Everyone says that the core component of the screw air compressor is the screw head. It should be said that if the screw head is selected, you are half done?
Because the main parameter that affects the performance of the screw air compressor is the machine head, the rest of the connection methods, three filter options, machine layout, etc. can only be relegated to the second line, so what is the current domestic use of the air end? Let’s make one, Analysis of the application, performance and occupancy rate of various domestic brands of screw air ends (excluding AC, IR, LU, FS).
1. Mainstream high-end. The main ones seen in China are Ai Zheng, GHH, TMC, and Rodcom.
Ai Zheng is genuinely imported from Germany (only sold by trading companies in China, but not produced in China).
GHH has been put into production in Jiangsu since 2009. At first, it mainly made some small oil-injected screws, within 10 cubic meters. Later, the foreign production lines were slowly moved to China. So now GHH's oil-injected screws are mainly produced in Wujiang, Jiangsu (oil-free double The screw can only be produced in Germany at present), the price is slightly higher than that of Ai Zheng, but it is the first to be promoted in China, and it is the standard application of domestic high-end air compressor brands. Among them, GHH is due to domestic production and Ingersoll Rand’s technology and brand protection. (GHH is a wholly-owned subsidiary of IR), the price/performance ratio is not as good as Ai Zheng.
TMC is an Italian company, which mainly produces fans and screw heads. The ones seen in China are imported with original packaging. Some models are quite successful.
Rodekamp entered China relatively early, but due to the relatively short product line, it is mainly concentrated on the production of 3 or 6 cubic monolithic heads (oil, oil filter, and air filter are concentrated on one main machine head), although the use situation is very good , But the market is shrinking due to cost-effective reasons.
2, mid-to-high end. Hanbell and Nankou main engines are selected by mid-to-high-end air compressor manufacturers. Among them, Nankou main engines are 132 or above with better performance. As an enterprise with Fusheng as its parent body (most employees are old Fusheng employees), Hanzhong has taken a completely different path from Fusheng. Their technological updates, product control, and prices completely overwhelm Fusheng. At present, it is working closely with the leading domestic compressor company Red Five Rings, which has further improved both in sales and product technology.
3, low-end air end. It is mainly produced by EU, etc., produced by Taiwan Fusheng, and adopted by Esens. Compared with Hanzhong, although the EU head is also made by Taiwan compatriots, it is a standard version of Fusheng, and its performance is definitely not as good as that of Taiwanese compatriots. Fusheng air end.
4. Low-end mainstream. It is mainly based on Bowes, and currently the largest sales volume in the industry is the Bowes air end. Due to its stable performance and low price, Bose main engine is more and more popular with low-end air compressor brands. The fatal disadvantage is low exhaust capacity, that is, low efficiency. According to the actual effect, the Bose main engine, taking 10 cubic meters as an example, can reach 8 at most, while the Han clock can reach 9.5.
5. Low-end air end. It is represented by Wuyang Saidwalker. The Wuyangside rotor and casing are produced and assembled by itself, with the smallest diameter of the rotor. There are some other brands, I haven't heard of them very much, they should not be much better, so I won't introduce them.
At present, most of the air compressor manufacturers on the market use Hanbell and Bowes air end. The main comparisons are as follows:
| Hanbell Air End | Baosi Air End |
Quality | Advanced production equipment, technology imported from Germany. As a high-tech enterprise, Hanbell's research and development expenses have exceeded 100 million since the statistics.
Some important parts of the air end are made of high-performance materials. The rotor has a small expansion coefficient, is not easy to be deformed, has less wear, and has less leakage, so it has high efficiency and long service life. | Due to poor material and high expansion coefficient, the screw of the air compressor is forced to have a large gap and fast wear, resulting in compression backflow |
Market share | 35% | 20% |
Market positioning | The market positioning is mid-to-high-end, and is selected by mid-to-high-end air compressor manufacturers.
It has a low noise and low ibration, more energy saving and efficiency. | Low-end mainstream: Due to its low price, Baosi air end is becoming more and more popular with low-end air compressor brands. The fatal disadvantage is low displacement, which is low efficiency. For example, Xinlei, Desran, and Kangkeer, most of which are used Baosi air end. According to the actual effect, taking 10 cubic meters as an example, it can reach 8 at most, while the Hanbell can reach 9.5. |
Reputation | The machine has a low failure rate, a low repair rate, and a good reputation. | The machine has a higher failure rate and a higher repair rate. The reputation is not as good as Hanbell, but the price is cheaper. |
The material of the main machine of the screw air compressor affects the price of the main machine
1. The air end adopts forged steel
Forged steel refers to various forging materials and forgings produced by forging methods. The quality of forged steel parts is higher than that of steel castings, and 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 all important machine parts. The expansion coefficient of the rotor is small, it is not easy to be deformed, the wear is small, and the leakage is small, so the efficiency is high and the service life is long.
2. The air end adopts 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 flakes, the cast iron is called gray cast iron or gray cast iron, the cast iron in the form of worms is called vermicular cast iron, and the cast iron in the form of flocs is called white cast iron. Or code iron, and the cast iron when it is spherical is called nodular cast iron.
In the production process of ductile iron parts, after heat treatment, shot blasting or machining, some holes with a diameter of about 0.5-3mm and a spherical, elliptical or pinhole-like inner wall are often found. These holes are generally in the surface of the casting. Distributed under 2-3mm, this is the so-called subcutaneous stomata.
The formation of subcutaneous pores is due to the high surface tension 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 gas and invading gas. These gases will form pores if they stay under the skin. In addition, the paste-like solidification characteristic of ductile iron causes the gas passage to be blocked earlier, which also promotes the formation of subcutaneous pore defects.
In addition, the factors that affect the price of screw air compressors are the air compressor accessories: air filter, oil filter, oil and gas separation core, oil and gas separation system, oil separation core, lubricating oil, etc., when choosing a screw air compressor You can't blindly covet cheap, as the old saying goes: cheap is not good.
