Air conditioning compression of various advantages and disadvantages
ac compressor manufacturers how to break through the technology to produce high quality products
Piston Compressor
(1) Piston type compressor works
When the crankshaft of the piston compressor is rotated, the piston will reciprocate by the connecting rod, and the working volume formed by the cylinder inner wall, the cylinder head and the piston top surface will change periodically. When the piston of the piston compressor starts to move from the cylinder head, the working volume in the cylinder gradually increases. At this time, the gas enters the cylinder along the intake pipe, and the intake valve is pushed into the cylinder until the working volume becomes maximum , The intake valve is closed; when the piston of the piston type compressor is moved in the reverse direction, the working volume in the cylinder is reduced and the gas pressure is increased. When the cylinder pressure reaches and is slightly higher than the exhaust pressure, the exhaust valve opens, , Until the piston moves to the extreme position, the exhaust valve closes. The above process is repeated when the piston of the piston compressor is moved backwards again. In short, the piston-type compressor crankshaft rotation of a week, the piston back and forth, the cylinder have to achieve the intake, compression, exhaust process, that is, to complete a working cycle.
(2) the advantages of piston compressor
(1) regardless of the size of the flow, can get the required pressure, exhaust pressure range, the maximum pressure up to 320MPa (industrial applications), or even 700MPa, (laboratory);
(2) stand-alone capacity of 500m3 / min below the arbitrary flow;
(3) in the general pressure range, the requirements of the material is low, the use of ordinary steel materials, processing easier, the cost is relatively low;
(4) thermal efficiency is high, generally large, medium-sized unit adiabatic efficiency of up to 0.7 ~ 0.85 or so;
(5) air volume adjustment, strong adaptability, that is, a wide range of exhaust, and not affected by the level of pressure, can adapt to a wider range of pressure and cooling capacity requirements;
(6) the severity and characteristics of the gas have little effect on the performance of the compressor, the same compressor can be used for different gases;
(7) drive is relatively simple, most of the use of motor, generally not speed, maintainability and strong;
(8) piston compressor technology is more mature, the use of production has accumulated a wealth of experience;
(3) Piston compressor shortcomings
(1) the structure of complex cumbersome, wearing parts and more, covers an area of large, high investment, maintenance workload, the use of a shorter cycle, but after efforts can reach more than 8000 hours
(2) speed is not high, the machine size and weight, stand-alone displacement is generally less than 500m3 / min
(3) vibration in the operation of the machine
(4) exhaust is not continuous, the air is pulsating, easily lead to pipeline vibration, severe jet often due to pulsating, resonance caused by pipe network or mechanical damage
(5) flow adjustment using the subsidy volume or bypass valve, although simple, convenient and reliable, but the power loss is large, in the partial load operation efficiency
(6) oil-lubricated compressor, gas with oil need to be removed
(7) large-scale plant with multiple compression units, the operator or more work intensity
In the case of
1.5.2. Rolling rotor compressors
(1) the working principle of rolling rotor type compressor
Rolling rotor type compressor is a volume type rotary compressor, the cylinder working volume changes
, Is dependent on an eccentric device with a cylindrical rotor
The cylinder to achieve the rolling, as shown below. ; s6]. b% u, i- @ "N6 Y ?? K
Rolling rotor compressor work as shown below:
From the above work process can be seen:
1, the rotor turns a week, will complete the work cycle of the compression and exhaust process and the next working cycle of the suction process.
2, due to not set into the steam valve, the timing of the beginning of the suction and the suction port on the cylinder position has a strict correspondence, does not change with the conditions of change.
3, due to the provision of the exhaust valve, the end of the compression will be with the exhaust pipe pressure changes and changes.
(2) the advantages of rolling the rotor compressor
This type of compressor is now in the home refrigerator and air conditioner applications are also common, its advantages are:
1) simple structure, small size, light weight, compared with the piston compressor, the volume can be reduced by 40% to 50%, the weight can also be reduced by 40% to 50%;
2) less parts, especially less wearing parts, while the friction between the relative movement of components less, and therefore higher reliability;
3) Only the vane has a smaller reciprocating inertia force, the rotational inertia force can be completely balanced, the speed can be higher, and the vibration is small, the operation is smooth;
4) no suction valve, suction time is long, the clearance volume is small, and direct suction, reducing the inhaling harmful overheating, so its high efficiency. But its processing and assembly of high precision requirements. Because there is no gas valve, can be used to transport dirty and with droplets, dust containing process gas;
(3) Rolling rotor compressor shortcomings
The main drawback of the rotary compressor is the leakage between the vane and the cylinder wall, friction and wear larger, limiting its working life and efficiency improvement; and the compressor processing accuracy requirements are higher. If the use of double-speed vane, the two ends of the slide when running with the cylinder wall to keep in touch, the formation of two sealing lines, and in the two seal between the formation of oil seal, greatly reducing the end of the slider leakage loss, Reduce the friction and friction losses, so that the working life of the machine and efficiency are improved.
Once the compressor is worn at its bearing, spindle, roller or vane, the gap increases and will immediately have a noticeable adverse effect on its performance, so it is usually used in the factory with the overall assembly of the refrigerator, air conditioning Device, the system also requires a higher degree of cleanliness.
In the case of
1.5.3. Scroll Compressor
(1) the working principle of the scroll compressor
The main component in the scroll compressor is an involute scroll having two identical but angular phase positions offset by 180 °, one for the fixed scroll and the other by the eccentric shaft, A fixed orifice plate that revolves around a revolving disk. In the work of the two scrolls in a number of tangential to form a sealing line, plus two ends of the scroll plate at the appropriate seal, resulting in several crescent cavities. The sealing lines at the common tangent points between the two scrolls are continuously moved along the vortex curve as the revolutions of the orbiting scrolls cause the shape of the crescent cavities to change. The suction port of the compressor is opened in the upper part of the fixed scroll shell. When the eccentric shaft rotates clockwise
Turn, the gas from the suction port into the suction chamber, have been taken to the outside of the suction chamber connected with the crescent-shaped cavity
in. As these peripheral crescent cavities are closed and no longer communicate with the suction chamber, the enclosed volume is gradually transferred to the center of the fixed scroll and is continuously reduced, and the gas is continuously compressed and the pressure is increased.
(2) the advantages of scroll compressor
From the specific structure point of view, the scroll compressor does not have suction, exhaust valve, which greatly improves the reliability of high-speed operation.
Taken together, scroll compressor has the following main features:
⑴, belonging to the third generation of compressors, a number of compression chamber at the same time, adjacent compression chamber between the gas pressure is small, less gas leakage, high volumetric efficiency, up to 98%, than the second generation compressor rotor compression Machine efficiency is about 5% higher;
⑵, driven by moving the eccentric axis of the scroll can be high-speed rotation, therefore, scroll compressor small size and light weight;
⑶, moving scroll and spindle and other moving parts of the force change is small, the whole vibration is small;
⑷, no suction, exhaust valve, scroll compressor running reliable, and particularly adapted to variable speed movement and frequency control technology;
(5) The compression chamber of the scroll compressor is composed of a scroll line, which is a multi-chamber compression mechanism. When the center of the movable scroll is circularly moving around the center of the fixed scroll, the volume of each compression chamber changes with the rotation angle of the spindle. Correspondingly reduced or expanded, thereby achieving the gas inhalation, compression and exhaust process, due to suction and exhaust process is almost continuous, the machine noise is very low;
⑹, axial and radial flexible structure to improve the efficiency of the scroll compressor, and to ensure that the axial clearance and radial clearance of the sealing effect, not because of friction and wear and tear, that is, scroll compressor has a reliable and effective Sealing, so the cooling coefficient is not reduced with the increase in running time, but a slight increase;
⑺, scroll compressor has a good working characteristics, performance is mainly affected by their own compression ratio and suction pressure, exhaust pressure range, for a variety of indoor and outdoor environment, to ensure that the compressor has been operating under the high efficiency, Thus ensuring the energy efficiency ratio of air conditioning units. In the heat pump air conditioning system, especially in the high thermal performance, good stability, high security;
⑻, scroll compressor no clearance volume, the structure is multi-chamber compression, the adjacent chamber pressure difference is not very large (approximately continuous change), while the moving and static scroll end contact of the seal on the shaft To the back pressure is pressed so that the moving and static scrolls in close contact, and with the help of frozen oil to achieve a good sealing effect, so that the internal leakage is almost no; when the seal side of the plane is worn, The direction of automatic compensation to ensure that the moving scroll end of the disk and the bottom of the static scroll is always close, and the longer the compressor working hours, the more closely with the relative movement of the surface with the better, the better the sealing effect, these advantages make the vortex Compressor does not exist secondary compression refrigerant gas problem, is to maintain high efficiency operation of one of the important protection factors;
⑼, small torque changes, high balance, vibration, smooth operation, and thus easy to operate,
Easy to automate;
⑽, because of its own moving parts less, there is no reciprocating mechanism, so the structure is simple, small size, light weight, parts less (especially
Less wearing parts), high reliability, life expectancy in more than 20 years.
(3) the shortcomings of the scroll compressor
(1) the surface of its moving parts are curved surface shape, the surface of the processing and inspection are more complex, manufacturing need high-precision processing equipment and precision aligning assembly technology, so the manufacturing cost is higher.
(2) between the moving parts or between the moving parts and fixed parts, often to maintain a certain movement gap to achieve the seal, the gas is bound to cause leakage through the gap, which limits the rotary compressor is difficult to achieve a larger Compression ratio, therefore, most of the rotary compressor used in air conditioning conditions.
In the case of
1.5.4. Screw compressors
(1) screw compressor works
The screw compressor is formed by forming a tooth-shaped suction refrigerant by engaging a male rotor (hereinafter referred to as "M rotor") composed of five teeth and a female rotor (hereinafter referred to as "F rotor") composed of six teeth, Toothed space to compress the refrigerant to the specified pressure. The working flow of the screw compressor is as follows:
In the case of
Inhalation stroke
And the refrigerant is sucked from the suction port in the axial direction to the opening in the radial direction. With the rotation of the rotor, on the underside of the rotor, the meshing is separated and the length of the tooth groove increases, and the refrigerant is sucked into the toothed space.
[Compression stroke]
The tooth line is engaged with the suction side of the tooth groove, and the sealing line gradually travels toward the discharge side, and the tooth space is reduced and compressed.
[Compression stroke]
By means of the lubricating oil sucked together with the refrigerant, an oil film seal is formed in the rotor gap, and the rotor is lubricated. The male rotor and the female rotor are gradually compressed toward the discharge port, and the pressure is increased.
[Discharge stroke]
The tooth space is connected to the discharge port and the discharge is started. This trip continues until the discharge end until the refrigerant in the toothed space is completely delivered.
(2) the advantages of screw compressors
(1) less parts, less wearing parts, high reliability;
(2) easy operation and maintenance;
(3) there is no unbalanced inertia force. Operation smooth and safe, small vibration;
(4) has the characteristics of forced gas transmission, the exhaust gas is almost not affected by the exhaust pressure, the adaptability of working conditions;
(5) screw compressor rotor tooth surface is actually a gap, so the wet stroke is not sensitive to resistance to liquid;
(6) low exhaust temperature, can be operated at higher pressure ratio conditions:
(7) can be achieved cooling stepless adjustment, the use of slide valve mechanism, so that the cooling capacity from 15% to 100% stepless adjustment, saving operating costs;
(8) easy to achieve automation, can achieve remote communication.
(2) screw compressor shortcomings
(1) rotor tooth surface is a spatial surface, the need to use a special tool, expensive equipment in the processing, the body parts processing accuracy also has a high demand, must use high-precision equipment:
(2) due to the interdental volume and the suction and exhaust port, so the compressor noise is high;
(3) due to the rotor stiffness and bearing life and other restrictions,
Compressor can only rely on the gap inside the seal, so the screw compressor can only be applied to the low pressure range, can not be used for high pressure occasions;
(4) due to large fuel injection, oil treatment system is complex, so the unit attached equipment;
(5) Lo
The rod compressor relies on the gap to seal the air off and does not have superior performance in the small volume range.
In the case of
1.5.5. Centrifugal Compressor
(1) the work of the centrifugal compressor
Centrifugal refrigeration compressor construction and working principle and centrifugal blower is very similar. But its working principle and the piston compressor is fundamentally different, it is not the use of cylinder volume reduction to improve the way the gas pressure, but rely on changes in kinetic energy to improve the gas pressure. The centrifugal compressor has a working wheel with a blade. When the working wheel rotates, the blade drives the gas movement or causes the kinetic energy of the gas, and then converts part of the kinetic energy into pressure to increase the pressure of the gas. This type of compressor because of its work when the refrigerant vapor inhalation, and constantly in the radial direction was thrown out, so that this type of compressor for the centrifugal compressor.
(2) the advantages of centrifugal compressor
1, centrifugal compressor gas volume, simple and compact structure, light weight, small size, small footprint, relative to the piston compressor, the same cooling capacity, the weight of the piston lighter than 5 to 8 times. In the case of
2, because it does not have the valve piston ring and other vulnerable parts, and no crank connecting rod mechanism, balanced operation, reliable operation, high operating rate, less friction, spare parts need less, maintenance costs and fewer personnel. In the case of
3, between the work wheel and the chassis without friction, no lubrication. In the chemical process, the centrifugal compressor on the chemical medium can be absolutely oil-free compression process. In the case of
4, centrifugal compressor for a rotary movement of the machine, it is suitable for industrial steam turbine or steam turbine direct drag. On the general large-scale chemical plants, commonly used by-product steam-driven industrial steam turbine for the comprehensive utilization of heat to provide the possibility.
(3) the shortcomings of centrifugal compressor
1, centrifugal compressor is not yet suitable for the gas is too small and the pressure ratio is too high occasions, and because the appropriate use of relatively large molecular weight refrigerant, it is only applicable to large cooling capacity, generally in 25 to 30 million / Time or more.
2, centrifugal compressor stable working area is narrow, the gas regulation is more convenient, but the economy is poor.
Piston Compressor
(1) Piston type compressor works
(2) the advantages of piston compressor
(1) regardless of the size of the flow, can get the required pressure, exhaust pressure range, the maximum pressure up to 320MPa (industrial applications), or even 700MPa, (laboratory);
(2) stand-alone capacity of 500m3 / min below the arbitrary flow;
(3) in the general pressure range, the requirements of the material is low, the use of ordinary steel materials, processing easier, the cost is relatively low;
(4) thermal efficiency is high, generally large, medium-sized unit adiabatic efficiency of up to 0.7 ~ 0.85 or so;
(5) air volume adjustment, strong adaptability, that is, a wide range of exhaust, and not affected by the level of pressure, can adapt to a wider range of pressure and cooling capacity requirements;
(6) the severity and characteristics of the gas have little effect on the performance of the compressor, the same compressor can be used for different gases;
(7) drive is relatively simple, most of the use of motor, generally not speed, maintainability and strong;
(8) piston compressor technology is more mature, the use of production has accumulated a wealth of experience;
(3) Piston compressor shortcomings
(1) the structure of complex cumbersome, wearing parts and more, covers an area of large, high investment, maintenance workload, the use of a shorter cycle, but after efforts can reach more than 8000 hours
(2) speed is not high, the machine size and weight, stand-alone displacement is generally less than 500m3 / min
(3) vibration in the operation of the machine
(4) exhaust is not continuous, the air is pulsating, easily lead to pipeline vibration, severe jet often due to pulsating, resonance caused by pipe network or mechanical damage
(5) flow adjustment using the subsidy volume or bypass valve, although simple, convenient and reliable, but the power loss is large, in the partial load operation efficiency
(6) oil-lubricated compressor, gas with oil need to be removed
(7) large-scale plant with multiple compression units, the operator or more work intensity
In the case of
1.5.2. Rolling rotor compressors
(1) the working principle of rolling rotor type compressor
Rolling rotor type compressor is a volume type rotary compressor, the cylinder working volume changes
, Is dependent on an eccentric device with a cylindrical rotor
The cylinder to achieve the rolling, as shown below. ; s6]. b% u, i- @ "N6 Y ?? K
Rolling rotor compressor work as shown below:
From the above work process can be seen:
1, the rotor turns a week, will complete the work cycle of the compression and exhaust process and the next working cycle of the suction process.
2, due to not set into the steam valve, the timing of the beginning of the suction and the suction port on the cylinder position has a strict correspondence, does not change with the conditions of change.
3, due to the provision of the exhaust valve, the end of the compression will be with the exhaust pipe pressure changes and changes.
(2) the advantages of rolling the rotor compressor
This type of compressor is now in the home refrigerator and air conditioner applications are also common, its advantages are:
1) simple structure, small size, light weight, compared with the piston compressor, the volume can be reduced by 40% to 50%, the weight can also be reduced by 40% to 50%;
2) less parts, especially less wearing parts, while the friction between the relative movement of components less, and therefore higher reliability;
3) Only the vane has a smaller reciprocating inertia force, the rotational inertia force can be completely balanced, the speed can be higher, and the vibration is small, the operation is smooth;
4) no suction valve, suction time is long, the clearance volume is small, and direct suction, reducing the inhaling harmful overheating, so its high efficiency. But its processing and assembly of high precision requirements. Because there is no gas valve, can be used to transport dirty and with droplets, dust containing process gas;
(3) Rolling rotor compressor shortcomings
The main drawback of the rotary compressor is the leakage between the vane and the cylinder wall, friction and wear larger, limiting its working life and efficiency improvement; and the compressor processing accuracy requirements are higher. If the use of double-speed vane, the two ends of the slide when running with the cylinder wall to keep in touch, the formation of two sealing lines, and in the two seal between the formation of oil seal, greatly reducing the end of the slider leakage loss, Reduce the friction and friction losses, so that the working life of the machine and efficiency are improved.
Once the compressor is worn at its bearing, spindle, roller or vane, the gap increases and will immediately have a noticeable adverse effect on its performance, so it is usually used in the factory with the overall assembly of the refrigerator, air conditioning Device, the system also requires a higher degree of cleanliness.
In the case of
1.5.3. Scroll Compressor
(1) the working principle of the scroll compressor
The main component in the scroll compressor is an involute scroll having two identical but angular phase positions offset by 180 °, one for the fixed scroll and the other by the eccentric shaft, A fixed orifice plate that revolves around a revolving disk. In the work of the two scrolls in a number of tangential to form a sealing line, plus two ends of the scroll plate at the appropriate seal, resulting in several crescent cavities. The sealing lines at the common tangent points between the two scrolls are continuously moved along the vortex curve as the revolutions of the orbiting scrolls cause the shape of the crescent cavities to change. The suction port of the compressor is opened in the upper part of the fixed scroll shell. When the eccentric shaft rotates clockwise
Turn, the gas from the suction port into the suction chamber, have been taken to the outside of the suction chamber connected with the crescent-shaped cavity
in. As these peripheral crescent cavities are closed and no longer communicate with the suction chamber, the enclosed volume is gradually transferred to the center of the fixed scroll and is continuously reduced, and the gas is continuously compressed and the pressure is increased.
(2) the advantages of scroll compressor
From the specific structure point of view, the scroll compressor does not have suction, exhaust valve, which greatly improves the reliability of high-speed operation.
Taken together, scroll compressor has the following main features:
⑴, belonging to the third generation of compressors, a number of compression chamber at the same time, adjacent compression chamber between the gas pressure is small, less gas leakage, high volumetric efficiency, up to 98%, than the second generation compressor rotor compression Machine efficiency is about 5% higher;
⑵, driven by moving the eccentric axis of the scroll can be high-speed rotation, therefore, scroll compressor small size and light weight;
⑶, moving scroll and spindle and other moving parts of the force change is small, the whole vibration is small;
⑷, no suction, exhaust valve, scroll compressor running reliable, and particularly adapted to variable speed movement and frequency control technology;
(5) The compression chamber of the scroll compressor is composed of a scroll line, which is a multi-chamber compression mechanism. When the center of the movable scroll is circularly moving around the center of the fixed scroll, the volume of each compression chamber changes with the rotation angle of the spindle. Correspondingly reduced or expanded, thereby achieving the gas inhalation, compression and exhaust process, due to suction and exhaust process is almost continuous, the machine noise is very low;
⑹, axial and radial flexible structure to improve the efficiency of the scroll compressor, and to ensure that the axial clearance and radial clearance of the sealing effect, not because of friction and wear and tear, that is, scroll compressor has a reliable and effective Sealing, so the cooling coefficient is not reduced with the increase in running time, but a slight increase;
⑺, scroll compressor has a good working characteristics, performance is mainly affected by their own compression ratio and suction pressure, exhaust pressure range, for a variety of indoor and outdoor environment, to ensure that the compressor has been operating under the high efficiency, Thus ensuring the energy efficiency ratio of air conditioning units. In the heat pump air conditioning system, especially in the high thermal performance, good stability, high security;
⑻, scroll compressor no clearance volume, the structure is multi-chamber compression, the adjacent chamber pressure difference is not very large (approximately continuous change), while the moving and static scroll end contact of the seal on the shaft To the back pressure is pressed so that the moving and static scrolls in close contact, and with the help of frozen oil to achieve a good sealing effect, so that the internal leakage is almost no; when the seal side of the plane is worn, The direction of automatic compensation to ensure that the moving scroll end of the disk and the bottom of the static scroll is always close, and the longer the compressor working hours, the more closely with the relative movement of the surface with the better, the better the sealing effect, these advantages make the vortex Compressor does not exist secondary compression refrigerant gas problem, is to maintain high efficiency operation of one of the important protection factors;
⑼, small torque changes, high balance, vibration, smooth operation, and thus easy to operate,
Easy to automate;
⑽, because of its own moving parts less, there is no reciprocating mechanism, so the structure is simple, small size, light weight, parts less (especially
Less wearing parts), high reliability, life expectancy in more than 20 years.
(3) the shortcomings of the scroll compressor
(1) the surface of its moving parts are curved surface shape, the surface of the processing and inspection are more complex, manufacturing need high-precision processing equipment and precision aligning assembly technology, so the manufacturing cost is higher.
(2) between the moving parts or between the moving parts and fixed parts, often to maintain a certain movement gap to achieve the seal, the gas is bound to cause leakage through the gap, which limits the rotary compressor is difficult to achieve a larger Compression ratio, therefore, most of the rotary compressor used in air conditioning conditions.
In the case of
1.5.4. Screw compressors
(1) screw compressor works
The screw compressor is formed by forming a tooth-shaped suction refrigerant by engaging a male rotor (hereinafter referred to as "M rotor") composed of five teeth and a female rotor (hereinafter referred to as "F rotor") composed of six teeth, Toothed space to compress the refrigerant to the specified pressure. The working flow of the screw compressor is as follows:
In the case of
Inhalation stroke
And the refrigerant is sucked from the suction port in the axial direction to the opening in the radial direction. With the rotation of the rotor, on the underside of the rotor, the meshing is separated and the length of the tooth groove increases, and the refrigerant is sucked into the toothed space.
[Compression stroke]
The tooth line is engaged with the suction side of the tooth groove, and the sealing line gradually travels toward the discharge side, and the tooth space is reduced and compressed.
[Compression stroke]
By means of the lubricating oil sucked together with the refrigerant, an oil film seal is formed in the rotor gap, and the rotor is lubricated. The male rotor and the female rotor are gradually compressed toward the discharge port, and the pressure is increased.
[Discharge stroke]
The tooth space is connected to the discharge port and the discharge is started. This trip continues until the discharge end until the refrigerant in the toothed space is completely delivered.
(2) the advantages of screw compressors
(1) less parts, less wearing parts, high reliability;
(2) easy operation and maintenance;
(3) there is no unbalanced inertia force. Operation smooth and safe, small vibration;
(4) has the characteristics of forced gas transmission, the exhaust gas is almost not affected by the exhaust pressure, the adaptability of working conditions;
(5) screw compressor rotor tooth surface is actually a gap, so the wet stroke is not sensitive to resistance to liquid;
(6) low exhaust temperature, can be operated at higher pressure ratio conditions:
(7) can be achieved cooling stepless adjustment, the use of slide valve mechanism, so that the cooling capacity from 15% to 100% stepless adjustment, saving operating costs;
(8) easy to achieve automation, can achieve remote communication.
(2) screw compressor shortcomings
(1) rotor tooth surface is a spatial surface, the need to use a special tool, expensive equipment in the processing, the body parts processing accuracy also has a high demand, must use high-precision equipment:
(2) due to the interdental volume and the suction and exhaust port, so the compressor noise is high;
(3) due to the rotor stiffness and bearing life and other restrictions,
Compressor can only rely on the gap inside the seal, so the screw compressor can only be applied to the low pressure range, can not be used for high pressure occasions;
(4) due to large fuel injection, oil treatment system is complex, so the unit attached equipment;
(5) Lo
The rod compressor relies on the gap to seal the air off and does not have superior performance in the small volume range.
In the case of
1.5.5. Centrifugal Compressor
(1) the work of the centrifugal compressor
Centrifugal refrigeration compressor construction and working principle and centrifugal blower is very similar. But its working principle and the piston compressor is fundamentally different, it is not the use of cylinder volume reduction to improve the way the gas pressure, but rely on changes in kinetic energy to improve the gas pressure. The centrifugal compressor has a working wheel with a blade. When the working wheel rotates, the blade drives the gas movement or causes the kinetic energy of the gas, and then converts part of the kinetic energy into pressure to increase the pressure of the gas. This type of compressor because of its work when the refrigerant vapor inhalation, and constantly in the radial direction was thrown out, so that this type of compressor for the centrifugal compressor.
(2) the advantages of centrifugal compressor
1, centrifugal compressor gas volume, simple and compact structure, light weight, small size, small footprint, relative to the piston compressor, the same cooling capacity, the weight of the piston lighter than 5 to 8 times. In the case of
2, because it does not have the valve piston ring and other vulnerable parts, and no crank connecting rod mechanism, balanced operation, reliable operation, high operating rate, less friction, spare parts need less, maintenance costs and fewer personnel. In the case of
3, between the work wheel and the chassis without friction, no lubrication. In the chemical process, the centrifugal compressor on the chemical medium can be absolutely oil-free compression process. In the case of
4, centrifugal compressor for a rotary movement of the machine, it is suitable for industrial steam turbine or steam turbine direct drag. On the general large-scale chemical plants, commonly used by-product steam-driven industrial steam turbine for the comprehensive utilization of heat to provide the possibility.
(3) the shortcomings of centrifugal compressor
1, centrifugal compressor is not yet suitable for the gas is too small and the pressure ratio is too high occasions, and because the appropriate use of relatively large molecular weight refrigerant, it is only applicable to large cooling capacity, generally in 25 to 30 million / Time or more.
2, centrifugal compressor stable working area is narrow, the gas regulation is more convenient, but the economy is poor.
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