How to choose an air compressor? The main thing is how to match pressure and flow?

For example, if you need to use compressed air equipment, then the maximum rated pressure of the air compressor you choose should be at or 8bar (you can choose a low point for oil-free air compressors, and choose a high point for oil, because the oil will reduce the pressure, which is about 1bar). It also depends on the distance of your equipment from the air compressor and the laying of pipes! The pressure will drop when the distance is long, and the pressure will drop when the pipe turns more!

It's all something to consider when designing!

If the air flow required by the equipment is 40 cubic meters per minute, then you have to choose 2 air pressure with a gas production of about 30 cubic meters per minute, so choose one for the convenience of future expansion, and the other is maintenance, because the maintenance of air compressor equipment will be more troublesome, so even if one is broken, you don't have to stop production. Then you can choose an air compressor with a gas production of more than 40 cubic meters per minute, but if you do this, it will cause the whole plant to shut down once the air compressor needs to be repaired! In general, the choice is, 2 with 1 backup!

If you have money!

Each manufacturer's model has specified the maximum pressure and maximum flow rate, and you can select the machine with your requirements. The types of air compressors are piston type, centrifugal type, and screw type.

The piston type is generally selected for those requiring high pressure and small flow.

Centrifugal type is selected if large flow pressure is required and not particularly high. The screw type is mainly used in occasions with low environmental requirements and low pressure.

The formula for the exhaust volume of the air compressor is q=v(p2-p1-1) t=2 (. The above formula ignores the influence of temperature awareness, if the gas temperature difference before and after filling is large, the temperature should be taken into account when calculating. For example, if the opening pressure of the machine pressure maintenance valve is 4kgf and the rated pressure is 10kgf, it is best to calculate the time consumed by the gas tank from p1 = to p2 = t=, and the volume of the air tank is v=2m3.

In general, the output pressure of the air compressor in the industry is at least MPa, and the pressure sent to the point of use of the equipment is at least MPa. This shows that we have guessed that the typical air compressor used is the unloading pressure of mpa(g) and the cylinder loading pressure of mpa(g) or system pressure.

Aigo air engineers will tell you the detailed explanation and relationship between the three:

Clause. 1. The power of the air compressor: refers to the nameplate power of the matching drive motor or diesel engine. The unit of power is: kW or hp. The conversion method is: 1kw

Clause. 2. Exhaust pressure of air compressor: The working pressure of the air compressor is often called exhaust pressure by domestic users. It refers to the maximum pressure at which the air compressor discharges gas. The commonly used unit of working pressure is: bar or mpa, and the conversion method is: 1

bar=Many users usually refer to the unit of pressure as kg.

The calculation method is:1

bar=1kg。

Clause. 3. The volumetric flow rate of the air compressor: the user often calls the exhaust volume or nameplate flow. It refers to the amount of gas volume discharged by the air compressor per unit time converted to the inlet state under the required exhaust pressure. The volumetric flow rate is measured in m3 min or.

l min, general, commonly used streams.

The unit of measurement is: m3 min. The conversion method is: 1m3=1000L.

Rotational speed, nominal volumetric flow, rated discharge pressure, rated volume.

Rotational speed: The rotational speed will directly affect the time to reach the rated exhaust pressure; Nominal volumetric flow: refers to the gas discharge velocity at the rated discharge pressure; Rated volume: refers to the volume of stored gas.

The above are just some air compressor parameters, so that you can facilitate your reference when choosing the capacity of the air compressor, if you just consider the capacity problem, then the larger one can be: because when your air compressor rated exhaust pressure is 1, and what you need is, in order to stabilize the use of time, of course, choose the large air compressor capacity.

The pressure can be higher than the minimum gas consumption, the flow rate is slightly greater than the maximum gas consumption, and the gas consumption varies greatly, and it is recommended to use a frequency converter.

According to the actual gas usage of your equipment! At**? **The Chamber of Commerce will do the math for you.

Pressure and flow are two important indicators.

When the pressure is selected, the exhaust pressure of the air compressor = equipment pressure + pressure drop (flow selection, 550 pounds min = 550*.)

Select 110%-115% of the actual traffic

That is, 212--222m3 min

If it is under normal pressure, you can choose an air compressor with a flow rate of about 200m min.

Selection of working pressure (exhaust pressure): When the user is ready to purchase an air compressor, it is necessary to determine the working pressure required by the air end, plus a margin of 1-2bar, and then select the pressure of the air compressor (the margin is to consider the pressure loss from the air compressor installation site to the actual distance of the air end pipeline, and the pressure margin is appropriately considered between 1-2bar according to the length of the distance). Of course, the size of the pipeline diameter and the number of turning points are also factors affecting the pressure loss, the larger the pipeline diameter and the fewer turning points, the smaller the pressure loss; Otherwise, the pressure loss will be greater.

Therefore, when the distance between the air compressor and the gas end pipeline is too far, the diameter of the main pipeline should be appropriately enlarged. If the environmental conditions meet the installation requirements of the air compressor and the working conditions permit, it can be installed near the air end. Selection of volumetric flow:

When selecting the volume flow rate of the air compressor, you should first understand the volume flow rate of all gas-using equipment, and multiply the total flow rate by 20% of the margin); The new project can be selected according to the flow value provided by the design institute; Understand the volumetric flow parameters of the gas equipment from the first supplier of gas equipment for selection; The transformation of the air compressor station can be selected with reference to the original parameter value and the actual gas consumption; Appropriate selection is beneficial to the user itself and the air compressor equipment, the selection is too large and wasteful, and the selection is too small, which may cause the air compressor to be in a loading state for a long time or not enough gas or pressure can not be beaten.

First, when choosing the volume flow rate of high-pressure air compressors, you should first understand the volume flow rate of all gas-using equipment, and multiply the total number of flows to amplify the margin by 20%;

Second, the new project can be selected according to the flow value provided by the design institute;

Third, learn about the volumetric flow parameters of the gas-using equipment from the first supplier of gas-using equipment for selection;

Fourth, the transformation of the air compressor station can be selected with reference to the original parameter value combined with the actual gas consumption;

Appropriate selection is beneficial to both the user and the air compressor equipment, the selection is too large and wasteful, and the selection is too small, which may cause the air compressor to be in a loading state for a long time or not enough gas or pressure can not be beaten.

Like this kind of professional knowledge, it is recommended that you search for [Shanghai Denier Air Compressor] to understand, so that you can more clearly understand the relevant knowledge about air compressors, so as not to be so blind.

At present, in the domestic market, including imported brands, it can be said that the parameters displayed on the samples of all manufacturers are virtual, at least more than 10% high, do not believe you to test it with a flowmeter.

The main reasons are as follows.

1. Many manufacturers value the flow, and all manufacturers want to desperately reflect the energy saving of their air compressors, so they know that the flow rate cannot be reached, but they must also elevate, otherwise customers will feel that your flow parameters are so low on so many samples, who dares to buy it.

2. The use environment of many domestic factories and mines is poor or harsh, resulting in a good air compressor host can not be used for a long time, (because of high precision) but the rotor of the air compressor host with poor precision is not easy to bite, but the gas production does not come up.

3. The key is that the vicious competition in China's air compressor industry is fierce, especially the domestic brand air compressors are generally used by domestic poor hosts

If you think what I'm saying is wrong, you can jump out.

The flow rate of the air compressor is directly related to the power, exhaust pressure, motor speed, etc.