How to choose Bitzer and Hanbell screw compressors
How to choose Bitzer and Hanbell screw compressors
Which is better, Bitzer or Hanbell screw compressor? Both are good, Bitzer is better known and slightly more expensive. Hanbell compressors are less well-known, cheap, cost-effective, stable in performance, and slightly louder than Bitzer screw compressors. How to choose Bitzer and Hanbell screw compressors? If the budget is insufficient, choose Hanbell. On the contrary, Bitzer, the two brands of compressors are screw compressors with the best performance at present, which have been tested for a long time in the market.
1. Introduction to the principle of screw compressor
The screw compressor cylinder is equipped with a pair of intermeshing helical male and female rotors, both rotors have several concave teeth, and the two rotate in opposite directions. The gap between the rotors and between the casing and the rotor is only 5 to 10 wires. The main rotor (also known as the male rotor or the convex rotor) is driven by the engine or motor (mostly by the motor), and the other rotor (also known as the male rotor or the convex rotor) Female rotor or female rotor) is driven by the oil film formed by the main rotor through oil injection, or driven by the synchronous gears at the main rotor end and the female rotor end. So there is no metal contact in the drive (theoretically). The length and diameter of the rotor determine the compressor discharge (flow) and discharge pressure. The longer the rotor, the higher the pressure; the larger the rotor diameter, the greater the flow.
The helical rotor grooves are filled with gas as they pass through the suction port. When the rotor rotates, the rotor groove is closed by the casing wall to form a compression chamber. When the rotor groove is closed, the lubricating oil is sprayed into the compression chamber to seal. Cooling and lubrication. When the rotor rotates to compress the lubricant + gas (referred to as the oil-air mixture), the volume of the compression chamber decreases, and the oil-air mixture is compressed to the exhaust port. When the compression chamber passes through the discharge port, the oil-air mixture is discharged from the compressor, completing a suction-compression-discharge process.
Each rotor of the screw machine is supported by an anti-friction bearing, which is fixed by an end cover near the end of the rotating shaft. The intake end is supported by roller bearings, and the exhaust end is supported by a pair of conical rollers, usually the exhaust end bearing to position the rotor, that is, the thrust bearing, which resists the axial thrust, bears the radial load, and Provide the necessary minimum clearance for axial running.
The working cycle can be divided into three processes: suction, compression and exhaust. As the rotor rotates, each pair of intermeshing teeth sequentially completes the same work cycle.
2. The advantages of screw compressors
Screw compressors are the same as piston compressors, both of which are positive displacement compressors. As far as the use effect is concerned, the screw air compressor has the following advantages:
1) High reliability. The screw compressor has few parts and no wearing parts, so it operates reliably and has a long service life. The overhaul interval can reach 40,000-80,000 hours.
2) Easy to operate and maintain. The screw compressor has a high degree of automation, and the operator does not need to undergo long-term professional training, and can realize unattended operation.
3) The power balance is good. The screw compressor has no unbalanced inertial force, the machine can work smoothly at high speed, and can realize no foundation operation. It is especially suitable for mobile compressors, with small size, light weight and small footprint.
4) Strong adaptability. The screw compressor has the characteristics of forced gas transmission, the volume flow is almost not affected by the exhaust pressure, and it can maintain high efficiency in a wide range. It is suitable for various working conditions without any changes to the compressor structure.
The initial investment per unit horsepower is 30% lower for screw compressors than reciprocating heavy duty water-cooled compressors. It is natural that in operation, screw compressors are one of the simplest types of compressors. The use of oil injection to control the compressor discharge temperature is so effective that the compressor load can be varied over a wide range.
3. Comparison of Bitzer and Hanbell screw compressors
1) Bitzer is a German brand, a world-renowned brand with high global recognition, especially in foreign countries. Bitzer has a professional production line in Beijing, mainly serving the Asia-Pacific region.
2) Hanbell was established in Taiwan, China in 1994. Currently, there are three R&D and production plants, one in Shanghai and two in Taiwan. The domestic screw compressor market share is nearly 50%. With its excellent performance and low price, it has also been fully recognized by foreign customers.
In the ice machine industry, large and medium-sized ice machines all choose screw compressors. The price of Hanbell screw compressors is much cheaper than that of Bitzer, and 2/3 of customers choose Hanbell. About 2/3 of the customers for export equipment choose Bitzer screw machines or parallel Bitzer piston machines.
