Intelligent online flow calibrating device

Abstract

A combined vacuum power gas source system is composed of a gas ring type vacuum pump, an oil-free dry type vacuum pump, a flow regulating valve and a connecting pipe section which are connected in parallel, a plurality of groups of sonic nozzles with throat diameters gradually increased in an equal difference mode are evenly distributed in a horizontal stagnation container, and a stable flow field is formed by combining a corrugated pipe expansion joint. The detection pipeline system is coaxially connected with a detected meter through a pipe section support fixing straight pipe section, the meter clamping device clamps the detected meter, the automatic detection system collects stagnation pressure and temperature data in real time, flow error analysis and report generation are achieved through a notebook computer database, and the wide-range stable gas supply device has the advantages that wide-range stable gas supply is achieved; the back pressure ratio can be accurately controlled to be 0.5-0.75, and automatic switching of multiple flow points is supported; the device can complete online calibration of the gas flowmeter under the condition that production is not affected, and is suitable for flow metering verification requirements under complex working conditions in industries such as petroleum and chemical engineering.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of industrial test, specifically is a high accuracy, high stability intelligent online flow calibration device. BACKGROUND

[0002] Online flow calibration device is widely used in petroleum, chemical industry, electric power, water treatment and other industries, is used for measuring the flow of liquid, gas and steam. With the development of industrial automation and intelligentization, the accuracy, stability and intelligentization of online flow calibration device are required more and more. The existing online flow calibration device has problems such as insufficient accuracy and poor anti-interference ability under some complex working conditions, so an intelligent online flow calibration device for flow measurement under complex working conditions, real-time monitoring and calibration of the accuracy of online flow measuring instrument, and realizing remote monitoring, data analysis and fault diagnosis function is needed. UTILITY MODEL CONTENT

[0003] To solve the above problems, the utility model discloses an intelligent online flow calibration device.

[0004] The specific technical scheme is as follows:

[0005] An intelligent online flow calibration device, comprising:

[0006] Combination vacuum power gas source system, standard flow constant system, calibration pipeline system and automatic detection system;

[0007] The combination vacuum power gas source system includes gas ring type vacuum pump, oil-free dry vacuum pump, vacuum pump switch valve, flow regulating valve, air compressor and connecting pipe section, is used to generate the vacuum degree and gas flow power required for device work, and matches the critical flow of system flow and sonic nozzle group through dynamic adjustment;

[0008] The standard flow constant system includes stagnation container, sonic nozzle, nozzle switch valve, compensation node and collection container, the sonic nozzle is installed in stagnation container, and the critical flow state is formed through nozzle throat to stabilize gas mass flow;

[0009] The calibration pipeline system includes clamp meter, detected meter, straight pipe section and pipe section support, is used for online clamping detected meter and adjusting its coaxial with straight pipe section to eliminate uneven flow field distribution;

[0010] The automatic detection system includes PLC calibration cabinet, frequency conversion starting cabinet and notebook computer system, is used for automatic control detection process, data acquisition and processing and generates calibration report.

[0011] The gas ring vacuum pump and the oil-free dry vacuum pump are installed in parallel at the upstream of the connecting pipe section, the flow regulating valve is installed in the middle of the manifold of the connecting pipe section, and the outlet is communicated with the atmosphere, and the flow is dynamically adjusted through the opening degree of the valve core.

[0012] In the standard flow constant system, the stagnation container is a horizontal large space structure, a plurality of sonic nozzles are installed in the interior, and the on-off is remotely controlled through the nozzle switch valve to select the test flow; the collection container is fixedly connected with the stagnation container through the connecting support.

[0013] In the calibration pipeline system, the clamp meter, the meter to be detected and the straight pipe section are installed on the workbench, the workbench is fixed on the pry seat through bolts, and the pipe section support supports the straight pipe section and is coaxially connected with the meter to be detected.

[0014] In the automatic detection system, the frequency conversion starting cabinet controls the motor rotating speed of the gas ring vacuum pump and the oil-free dry vacuum pump through PID adjustment, and accurately controls the vacuum flow and pressure; the PLC calibration cabinet collects the stagnation pressure and temperature signals in real time, and communicates with the notebook computer system to calculate the standard flow and the value error of the meter to be detected.

[0015] The full load flow range of the gas ring vacuum pump is 200-1000 m³ / h, and the critical back pressure ratio is not greater than 0.75; the full load flow range of the oil-free dry vacuum pump is 1-200 m³ / h, and the critical back pressure ratio is not greater than 0.5.

[0016] The high-precision device for calibrating the gas flowmeter in real time in the industrial field or production process can meet the flow measurement demand under complex working conditions without affecting production, can realize real-time monitoring and calibration of the accuracy of online flow measuring instruments, and can realize remote monitoring, data analysis and fault diagnosis and the like.

[0017] The combined vacuum power gas source system provides stable vacuum environment and gas flow power, dynamically adjusts the system flow, matches the critical flow of the sonic nozzle group, and ensures the stability of the device and the measurement accuracy.

[0018] The large-space stagnation container structure is light, beautiful and flexible to disassemble and maintain, and has relatively small land occupation.

[0019] The calibration pipeline system can effectively eliminate the uneven distribution of the internal flow field of the meter to be detected, cause flow velocity distribution distortion or local vortex, ensure that the gas flowing through the meter to be detected is consistent with the standard flow field generated by the sonic nozzle, and improve the flow field stability.

[0020] The automatic detection system has a sound velocity nozzle basic database, and the storage device is equipped with the number, flow discharge coefficient and other calibration parameters of each sound velocity nozzle, so as to automatically trace and judge the calibration data change value. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of the utility model;

[0022] Figure 2 It is Figure 1 a top view;

[0023] Figure 3 It is Figure 1 a left view;

[0024] Figure 4 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] An intelligent online flow calibration device comprises:

[0027] A combined vacuum power gas source system, a standard flow constant system, a calibration pipeline system and an automatic detection system;

[0028] The combined vacuum power gas source system comprises air ring type vacuum pumps 1, oil-free dry vacuum pumps 2, vacuum pump switch valves 10, flow regulating valves 11, air compressors 17 and connecting pipe sections 22, wherein two groups of air ring type vacuum pumps 1 and oil-free dry vacuum pumps 2 are installed in parallel at the upstream of the connecting pipe section 22, the flow regulating valve 11 is installed in the middle of the manifold of the connecting pipe section 22 and the outlet is communicated with the atmosphere;

[0029] The standard flow constant system comprises stagnation containers 6, sound velocity nozzles 5, nozzle switch valves 7, compensation sections 8 and collection containers 9, the sound velocity nozzles 5 are fixedly installed inside the stagnation containers 6, the collection containers 9 are connected with the stagnation containers 6 through connecting supports 3, a plurality of sound velocity nozzles 5 are arranged inside the stagnation containers 6, the sound velocity nozzles 5 are sequentially connected with the nozzle switch valves 7, the compensation sections 8 and the collection containers 9 in sequence downstream to form a channel;

[0030] The detection pipeline system comprises a clamp meter 12, a meter to be detected 14, a straight pipe section 15 and a pipe section support 16, wherein the clamp meter 12 and the meter to be detected 14 are installed on a workbench 13, the workbench 13 is fixed to a pry seat 19 by bolts, the pipe section support 16 supports the straight pipe section 15 and is fixed to the pry seat 19 by bolts, and the straight pipe section 15 is coaxially connected with the meter to be detected 14;

[0031] The automatic detection system comprises a PLC detection cabinet 18, a variable frequency starting cabinet 20 and a notebook computer system 21, the variable frequency starting cabinet 20 is electrically connected with motors of the gas ring type vacuum pump and the oil-free dry vacuum pump 2, the PLC detection cabinet 18 is signal connected with pressure sensors and temperature sensors in the stagnation container 6 through a distributed IO template, and the notebook computer system 21 is in communication connection with the PLC detection cabinet 18.

[0032] The stagnation container 6 is a horizontal cylindrical structure, an annular flow guide plate is arranged in the interior, and the sonic nozzles 5 are uniformly distributed in an array form on the top of the container, and the nozzle axes are perpendicular to the container axis.

[0033] The combined vacuum power gas source system, the standard flow constant system, the detection pipeline system and the automatic detection system are all integrated on the pry seat 19, and the systems are connected through quick couplings and standard flanges.

[0034] The working principle of the utility model is that the meter to be detected 14 is fixed on the workbench 13 through the clamp meter 12, the center height of the meter to be detected is manually adjusted to be coaxial with the straight pipe section 15, the sealing property of all flanges is checked, the notebook computer system 21 loads KingView configuration software, communication connection with the PLC detection cabinet 18 is established, then the variable frequency starting cabinet 20 starts the gas ring type vacuum pump 1 and the oil-free dry vacuum pump 2 according to a preset program, the vacuum pump switch valve 10 is synchronously opened, air in the system is extracted through the connecting pipe section 22, the flow regulating valve 11 automatically adjusts the opening degree according to a preset back pressure ratio, the critical flow requirement of the sonic nozzles 5 is dynamically matched, the automatic detection system selects corresponding sonic nozzles 5 groups through PLC control nozzle switch valves 7 according to a detection flow range, gas enters the stagnation container 6 through the straight pipe section 15, and a critical flow state is formed at the throat of the sonic nozzle;

[0035] In the process of device verification, stable airflow through the table 14, straight pipe section 15 into the stagnation container 6, the table output signal and standard flow data synchronization acquisition, notebook system automatically calculates the indication error and repeatability, frequency start cabinet 20 using PID algorithm dynamic adjustment of the speed of the vacuum pump, maintain the back pressure ratio stable in the range of 0.5-0.75; according to the size of the required flow, automatic detection system can be through the automatic selection control nozzle switch valve 7 open, different specifications of the combination of the speed nozzle 5, to determine the required verification flow. In stable working conditions, the gas mass flow through the speed nozzle 5 and the table 14 is the same. In the process of verification, PLC verification cabinet 18 and notebook computer system 21 automatic acquisition, processing of critical flow before the nozzle stagnation pressure and stagnation temperature, analysis and calculation of the standard gas mass flow or cumulative flow, and according to the relevant verification procedures, with the acquisition of the table 14 of the indication value comparison and calculation, can get the table 14 in different flow point of the indication error and repeatability, automatically generate report, so as to realize the table 14 of the verification.

Claims

1. An intelligent online flow proving device, characterized in that, The utility model relates to a kind of standard flow constant system, verification pipeline system and automatic detection system comprising combination vacuum power gas source system. The combination vacuum power gas source system includes air ring vacuum pump (1), oil-free dry vacuum pump (2), vacuum pump switch valve (10), flow regulating valve (11), air compressor (17) and connecting pipe section (22), wherein two groups of air ring vacuum pump (1) and oil-free dry vacuum pump (2) are installed in parallel in the upstream of connecting pipe section (22), and flow regulating valve (11) is installed in the middle of the manifold of connecting pipe section (22) and the outlet is communicated with atmosphere. The standard flow constant system includes stagnation container (6), sonic nozzle (5), nozzle switch valve (7), compensation section (8) and collection container (9), the sonic nozzle (5) is fixedly installed inside stagnation container (6), the collection container (9) is connected with stagnation container (6) up and down through connecting bracket (3), a plurality of sonic nozzles (5) are provided inside stagnation container (6), and the downstream of sonic nozzle (5) is sequentially connected with nozzle switch valve (7), compensation section (8) and collection container (9) to form a channel. The verification pipeline system includes clamp meter (12), meter (14), straight pipe section (15) and pipe section support (16), wherein clamp meter (12) and meter (14) are installed on workbench (13), workbench (13) is fixed on pry seat (19) by bolt, pipe section support (16) supports straight pipe section (15) and is fixed with pry seat (19) by bolt, and straight pipe section (15) is coaxially connected with meter (14). The automatic detection system includes PLC verification cabinet (18), variable frequency starting cabinet (20) and notebook computer system (21), the motor of air ring vacuum pump (1) and oil-free dry vacuum pump (2) is electrically connected with variable frequency starting cabinet (20), the signal of pressure sensor and temperature sensor in stagnation container (6) is connected with PLC verification cabinet (18) through distributed IO template, and notebook computer system (21) is connected with PLC verification cabinet (18) in communication. The stagnation container (6) is horizontal cylindrical structure, and annular guide vane is arranged inside, and sonic nozzle (5) is evenly distributed in array form on the top of the container, and nozzle axis and container axis are perpendicular to intersect.

2. The smart online flow calibration device of claim 1, wherein: The combination vacuum power gas source system, standard flow constant system, verification pipeline system and automatic detection system are integrated on pry seat (19), and each system is connected through quick connector and standard flange.

3. The smart online flow calibration device of claim 1, wherein: ​

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