CN85202918U - Sensor for measuring the flow of conductive liquid - Google Patents

Abstract

The utility model relates to a sensor for measuring the flow of conductive liquid. The sensor comprises a rotary body and an electrifying electrode, wherein, the rotary body can rotate as the flow of fluid, and the electrifying electrode converts the rotary number of the rotary body into an electrical pulse. By means of the scanning of a rotary insulator around the electrifying electrode, the sensor converts the scanning of the insulator (such as a plastic wheel blade of the rotary body) every time into the electric pulse one by one to realize the conversion from the flow to an electric signal. The sensor is suitable for a user to measure the flow of the conductive liquid and particularly the flow of running water and industrial wastewater.

Description

Sensor for measuring the flow of conductive liquid

The utility model belongs to the sensor of a kind of measurement conducting liquid flow, particularly tap water, industrial waste water flow.

Known flow sensor, for example: the turbine flow flowmeter sensor, electromagnet flow meter sensor, ultrasonic flow flowmeter sensor etc., its structure and the circuit of being joined are very complicated, and turbo flow meter and electromagnetic flowmeter have some harsh requirements again to pipeline.This makes known these sensor cost height, installs and uses inconvenience, has limited popularizing of they.

Therefore, the purpose of this utility model is, provides a kind of structure more simple and reliable, cheap novel flow sensor.It can be with the speed mode propeller flowmeter, ellipse garden gear meter, and rotz flowmeter, the rotating speed that is directly proportional with instantaneous delivery of the rotary body in the rotary piston flowmeter converts the frequency of electric pulse to with being directly proportional.

According to the utility model, this sensor is made up of two parts.First is the part that flow is converted to the revolution of rotary body, and it mainly is the rotary body that flow rotate of an energy with fluid, and its rotating speed is proportional to the instantaneous velocity of fluid, and it is made by insulating material (for example plastics).This rotary body can be done the various shape that wheel blade is arranged as required, make its energy of rotation cause that the electric field near the conducting liquid of electrode takes place clocklike to change, second portion be with the revolution direct ratio of rotary body convert the part of electric pulse number to, mainly be the electrode of energising, this electrode is contained on the pairing tube wall of outer garden bus of rotary body.

Principle of the present utility model is, utilize near insulator the scanning powered electrode of rotation, change the electric field level and the shape of near the conducting liquid of electrode, with insulator (the plastics wheel blade blade of routine rotary body) scan the electric pulse that becomes one by one at every turn, thereby realize that flow is to the conversion between electric signal.

As a further feature, on the certain tube wall at a distance of ionization electrode, a lead end is housed also, is connected to a Dc low voltage power supply and a pull-up resistor between electrode and the lead end.Electric impulse signal is by electrode, the output of lead end two ends.

Compared with the prior art, sensor of the present utility model has tangible advantage.This sensor does not have excitation and magnetic circuit system, does not encourage receiving system, and structure is very simple, and the output signal amplitude can reach tens millivolts, the signal to noise ratio (S/N ratio) height, and it is simple to measure display circuit.It is specially adapted to measure the flow of tap water and industrial waste water.

The rotary body of the different responses of sensor adapted of the present utility model can constitute multi-form flow and take into account surveying instrument (routine ship's speed table etc.).

Provide an embodiment below.Description and accompanying drawing by this embodiment provide details of the present utility model.

Accompanying drawing is the synoptic diagram of this sensor.

Each parts is represented with (1), (2), (3), (4), (5) among the figure.

In the present embodiment, parts (1) are impellers made of plastic, are supported by the support (5) that is fixed in the pipeline (2).Electrode (3) is installed on tube wall, and it reaches outside the pipe by the aperture of tube wall.Electrode (3) is by corrosion resistant conductive material, and for example stainless steel is made.Electrode (3) carries out electrical isolation with insulation sleeve (4) except that over against the end face of impeller wheel blade between all the other each faces and conducting liquid.The thickness b of impeller wheel blade edge is 2～3 times of electrode diameter size.The size shape of each wheel blade of impeller is identical.Wheel blade turns to its outer edge surface when relative with electrode (shown position), between the two apart from △=0.4～0.8 millimeter.On the metallic conduit wall, be connected to a lead end (C).Electrode (3), resistance (R), power supply (E) and metallic conduit lead end (C) are connected into circuit as shown in the figure.

When if the conducting liquid pipeline is made of insulating materials, lead end is made with the anti-corrosion electric conducting material, and need extend in the pipeline. Distance between lead end and electrode (3) should be greater than 30 millimeters. Lead end extends in the pipeline, with the contacted part of conducting liquid, its area should be not less than 100 square millimeters.

Impeller is under conducting liquid promotes and rotate, and its velocity of rotation is proportional to the instantaneous velocity of conducting liquid. Because wheel blade is to be made by insulating materials, thereby wheel blade whenever scans once near electrode, just makes that electric field level and the boundary shape of conducting liquid takes place once to change near the electrode. The variation of electric field makes (A), (B) point-to-point transmission produce a potential pulse. Wheel blade whenever scans the variation that once just produces electric field level and shape, also just produces an electric pulse, thereby the frequency of electric pulse just is proportional to the rotating speed of impeller, just has been proportional to instantaneous delivery.

For the sensor of structure as shown in the figure, be used for measuring the flow of running water, when the E=6 volt, when R=100～300 kilo-ohm, △＜0.8 millimeter, the amplitude of sensor output pulse can be greater than 40 millivolts.

Measure the frequency of above-mentioned electric pulse with electronic circuit, get final product to get the instantaneous delivery of tested conducting liquid. Go out the electric pulse number with electronic circuit accumulative total, can get the measured flux size.

During a large amount of production, the electronic circuit of joining with sensor can be made into special IC, with the reliability that improves circuit and the cost that reduces circuit.

Claims (13)

1, a kind of sensor that is used to measure the conducting liquid flow, it has an energy to rotate along with flowing of fluid, its rotating speed is proportional to the rotary body of the instantaneous velocity of fluid, it is characterized in that, rotary body (1) is to be made by electrically insulating material (as plastics), on the tube wall of the outer garden of rotary body bus correspondence, be fixed with an electrode (3), electrode (3) passes outside the pipe by the aperture of pipeline, ionization electrode on tube wall (3) also is fixed with lead end (C) greater than 30 millimeters places, be connected to a pull-up resistor (R) and direct supply (E) between electrode (3) and the lead end (C), rotary body (1) is made the shape of wheel blade, make its energy of rotation cause that the electric field near the conducting liquid of electrode (3) takes place clocklike to change, the caused electric impulse signal of electric field change is from signal output part (A), (B) draw.

2, a kind of sensor as claimed in claim 1 is characterized in that, rotary body (1) can be made the impeller shape.

3, a kind of sensor as claimed in claim 2 is characterized in that, each wheel blade of impeller, and its shape and size should be the same.

4, a kind of sensor as claimed in claim 1 is characterized in that, electrode (3) should be made with stainless steel or other corrosion resistant conductive material.

5, a kind of sensor as claimed in claim 1 is characterized in that, except that with the rotary body opposing end faces, carry out electrical isolation with insulation sleeve (4) between other surfaces of electrode (3) and conducting liquid.

6, a kind ofly it is characterized in that as claim 2,3,4,5 described sensors impeller wheel blade edge thickness is 2～3 times of electrode (3) diameter.

7, a kind of sensor as claimed in claim 6 is characterized in that, the outer edge surface of each wheel blade is during over against electrode (3), and between outer edge surface and the electrode (3) is 0.4～0.8 millimeter apart from △.

8, a kind of sensor as claimed in claim 1 is characterized in that, when fluid line was conductive conduits (as metallic conduit), lead end (C) is electric being connected on the tube wall directly.

9, a kind of sensor as claimed in claim 1 is characterized in that, fluid line is an insulating material when making, and lead end (C) can pass tube wall and enter in the pipe.

10, a kind of sensor as claimed in claim 9 is characterized in that, lead end (C) is made with corrosion resistant conductive material.

11, a kind of sensor as claimed in claim 10 is characterized in that, electrical-contact area is not less than 100 square millimeters between described lead end (C) and conducting liquid.

12, a kind of sensor as claimed in claim 1 is characterized in that, the resistance size of described resistance (R) is 100～300 kilohms.

13, a kind ofly it is characterized in that as claim 1,12 described sensors described direct supply (E) is 6 volts.

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