Overview of terminologies and terms related to air compressors
Air compressors, as important equipment in the industrial field, cover a wide range of professional terms and terminology. In order to contribute to a better understanding and application of these common terms and terms, these are explained in detail. From the basic “air compressor” to the complex “silver compressor”, each term carries a wealth of expertise. This paper will enable you to grasp more clearly the core concepts in the field of air compressors and provide strong support for day-to-day work and research。
Ii. Compressed media
Why did you choose air as a compressed medium? This is mainly due to the condensability, transparency and ease of delivery of air, which is also a safe and harmless and inexhaustible resource. In addition, inert gases, such as dry nitrogen and carbon dioxide, while not chemically active in the environment, can also be compressed by standard compressors。
The composition and nature of air: dry air accounts for 78. 08 per cent of nitrogen (n2), 20. 93 per cent of oxygen (o2) and 0. 03 per cent of carbon dioxide (co2). Air density is r0 = 1. 293 kg/m3 at 0°c, 760 mmhg。
Distinction between “level” and “paragraph”
In a volume compressor, the gas, after each compression in the working cavity, enters the cooler for cooling, a process known as class one. In a power compressor, the gas usually has to be compressed twice or more by a leaf wheel before entering the cooler for cooling. For ease of description, this series of compressed “levels” with the same cooling frequency is referred to as a “part”. It is noteworthy that in japan, the “class” of volume compressors is referred to directly as “parts”, a term that is also reflected in some parts of china and in the literature。
Pressure
In the compressor industry, the pressure we are referring to is actually the pressure in pa. Specifically, when force works in unit size, we call it pressure. For example, a force of 1 newton on a square metre would create a pressure of 1 pa. When the pressure value is larger, we usually use kpa (1kpa equals 1000pa) or mpa (1 mpa equals 100,000pa) as units. In addition, there are two important pressure concepts in the compressor industry: standard atmospheric pressure (atm) and the distinction between surface pressure and insulation。
Table 1 pressures, i. E. Those measured by pressure tables, represent the difference between the pressure in the container and the local atmospheric pressure, measured at zero points of atmospheric pressure, usually expressed in p(g)。
2 absolute pressure means the pressure measured in an absolute vacuum of zero points, which is equal to the sum of the pressure inside the container and local atmospheric pressure, expressed in p(a). There is a relationship between pressure on the surface and pressure on the atmosphere。
Typically, the exhaust pressure indicated on the compressor sign is a surface pressure。
Iii on work stress
Inhalation and exhaust pressure means the pressure of an air pressurer during inhaling and venting. Specifically, the gas pressure measured at the french air vent taking over the main and upper cylinders of the compressor. In some cases, the exhaust pressure of the compressor is also called "back pressure". For a screwdriver, the inhaling, exhausting pressure means the inhaling, exhausting pressure of the whole machine, while the commonly referred working pressure of the vacuum press is the exhaust pressure。
Conversion of pressure units commonly used in vi air presses
1 mpa (mpa) equals 1,000 kpa (kpa) and 1,000,000 pa (pascal)。
1 bar (bar) equals 0. 1 mpa (mpa)。
1atm (standard atmospheric pressure) equals 0. 1013 mpa or 1. 013 bar, or 760 mmhg, or 10. 33 mh2o。
1kgf/cm2 equals 0. 981 bar and 0. 0981 mpa。
1 psi (pounds per square inch) equals 0. 07031 kggf/cm2 and 0. 06893bar and 6. 893kpa。
1 mpa equals 145 psi. Psi, per square inch of pound strength, is a unit commonly used in product parameters in english-speaking countries such as europe and the united states. In addition, in the air press industry, commonly referred to as “kg” means “bar”。
V. Compression
Temperature compressions like i: the temperature of the gas remains constant during the process of compression, which is referred to as the equivalent temperature compression。
Ii insulation compression: in insulation, i. E. Neither heating nor taking heat from the gas, the compression process is called insulation compression。
Multilateral curve compression iii (practical compression method): this compression will release a portion of the heat generated, with thermal exchange with the outside. Unlike temperature and insulation compression, it is a method of compression frequently used in practice。
Compression ratio (pressure ratio, pressure ratio)
Inner compression ratio i (i. E. Internal pressure ratio)
Internal compression ratio is defined as the ratio between the end pressure (absolute pressure) and the beginning pressure (absolute pressure) of the gas after internal compression。
External compression ratio ii (i. E. External pressure ratio)
The external compression ratio is the ratio between the exhaust pressure (absolute pressure) of the compressor export and the inhaled pressure (absolute pressure) of the imported. In a spiral air press, the pressure ratio (absolute pressure) between the internal compression of the pint finger host and the vent, while the external compression ratio refers to the pressure ratio (absolute pressure) between the overall pump and vent of the air pressure。
Normally, when we talk about compression ratios for air presses, we mean compression ratios. Inhalation pressure usually refers to local atmospheric pressure, whereas exhaust pressure is the rated working pressure of the air press. For example, the exhaust pressure of the yunets air pressurizer ud110-8 is 8bar and the compression ratio is 9。
For multi-level compressors, the total pressure ratio (or pressure ratio) is the ratio of the exhaust pressure measured by the upper exhaust tube receiver to the inhalation pressure measured by the first intake receiver. The nominal ratio of inhalation and exhaust pressure at all levels is referred to as the grade pressure ratio。
Volume traffic
Volume flows are often referred to in china as vents or brand flows. It refers to the volume of gas emitted by the air presses at each unit of time under a given exhaust pressure. This volume value is converted under the inhaling pressure, the inhaling temperature and the humidity at the first intake point in the ingestion state. In short, it represents the volume of inhaled gases. According to national standards, the actual emissions of air presses are considered eligible products provided that they are within a range of 5 per cent of the nominal flow。
When the rate of rotation remains constant, changes in pressure do not theoretically affect volume flows, but may affect quality flows. However, what we usually call venting is the flow of gas, so in practice it remains unchanged。
Gaseous oil content
Gaseous oil content means the amount of oil contained in compressed air in units of volume, including oil droplets, suspended particles and oil vapour. These oils are converted at an absolute pressure of 0. 1 mpa at 20°c and at a relative humidity of 65% in mg/m3. In addition, as a symbol for the amount of trace matter in the mixture, ppm refers to the number of parts or a percentage of one million per million copies, where the weight is more likely than the ppmw and volume ratio ppmv. In the field of air presses, what we usually call ppm is a weight ratio. It should be noted that because of the presence of some oil particles in the air, it is not possible to remove 100 per cent of the gas from the air presses. In general, the exhausts of the oil-jet spiral air presses are controlled below 5 ppm, while the yunets compressor is capable of up to 2 ppm. Centrifugal and oilless gases are almost non-oil-containing because of their special design。
Ix. Elections
Episode point means the temperature at which the wet air cools under constant pressure until it contains unsaturated water vapour and becomes saturated. Specifically, when the air temperature drops to a particular value, the previously unsaturated water vapour begins to liquefied to form a liquid condensate, at which point the temperature is defined as the spot where the gas emerges. In addition, pressure and atmospheric presence are important concepts. Pressure spot means the temperature at which the gas is cooled to the point where unsaturated water vapour is converted to saturated water vapour and distilled under specified pressure conditions. The atmospheric spot is the temperature at which the gas cools to the same state under standard atmospheric pressure. In the air presses industry, exposures are often used to measure gas drying。
X. Temperature
Temperature, as an important indicator of the energy level of a substance at a given time, reflects the heat or cooling of a given thing. The measurement range is based on the ice and boiling points of water. On the accelerometer, the water ice point corresponds to zero degrees, while the boiling point is 100 degrees. Similarly, on the fahrenheit thermometer, the ice point of the water is 32 degrees and the boiling point is 212 degrees。
Ten, altitude
Altitude, or vertical distance above sea level, is a key environmental factor. In the area of compressor engineering, altitude has a significant impact on equipment performance. As the altitude rises, the air becomes thinner, leading to absolute stress reduction. This environmental change adversely affects the cooling effect of electric motors, thus limiting the scope of operation of standard motors in high altitude areas。
Project 111
The operational state of the compressor is affected by a number of factors, in which the import, exhaust pressure and intake temperature are key state parameters, collectively referred to as “facts”. The normal running parameters indicated on the compressor label are referred to as "specific tasks " . When the compressor's actual operational state deviates from this “specified condition”, it is referred to as “transformation”。
Twelve, above power
The power ratio, i. E. The power consumed by compressors under volume flow, is a key indicator for assessing the energy efficiency of compressors. This indicator is particularly important when the same gas is compressed and the exhaust pressure is consistent。
Protection level
The level of protection, expressed in the form of ipxx (of which xx is two arabic numerals), is an important indicator of the extent to which electrical equipment is shielded from dust, foreign matter and moisture。
Fourteen-four, blast-proof level
In areas where there is a potential fire or explosive risk, such as explosive gases, steam, liquids or flammable dust, it is essential to make a blast-proof request for an implementer. The selection of appropriate blast-proof forms and categories is critical to ensure the safe operation of equipment in these hazardous environments. The blast-resistant level is expressed through blast-proof signs ex and its contents, which cover blast-resistant models, equipment types and possible gas and temperature groups。
15. Electrical and other related terminology
I. Power
Ii. Electricity
Iii. Employment
Iv. Among
V. Frequency
Vi. Variable frequency
In the field of air presses, the variable frequency technology is widely applied. It adjusts the speed of the transmission by changing the frequency of the power supply, thereby achieving precise control of the flow. This technology allows for fine-tuning of traffic to 0. 1 bar, which not only improves efficiency but also significantly reduces energy waste. This principle has been applied to achieve energy-saving goals in the yunnites brand。
Viii. Context
In the air presses industry, the direct connection is usually the direct connection achieved through the axis。
Ix, load and unmount
The working state of the air presses is usually defined by the integrity of its inhalation and exhaust process. The complete inhaling and exhausting process is considered to be loading, and the reverse is unloading。
X. Wind and water
Both methods refer to the cooling method of the air presses. Wind cooling is the use of equipment such as fans for heat dispersion, while water cooling is used to reduce temperature through the water cycle system。
Xi, noise
Noise is one of the key indicators for measuring the performance of air presses and is usually measured in db(a)。
