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Electric automatic control system for full-automatic supersonic nozzle high-flow standard devices

A technology of electrical automatic control and sonic nozzle, applied in the direction of electrical program control, comprehensive factory control, comprehensive factory control, etc., can solve the problems of high cost, achieve the effects of strong debugging and simulation, high program reliability and convenient maintenance

Inactive Publication Date: 2014-12-17
NINGXIA JIAXIANG AUTOMATIC CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the control part of the large-flow sonic nozzle standard device in the domestic market is composed of a computer system based on an industrial computer. This system not only costs a lot, but also has many inconveniences in composition, use and maintenance.

Method used

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  • Electric automatic control system for full-automatic supersonic nozzle high-flow standard devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 For the composition and function of a fully automatic sonic nozzle large-flow standard device, see figure 1

[0022] The electrical automatic control system of the full-automatic sonic nozzle standard device consists of two parts: detection and control, of which the detection part is the vacuum pump regulating valve 1, the sonic nozzle control component 2, the flow regulating valve 3, the standard turbine flowmeter 4, and the differential pressure transmitter in the working section 5, temperature transmitter 6, the realization of the control part is mainly composed of PLC programmable controller 7, PC 8, PROFIBUS-DP bus 9, RS-23210 bus, RS48511 bus, monitoring software 11 and so on. The vacuum pump regulating valve 1 is used to control the jet air of the vacuum pump. The sonic nozzle assembly 2 includes 8 adjustable pneumatic valves 2-1, 1 temperature sensor 2-2, 1 pressure sensor 2-3, and 1 precision pressure gauge 2-4, which are used to control the jet a...

Embodiment 2

[0023] Embodiment 2 Working process of a fully automatic sonic nozzle large flow standard device

[0024] When the device starts to work, turn on the vacuum pump, and at the same time, the operator inputs the flow value of the meter to be measured into the host computer, and at this time, the PLC automatically opens the corresponding nozzle switch valve according to the input measurement value. Then the vacuum pump sucks the air from the inlet of the upstream straight pipe section of the meter under test, flows through the test pipe section and the flowmeter under test, enters the air storage tank, and flows through a certain combination of critical flow Venturi nozzles for buffering. When the gas device enters a stable state and the pressure before and after the nozzle reaches the critical pressure ratio, start collecting data and record it in the CPU. At the end of the test, the standard cumulative flow is calculated, and compared and calculated with the collected indicate...

Embodiment 3

[0025] Embodiment 3 Realization of control function

[0026] Data acquisition includes digital and analog acquisition: when the system enters a stable critical flow state, data acquisition can be performed by controlling the PLC system. In the gas standard device, the data is mainly collected in three channels, one of which is the analog measurement of the pressure and temperature of the gas storage tank and the meter to be tested. This data requires high real-time performance and high precision, so the PROFIBUS-DP bus and On-site temperature and pressure transmitters transmit data directly, so that the accuracy and real-time performance of the data can be guaranteed. Another channel of analog data is the pressure in the buffer tank and the meter value of the measured meter. This set of data does not require high precision, so it can be collected and converted through the analog input module AI of the PLC. The third channel of data is the digital signal of each switching va...

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Abstract

The invention relates to an electric automatic control system for 3500m<3> / h high-flow sonic nozzle standard devices. The electric automatic control system comprises a vacuum pump regulating valve 1, a sonic nozzle control assembly 2, a flow regulating valve 3, a standard turbine flow meter 4, a working-section differential pressure transmitter 5, a temperature transmitter 6, a PLC (programmable logic controller) 7, a PC (personal computer) 8, a PROFIBUS-DP (process field bus-decentralized periphery) bus 9, an RS-23210 bus, an RS48511 bus, monitoring software 11 and the like. The sonic nozzle control assembly 2 comprises regulating pneumatic valves 2-1, a temperature sensor 2-2, a pressure sensor 2-3 and a precision pressure gauge 2-4. The electric automatic control system is characterized in that the devices can run in critical flow states under the accurate control of the control system, and the electric automatic control system is a PID (proportion, integration and differentiation) arithmetic system which comprises the pressure transmitter, vacuum pumps and the PLC. The electric automatic control system has the advantages of high program reliability, debugging and simulation performance and standardization and convenience in maintenance.

Description

Technical field [0001] The invention involves an automatic control system for a full automatic speed nozzle large flow standard device, especially a 3500M 3 / H The electrical automatic control system of the standard device of the large flow speed nozzle is the technology field of electrical automatic control system. Background technique [0002] Gas flow standard device is a necessary measuring test equipment for detecting the gas flow instrument.Because the sound speed of the Wenqili nozzle has the advantages of simple structure, small volume, stable performance, good repetitiveness, and high accuracy, it is used as a standard for transmission of gas flow and has been widely used at home and abroad.In some devices, the data collection and control functions are generally completed by the computer system composed of industrial control machines, photoelectric isolation cards, frequency transmission cards, switching card blocks, signal conditioning modules, etc.At present, the contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 郭志年
Owner NINGXIA JIAXIANG AUTOMATIC CONTROL TECH
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