Design and Optimization of Air Compressor Comprehensive Performance Test Bench

Design and Optimization of Air Compressor Comprehensive Performance Test Bench

Design and Optimization of Air Compressor Comprehensive Performance Test Bench Zhu Xiangzheng, Yu Xiaoming, Qiu Jinyou, Lei Huiyu (Shanghai University of Technology, Energy and Power Engineering, Shanghai 200093) Test of quantity, noise, vibration and other properties. Apply PLC control technology to make the testing process more precise and smarter.

Air compressors are widely used in all aspects of industrial production, especially volumetric air compressors, which are widely used in many industrial fields such as machinery, metallurgy, electronic power, medicine, packaging, chemical, food, mining, textile, transportation and so on.

Air compressors currently do not have a comprehensive performance test system in China. The lack of effective means for the performance test of air compressors affects the development of air compressor technology. Therefore, the research on the performance test of air compressor is of great significance. In this paper, the structural composition and performance characteristics of the air compressor performance test platform are discussed.

1 Performance requirements and structural components of the test system This test is conducted for small variable-capacity air compressors, so that the test bench avoids the cumbersome air compressor water cooling system; the corresponding control and adjustment system can be configured to be automatically adjusted or manually adjusted. And can accurately measure pressure and flow.

11 functional and technical indicators 3853-1998 requirements, the main operation of the suction and discharge pressure of the machine under test and pipeline pressure, flow pressure difference, power, speed, noise, vibration, intake and exhaust temperature and body temperature The parameters are detected and sent to the PLC controller on the unit control cabinet (PLC expands the analog input and output modules). The test system increases the function of collecting and displaying the air compressor dynamometer to facilitate the performance parameters such as the variable compression index n and volumetric efficiency of the air compressor. The system is configured with a security system.

12 test basic items air compressor performance test test bench such as I-motor: 2-empty H press: 3-pressure transfer both 4-temperature transmitter: 5--gas tank: 6-pressure pottery (Micro-purchasing: 7-separator: S-special board: g-rogue nozzle: 10-moisturizing lg:-ME her 12-flf liquid helium 13-absolute pressure transmitter data acquisition card: 15-i ten computer 16-SIS instrument: 17-two-phase three-wire memory power transmitter air compressor performance test test bench indicates the use of absolute pressure transmitter to measure atmospheric pressure, the atmospheric pressure of the test space should be at the center of the air compressor inlet and outlet The average height between the two is determined, and the error should not exceed the direct meter reading and sent to the computer display.

The temperature is measured by a temperature transmitter. The measurement items include the atmospheric temperature of the experimental space, the air compressor cylinder temperature, the exhaust temperature, and the gas temperature upstream of the nozzle. The temperature measurement accuracy is not more than ±1 °C. For two or more test points, each point shall be recorded. After the test, the temperature is averaged and recorded for conversion. See the air compressor exhaust temperature measurement point location and installation requirements.

The pressure transmitter is used to measure the suction and exhaust pressure, the tank pressure and the gas temperature upstream of the nozzle. The pressure taps of pipes and gas tanks should be perpendicular to the inner wall and flush with them. The nozzle should be as short as possible and should be of sufficient diameter and arranged to avoid clogging due to dirt or condensation. The measuring point takes a uniform point on the circular pipe section for pressure measurement. The accuracy of the measuring instrument should be less than ±1%. See the location and installation requirements of the suction and exhaust pressure of the air compressor.

Temperature measurement, pressure measurement point indication (4) nozzle installation requirements and nozzle method to measure flow rate determination of flow methods, there are many methods of orifice plate and nozzle, because the orifice plate method needs to cut the pipe to install the orifice plate process The requirements are higher, and the nozzle method is used here for measurement. The nozzle flow measurement is actually the specific application of the flow measurement device on the air compressor.

See the structure of the nozzle measuring device.

The diameter D of the pipe should be greater than or equal to 4 times the nozzle diameter, but not more than 630mm should not be less than 50mm. The nozzle upstream 4 times the pipe diameter to the nozzle range insulation, but must not affect the nozzle exhaust.

The installation requirements for the temperature measurement point and the pressure measurement point are the same.

Calculation of flow rate: Calculated by the amine volume (1) of the compressor volume flow without accounting for condensed water.

s; C is the nozzle coefficient selected from Table 8 according to the provisions of 0 in GB/T15487-1995; d is the nozzle diameter, m; 匕 is the compressor suction temperature, is the compressor suction pressure, Pa; Nozzle pressure difference, Pa; outside is the atmospheric pressure of the test, Pa; is the gas temperature upstream of the nozzle, K. The speed of the compressor should be measured periodically during the test period of each test point to monitor the error of the average shaft speed. The speed measurement method includes a revolution counter, a direct indication mechanical or electrical tachometer, a photoelectric speedometer or other instrument measurement. The relative error of the measurement should be no more than ±0.2%. The photoelectric speedometer is used here.

There are several methods for measuring the power of the air compressor shaft: 1) The speed and torque of the compressor shaft are directly measured by the speed torque measuring instrument. The relative error of the instrument should be no more than ±1%; 2) The corrected SIDDI 沲 coarse fmmll book Consultation EE, nlllu Di Yi: 葫菡遛 5 鲠湟 sweet 葙窍 舔 > 舔, | 1111 | 湟 湟 芑鄯 芑鄯 A3M. 圃 Bi! 1圃5巯SMSDIaH sugar talks. i knows that S ug sJlr / ia - 吝 very 53 坳矣 31 | 筘. Confused with ugly Xiangdi 贽 茈 湟苒虞罔 湟苒虞罔 湟苒虞罔 湟苒虞罔 ia ia ia ia ia ia ia ia ia ia ia ia ia ia ia ia ia ia 。 Hey, the eggplant is dripping the sensor. In addition, the induction head is mounted on the compressor flywheel, and the proximity signal is used to generate the pulse signal of the bottom dead center of the piston corresponding to the crank angle; the bottom pulse signal is used to control the beginning and end of the data acquisition to achieve the pressure and piston position signals. Synchronization. The computer acquisition board collects these two signals in real time, and after the data processing, the actual power diagram of the compressor can be obtained. A dynamometer for a test procedure.

2 Air compressor performance test procedure and control method This experiment displays and outputs the compressor suction pressure, cylinder temperature, exhaust pressure, exhaust temperature, nozzle pressure and real-time through data acquisition card, sensor component, computer, etc. Parameters such as differential pressure, sound and vibration before and after; real-time measurement and display of the compressor's performance at different pressures, shaft power and dynamometer.

Check the surrounding environment of the experimental sound, whether the compressor is good, the circuit is faulty, and ensure the safety of the experimental operation.

1 Check the 芫 and then turn on the key switch to start the power.

2 Turn on the air switch to turn on the power. Start the computer and call up the air compressor test system display interface.

3 Open the main valve and the exhaust gas regulating valve on the compressor gas storage tank so that both valves are in the fully open position.

4 Turn on the compressor power switch to start the compressor.

Turn on the compressor start switch so that the gauge pressure of the gas tank is at two atmospheres and run for more than 30 minutes. After the pressure and temperature of the outlet are stable, the measurement is started. Each pressure is measured twice. Each time interval is adjusted by manual or computer control to close the main valve. The pressure is basically stabilized at the set value, and the pressure is maintained by the trim valve. After the set value is stabilized, the first set of data is collected and stored.

Repeat the steps described in (4) to begin the acquisition and storage of the next set of data. Repeat the collection of data for each group.

After collecting the data needed for 芫, click “Stop Run” to stop the acquisition.

Turn off the compressor power switch and stop the compressor operation to completely remove the gas in the gas storage tank. Be careful not to pressurize the compressor with pressure to avoid damaging the sound.

Click "Open Save Record", click on the name of the data curve you want to copy, print, record or extract the necessary experimental data. Such as the exhaust temperature, exhaust pressure, displacement, compressor shaft power, compressor speed, etc. of each group.

(9) Exit the data acquisition system and click 'Exit the system, the software is closed.

3 Conclusions 3853-1998 "General purpose volumetric air compressor performance test specification" design.

Accurately test the parameters of the air compressor, including pressure, flow, shaft power, speed and so on. Through the variable capacity operation experiment on the detection platform, important data and improvement directions of compressor energy saving can be obtained.

For the performance test of air compressors, further efforts can be made in the following aspects. (1) The performance test is based on the process control of the PLC system, and the automatic control system needs to be further improved.

(2) Remote testing of air compressors is a new requirement put forward under the situation of rapid development of Internet and computer testing technology.

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