Factors Affecting the Price of Screw Air Compressor
The price of the screw air compressor is determined from the material, quality and other factors of the air compressor.
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The main cost of the air compressor comes from the main engine, so some manufacturers choose a small main engine to save costs, but the size of the main engine determines the gas output of the air compressor. If the cost of the main engine is reduced and the size is reduced, how can the gas production be achieved?&#; &#;Adjust the host speed.
The size of the screw is reduced. In order to ensure the gas production of the screw machine, some manufacturers increase the speed to meet the gas consumption standard.
This approach has the following disadvantages:
1. The higher the rotation speed of mechanical products, the more unstable the performance, and the &#;explosion&#; of the host is prone to occur.
2. The temperature rises at high speed, the oil cannot take away the heat in time, and it is prone to irreparable high-temperature shutdown. (The speed of the main engine is increased, and the temperature is adjusted to a critical point, so that the cooler is slightly dirty and causes a high-temperature shutdown, which cannot be repaired)
3. High rotation speed leads to accelerated wear of the screw and shortens the service life.
4. The higher the speed of mechanical equipment, the greater the noise, and the noise is more harmful to the human body.
5. Energy saving (after the speed increases, the required electric energy will definitely increase, and the cost will also increase)
The material of the screw air compressor host affects the price of the host
1. The host adopts forged steel
Forged steel refers to various forgings and forgings produced by forging. The quality of forged steel parts is higher than that of steel castings, and it can withstand large impact forces. The plasticity, toughness and other mechanical properties are also higher than those of steel castings. Therefore, forged steel parts should be used for some important machine parts. The expansion coefficient of the rotor is small, it is not easy to deform, the wear is small, and the leakage is small, so the efficiency is high and the service life is long.
2. The main machine is made of ball-milled cast iron
The carbon in cast iron is precipitated in the form of graphite. If the precipitated graphite is in the form of strips, the cast iron is called gray cast iron or gray cast iron; Or code iron, and cast iron when it is spherical is called ductile cast iron.
In the production process of ductile iron castings, some holes with a diameter of about 0.5-3mm and smooth inner walls in the shape of spherical, oval or pinholes are often found after heat treatment, shot blasting or machining. The distribution of the lower 2-3mm is the so-called subcutaneous stomata.
The formation of subcutaneous pores is due to the high tension on the surface of the magnesium-containing iron liquid, which is easy to form an oxide film, which has a certain effect on hindering the discharge of precipitated gases and intrusive gases. These gases will form pores if they stay subcutaneously. In addition, the mushy solidification characteristics of ductile iron make the gas passages blocked earlier, which will also promote the formation of subcutaneous stomata defects.
Another factor that affects the price of screw air compressors is the air compressor accessories: air filter, oil filter, oil-gas separation core, oil-gas separation system, oil separator core, lubricating oil, etc., when choosing a screw air compressor Don&#;t blindly seek cheapness.
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Which Is Better? &#;Screw Compressor VS Piston Compressor
Screw air compressors and piston air compressors are the two most common models in the air compressor market. Practitioners of air compressors often use these two models as a comparison to advertise and promote to users.
Piston air compressors entered the market early and had a large market share; screw air compressors entered the market late, but with a high degree of intelligence.
However, it is a trend that screw air compressors replace piston air compressors, and it has been steadily proceeding. In the near future, more screw air compressors will be used in industrial production, and the market share of screw air compressors will continue to increase.
Comparison of rotary screw air compressor vs piston selection compressed air has played a vital role in the daily operations of most companies. The demand for compressors is obvious, but which compressor to choose?
The screw-type or the piston type can make it work best in the equipment, which is a question worth discussing. This first needs to consider the similarities and differences between the two compressors before choosing the most suitable one.
Compressors have been widely used in various gas fields, but air compression is the most widely used part. At present, stationary screw air compressors account for approximately 40% of the air compression market share, while piston air compressors account for 21% of the market share (calculated in US dollars).
What is the difference between rotary and piston compressor&#;
Different structure
The organization structure of the screw air compressor consists of the oil screw main engine, electric motor, oil and gas separator, oil pipeline system, cooling system, gas pipeline system, and electrical control system.
The piston compressor is composed of a compressor main unit, cooling system, regulating system, lubrication system, safety valve, electric motor, and control equipment.
Different features
The screw air compressor has the advantages of low vibration, no need to fix on the foundation with anchor bolts, low motor power, low noise, high efficiency, stable exhaust, and no wearing parts.
Under normal circumstances, the compressed gas of the piston compressor does not contain oil, and there is no need to add a degreasing device.
The disadvantage of this machine is that the motor power is too large, the exhaust pressure is not stable enough, the exhaust temperature is high, the noise is too large, the maintenance workload is large, and the maintenance cost is high.
The fault is different
The Benefits of Using a 3D Printing Technology in ManufacturingHow to Choose the Best Fiber Laser Tube Cutting Machine?Screw air compressor failure is very few, just regular maintenance, replacement of air filter, oil filter and oil-gas separator, can be normal operation.
Additional reading:500000 kilometers without overhaul is not the preferred ...
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Due to incomplete oil scraping and poor sealing of piston air compressor, oil often runs to packing device or even piston ring, resulting in oil in compressed gas.
In addition, the exhaust temperature is high, sometimes as high as 200 &#;; the cooling effect is not good due to the blockage of cooling; the piston ring is stained with oil, which is especially easy to wear; the valve flap leaks; the cylinder is worn, etc.
Which is better rotary or piston compressor&#;
4.Performance Comparison:
Piston air compressors have low reliability, many parts, many vulnerable parts, large maintenance, poor operation reliability, short life span, and the interval between overhauls is generally about 8,000 hours.
The screw air compressor has high reliability, few parts, no wearing parts, small maintenance, reliable operation, long life, and the interval between overhauls can reach 40,000 to 80,000 hours.
Piston type has unbalanced inertial force, machine running vibration and noise are big, small machine or above needs to install the foundation.
The screw type has no unbalanced inertial force, the machine can work steadily and at a high speed, is small in size, light in weight, and can achieve basic operation.
The reciprocating air compressor has a discontinuous exhaust, causing airflow pulsation, unstable pressure, and easy to cause pipeline vibration. A large-capacity air tank is required.
The rotary screw air compressor has a uniform exhaust, no airflow pulsation, stable pressure, and no need for large-capacity air tanks.
Reciprocating air compressors have poor air quality and high exhaust oil content, which cannot meet the higher requirements of users, and post-processing costs are high.
The oil-injected screw compressor can also achieve good air quality, and the exhaust oil content is only between 1-5 ppm, which meets the higher requirements of users and reduces post-processing costs.
Price-Piston VS Screw Air Compressor
Piston-type air compressors have low production requirements and low prices. Screw-type air compressors require high production technology, and their prices are more expensive than piston-type air compressors.
Stress Adaptability
Piston air compressors are suitable for a wide range of pressures and can reach the required pressure regardless of the flow rate, up to 350Mpa in industry.
The oil-injected screw air compressor is limited by the rigidity of the rotor and the bearing, so it cannot be used in high-pressure occasions, and the exhaust pressure generally does not exceed 3 Mpa.
Capacity Adaptability
The piston type has strong adaptability and a wide range of displacement, which is not affected by pressure.
Rotary compressors cannot be applied to miniature occasions because they rely on gap sealing gas. Generally, rotary compressors have superior performance only when the volumetric flow is greater than 0.2m3/min.
Operation and Maintenance
The piston air compressor has a low degree of automation and must be operated by someone on duty. The screw air compressor has a high degree of automation. The operator does not need to undergo long professional training and can realize unattended operation.
Conclusion:
Based on the above, if you consider the price, the piston air compressor is the best choice; in order to reduce the maintenance cost and production cost of the air compressor, increase economic benefits, facilitate equipment management, protect the environment and reduce pollution.
And use high-efficiency high-reliability screw compressors to replace piston-type air compressors and the construction of an advanced and economical air compressor station is an inevitable trend of increasing development and strength.
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