CN111854869A - A Precession Vortex Differential Pressure Mass Flow Meter - Google Patents

Abstract

The invention relates to a precession vortex differential pressure type mass flowmeter, comprising a venturi tube and a sensing device, instrument flanges are installed at both ends of the venturi tube, a vortex generator and a de-swirl rectifier are arranged inside, and the sensing device includes The converter, the differential pressure signal acquisition and processing unit and the piezoelectric sensor which are all electrically connected to it, the differential pressure signal acquisition and processing unit is connected with the venturi tube through the upstream pressure taking pipe and the downstream pressure taking pipe, and the upstream pressure taking pipe is installed in the venturi The cylindrical section of the tube, the downstream pressure taking tube is installed at the throat of the Venturi tube; the piezoelectric sensor is installed in the outlet diffuser section of the Venturi tube through the mounting seat. Through the above scheme, mass flow measurement can be completed, and at the same time, mass flow, fluid density, differential pressure, frequency, etc. can be accurately measured; the instrument has high measurement accuracy, stable and reliable work, high integration, compact structure, and can display and output multiple data and easy communication.

Description

A Precession Vortex Differential Pressure Mass Flow Meter

technical field

The present invention relates to the technical field of flowmeter technology, in particular to a precession vortex differential pressure mass flowmeter.

Background technique

Metrology is the eyes of industrial production. Flow measurement is one of the components of measurement science and technology, and it is closely related to the national economy, national defense construction, and scientific research. Doing this work well plays an important role in ensuring product quality, improving production efficiency, and promoting the development of science and technology, especially in the current era of energy crisis and increasing automation of industrial production, flowmeters play an important role in the national economy. status and role are more obvious.

There are many types of fluids with different physical properties, and the on-site process parameters are diverse and changeable, such as steam whose temperature and pressure change with the seasons, and natural gas and gas whose components change at any time. In view of these characteristics of fluids, instrument manufacturers have developed a variety of mass flow meters to meet the measurement needs of different occasions and media, but their scope of application has certain limitations. Such as precession vortex flowmeter and differential pressure flowmeter to measure mass flow, the fluid operating density must be set in advance or a density measuring instrument must be configured to measure the density, so as to achieve real-time and accurate measurement of mass flow, the structure is complex, the installation and debugging workload is large, Cumbersome; Coriolis mass flowmeter cannot measure the mass flow of high-temperature liquid, high-temperature steam, high-temperature mixed gas with changing composition, and low-pressure gas with changing composition based on its measurement principle, and the purchase cost is high. For foreign brands, the localization rate is extremely low.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a precession vortex differential pressure mass flowmeter, which solves the problems raised by the above background technology.

A precession vortex differential pressure mass flowmeter of the present invention includes a venturi tube and a sensing device, the sensing device is installed on the venturi tube, and instrument flanges are installed at both ends of the venturi tube, and the inner A vortex generator and a de-rotation rectifier are arranged in sequence from the inlet to the outlet, and it is characterized in that the sensing device includes a converter, a differential pressure signal acquisition and processing unit and a piezoelectric sensor that are all electrically connected to it. The differential pressure signal acquisition The processing unit is connected with the venturi tube through an upstream pressure-taking pipe and a downstream pressure-taking pipe, and the upstream pressure-taking pipe is installed in the cylindrical section of the venturi tube, and the downstream pressure-taking pipe is installed in the venturi tube throat; the piezoelectric sensor is mounted on the outlet diffuser section of the venturi through a mounting seat.

Preferably, the differential pressure signal acquisition and processing unit includes a differential pressure transmitter, a three-valve group and a conversion joint.

Preferably, the converter and the piezoelectric sensor are fixedly connected through a support frame.

Compared with the prior art, the beneficial effects of the present invention are:

The flowmeter proposed by the present invention satisfies the accurate measurement of fluid mass flow, and is especially suitable for high-temperature liquid, high-temperature steam, high-temperature mixed gas with changing components, and low-pressure gas with changing components, unstable temperature and pressure, and changes in components entering the factory. Accurate measurement of the mass flow of fluids with large changes in fluid density does not require a separate density measuring instrument or a temperature and pressure compensation device to complete the mass flow measurement, and can accurately measure mass flow, fluid density, differential pressure, frequency, etc. The instrument has high measurement accuracy, stable and reliable work, high degree of integration, compact structure, can display and output various data, and facilitate communication; it is convenient for users to analyze data, improve processes, improve production efficiency, reduce costs, and meet the requirements of energy social management and control .

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of Chinese churi tube of the present invention;

FIG. 3 is a schematic structural diagram of a differential pressure signal acquisition and processing unit in the present invention.

Markings in the drawings: 11—instrument flange, 12—vortex generator, 13—venturi tube, 14—piezoelectric sensor mounting seat, 15—de-rotation rectifier, 2—upstream pressure pipe, 3—downstream pressure pipe , 4—differential pressure signal acquisition and processing unit, 41—differential pressure transmitter, 42—three-valve group, 43—converter, 5—converter, 6—support frame, 7—piezoelectric sensor.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

As shown in Figures 1-3, a precession vortex differential pressure mass flowmeter of the present invention includes a venturi tube 13 and a sensing device, the sensing device is installed on the venturi tube 13, and the venturi tube 13 Instrument flanges 11 are installed at both ends of the tube 13, and a vortex generator 12 and a de-swirl rectifier 15 are arranged in sequence from the inlet to the outlet. Signal acquisition and processing unit 4 and piezoelectric sensor 7, the differential pressure signal acquisition and processing unit 4 is connected to the venturi tube 13 through the upstream pressure-taking pipe 2 and the downstream pressure-taking pipe 3, and the upstream pressure-taking pipe 2 is installed In the cylindrical section of the Venturi tube 13, the downstream pressure taking tube 3 is installed at the throat of the Venturi tube 13; the piezoelectric sensor 7 is installed at the outlet diffusion section of the Venturi tube 13 through a mounting seat .

Preferably, the differential pressure signal acquisition and processing unit 4 includes a differential pressure transmitter 41 , a three-valve group 42 and a conversion joint 43 .

Preferably, the converter 5 and the piezoelectric sensor 7 are fixedly connected through the support frame 6 .

In the flowmeter proposed by the present invention, the differential pressure transmitter 41 and the three-valve group 42 are connected by the valve group mounting screws, the sealing gasket is sealed, the adapter 43 is threadedly connected with the three-valve group, and the adapter 43 is connected with the upstream pressure pipe 2. The downstream pressure taking pipe 3 is welded and connected.

The static pressures P1 and P2 in the upstream pressure taking pipe 2 and the downstream pressure taking pipe 3 are transmitted to the differential pressure transmitter 41 through the conversion joint 43 and the three valve group 42, and the differential pressure transmitter 41 converts the static pressure difference signal of the two into The electrical signal is then transmitted to the converter 5.

The piezoelectric sensor 7 is installed on the diffuser section of the Venturi tube 13 through the piezoelectric sensor mounting seat 14 , collects vortex frequency signals, converts them into electrical signals, and transmits them to the converter 5 .

The support frame 6 is used for installing the converter 5 and simultaneously accommodates the output differential pressure signal cable of the differential pressure signal acquisition and processing unit 4 and the output electrical signal cable of the piezoelectric sensor 7 .

The converter 5 receives the vortex frequency signal of the piezoelectric sensor 7 and the differential pressure signal of the differential pressure signal acquisition and processing unit 4, and performs signal amplification, filtering, shaping, calculation, etc., according to the measurement principle of the precession vortex differential pressure mass flowmeter. Condition volume calculation, operating density calculation, mass flow calculation, cumulative flow calculation, etc., and complete the display of various parameters, signal remote transmission, and communication.

The terms "front," "rear," "left," "right," and similar expressions are used herein for illustrative purposes only.

In the present invention, "first", "second" and "third" do not represent a specific quantity and order, but are only used for the distinction of names.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (3)

1. The precession vortex differential pressure type mass flowmeter comprises a Venturi tube (13) and a sensing device, wherein the sensing device is installed on the Venturi tube (13), instrument flanges (11) are installed at two ends of the Venturi tube (13), and a vortex generating body (12) and a deswirl rectifier (15) are sequentially arranged from an inlet to an outlet inside the Venturi tube (13), the precession vortex differential pressure type mass flowmeter is characterized in that the sensing device comprises a converter (5), a differential pressure signal acquisition processing unit (4) and a piezoelectric sensor (7) which are electrically connected with the converter, the differential pressure signal acquisition processing unit (4) is connected with the Venturi tube (13) through an upstream pressure sampling tube (2) and a downstream pressure sampling tube (3), the upstream pressure sampling tube (2) is installed at a cylindrical section of the Venturi tube (13), and the downstream pressure sampling tube (3) is installed at the throat part of the Venturi tube (13); the piezoelectric sensor (7) is installed at the outlet diffusion section of the Venturi tube (13) through a mounting seat.

2. A precession vortex differential pressure mass flowmeter according to claim 1, characterised in that the differential pressure signal acquisition and processing unit (4) comprises a differential pressure transmitter (41), a three-valve set (42) and a crossover sub (43).

3. A precession vortex differential mass flowmeter according to claim 1, characterised in that the transducer (5) is fixedly connected to the piezoelectric transducer (7) by a support frame (6).

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