid detects the magnetic induction signal by signal transducer, thereby calculates fluid flow.

Its shortcoming is, existing flowmeter has often only adopted a signal transducer, in the disk rotary course, whenever run into a magnet steel and then produce a pulse signal, can't distinguish the sense of rotation of disk, if exist liquid to flow backwards, the disk counter-rotating, counter still can statistic flow, thereby causes counting inaccurate.

The utility model content

In order to address the aforementioned drawbacks, the utility model provides the counter-rotating in a kind of gauging table anti-counting assembly, can judge the sense of rotation of disk, thereby improves the accuracy of detection of gauging table.

For achieving the above object, the technical scheme that the utility model adopts is as follows:

Counting assembly is prevented in counter-rotating in a kind of flowmeter, comprise a circular magnetic code dish that rotates with liquid flow, be distributed with N magnet steel according to even circumferential on this magnetic code dish, its key is: be provided with back up pad over against described magnetic code dish, first signal sensor and secondary signal sensor are installed on this back up pad, the circumference that the probe end face of described first signal sensor and secondary signal sensor forms over against described N magnet steel, phase differential between first signal sensor and the secondary signal sensor is α, phase differential between adjacent two magnet steel is β, the aliquant β of α.

As further describing, the number N=18 of magnet steel, the phase differential between adjacent two magnet steel are β=360 °/N=20 °.

In order to prevent two interference between the signal transducer, described α, β and N satisfy:

N * | α-k * β |=80 ± 0.5 °, wherein coefficient k is positive integer.

As preferably, the phase differential α between first signal sensor and the secondary signal sensor=44.42 °, the number N=18 of magnet steel, the phase difference beta between adjacent two magnet steel=20 °, coefficient k=2.

Remarkable result of the present utility model is: simple in structure, on the physical construction of original gauging table, only need add a signal transducer, all the other work mainly are that the algorithm on core board improves, upgrade cost is low, can judge that by the phase differential of first signal sensor and secondary signal sensor detection signal disk belongs to forward and still reverses, thereby prevent counter-rotating counting, the accuracy that improves equipment.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is cut-open view of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Such as Fig. 1, shown in Figure 2, counting assembly is prevented in counter-rotating in a kind of flowmeter, comprise a circular magnetic code dish 1 that rotates with liquid flow, be distributed with N magnet steel 2 according to even circumferential on this magnetic code dish 1, be provided with back up pad 5 over against described magnetic code dish 1, first signal sensor 3 and secondary signal sensor 4 are installed on this back up pad 5, the circumference that the probe end face of described first signal sensor 3 and secondary signal sensor 4 forms over against a described N magnet steel 2, phase differential between first signal sensor 3 and the secondary signal sensor 4 is α, phase differential between adjacent two magnet steel 2 is β, the aliquant β of α.

Why set the aliquant β of α, to contrast simultaneously two magnet steel 2 for fear of first signal sensor 3 and secondary signal sensor 4, in order to prevent two interference between the signal transducer, as constraint condition, described α, β and N satisfy N * | α-k * β |=80 ± 0.5 °, wherein coefficient k is positive integer.

In the present embodiment, the phase differential α between first signal sensor and the secondary signal sensor=44.42 °, the number N=18 of magnet steel, the phase difference beta between adjacent two magnet steel=20 °, coefficient k=2.

Principle of work of the present utility model is: utilize Hall effect, when signal transducer can produce a pulse signal during over against magnet steel, along with can driving magnetic code dish 1, liquid flow rotates, the rotate a circle liquid of corresponding a certain fixed volume of magnetic code dish 1 flows through flowmeter, determine to flow through the liquid volume of flowmeter by calculating pulse number that signal transducer produces, and the pulse number that the size of flow velocity can produce by signal transducer in the unit of account time be determined.Be provided with first signal sensor 3 and secondary signal sensor 4 among the design, and guarantee under any anglec of rotation, first signal sensor 3 and secondary signal sensor 4 be aligned magnetic steel 2 simultaneously not, so there is a phase differential in the pulse signal that two signal transducers produce, be example according to Fig. 1 state, magnetic code dish 1 is by counterclockwise rotating, because the phase differential between adjacent two magnet steel 2 is 20 °, phase differential between first signal sensor 3 and the secondary signal sensor 4 is 44.42 °, when first signal sensor 3 produces pulse signal, secondary signal sensor 4 is in advance 4.42 ° of arrivals, if magnetic code dish 1 moves in the direction of the clock, when first signal sensor 3 produces pulse signal, secondary signal sensor 4 will be postponed 15.58 ° of arrivals, core board can judge that according to the phase differential of two signal transducer detection signals magnetic code dish 1 belongs to forward and still reverses, and improves by algorithm, can prevent the counter-rotating counting.

Claims (4)

1. the anti-counting assembly of the counter-rotating in the flowmeter, comprise a circular magnetic code dish (1) that rotates with liquid flow, this magnetic code dish (1) is upper to be distributed with N magnet steel (2) according to even circumferential, it is characterized in that: be provided with back up pad (5) over against described magnetic code dish (1), first signal sensor (3) and secondary signal sensor (4) are installed on this back up pad (5), the circumference that the probe end face of described first signal sensor (3) and secondary signal sensor (4) forms over against a described N magnet steel (2), phase differential between first signal sensor (3) and the secondary signal sensor (4) is α, phase differential between adjacent two magnet steel (2) is β, the aliquant β of α.

2. the anti-counting assembly of the counter-rotating in the flowmeter according to claim 1 is characterized in that: the number N=18 of magnet steel (2), the phase differential between adjacent two magnet steel (2) are β=360 °/N=20 °.

3. the anti-counting assembly of the counter-rotating in the flowmeter according to claim 1 and 2 is characterized in that: described α, β and N satisfy N * | α-k * β |=80 ± 0.5 °, wherein coefficient k is positive integer.

4. counting assembly is prevented in the counter-rotating in the flowmeter according to claim 3, it is characterized in that: the phase differential α between first signal sensor (3) and the secondary signal sensor (4)=44.42 °, the number N=18 of magnet steel (2), phase difference beta between adjacent two magnet steel (2)=20 °, coefficient k=2.

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