CN217560718U

CN217560718U - Plug-in type gas ultrasonic flowmeter with calibration function

Info

Publication number: CN217560718U
Application number: CN202221769504.6U
Authority: CN
Inventors: 杨建峰
Original assignee: Hangzhou Jingrui Instrument Co ltd
Current assignee: Hangzhou Jingrui Instrument Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-10-11
Anticipated expiration: 2032-07-07

Abstract

The utility model discloses a plug-in type gas ultrasonic flowmeter with calibration function, which is characterized in that a calibration pipeline and a metering pipeline are connected through a communicating valve, the calibration pipeline and accessories thereon form a calibration unit, and the metering pipeline and accessories thereon form a metering unit; the two ends of the calibration pipeline are inserted into the ultrasonic calibration transducer, and a gas inlet and outlet valve and a temperature and pressure sensor positioning valve are arranged on the pipe body of the calibration pipeline; the two sides of the pipe body of the metering pipeline are provided with ultrasonic metering transducers with adjustable positions and temperature and pressure sensors; and electronic devices on the calibration unit and the metering unit are connected to the flowmeter host through shielded cables so as to analyze and observe the sound velocity in the flowmeter in real time. The utility model adopts the above-mentioned gas ultrasonic flowmeter, through comparing calibration pipeline and measurement pipeline sound velocity, can revise the error that measurement pipeline ultrasonic transducer brought after installing, maintaining, changing, realize that the flowmeter accuracy measurement uses with long-term stability.

Description

Plug-in type gas ultrasonic flowmeter with calibration function

Technical Field

The utility model belongs to the technical field of the instrument and meter technique and specifically relates to a bayonet gaseous ultrasonic flowmeter who possesses calibration function is related to.

Background

With the improvement of environmental protection consciousness of people in recent years, natural gas is applied more and more as clean high-quality energy, and the development of the natural gas industry is faster and faster. The main metering instruments in the natural gas industry mainly comprise a Roots meter and a turbine meter, but the traditional instruments have the defects of high requirement on metering gas quality, frequent maintenance, high maintenance cost, low intelligent degree and the like, and the defects can restrict the rapid development of the natural gas industry.

Compared with differential pressure type instruments, positive displacement instruments, traditional speed type instruments and the like, the gas ultrasonic flowmeter has the advantages of wide range ratio, intellectualization, easiness in installation, low cost, high precision, long service life, low maintenance cost and the like. Are currently widely used in the following fields: 1) Metering management of natural gas high-pressure long-distance transmission pipelines and provincial and urban level branch transmission stations; 2) Urban gas metering management; 3) Mining and utilizing natural gas and coal bed gas; 4) Liquefied natural gas and liquefied petroleum gas; 5) Large-scale industrial gas metering management; 6) Metering blast furnace gas and coke oven gas; 7) Other energy-saving emission-reduction gas emission metering and the like.

The installation form of the gas ultrasonic flowmeter can be divided into a short section type (with a pipe section), an insertion type, an external clamping type and the like. In the industrial application field, for the scenes that the pipe diameter of the gas is larger than 600mm, particularly larger than 1m, the plug-in type gas ultrasonic flowmeter is widely used in the scenes due to the reasons that the pipe section of the short-cut type flowmeter is too large and is not easy to produce and install, the signal intensity of the clip-on type flowmeter is too low, and the like. The accuracy requirements for the installation angle, the distance and the like of the transducer in the installation or maintenance process of the plug-in flowmeter are high, and if the installation angle or the distance of the transducer is installed, the metering error of the flowmeter can be introduced. The reduction of the installation angle error of the transducer can be realized by designing a special tool clamp. However, the existing plug-in ultrasonic gas flow meter has no particularly effective method for reducing the error of the transducer installation distance.

SUMMERY OF THE UTILITY MODEL

The problem of current bayonet gaseous ultrasonic flowmeter in installation and maintenance process produce transducer installation spacing error easily, this scheme has provided the bayonet gaseous ultrasonic flowmeter who possesses the calibration function, ensures that the transducer interval can carry out real-time online calibration, realizes the accurate measurement of flowmeter and uses with long-term stable.

In order to achieve the above purpose, the utility model provides the following technical proposal,

a plug-in type gas ultrasonic flowmeter with a calibration function comprises a flowmeter host, a calibration unit and a metering unit, wherein the flowmeter host receives and analyzes data of electronic devices on the calibration unit and the metering unit;

a calibration unit comprising a calibration pipe; two ends of the calibration pipeline are packaged through flanges, the ultrasonic wave calibration transducer is inserted into the calibration pipeline, and a gas inlet and outlet valve, a temperature sensor and a pressure sensor are arranged on a pipe body of the calibration pipeline;

a metering unit comprising a metering conduit; the metering pipeline is connected with the calibration pipeline through a communication valve; two ends of the metering pipeline are connected with a pipeline to be measured through flanges, and an energy converter positioning seat, a temperature sensor and a pressure sensor are installed on a pipe body of the metering pipeline; the transducer positioning seat is used for introducing the ultrasonic metering transducer into the metering pipeline and locking the ultrasonic metering transducer.

Preferably, the transducer positioning seat comprises a pipe fitting, and a ball valve is mounted on the pipe fitting; one end of the pipe fitting is connected to the pipe body of the metering pipeline through a flange, and the other end of the pipe fitting is provided with a knurled nut; the ultrasonic metering transducer is inserted into the pipe fitting and passes through the ball valve, and the tail end of the ultrasonic metering transducer is locked by a knurled nut.

The utility model adopts the above-mentioned bayonet gaseous ultrasonic flowmeter, the error that can automatic correction ultrasonic transducer bring after installing, maintaining, changing realizes that flowmeter accurate measurement and long-term stable use have very big measurement accuracy advantage than the flowmeter of current no self calibration function.

Drawings

FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention;

fig. 2 is a schematic view at the head of the calibration unit and the dosage unit according to the embodiment of the present invention.

Reference numerals

1. A flowmeter host; 2. a calibration unit; 3. a metering unit; 4. a communication valve; 21. a flange; 22. an intake valve; 23. a pressure transmission valve; 24. calibrating a pipeline; 25. wen Chuanfa; 26. an air outlet valve; 27. ultrasonic calibration of the transducer; 31. a pressure sensor; 32. knurling the nut; 33. a ball valve; 34. an ultrasonic metering transducer; 35. a temperature sensor; 36. and (4) a metering pipeline.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.

The plug-in type gas ultrasonic flowmeter with the calibration function as shown in the figure is composed of three functional units: the flowmeter comprises a flowmeter main machine 1, a calibration unit 2 and a metering unit 3.

The flowmeter main unit 1 generally has functions of human-computer interface interaction, signal access, online calibration, gas flow calculation, signal output and the like. The signal access function comprises power supply access, temperature signal access, pressure signal access, ultrasonic signal access for metering, ultrasonic signal access for calibration and the like. The signal output function comprises RS-485, 4-20mA current output, pulse signal output and the like. The specific appearance, size and installation form of the host computer of the product are different according to different application requirements.

The calibration unit 2 comprises a calibration pipeline 24, two ends of the calibration pipeline 24 are packaged through flanges 21 and are inserted into the ultrasonic verification transducer, a gas inlet and outlet valve, wen Chuanfa and a pressure transmission valve 23 are arranged on a pipe body of the calibration pipeline, and Wen Chuanfa and the pressure transmission valve 23 are used for being detachably introduced into the temperature sensor 35 and the pressure sensor 31. In particular, the ultrasonic calibration transducer 27 is connected to the calibration pipe 24 by means of the flange 21 and is locked by means of a knurled nut 32; wen Chuanfa 23, pinch valve 25, inlet valve 22, outlet valve 26, etc. are welded to calibration pipe 24.

The metering unit 3 comprises a metering pipeline 36, and the metering pipeline 36 is connected with the calibration pipeline 24 through the communication valve 4. Two ends of the metering pipeline 36 are connected with a pipeline to be measured through flanges 21, and a transducer positioning seat, a temperature sensor 35 and a pressure sensor 31 are installed on the body of the metering pipeline 36. The transducer locator socket is used to introduce the ultrasonic metering transducer 34 into the metering tube 36 and to lock the ultrasonic metering transducer 34. The transducer positioning seat comprises a pipe fitting, and a ball valve 33 is arranged on the pipe fitting; one end of the pipe fitting is connected to the pipe body of the metering pipeline 36 through a flange 21, and the other end of the pipe fitting is provided with a knurled nut 32; an ultrasonic metering transducer 34 is inserted into the pipe and through the ball valve 33, the end being locked by a knurled nut 32. After opening the ball valve 33, the ultrasonic metering transducer 34 can be inserted into the gas pipe and then secured by tightening the knurled nut 32.

The ultrasonic calibration transducer 27 and the ultrasonic metering transducer 34 in the device belong to ultrasonic transducers, and comprise a transmitting transducer and a receiving transducer. Electronic devices such as the ultrasonic transducer, the temperature sensor 35 and the pressure sensor 31 are connected with the flowmeter main machine 1 through shielding cables.

Principle of operation

The self-calibration principle is realized in two steps: the calibration unit is set and the metering unit is corrected.

1. The calibration unit sets: the principle is that the sound velocity checking principle of the ultrasonic flowmeter is used for checking (see national standard GB/T30500-2014 & lt inspection sound velocity checking method in use of gas ultrasonic flowmeter). It is recommended to use nitrogen as the standard source of the test gas. The theoretical sound velocity of the elemental gas can be found by a table look-up method. The method comprises the following steps:

s11, closing the communication valve, and installing the temperature sensor and the pressure sensor through the temperature transmission valve and the pressure transmission valve.

S12, opening an air inlet valve and an air outlet valve, and inputting nitrogen to replace natural gas in the calibration pipeline.

S13, measuring the sound velocity in the nitrogen, measuring the temperature and the pressure value, and comparing the measured sound velocity of the calibration unit with the theoretical sound velocity of the nitrogen under the pressure and the temperature.

And S14, adjusting the measured sound velocity and the theoretical sound velocity of the calibration unit to be consistent, and finishing the setting of the calibration unit.

2. And (3) correcting a metering unit: the principle is that the sound velocity is the same under the same temperature and pressure of the same gas, so the error of the installation distance of the transducer can be corrected by comparing the sound velocity of the calibration unit with the sound velocity of the measurement unit. The method comprises the following steps:

and S21, closing all valves on the calibration unit and opening the communication valves. Because of the movement and circulation of the gas molecules, the gas composition in the calibration unit will come to be in line with that in the metering unit over time, and the temperature and pressure will be substantially the same.

And S22, the flowmeter host receives the ultrasonic signals, the temperature signals, the pressure signals and the like, and calculates sound velocities of the calibration unit and the metering unit by using a time difference method.

And S23, comparing the sound velocity of the calibration unit with the sound velocity of the metering unit by the flowmeter host, adjusting the mounting distance of the transducer to enable the two sound velocities to be consistent, and finishing the correction of the metering unit.

It should be noted that when the self-calibration unit is not detached from the hardware, the calibration unit setting only needs to be performed at the first time of installation, and if the hardware is detached, the setting needs to be reset. After the transducer in the metering unit is installed, maintained, replaced and the like, the error flowmeter host of the installation distance can automatically give a correction prompt.

The above are specific embodiments of the present invention, but the scope of protection of the present invention should not be limited thereto. Any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are covered by the protection scope of the present invention, and therefore, the protection scope of the present invention is subject to the protection scope defined by the claims.

Claims

1. A plug-in type gas ultrasonic flowmeter with a calibration function is characterized by comprising a flowmeter host, a calibration unit and a metering unit, wherein the flowmeter host receives and analyzes data of electronic devices on the calibration unit and the metering unit;

2. The ultrasonic gas flowmeter of claim 1 wherein the transducer positioning socket comprises a tube on which the ball valve is mounted; one end of the pipe fitting is connected to the pipe body of the metering pipeline through a flange, and the other end of the pipe fitting is provided with a knurled nut; the ultrasonic metering transducer is inserted into the pipe fitting and passes through the ball valve, and the tail end of the ultrasonic metering transducer is locked by a knurled nut.