Cooling of Piston Air Compressor Wang Long Wang Changyue An Jiangbo Navy, Department of Mechanical and Electrical Engineering, Welding Bureau, Luan 233012, Anhui Province, and analyzed the control of the cooling water quality and water temperature of water-cooled air compressors.

When the piston air compressor is working, the internal gas is quickly compressed and the temperature rises quickly. In order to reduce the exhaust gas temperature, the air compressor must be cooled. The usual cooling measures are interstage cylinders and post-press cooling, and there is a cooling medium flow in the cooling system to reduce the temperature of the compressed air and air compressor to ensure their normal operation.

1.2 Cooling can maintain the displacement of the cylinder in addition to improving the lubrication effect, but also maintain the normal displacement of the air compressor. In order to prevent the piston from damaging the cylinder due to thermal expansion. The cylinder of the compressor should maintain a fixed volume of more than 7 volumes. After a good exhaust, there is a small amount of gas remaining in the cylinder. The temperature of the remaining gas gas varies. Under normal circumstances 1 The necessity of air compressor cooling 1.1 Cooling can improve the lubrication conditions During the operation of the air compressor, the viscosity of the lubricating oil is easily torn with the temperature of the oil film. Reduces lubrication and causes various accidents. In severe cases, the lubricating oil evaporates the light fractionated oxide under the action of high temperature to form acid asphalt and carbide. These metamorphic materials are easily deposited to form carbon deposits, and oxidize and exotherm under high temperature and high pressure, if the heat is not released in time. Will spontaneously ignite and produce an explosion. The working cycle of the lower air compressor is 1234 1. However, if the cooling effect on the cylinder is poor. The working cycle of the air compressor becomes 1+2. 3 The exhaust temperature rises and the exhaust pressure increases. It can be seen from 1 that under the condition of poor cooling, the expansion process 41 of the air compressor is increased compared with the expansion process 41 under normal conditions, and the suction process is shortened, that is, 121 2. Due to the atmospheric pressure at the suction port It is basically constant, so the inspiratory velocity is unchanged in both processes. Thereby the amount of inhalation is reduced. There is a reduction in discouragement. Maintaining a good cooling of the cylinder overcomes the problem of high exhaust gas temperature and high pressure fire exhaust. , 1.3 cooling can improve efficiency in order to prevent the formation of carbon deposits. In response to the cylinder of the air compressor, the main purpose is to dissipate the frictional heat between the piston and the cylinder. To provide a good working environment for the lubricating oil, usually control the amount of cooling water to maintain the exhaust temperature + more than 200 is appropriate.

Assistant lecturer in the Department of Mechanical and Electrical Engineering of the NCO School, mainly engaged in the teaching and research of mechanical and electronic aspects.

During the work of the crusher. As soon as the compression process is close to the isothermal compression process, the cylinder and interstage cooling must be increased to release the heat generated by the compressed female gas as soon as possible. The enhancement of cylinder cooling makes the multivariate process index reduce the compression process towards an isothermal process. The power consumption of the actual cycle is reduced; at the same time, the temperature of the cylinder wall is also lowered. The heating effect of the cylinder on the inhalation of fresh gas is weakened. The temperature coefficient increases. It can be seen from 1 that when the cooling is strengthened, the intake air temperature is lowered, and the area enclosed by the actual circulation process is made small, so that the power consumption is reduced. Therefore, it is an effective measure to reduce the power consumption of the jade reducer by increasing the amount of cooling water of the cylinder and the cooler; at the same time, the exhaust temperature of each stage can be lowered. The compressor operates safer. The information is clear. The inter-stage cooling temperature can reduce the power consumption of the compressor by 1.3. The cooling is beneficial to the separation of oil and water. The air contains lubricating impurities such as moisture and moisture. The cooling after compression can reduce the temperature of the mixed gas and make the lubricating oil and moisture condense into volume. Large droplets. This mixed gas passes through the oil water separator. It is easy to separate moisture and mist from the air, which can improve the gas quality.

2 Air compressor cooling measures 21 The amount of cooling water and water quality requirements The amount of cooling water is related to the heat generated by compression, the inlet temperature of the cooling water, the heat transfer coefficient of the compressor components, the flow characteristics of the cooler, and the like. When the amount of cooling water is small, the amount of heat taken away is also small, and the cooling effect on the air compressor is poor. However, if the amount of water is too large, the cylinder wall is cooled too fast, and the water vapor in the redundant volume air condenses on the cylinder wall during the expansion process. , bringing hidden dangers to the safe operation of the compressor. Therefore, the amount of cooling water should be supplied with reference to the product manual. In special case 5, more than 131 air compressors can be determined according to experience. The amount of cooling water is 223 water.

The quality of 7-foot is related to the formation of scale. The high-quality cooling water is not easy to generate scale, which is beneficial to the heat transfer between water and air compressor. Inferior cooling water is easy to generate a large amount of water. 1 scale and water and air compressor The heat exchange between. Therefore, the water quality requirements for air-conditioning cooling water are high. Usually performed according to the 1 standard.

Water quality indicators Suspended mechanical impurities Organic oils Salts Temporary 1 Hardness requirements are long. The use of water-cooled muscle water pipes causes rusting, which not only hinders heat transfer, but also rusts through water pipes, causing cooling water to enter the gas pipes and causing serious accidents. Therefore, in the ring of corrosion of the cooling water is strong. It is often treated with zinc blocks and the like.

22 Requirements for inlet water temperature The cooling water temperature and water sample have an important effect on the cooling effect, but the cooling water temperature is not as low as possible. The water temperature should be kept within the proper range. For the intercooler, the internal water temperature should not exceed 40; otherwise It is easy to form scale on the inner wall of the cooler. Therefore, the water temperature at the inlet of the cooler should be kept at 15,20, and the difference between the inlet and outlet water temperatures is preferably 15,20.

For cylinder cooling. When the temperature of the cooling water is too low, the moisture in the air in the cylinder will condense when the compressor expands, which will easily cause water hammer when compressed; the cooling effect of the 7-foot temperature is not obvious. Under normal circumstances, the inlet temperature of the cylinder cooling must be 30 or more.

In combination with the above two cooling modes, the compressor can be mixed and flowed through the intercooler, and the gas in the cooling pipeline flows to the high and low pressure cylinder cooling water jacket and the cylinder respectively. This makes full use of the cooling water without causing hidden dangers to the equipment.

Low-pressure cylinder cooling water jacket high-pressure cylinder cooling water jacket 3 Conclusion The working process of gas in the cavitation machine is 1泯. How to release the heat generated in compression in a timely and effective manner, before raising the air compressor. The cooling technology of domestic air compressors needs to be further researched and developed to ensure the reliable and efficient operation of the press, 1Ij Yu Yongzhang. Volumetric compressor design manual. Beijing Machinery Industry, V.tt.2000 12 Zhu Yufeng. Research on the reciprocating compressor cooling system. Hebei Industrial Division Ii.2007.3 3j Qiu Jun. Li Qiang, Li Juanjuan. Research on Gas Compression Thermal Process of Reciprocating Compressor lJ. Fluid Machine 撇. 200812225

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