Air compressor foundation knowledge classification

The classification, piston compressor?

Answer: the piston compressor classification method are many, names are different, generally has the following several kinds of classification methods:

(a) according to the compressor cylinder position (the center line of the cylinder) can be divided into:

1, horizontal compressors, cylinders are lying (cylinder into horizontal direction from the center line).

2 are erected, vertical compressor cylinder arrangement (upright compressor).

3, Angle type compressor cylinder decorate L, V, W and star and so on different angles.

(2) according to the compressor cylinder section number (series) can be divided into:

1, single stage compressor (single stage), within the cylinder for a compress a gas.

Section 2, two of the compressor (2) : gas in twice within the cylinder compression.

3, multistage compressor (multiple) : many times within the cylinder compress a gas.

(3) according to the arrangement methods of the cylinder can be divided into:

1, tandem type compressor: several cylinders arranged on the same shaft of multistage compressor, also called single compressor.

2, paratactic type compressor: several parallel arrangement on the number axis cylinder multistage compressor, also called double row compressor or more columns compressor.

3, double compressor: jointly by series connection and parallel connection of multistage compressor.

4, symmetrical balance compressor: cylinder lies are arranged in the crankshaft journal into 180 degrees on both sides of the crankshaft, the decorated H, its inertia force can balance. (large compressor toward this direction).

(4) according to the piston compression action can be divided into:

1, single-acting compressor: only in the side of the piston compresses the gas is also called the single-acting compressor.

2, double-acting compressor: gas can be compressed in both sides of the piston is also called double acting or hyperactivity compressor.

More than 3, single-acting cylinder compressor: using one side of the piston to compress, and have more than one cylinder of the compressor.

More than 4, double-acting cylinder compressor: use both sides of the piston compresses, and have more than one cylinder of the compressor.

(5) according to the compressor exhaust end pressure can be divided into:

1, low-pressure compressor: end of the exhaust pressure in 3 ~ 10 gauge pressure.

2, medium voltage compressor: end of the exhaust pressure gauge pressure in 10 ~ 100.

3, high pressure compressor: exhaust end of stress in the 100 ~ 1000.

4, superhigh pressure compressor: end of the exhaust pressure gage pressure above in 1000.

(6) according to the size of the flow can be divided into:

1, miniature compressor: the capacity under 1 m 3 / min.

2, small compressor: capacity under 1 3 ~ 10 m/min.

3, medium compressor: capacity in the 10 m 3/3 ~ 100 m/min.

4, large compressor: capacity in 100 m3 / min.

(7) according to the speed of the compressor can be divided into:

1, low RPM compressor: under 200 revolutions per minute.

Number 2, transit compressor: in 200 ~ 450 RPM.

3, high RPM compressor: in 450 ~ 1000 RPM.

(8) by transmission types can be divided into:

1, electric compressor: driven by motor;

2, air compressor, powered by a steam engine;

3, powered by internal combustion engine compressor;

4, driven by steam turbine compressor.

(9) by cooling can be divided into:

1, water-cooled compressor: using circulating cooling water and the heat from the compression process.

2, air compressor, using their own wind through the radiator the heat from the compression process.

(10) according to the engine and transmission method of compressor can be divided into:

1, gear coupling rigid body direct drive compressor or close to joint the compressor.

2, flexible coupling device direct drive a compressor.

3, reduction gear drive a compressor.

4, belt, flat belt and v belt drive a compressor.

5, crankshaft, connecting rod mechanism of the free piston compressor.

6, traditional structure of compressor - the motor compressor and compressor engine cylinder block made whole, and common compressor crankshaft.

In addition, there are fixed type and movable, compressor and a cross of the cross points.

Second, what call turbo compressor and circulation machine?

Answer: generally need to use high pressure compressor in the chemical process to further compression pressure several times the atmospheric pressure gas, and further increase the gas pressure, this compressor is called turbo compressor. Cycle machine also is a kind of booster compressor, also calls the circulating pump, its role

Is 50 ~ 1000 gage pressure of gas on the inlet pressure to improve again, 10 ~ 50 gage pressure, to overcome the resistance in the system make up the circulatory system of gas in air. Cycle: is the feature of its work under high pressure, compression ratio is very small, however, and after the compression

Gas temperature is not high, so the general circulation machine without cooling jacket.

Third, what is atmospheric pressure?

A: surrounded by the air called the atmosphere of the earth, the air by gravity surrounded the entire earth. The weight of the air, the pressure of the object referred to as "atmospheric pressure, the air is made up of tiny molecules, has a certain size and weight, when pressure for a big

Air pressure, the temperature is 273 degrees K, 1 cubic centimeters of any gas contains the number of molecules of 2.683 x 1019. We are not feeling to the atmospheric pressure because there is air inside and outside the body, and make the internal and external pressure on both sides of the offset each other, like a guy

In the paper on the shelf, a gently with one finger will wear a hole, but if both sides of the paper with your fingers to resist, with great effort is not damaged. Pressure of objects produced about force by one kilogram per square centimeter, so we are

The atmospheric pressure as a atmospheric pressure.

Four, what call table pressure?

Points out gas pressure on general pressure gauge, not represent the actual pressure of the gas, and for the above atmospheric pressure value, the atmospheric pressure that is not taken into account. Indicated pressure is the atmospheric pressure is zero. Also called indicated pressure or stress. Jane

According to table.

Table pressure = absolute pressure - atmospheric pressure

Five, the astounding to stress?

Answer: table pressure and atmospheric pressure is absolute pressure. It with absolute vacuum is zero.

Absolute pressure = table + the atmospheric pressure

Absolute pressure equals the atmospheric pressure and vacuum pressure

Absolute pressure in the calculation using P said.

6, what is vacuum?

Answer: the container when gas pressure is lower than the atmospheric pressure, vacuum, also known as negative pressure. Completely without any material space (that is, 100% are known as the absolute vacuum vacuum is hard to reach).

Can usually 760 millimeters of mercury (at 0 degrees) is a standard scale. If the indicated the container below the atmospheric pressure readings called vacuum degree. Vacuum pointed out on the pressure value for containers (vacuum) is lower than the atmospheric pressure for gas pressure in the pressure difference, again

Known as the vacuum pressure or low pressure.

The lower the air pressure inside the container means that the higher vacuum degree; The higher the return of the air pressure inside the container (not more than 1 a tm), means that the vacuum degree is lower; If the gas pressure equals the atmospheric pressure container, vacuum is zero, then, not really

Empty.

Seven, temperature and the relationship between the compressor?

A: the degree of cold and hot object, called the temperature. We know from the law of conservation of energy in the work and the heat can be mutual transformation, compressor everywhere temperature increased the conversion from mechanical friction work, compression work. Such as bearing combination improper or poor lubrication will increase

Big friction work, and exchange in the form of heat dissipation, so the bearing temperature rise, even burning bush, so according to the various temperature compressor can judge the machine quality.

Environment temperature and the oil temperature is high and low impact on the compressor has the following points:

1, the suction gas temperature is exorbitant, can reduce the displacement;

In the process of 2, compressed gas temperature is exorbitant, can increase power consumption, lower productivity;

3, cylinder temperature is too high, can make the lubricating oil in the piston valve and coking, lose lubrication, touching spark is in danger of explosion, at the same time can make the piston ring and valve, packing and so on bad parts work, increase the wear and tear, sealed;

4, high temperature will burn out bearing, bearing bush even unable to continue to operate;

5, other part overheating will reduce the mechanical strength and deformation;

6, lubricating oil temperature is too high, can reduce oil viscosity and reduce hydraulic lubrication performance;

7, cooling water temperature too gao will reduce the cooling effect;

8, motor, internal combustion engine temperature will also is in danger of fire.

Temperature, however, also cannot too low, if the cooling water temperature is below zero degrees will freeze and influence of the cooling water circulation, and even freezing machine. Lubricating oil temperature is too low will make the oil viscosity yi big and obstruction of lubrication. If the temperature is too low internal combustion engine is not easy to start, and so on. Therefore, I

Judging from the change of temperature of compressor working is normal, and the various temperature control within the scope of the regulations, to maintain the normal operation, it is an important part of the compressor operation staff should master.