Let's see how to operate:
1. Gas consumption
Calculate the actual total gas consumption and service pressure; According to the statistical method of gas consumption equipment, the original gas consumption comparison method and the same industry comparison method can be combined. Special attention must be paid to the accurate use of pressure. For every 1 bar increase in air pressure, the power consumption will increase by 7%. Generally, 10-20% (actual consumption) of allowance shall be added during model selection to prevent leakage and temporarily increase gas consumption points. When the workshop pipeline is too complex or too long, factors such as pressure attenuation shall be considered.
2. Brand selection and consideration
1. The international first-line and second-line brands are relatively well-known, and the products are relatively mature, stable and reliable, but the purchase cost and maintenance cost are relatively rising. The reason is very similar to that when we buy cars.
Domestic compressor enterprises have developed rapidly in recent years, constantly narrowing the technical gap with international first-line brands, and some technological innovations are even ahead of foreign brands. Therefore, if the budget is limited, domestic first-line and second-line brands can be considered, and most of them have a certain cost performance. For example, foreign trade production enterprises suggest to choose international first-line brands, which are familiar and highly recognized by customers. No matter what brand you choose, you must verify whether you have formal production qualification and have a certain scale of production enterprises. It can be verified on the official website of the enterprise and the inquiry website of local market entities. Don't let all kinds of dazzling OEM brands be false, fake and shoddy, and blind your eyes.
At present, there are even many small factories without production licenses in the market. It should be noted that hundreds of domestic compressor brands do not have formal production licenses. Some ultra-low prices are produced by OEM in some factories and then pretending to sell the so-called German, American and American products, which has had a bad impact on the industry. Therefore, when purchasing, please ask the factory to provide a formal production license, which has a number. You can find out by checking the relevant website.
3. Key points of product selection
(1) Stability and reliability
Most enterprises are in the development stage and there are few standby compressors, so stability and reliability are the first key to consider, because compressed air is the basic production equipment. If the gas is stopped suddenly, it is likely to lead to product quality damage, machine shutdown, delayed delivery, rising labor costs and so on.
It is advisable to choose brand products, mature products, standard products of regular manufacturers, or inquire about the performance and reputation of their selective brands in the circle of friends and peers.
(2) Energy saving and power saving
The biggest cost of the compressor is the cost of electricity, accounting for about 80% of the total use cost. If you choose a product with high efficiency, power saving and environmental protection, you can reduce a lot of costs for users. Saving money is making money.
The first is to choose products with formal energy-saving certification. The specific power is the only standard to see whether the compressor is energy-saving. The lower the energy efficiency, the more electricity will be saved. The specific power value of the same level of energy efficiency depends on the specific power value. Enter the product model on the China energy efficiency identification website to query the energy-saving certification grade and specific power of the product. Note that the product model must be consistent with the manufacturer. If you can't find the energy efficiency value of this product model, this machine may be a high-energy consumption product or an informal channel product. Please buy it carefully!
If the normal gas consumption fluctuates greatly, the frequency converter should be selected to reduce the loss of frequent start-up of loading and unloading through constant pressure operation. Choose high-efficiency energy-saving technology products, such as permanent magnet motor, two-stage compression and so on. About gas production. The main purpose of selecting the compressor is to meet the actual gas consumption. At present, quite a few manufacturers have false and high gas standards. Because ordinary users do not have a flowmeter to test the flow, they must pay attention to it when selecting the compressor.
(3) Quality requirements
Considering the requirements of oil content, water content and solid particle content of gas consumption, combined with the production process and gas consumption accuracy, the model shall be selected according to the standard of quality grade of compressed air for general use. The model shall be selected according to the quantitative data standard of air quality. The nominal pressure dew point and oil content of post-treatment equipment on the market may be different from the actual situation. If there are high requirements for air quality, please explain to the supplier and the air quality acceptance will prevail. When the air quality moisture content and pressure dew point are below 3, the adsorption dryer is not recommended. Although the air will dry, the pressure drop and gas loss may increase by more than 10%.
(4) Function and configuration
Different brands of products have different functional configurations, such as remote control, automatic on-off time setting, remote service, etc. According to the configuration of products of the same level, such as compressor host, frequency converter, electrical system, air inlet valve, motor, fan and solenoid valve... Generally, imported brands and well-known brands are preferred. For internal structure and appearance, most people focus on configuration and appearance, but it is best to investigate the same model to see whether it is convenient for maintenance.
4. Maintenance cost
As the compressor, like the automobile, needs regular maintenance and care, it needs to be understood clearly to avoid falling into the trap of buying at a low price and maintaining at a high price. The warranty terms should be clear whether it is limited warranty or no liability warranty. In order to complete the performance, some business personnel often guarantee the host for ten years. Imagine that the design life of the international mainstream compression host is less than 10 years. What is the basis of his warranty? Often untrue things need special attention. When purchasing the complete machine, the supplier must list the maintenance cycle and cost of the machine. Large factories do better. Small and medium-sized factories generally only pay attention to the purchase price, and it is best to list it clearly in black and white.
5. After sales service guarantee ability and reputation of suppliers
Whether the supplier is a direct authorized agent of the manufacturer. Generally, the authorized agents of first-line brands are OK in terms of strength and after-sales service ability. Otherwise, they are likely to be eliminated by the manufacturer.
Considering the distance, due to the unpredictability of equipment failure, the supplier needs to have efficient service response and good service awareness. Even the best service capacity can not quench the thirst of near water. Therefore, the best service guarantee diameter is about 40km, unless there is a standby machine.
Service reputation and reputation. The service concept and actions of suppliers directly affect the service quality. The most direct thing is to look at the behavior, character and reputation of their bosses and executives? It's best to go to the industry circle or circle of friends to learn more about its reputation, service attitude and reputation.
6. Key factor: price
The evaluation of price and value can be compared according to the four quadrant value method:
Is it planned for medium and long-term use or transitional use
Focus on price components or energy efficiency components
Can the purchase price be within their affordability and how much is the difference from their budget?
Compare the price with the brand and model, and you can't compare the real price if you don't wait. As the saying goes, "you can't be fooled by comparing three goods"!
7. Security
The most important point: consider the safety of compressor operation. Compressor is a kind of machine working under pressure, which is accompanied by temperature rise and pressure. Its operation safety should be put in the first place. The State implements a standardized "two license" system for the production of compressors, that is, compressor production license and pressure vessel production license (air storage tank). Therefore, when purchasing compressor products, we should strictly review the "two certificates". Generally, the product quality assurance system of the certified manufacturer is perfect, and there will be no major quality problems. Even if there are some problems, the manufacturer will be responsible for the three guarantees.
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