Talking about the Ventilation System Design of Air Compressor Station Chen Yichen, Hu Xiaojun, Zuo Guihong, Yin Shuang Zhongcai Construction Co., Ltd. 063030 compressed air system consists of air compressor station outdoor compressed air pipe network workshop entrance device and workshop compressed air system. . The air compressor station is an important part of the compressed air system.
Excessive indoor temperature in the air compressor station will cause equipment such as air compressor dryer to trip, which will seriously affect the normal operation of the plant.
The hot children in the air compressor station mainly come from air compressors and dryers. The amount of heat dissipated by the air compressor station dryer and the cooling method of the air compressor.
For air-cooled air compressors, the ventilation system takes away the heat of the motor that is close to the heat. The water-cooled air compressor is less than the motor consumption. 10. In order to keep the temperature of the air compressor station within an acceptable range, this part of the residual heat must be removed through a reasonable ventilation system.
1 When the air balance of the air compressor is compressed, its temperature rises with the compression process. The resulting heat is equivalent to the energy consumed by the motor during air compression.
The total heat generated by the air compressor contributes to the efficiency of the Tmotor motor. The heat released by the screw air compressor unit with the aftercooler is such that, with the heat released by the compressed air, the wood is about 933 of the total heat 933.
The heat dissipation of the water-cooled fuel injection air compressor is about the total heat, and the batch of 8.
Detailed 1 heat balance.
The total amount of heat remaining in the compressed air is the heat generated by the sound insulation cover. The heat generated by the motor needs to be dissipated by the fan airflow. The air discharged from the exhaust duct can be discharged by the air-cooled air compressor. The oil-cooled air compressor 2 is ventilated. Ventilation system of air compressor station The heat in the air compressor station mainly comes from the air compressor, and the negative pressure ventilation system and the positive pressure ventilation system are generally used.
2.1 Negative pressure ventilation system The exhaust fan should be installed on the wall of the air compressor station end, and the air inlet should be installed on the other end wall. The air flow rate should not exceed 4!
Negative pressure ventilation systems are used in domestic engineering. The water-cooled screw air compressor adopts Form 1 ventilation; the air-cooled screw air compressor adopts Form 2 ventilation.
2.2 Positive pressure ventilation system equipment and automation The positive pressure ventilation system is generally used in foreign projects to ensure the positive pressure value and indoor temperature of the air compressor station indoors, to prevent the air compressor from inhaling the air with high dust concentration, resulting in equipment operation failure. Improve the service life of the air compressor and the reliability of the operation of the compressed air system. The water-cooled screw air compressor adopts Form 1 ventilation; the air-cooled mast air compressor adopts Form 2 ventilation.
The air duct taken from the outdoor air should not be too long. The air inlet should be placed in a cool and low position as much as possible to avoid snow cover and should be equipped with rain-proof louver grille and filter to prevent dust and other debris from entering.
3 Calculation of ventilation The total heat generated by the air-cooled air compressor is about 97 and needs to be exhausted through the fan. The water-cooled air compressor also has a constant heat that is discharged from the ventilation system through the compressor sound enclosure.
Under the condition of the air balance of the air compressor station, according to the ventilation scheme, the heat required by the ventilation system for the ventilation required by the air compressor station can be calculated 3; according to the heat balance of the air compressor station, the air compressor station For V=Vl+V2+V3+V4 3, the ventilation in the V4 room required for heat dissipation through the soundproof cover to the air compressor station is also excluded.
For example, there are two sets of equipment in the air compressor station 7,615,0, so that Jia's air-cooled fuel injection screw air compressor, and two sets of supporting equipment. 1 The refrigerating dryer has an electric power of 4.36 kW, and the air compressor station has 5 air exchanges to ensure that the indoor temperature rise is 5. The air compressor station uses positive pressure ventilation to calculate the ventilation capacity of the air compressor station.
According to the data provided, the main heating devices in this air compressor station are air compressors and refrigerating dryers.
The air volume of the air compressor is 1 = 18.9 mVmin = 34 m3h. The cooling air volume of the air compressor is provided by the manufacturer to eliminate the ventilation required to dissipate heat into the air compressor station through the sound insulation cover. The heat that is distributed is about 2.q! =0x2=2.2kW refrigerated dryer emits heat of cj2=4.36kWV3=QAtxCxp Considering 5 times of air exchange, 4 is the air compressor station required for the amount of ventilation to consider 10, the fan air volume is , equipment and automation ultra-thin glass branch conveyor roller design improvement Shao Yujie Luo Glass Beijing International Engineering Co., Ltd. 471000 take and manual take-up requirements.
1 Basic situation How to improve the yield of ultra-thin glass is a difficult task, especially when the ultra-thin glass is transferred from the main production line to the branch line, the glass is more prone to damage and scratches. The reasonable design of the branch line structure can make the glass plate transported to the branch line after the main line is cut and processed in an orderly manner by the robot to automatically take up the stacking and packaging, so as to minimize the damage of the glass.
2 Design requirements The branch conveyor roller is a segment glass conveyor that continuously transports the sliced ​​glass sheets on the main line to different stacking positions for taking the sheets. The ordinary glass branch conveying roller is provided with an air floating table at the end thereof, and manual taking is performed. Ultra-thin glass is more prone to breakage and scratches. In order to reduce man-made damage, the robot is mainly used to automatically take the film online, and an air floating table is still provided as a spare at the end of the branch line.
Since the centering and grasping of the robot's on-line automatic take-up glass are completed on the branch line, also to reduce the damage and not change the follow-up glass trajectory, the movement precision and mechanical performance of the matching branch line conveyor roller can satisfy the robot automatic The requirements for taking the film, while meeting the requirements of manual filming.
3 Design Improvement According to the requirements, on the basis of the previous design, the branch conveyor roller is improved from the following aspects. 3.1 The glass surface of the apron is directly in contact with the apron. The material of the apron is used to improve the ultra-thin glass into a special component, which can make the apron have moderate wear resistance. It is not easy to scratch the glass, and the debris such as broken glass slag is not easy to be embedded in the apron layer, and the apron is clean and smooth. Prevent hard objects from scratching the glass.
3.2 Movement precision of the branch conveyor roller 3.2.1 The structure of the stick combines the experience of the previous roller structure design, adopts advanced welding technology, so the capacity of the selected positive pressure fan is 1=40 000. In addition, in order to ensure the air compressor station is good. Ventilation, air compressor station should be equipped with an exhaust grille.
106mVh=2.53m3s through the air flow rate of the exhaust grille, according to 3ms consideration, the effective area of ​​the exhaust grille meets the special requirements of ultra-thin glass-to-roller, and the designed roller structure has high processing precision and stable operation.
3.2.2 Distribution of the rubber ring and the distance between the rollers The arrangement of the rubber rings has been mostly arranged in a staggered arrangement, and the glass plate has large jitter, which is not suitable for ultra-thin glass. Moreover, the thin glass plate surface is small, and the staggered arrangement of the rubber rings may cause some glass plates to be overhead, and even the glass plate is blocked during transportation. According to the characteristics of ultra-thin glass, after repeated trials, the arrangement of the aprons is changed to a straight line. 1. According to the weight and the force of the glass plate in the length and width range of the ultra-thin glass plate, the distance between the rubber rings is calculated to be 180. When the spacing is 3001, it can meet the smoothness and economicality of glass sheet transportation.
Ordinary vibrating method, ultra-thin glass, apron arrangement 3.2.3 Bearing selection Each bearing is designed to be fitted with a bearing with an adapter sleeve. The axial positioning is easy to adjust, and the radial clearance after bearing wear or new installation can be Fine-tuned by the adapter sleeve and easy to assemble and disassemble. Since the radial runout control is required to be in the range, the initially selected domestic manufacturer's products have been tested and found that the radial runout of the roller is out of the allowable range after the bearing is mounted. After analysis, the reason is that the eccentric range of the sleeve of the domestic bearing is too wide. After testing, it was finally determined to be replaced with a bearing of the same type in Japan, and its radial runout energy was controlled within the required range.
The calculation method of this example is the calculation method of the ventilation volume of the positive pressure ventilation system of the air compressor station at present. In this system, a filter must be installed in front of the positive pressure fan to reduce the amount of dust and other impurities entering the air compressor station, prolong the service life of the air compressor suction filter, and ensure that the machine room is clean.
1 compressed air manual. Atlas Copco China Hong Kong Ltd. Publishing Equipment and Automation
JIANGMEN PRO-TAYLOR REFRIGERATION CO., LTD. , https://www.protaylor.com