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How to choose an air compressor in a reasonable way should comprehensively consider the comprehensive technical and economic indicators such as the investment and operating costs of the air compressor unit and the air compressor station, so that it conforms to the principles of economy, safety and application. Specifically, there are the following aspects:
1.The flow and pressure requirements of the production process must be met, that is, the operating conditions of the air compressor (the intersection of the device characteristic curve and the performance curve of the air compressor) are often kept in the high-efficiency interval, which saves power It is not easy to damage the machine parts.
2. The selected air compressor must be small in size, light in weight, cheap in cost, and have good characteristics and high efficiency.
2.
3. 3. It has good anti-surge performance, stable operation and long service life.
4.
5. 4. The structure is simple, the operation is convenient, and the accessories are easy to purchase.
6.
7. 5. The selected air compressor station has low project investment and low operating cost.
8.
9.The main basis for the selection of air compressors is the working pressure and flow rate of the starting system. The working pressure of the air source should be about 20% higher than the highest working pressure in the pneumatic system, because the loss and partial loss of the gas supply pipeline must be considered. If the working pressure requirements are low in some parts of the system, a pressure reducing valve can be used to supply gas. The rated discharge pressure of the air compressor is divided into low pressure (0.7 ~ 1.0Mpa), medium pressure (1.0 ~ 10MPa), high pressure (10 ~ 100Mpa) and ultra high pressure (above 100Mpa), which can be selected according to actual needs. Common use pressure is generally 0.7 ~ 1.25Mpa.
Air compressor selection steps
Air compressor performance characteristics:
① Air characteristics: local atmospheric pressure, local air relative humidity, etc.
② What is the diameter and content of solid dust particles contained in the air.
③ Air temperature: (℃)
④ Required flow rate (Nm³/min or Nm³/h)
A. Flow rate, domestic users often call displacement. Flow rate refers to the amount of gas discharged from the air-air compressor per unit time at the required discharge pressure, converted to the amount of intake air.
B. The flow unit is: m³/min (cubic meter/minute) or L/min (liter/minute), 1m³ (cubic meter)=1000L (liter);
C, general, the commonly used flow unit is: m³/min (cubic meter/minute);
D, flow rate is also known as exhaust volume or nameplate flow rate.
E, pressure: design pressure, maximum working pressure, working pressure.
There are many forms of pressure units. Here we mainly introduce the pressure units commonly used in centrifugal air compressors;
①Working pressure is often referred to as exhaust pressure by domestic users. Working pressure refers to the highest pressure of air discharged from the air compressor;
② Commonly used working pressure unit is: bar or MPa, 1bar=0.1MPa;
③Generally, users usually call the pressure unit: kg/㎡, 1bar=1kg/㎡.
F. Pipeline system data (pipe diameter, length, type and number of pipe accessories, etc.).
When designing and arranging pipes, the following matters should be noted:
① Reasonably select the pipe diameter. The diameter of the pipeline is large. At the same flow rate, the air speed is small, and the resistance loss is small, but the price is high. The small diameter of the pipeline will cause the resistance loss to increase sharply, increasing the power of the selected air compressor, and increasing the cost and operating cost. Therefore, it should be considered from the technical and economic perspectives.
② The maximum pressure that can be withstood should be considered at the air supply pipeline and its pipe joints.
③ The pipeline should be arranged as straight as possible, minimize the accessories in the pipeline and minimize the length of the pipeline. When turning, the bend radius of the elbow should be 3 to 5 times the diameter of the pipeline, and the angle should be greater than 90℃ .
④ Air compressor must be equipped with air supply valve and check valve at the rising pipe. The valve is used to control the working point of the air compressor. The check valve prevents the air compressor from reversing when the pipeline pressure is higher than the air compressor outlet after the air pressure suddenly increases suddenly to prevent damage to the impeller and the motor.
Air compressor parameters
parameter is an important index of screw air compressor, but many people are not clear about it. Today, I will take you to understand the parameters of the screw air compressor.
Under normal circumstances, the parameters of the screw air compressor are mainly composed of the following points:
1. Power (KW)
Power refers to how much work an object does in a unit of time, that is, power is a physical quantity that describes the speed of doing work. Usually this value is marked on the machine nameplate.
2. Exhaust volume (m/min)
Displacement refers to the volume of air discharged by the screw air compressor per unit time, converted to the state of suction.
3. Exhaust pressure (Mpa)
Exhaust pressure refers to the pressure of refrigerant gas in the exhaust pipe at the outlet of the air compressor, that is, the air pressure (pressure) discharged from the last stage of the air compressor, usually in Mpa, which is "megapascal" as the unit.
In addition to the above parameters, the screw air compressor also has noise dB (A), outlet diameter, external dimensions (mm), weight (kg), oil consumption (L), etc. These parameters are different for each manufacturer Yes, enterprises can choose according to their actual needs when choosing.
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How to choose an air compressor in a reasonable way should comprehensively consider the comprehensive technical and economic indicators such as the investment and operating costs of the air compressor unit and the air compressor station, so that it conforms to the principles of economy, safety and application. Specifically, there are the following aspects:
1.The flow and pressure requirements of the production process must be met, that is, the operating conditions of the air compressor (the intersection of the device characteristic curve and the performance curve of the air compressor) are often kept in the high-efficiency interval, which saves power It is not easy to damage the machine parts.
2. The selected air compressor must be small in size, light in weight, cheap in cost, and have good characteristics and high efficiency.
2.
3. 3. It has good anti-surge performance, stable operation and long service life.
4.
5. 4. The structure is simple, the operation is convenient, and the accessories are easy to purchase.
6.
7. 5. The selected air compressor station has low project investment and low operating cost.
8.
9.The main basis for the selection of air compressors is the working pressure and flow rate of the starting system. The working pressure of the air source should be about 20% higher than the highest working pressure in the pneumatic system, because the loss and partial loss of the gas supply pipeline must be considered. If the working pressure requirements are low in some parts of the system, a pressure reducing valve can be used to supply gas. The rated discharge pressure of the air compressor is divided into low pressure (0.7 ~ 1.0Mpa), medium pressure (1.0 ~ 10MPa), high pressure (10 ~ 100Mpa) and ultra high pressure (above 100Mpa), which can be selected according to actual needs. Common use pressure is generally 0.7 ~ 1.25Mpa.
Air compressor selection steps
Air compressor performance characteristics:
① Air characteristics: local atmospheric pressure, local air relative humidity, etc.
② What is the diameter and content of solid dust particles contained in the air.
③ Air temperature: (℃)
④ Required flow rate (Nm³/min or Nm³/h)
A. Flow rate, domestic users often call displacement. Flow rate refers to the amount of gas discharged from the air-air compressor per unit time at the required discharge pressure, converted to the amount of intake air.
B. The flow unit is: m³/min (cubic meter/minute) or L/min (liter/minute), 1m³ (cubic meter)=1000L (liter);
C, general, the commonly used flow unit is: m³/min (cubic meter/minute);
D, flow rate is also known as exhaust volume or nameplate flow rate.
E, pressure: design pressure, maximum working pressure, working pressure.
There are many forms of pressure units. Here we mainly introduce the pressure units commonly used in centrifugal air compressors;
①Working pressure is often referred to as exhaust pressure by domestic users. Working pressure refers to the highest pressure of air discharged from the air compressor;
② Commonly used working pressure unit is: bar or MPa, 1bar=0.1MPa;
③Generally, users usually call the pressure unit: kg/㎡, 1bar=1kg/㎡.
F. Pipeline system data (pipe diameter, length, type and number of pipe accessories, etc.).
When designing and arranging pipes, the following matters should be noted:
① Reasonably select the pipe diameter. The diameter of the pipeline is large. At the same flow rate, the air speed is small, and the resistance loss is small, but the price is high. The small diameter of the pipeline will cause the resistance loss to increase sharply, increasing the power of the selected air compressor, and increasing the cost and operating cost. Therefore, it should be considered from the technical and economic perspectives.
② The maximum pressure that can be withstood should be considered at the air supply pipeline and its pipe joints.
③ The pipeline should be arranged as straight as possible, minimize the accessories in the pipeline and minimize the length of the pipeline. When turning, the bend radius of the elbow should be 3 to 5 times the diameter of the pipeline, and the angle should be greater than 90℃ .
④ Air compressor must be equipped with air supply valve and check valve at the rising pipe. The valve is used to control the working point of the air compressor. The check valve prevents the air compressor from reversing when the pipeline pressure is higher than the air compressor outlet after the air pressure suddenly increases suddenly to prevent damage to the impeller and the motor.
Air compressor parameters
parameter is an important index of screw air compressor, but many people are not clear about it. Today, I will take you to understand the parameters of the screw air compressor.
Under normal circumstances, the parameters of the screw air compressor are mainly composed of the following points:
1. Power (KW)
Power refers to how much work an object does in a unit of time, that is, power is a physical quantity that describes the speed of doing work. Usually this value is marked on the machine nameplate.
2. Exhaust volume (m/min)
Displacement refers to the volume of air discharged by the screw air compressor per unit time, converted to the state of suction.
3. Exhaust pressure (Mpa)
Exhaust pressure refers to the pressure of refrigerant gas in the exhaust pipe at the outlet of the air compressor, that is, the air pressure (pressure) discharged from the last stage of the air compressor, usually in Mpa, which is "megapascal" as the unit.
In addition to the above parameters, the screw air compressor also has noise dB (A), outlet diameter, external dimensions (mm), weight (kg), oil consumption (L), etc. These parameters are different for each manufacturer Yes, enterprises can choose according to their actual needs when choosing.Subscribe to relevant news content?
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