CN110388972B - Serial calibrating device and method for non-isodiametric ultrasonic flowmeter - Google Patents
Serial calibrating device and method for non-isodiametric ultrasonic flowmeter Download PDFInfo
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- CN110388972B CN110388972B CN201810345222.5A CN201810345222A CN110388972B CN 110388972 B CN110388972 B CN 110388972B CN 201810345222 A CN201810345222 A CN 201810345222A CN 110388972 B CN110388972 B CN 110388972B
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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Abstract
The invention discloses a series calibration device and method for a non-isodiametric ultrasonic flowmeter, and belongs to the field of natural gas metering. The method comprises the following steps: a plurality of non-equal diameter pipelines are connected in series through a rectifying device, the flow velocity of fluid is uniformly changed when the fluid passes through the reducing and diameter-changing section, and the fluid is rectified when passing through the rectifying section and stably flows into the rear pipeline. And respectively installing ultrasonic flow meters with corresponding calibers on each pipeline to obtain the measurement data of each ultrasonic flow meter. The invention provides a serial calibration device and method for a non-isodiametric ultrasonic flowmeter, which enable fluid to stably enter a rear pipeline from a front pipeline through rectifying equipment. The plurality of non-equal-diameter ultrasonic flow meters are arranged on the corresponding pipelines, the measurement data of the plurality of non-equal-diameter ultrasonic flow meters can be acquired simultaneously, the verification of the plurality of non-equal-diameter ultrasonic flow meters can be completed without batch measurement, the consumed time is short, and the labor force is saved.
Description
Technical Field
The invention relates to the field of natural gas metering, in particular to a series calibration device and method for a non-isodiametric ultrasonic flowmeter.
Background
Ultrasonic flow meters are velocity-type flow meters that measure volumetric flow by detecting the effect of fluid flow on supersonic velocity. Due to the characteristics of almost no interference to fluid, the ultrasonic flowmeter is widely applied to measurement of natural gas flow in a pipeline. In order to make the measurement result more accurate, the ultrasonic flowmeter needs to be calibrated before measurement.
The prior art performs the calibration of ultrasonic flow meters in the following manner: the ultrasonic flow meters with the same caliber are clamped on the pipelines with the corresponding calibers, and whether the measurement results of the ultrasonic flow meters are accurate or not is judged through comparison of the measurement results of different flow meters, so that the purpose of verification is achieved. When the calibers of the ultrasonic flowmeters to be calibrated are different, batch calibration is required according to the calibers, and the ultrasonic flowmeters with the same calibers can only be calibrated each time.
Designers have found that the prior art suffers from at least the following problems:
the calibration of the ultrasonic flow meters with different calibers needs to be performed in batches according to the calibers, the time consumption is long, and the labor consumption is large.
Disclosure of Invention
The embodiment of the invention provides a device and a method for measuring the flow of a pipeline, which can solve the technical problem. The specific technical scheme is as follows:
in a first aspect, a serial verification apparatus for non-equal-diameter ultrasonic flow meters is provided, which is used for verifying a plurality of non-equal-diameter ultrasonic flow meters, and includes: a plurality of non-equal diameter pipes adapted to said ultrasonic flow meter, said apparatus further comprising: a rectifying device for connecting a plurality of said pipes in series;
the rectifying device includes: a reducing section and a rectifying section which are formed in sequence along the fluid flowing direction;
the front end of the reducing and diameter-changing section has the same diameter as the front pipeline, and the rear end of the reducing and diameter-changing section has the same diameter as the rear pipeline;
the molded line of the central section of the reducing and diameter-changing section is a straight line, a Winsissiki curve or a power exponent curve, so that the fluid is uniformly accelerated in the reducing and diameter-changing section;
the diameter of the rectifying section is the same as that of the rear pipeline, and the rectifying section is used for rectifying the fluid and enabling the fluid to uniformly and stably flow into the rear pipeline.
In one possible design, the inside of the front end of the rectifying section is of a honeycomb structure, and the inside of the rear end of the rectifying section is provided with a damping net.
In one possible design, the length of the tapered section is 1-5 times the inner diameter of the preceding pipe.
In a second aspect, there is provided a method of performing a serial non-isometric ultrasonic flow meter assay using the apparatus of any one of the above, the method comprising:
connecting a plurality of non-equal-diameter pipelines in series through rectifying equipment, uniformly accelerating fluid when the fluid passes through the reducing and diameter-changing section, rectifying the fluid through the rectifying section, and enabling the fluid to flow into a rear pipeline from the front pipeline in a smooth mode;
and respectively installing ultrasonic flowmeters with corresponding calibers on each pipeline to obtain the measurement data of each ultrasonic flowmeter.
In one possible design, the distance between the front end of the ultrasonic flow meter on the rear pipe and the rear end of the flow straightening device is 0.4-0.6 times the inner diameter of the front pipe.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the serial calibration device for the non-equal-diameter ultrasonic flowmeter, provided by the embodiment of the invention, the plurality of non-equal-diameter pipelines are connected in series through the rectifying equipment, so that fluid can stably enter the rear pipeline from the front pipeline. A plurality of non-equal-diameter ultrasonic flow meters are arranged on corresponding pipelines, and measurement data of the non-equal-diameter ultrasonic flow meters can be acquired simultaneously. The verification of a plurality of non-equal-diameter ultrasonic flow meters can be completed without batch measurement, the consumed time is short, and the labor force is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the serial inspection timing of a non-isometric ultrasonic flow meter provided by an embodiment of the present invention;
fig. 2 is a cross-sectional view of a rectifying section in a serial calibration apparatus of a non-isodiametric ultrasonic flow meter according to an embodiment of the present invention.
The reference numerals denote:
1-an ultrasonic flow meter, wherein,
2-a pipeline, namely a pipeline,
201-a preceding pipe-line,
202-at the back of the pipe,
3-a rectifying device is arranged on the tower body,
301-a section of tapering and reducing diameter,
302-rectifying section.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In a first aspect, an embodiment of the present invention provides a serial calibration apparatus for a non-equal-diameter ultrasonic flow meter, which is used to calibrate a plurality of non-equal-diameter ultrasonic flow meters 1, and includes: a plurality of non-equal-diameter pipes 2 adapted to the ultrasonic flowmeter 1, and a rectifying device 3 for connecting the plurality of pipes 2 in series;
the rectifying device 3 includes: a tapered and tapered section 301 and a rectifying section 302 formed in this order in the fluid flow direction;
the front end of the tapered section 301 has the same diameter as the front pipe 201, and the rear end has the same diameter as the rear pipe 202;
the molded line of the central section of the reducing and diameter-changing section 301 is a straight line, a Winsissiki curve or a power exponent curve, so that the fluid is accelerated uniformly in the reducing and diameter-changing section 301;
the diameter of the rectifying section 302 is the same as that of the rear pipe 202, and is used for rectifying the fluid so that the fluid can uniformly and stably flow into the rear pipe 202.
The working principle of the serial calibration device for the non-isodiametric ultrasonic flowmeter provided by the embodiment of the invention is described as follows:
the plurality of pipelines 2 are connected in series through the rectifying device 3, and the flowing process of the fluid is uniformly accelerated when passing through the reducing and reducing section 301, so that the flowing stability and uniformity of the fluid flow in the reducing and reducing section 301 are ensured, the influence on the measurement data of the ultrasonic flowmeter 1 on the front pipeline 201 is reduced to the maximum extent, meanwhile, a stable and uniform inlet section flow field is provided for the rear pipeline 202, and the measurement data of the ultrasonic flowmeter 1 on the rear pipeline 202 is accurate.
The molded line of the central section of the reducing section 301 is a straight line, a Winsissie curve or a power exponent curve, so that the stability and the uniformity of the fluid flowing in the reducing section 301 are high, the turbulence degree of the fluid passing through the reducing section 301 is low, and the purpose of uniformly accelerating the fluid is met.
The flow straightening section 302 can straighten the flow, so that the flow passing through the flow straightening section 302 can smoothly flow into the rear pipe 202, and the measurement accuracy of the ultrasonic flowmeter 1 on the rear pipe 202 is further improved. And the diameter of the rectifying section 302 is the same as that of the rear pipe 202, so that the rectified fluid does not generate turbulence due to the change of the flow velocity when entering the rear pipe 202. It can be seen that the rectifying device 3 can enable the fluid in the front pipeline 201 to smoothly flow into the rear pipeline 202, so that the disturbance of the turbulence generated when the fluid enters the rear pipeline 202 on the measurement data of the ultrasonic flowmeter 1 is avoided, and the verification result is relatively accurate.
The flow in the plurality of pipelines 2 connected in series by the plurality of rectifying devices 3 is equal, the plurality of non-equal-diameter ultrasonic flow meters 1 are arranged on the pipelines 2 with corresponding calibers, the measurement data of the plurality of non-equal-diameter ultrasonic flow meters 1 can be obtained simultaneously, and then whether the measurement data of each ultrasonic flow meter 1 is accurate or not is known, and the ultrasonic flow meters 1 are calibrated.
It can be seen that the non-isometric ultrasonic flow meter serial calibration device provided in the embodiment of the present invention connects a plurality of non-isometric pipelines 2 in series through the rectifying device 3, so that fluid can smoothly enter the rear pipeline 202 from the front pipeline 201. By mounting a plurality of non-equal-diameter ultrasonic flow meters 1 on corresponding pipes 2, measurement data of the plurality of non-equal-diameter ultrasonic flow meters 1 can be acquired simultaneously. Compared with the prior art, the verification of the plurality of non-equal-diameter ultrasonic flow meters 1 can be completed without batch measurement, the time consumption is short, and the labor force is saved.
The intersection line of the plane where the central axis of the tapered and tapered section 301 is located and the tapered and tapered section 301 is the profile line of the central section of the tapered and tapered section 301.
Taking the upstream as the front and the downstream as the rear when the fluid flows, for two adjacent pipes 2 and the rectifying device 3 therebetween, the pipe 2 located upstream of the rectifying device 3 is taken as a preceding pipe 201, and the pipe 2 located at the rear end of the rectifying device 3 is taken as a following pipe 202. That is, the duct 2 at the front end is the front duct 201 and the duct 2 at the rear end is the rear duct 202, with the rectifying device 3 as the intermediary.
The front end of the tapered section 301 has the same diameter as the front pipe 201, the rear end has the same diameter as the rear pipe 202, the diameter of the front pipe 201 is larger, the diameter of the rear pipe 202 is smaller, and the fluid flows through the large-caliber ultrasonic flowmeter 1 (arranged on the front pipe 201), the rectifying device 3, and the small-caliber ultrasonic flowmeter 1 (arranged on the rear pipe 202) in sequence.
When the fluid flow rate changes, turbulence conditions such as vortexes or irregular flows are easily generated, and the rectification section 302 rectifies the fluid to eliminate the fluid vortexes and convert the irregular flowing fluid into regular flowing fluid.
The following respectively explains each component of the non-isodiametric ultrasonic flowmeter series calibration device provided by the embodiment of the invention and the function thereof:
in the embodiment of the present invention, the rectifying section 302 is used for rectifying the fluid, and as for the structure of the rectifying section 302, the following description is given as an example:
the inside honeycomb structure that is of the front end of rectification section 302, and the inside damping net that is provided with of the rear end of rectification section 302.
So set up, after the fluid got into the rectifying section 302, evenly backward flow through honeycomb's nest hole, then flow through the damping net and get into pipeline 202 behind, honeycomb and damping net play the rectification effect to the fluid in the flow process, eliminate the swirl, make irregular flowing fluid become the rule.
The honeycomb structure can be formed by closely combining a plurality of pipelines with regular hexagonal sections side by side. The cross-sectional area and the length of each of the plurality of regular hexagonal pipes are equal, and the cross-sectional area of each of the square pipes may be 1/10-1/30 of the inner diameter of the rectifying section 302, for example, 1/10, 1/20, 1/30 of the inner diameter of the rectifying section 302.
The total cross-sectional area of the honeycomb structure is equal to the cross-sectional area of the fairing section 302, i.e., the outer walls of the honeycomb structure are in contact with the inner walls of the fairing section 302. The length of the honeycomb structure may be 1/3-2/3 of the length of the fairing section 302, for example 1/3, 1/2, 2/3, etc. of the length of the fairing section 302.
In addition, the front end of the rectifying section 302 may be provided with other porous structures, such as a circular hole structure formed by closely combining a plurality of circular pipes side by side. Or, the square hole mechanism can be formed by combining a plurality of square pipelines closely side by side.
The damping net is a net-shaped medium for stabilizing flow, removing impurities and removing bubbles, which is common in the field, for example, a damping type titanium wire gas-liquid filter net sold by Poulina wire mesh Co., Ltd. in Anping county can be used as the damping net used in the embodiment of the invention.
In the embodiment of the present invention, the length of the tapered and reduced-diameter section 301 is 1 to 5 times the inner diameter of the front pipe 201. With the arrangement, the length of the reducing and reducing section 301 is within a preset range, the flow velocity of the fluid does not change suddenly in the reducing and reducing section 301, and the turbulence degree of the fluid in the flow velocity changing process is further reduced. For example, if the inner diameter of the front pipe 201 is D, the length of the tapered section 301 may be 1D, 2D, 5D, etc.
In a second aspect, an embodiment of the present invention provides a method for performing pipe flow measurement by using the apparatus described in any one of the above, where the method includes:
a plurality of non-equal-diameter pipelines 2 are connected in series through a rectifying device 3, fluid is uniformly accelerated when passing through a reducing and reducing section 301, is rectified through a rectifying section 302 and flows into a rear pipeline 202 from the inside of a front pipeline 201 in a smooth mode;
an ultrasonic flowmeter 1 with a corresponding caliber is respectively arranged on each pipeline 2, and the measurement data of each ultrasonic flowmeter 1 is obtained.
According to the serial calibration method for the non-equal-diameter ultrasonic flow meter, provided by the embodiment of the invention, the plurality of non-equal-diameter pipelines 2 are connected in series through the rectifying equipment 3, so that fluid can stably enter the rear pipeline 202 from the front pipeline 201. By mounting a plurality of non-equal-diameter ultrasonic flow meters 1 on corresponding pipes 2, measurement data of the plurality of non-equal-diameter ultrasonic flow meters 1 can be acquired simultaneously. Compared with the prior art, the verification of the plurality of non-equal-diameter ultrasonic flow meters 1 can be completed without batch measurement, the time consumption is short, and the labor force is saved.
Wherein, the distance between the front end of the ultrasonic flowmeter 1 on the rear pipeline 202 and the rear end of the rectifying device 3 is 0.4-0.6 times of the inner diameter of the front pipeline 201. So set up, make to have certain distance between ultrasonic flowmeter 1 and the fairing 3 on rear pipeline 202, make the fluid after the rectification steadily flow into rear pipeline 202, make measuring result more accurate.
The distance between the front end of the ultrasonic flowmeter 1 on the rear pipe 202 and the rear end of the rectifying device 3 is 0.4 to 0.6 times the inner diameter of the front pipe 201. For example, if the inner diameter of the front pipe 201 is D, the distance between the front end of the ultrasonic flow meter 1 and the rear end of the rectification device 3 may be 0.4D, 0.5D, 0.6D, and the like.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A non-isometric ultrasonic flow meter serial verification apparatus for verifying a plurality of non-isometric ultrasonic flow meters (1), comprising: a plurality of non-equal diameter pipes (2) adapted to the ultrasonic flow meter (1), characterized in that the device further comprises: -a rectifying device (3) for connecting a plurality of said ducts (2) in series;
the rectifying device (3) comprises: a tapered and variable-diameter section (301) and a rectifying section (302) which are formed in sequence along the fluid flow direction;
the front end of the tapered and variable-diameter section (301) is the same as the diameter of the front pipeline (201), the rear end of the tapered and variable-diameter section is the same as the diameter of the rear pipeline (202), the diameter of the front pipeline (201) is larger, the diameter of the rear pipeline (202) is smaller, and the length of the tapered and variable-diameter section (301) is 1-5 times the inner diameter of the front pipeline (201);
the molded line of the central section of the reducing and reducing section (301) is a straight line, a Winsissiki curve or a power exponent curve, so that the fluid is uniformly accelerated in the reducing and reducing section (301);
the diameter of the rectifying section (302) is the same as that of the rear pipeline (202), a honeycomb structure is arranged inside the front end of the rectifying section (302), the honeycomb structure is formed by tightly combining a plurality of pipelines with regular hexagonal sections side by side, the sectional areas and the lengths of the plurality of regular hexagonal pipelines are equal, the outer wall of the honeycomb structure is in contact with the inner wall of the rectifying section (302), the length of the honeycomb structure is 1/3-2/3 of the length of the rectifying section (302), and a damping net is arranged inside the rear end of the rectifying section (302) and used for rectifying the fluid so that the fluid can uniformly and stably flow into the rear pipeline (202);
the distance between the front end of the ultrasonic flowmeter (1) on the rear pipeline (202) and the rear end of the rectifying device (3) is 0.4-0.6 times of the inner diameter of the front pipeline (201).
2. A method of performing a serial calibration of a non-isometric ultrasonic flow meter using the apparatus of claim 1, the method comprising:
connecting a plurality of non-equal-diameter pipelines (2) in series through a rectifying device (3), wherein fluid is uniformly accelerated when passing through the reducing and reducing section (301), is rectified through the rectifying section (302), and flows from the inside of the front pipeline (201) into the inside of the rear pipeline (202) in a smooth mode;
and respectively installing ultrasonic flowmeters (1) with corresponding calibers on each pipeline (2) and acquiring the measurement data of each ultrasonic flowmeter (1).
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| US8844359B2 (en) * | 2010-12-03 | 2014-09-30 | Hema-Q, Inc. | Apparatus for noninvasive measurement of properties of a fluid flowing in a tubing having a smaller inner diameter passage |
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| CN106323392A (en) * | 2015-06-23 | 2017-01-11 | 威海市天罡仪表股份有限公司 | An anti-interference measuring pipe segment of an ultrasonic flow sensor |
| CN107014450B (en) * | 2017-04-29 | 2023-11-14 | 成都伦慈仪表有限公司 | Noise reduction rectifying structure and ultrasonic flowmeter comprising same |
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