CN201053885Y - Noise detection flow meter - Google Patents

Abstract

The utility model provides a noise detection flowmeter. A pickup sensor with a probe arranged on the inner wall of the pipe is connected with an OP07 amplifier, a DPS sampling chip and an mc80196 chip microprocessor, and is provided with a signal termination that is communicated with a display. When in use, the probe of the pickup sensor is arranged on the inner wall of the pipe; collecting the water sound and the gas flow sound inside the pipe, and the noise signal is sampled by an amplifying circuit and a high-speed chip to be multiplied; the processed value is undertaken the interposition and the smooth wave filtering; with mathematic small wave transformation principle noise-removal model, the flow power spectrum is reserved, and the spectrum is undertaken the digit analysis, and the flow rate of the correspondent fluid is extracted to be read in the microprocessor, thereby different values are displayed on the display. The utility model has the obvious advantages of stable instrument coefficient, high accuracy, long service life and small maintenance work, thereby maintaining the accuracy in different working environments.

Description

The noise detection flowmeter

Affiliated technical field

The utility model relates to a kind of flowmeter that is used to calculate interior liquid of pipeline or gas flow, a kind of specifically noise detection flowmeter.

Background technology

Now the flowmeter that uses has two kinds of mechanical type and electronic types, traditional mechanical flow meter exists volume to weigh greatly, install and use, safeguard very trouble, wearing and tearing back precise decreasing, though and electronic type is more convenient in the use, but still exist be subjected to that fluid is conspired, the influence of pressure, temperature and the multiple parameter of viscosity is bigger, and installation and maintenance extremely bothers, cost is also high.

Summary of the invention

The utility model provides a kind of noise detection flowmeter, can be with limit filtering and sampling by the circulation noise of liquids and gases being surveyed the back, changes flow velocity or flow value accurately into.

The utility model comprises sound pickup sensor and OP07 amplifier and DPS sampling A, and the technical scheme that is adopted is: the sound pickup sensor that probe can be installed in inner-walls of duct connects behind OP07 amplifier, DPS sampling A, the mc80196 chip microprocessor signalization termination in regular turn by lead and is connected with display and communicates.

The utility model can be installed in the probe of sound pickup sensor the inner-walls of duct that needs metering, noise that produces when utilizing the pipeline inner fluid to flow and flow rate of fluid and flow have the principle of certain relation, the size and the frequency spectrum data that detection are obtained noise are with limit filtering and sampling, the size of analysis-by-synthesis energy work rate spectrum changes flow velocity or flow value accurately into.

The utility model is compared with existing flowmeter, there have not been movable mechanical component, be not subjected to when surveying volumetric flow rate that fluid density, pressure, temperature and viscosity are isoparametric to be influenced, have easy to install, the life-span is long, maintenance is little, instrument coefficient is stable, accuracy is high, can guarantee the distinguishing feature of precision in various environment.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Accompanying drawing is the utility model structural representation.

Embodiment

Shown in the accompanying drawing embodiment: the sound pickup sensor 1 that probe can be installed in inner-walls of duct connects OP07 amplifier 2, DPS sampling A 3, signalization terminations, mc80196 chip microprocessor 4 back in regular turn by lead and is connected with display 5 and communicates.

When the utility model is implemented, after the pipeline boring with the need metering, the probe of sound pickup sensor 1 is inserted boring probe contact pipeline inner wall sealing is fixed, the signal termination is linked to each other with display 5 after connecting OP07 amplifier 2, DPS sampling A 3, mc80196 chip microprocessor 4 in regular turn by lead.During user mode, the probe of sound pickup sensor 1 passes through liquid or gas flow sound-detection, carry out a series of multiply accumulating operation through the stable amplifying circuit of OP07 amplifier 2 and the noise signal of DPS sampling A 3 fluid flow, carry out interpolation and smothing filtering again through 4 pairs of digital samples of mc80196 chip microprocessor again, with digital form to signals collecting, conversion, filtering, valuation, strengthen, compression, identification etc. are handled at a high speed in real time, applied mathematics theory of wavelet transformation denoising model, keep the power noise frequency spectrum that flows, utilize FTT digital spectrum analysis technology, extract the big or small pairing rate of flow of fluid V (t) of noise power spectrum, its processing formula is:

V(t)∝Δt

$q=\mathrm{kS}\&times;v\left(t\right)=k\frac{{\mathrm{\&pi;<figure-callout\; id="2"\; label="D"\; filenames="Y20072008561900061.png"\; state="\{\{state\}\}">D</figure-callout>}}^2}{4}\&times;v\left(t\right)$

Wherein: k is update the system constant (the medium experiment draws)

S is the m of inner-walls of duct cross-sectional area unit ²

D is inner-walls of duct diameter units m

V (t) medium is at the ducted m/s of instantaneous velocity unit

Flow meter calibration flow size, determine the funtcional relationship of the size of mass rate and sensor output complex energy power spectrum, then function and data processing method are write into composition system in the storage of mc80196 chip microprocessor 4 programs, demonstrate flow value and aggregate-value by display 5 at last.

Claims (1)

1. noise detection flowmeter, comprise sound pickup sensor (1) and OP07 amplifier (2) and DPS sampling A (3), it is characterized in that: the sound pickup sensor (1) that probe can be installed in inner-walls of duct connects OP07 amplifier (2), DPS sampling A (3), signalization termination, mc80196 chip microprocessor (4) back in regular turn by lead and is connected with display (5) and communicates.

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