Corresponding fan is a mechanical energy that rely on input mechanical energy to improve gas pressure and exhaust gas. It is a kind of mobilized fluid machinery. Centrifugal fan is widely used in the ventilation, dust discharge and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and quotation of boilers and industrial furnaces; Ventilation; drying and selection of grains; wind and pads and pushing boat inflatable and promotion.
Chinese name In centrifugal fans Foreign names fan Principles R n as a non -compressed fluid treatment The structure Development prospects
The performance characteristics
The fault repair
Note
N Corresponding fan is based on the principle of changing momentum to potential energy. The impeller of high -speed rotation accelerates the gas, and then slows down and changes the flow to convert the kinetic energy into potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the flow direction and the pipeline section area increases the ambassador's air flow deceleration. This deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure [1]. Forization The working principle of the centrifugal fan is basically the same as the flat compressor, which are due to the low gas flow rate and the pressure change. Generally, the changes in the gas ratio of the gas are not needed, that is, the gas is used as the inaccessor. Compressed fluid treatment.
In centrifugal fans In centrifugal fans can be made into two types: right rotation and left -handed type. Focusing on the motor on the side of the motor: rotate the clockwise of the impeller, called the right rotary fan; the impeller rotates the clockwise clockwise, called the left rotor fan. The constructor In centrifugal fans consisting of cases, spindles, impeller, bearing transmission mechanism and motor. Cases: It is made of strong and reliable for steel plates, which can be a split -to -semi -open type, and the semi -open type is easy to repair. The impeller: consisting of the blade, curve front plate and flat plate rear disc. Rotor: Static balance and dynamic balance should be done to ensure stable rotation and good performance. The transmission part: the main shaft, bearing box, rolling bearings and belt wheels (or couplet). The development history In 1862, Guibei in the United Kingdom invented a centrifugal fan. Its impeller and case were fifty -hearted type. The case was made of brick. , Mainly used for mine ventilation. In 1880, people designed a snail -shaped case for ore rowing air, and the centrifugal fans that were curved to bended. The structure was relatively complete. 1892 French research and formulation into a bumper fan; in 1898, the Irish designed the Siroko -style centrifugal fans with front -oriented leaves and was widely used in various countries. In the 19th century The wind is winding, but its pressure is only 100 to 300 pamble, and the efficiency is only 15-25%. It did not develop rapidly until the 1940s. In 1935, Germany first used axis such as axis flow to ventilate and attract air; in 1948, Denmark was made into a bearing fans that can be adjusted during operation; Flowing fan and horizontal fans; in 2002, China ’s explosion -proof centrifugal fan was widely used in the fields of chemical, oil, and machinery. Corresponding fan is a auxiliary production equipment commonly used by stone processing enterprises. It is mainly used in ventilation and dust removal devices. For example, the cyclone dust collector and bag dust collector in stone cutting and polishing processes need to use centrifugal fan to use the dust removal treatment to ensure production to ensure production to ensure production to ensure production to ensure production. The environment is clean and protects the producer's physical and mental health. The fan is a high -energy -consuming device. The proportion of electricity resources consumed by the ventilator in stone processing is large. With the increasing shortage of energy in my country and the promotion and application of high yield and efficient working surfaces, energy saving and consumption reduction have become stone production The issues that enterprises generally pay attention to, many stone manufacturers have reduced the power consumption of the fan as the current important task. In addition to improving the efficiency of the fan itself, the power consumption of the fan is the most important to reasonably choose the adjustment method of the fan. Because the load of the stone production changes with the needs of the process, most
In centrifugal fans The fans need to regulate the traffic frequently according to the host load. At present, the energy -saving adjustment method of stone processing enterprise fan is relatively old, and it is generally used for throttling. When the flow adjustment is adopted, the flow of the fan is mainly adjusted by the adjustment valve or the throttling baffle. The fans have a large daily flow, and even more than 50%during low load. Energy waste is very serious. And if the speed of regulating fan can not only cancel the losses of the node, but also ensure that the fan is always running in an high -efficiency area, so it can greatly save electricity. It can be said that the speed of adjusting the fan to run the fan is an effective way of energy saving, reflecting the new trend of the current production of building materials industry. The development prospects With the advancement of my country's industrialization process, the industrial industry is vigorously carrying out energy conservation and consumption reduction, industrial upgrading and integration and reorganization. Industrial basic equipment needs to be updated in large quantities. As an important supporting equipment for industry, centrifugal fan will be applied more in the fields of power, cement, petrochemical, coal, mines and environmental protection. Under the new economic development situation, the future centrifugal fan industry will continue to maintain rapid growth. It is estimated that by 2022, the market size of the centrifugal fan industry will reach 96 billion yuan. The performance characteristics In centrifugal fan is essentially a variable flow constant pressure device. When the speed is certain, the pressure-flow theoretical curve of the centrifugal fan should be a straight line. Due to internal losses, the actual characteristic curve is bent. The pressure generated in the centrifugal fan is greatly affected by changes in the temperature or density of the intake. For a given air intake amount, the highest air intake temperature (the lowest air density) is the lowest. For a given pressure and traffic characteristic curve, there is a power and traffic characteristic curve. At this time, for a given flow, the required power increases with the decrease in the temperature of the air. The fault repair On the wear of the transmission part of the centrifugal fan is a common equipment problem, including the fuel bearing Position, bearing room wear, winding machine bearing position, etc. In response to the above -mentioned faults of centrifugal fans, traditional maintenance methods include pile welding, heat spraying, brush ferry, etc., but there are certain disadvantages: the thermal stress generated by the high temperature of the replenishment of welding cannot be completely eliminated, which can easily cause material damage, resulting in bending or broken of the components; The plating of the appliance is limited by the thickness of the coating, and it is easy to peel off. The above two methods are fixed metal with metals. Damage again. In contemporary Western countries, the above issues mostly use the repair method of polymer composite materials, and the more applications are the American Fu Shilan technology system. It has super strong adhesion, excellent pressure resistance strength, etc. Processing. There is no supplementary welding thermal stress, and the thickness of the repair is not restricted. At the same time, the metal material that the product has not possessed the concession, the impact vibration of absorbing equipment, avoiding the possibility of re -wear It is also gradually replaced by traditional methods [2].
In centrifugal fans Note The shutdown procedures 1. Emergency stop: During the trial operation of the crew, one of the following situations should be immediately stopped. The operation of the emergency shutdown is to press the main motor parking button, and then perform the aftermath after the shutdown. a, the centrifugal fan suddenly vibrated, and it has exceeded the card. b, there are scratches or abnormal friction sound inside the body. c, any bearing or sealing, smoke, or a certain bearing temperature rose sharply to the alarm value. D, the oil pressure is lower than the alarm value and cannot return to normal. e and fuel tank liquid levels are low, and there are already inhalation. F, a shaft shift value has significantly continued to grow, when the alarm value is reached. 2, normal shutdown: The unit's normal shutdown is performed according to the following procedure. a, gradually open the open valve (or export bypass valve), and gradually turn off the exhaust valve. b, gradually turn off the small air festival door to 20-25 °. c, press the parking button, and pay attention to the abnormal phenomenon during the shutdown process. D, the unit stops 5 to 10 minutes, or the fuel supply can be stopped when the bearings temperature drops below 45 ° C. For units with floating rings, the sealing oil pump must continue to supply fuel until the body temperature is lower than 80 ° C. After the unit stops, the rotor should be moved at 180 ° within 2 to 4 hours.
This centrifugal fan is very widely used, so you should master its principles so that it can work better. The centrifugal fan is based on the principle of the conversion of kinetic energy to potential energy. The impeller of high -speed rotation accelerates the gas, and then slows down and changes the flow, so that the kinetic energy is converted into potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the flow direction and the pipeline section area increases the ambassador's air flow deceleration. This deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure. Forization The working principle of the centrifugal fan is basically the same as the flat compressor, which are due to the low gas flow rate and the pressure change. Generally, the changes in the gas ratio of the gas are not needed, that is, the gas is used as the inaccessor. Compressed fluid treatment.
The centrifugal fan can be made into two types: right rotation and left -handed type. Focusing on the motor on the side of the motor: the impeller rotates when it goes smoothly, called the right rotary fan;
The constructor In centrifugal fans consisting of cases, spindles, impeller, bearing transmission mechanism and motor.
Cases: It is made of strong and reliable from steel plates. It can be a split and semi -open type.
The impeller: consisting of blades, curve -type front plates and flat plates.
Rotor: Static balance and dynamic balance should be done to ensure smooth rotation and good performance.
The centrifugal fan is based on the principle of the conversion of kinetic energy to potential energy. The impeller of high -speed rotation is used to accelerate the gas, and then slow down and change the flow, so that the kinetic energy is converted into potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the direction of the flow caused by deceleration, and this deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure.
Corresponding fan is a mechanical energy that rely on input mechanical energy to improve gas pressure and exhaust gas. It is a kind of mobilized fluid machinery. Centrifugal fan is widely used in the ventilation, dust discharge and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and quotation of boilers and industrial furnaces; Ventilation; drying and selection of grains; wind and pads and pushing boat inflatable and promotion.
The centrifugal fan is based on the principle of the power conversion to potential energy. The high -speed rotating impeller accelerates the gas, and then slows down and changes to the potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the flow direction and the pipeline section area increases the ambassador's air flow deceleration. This deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure.
When the motor rotates, the impeller of the fan rotates. When the leaf wheels are rotated, the air is thrown out of the impeller, and the air is thrown out of the impeller and gathered in the case. Due to the slow speed and high pressure, the air is discharged from the ventilator exit into the pipeline. When the air in the impeller was discharged, negative pressure was formed, and the air outside the inhaled mouth was pressed into the impeller under the action of atmospheric pressure. Therefore, the leaf wheels are constantly rotating, and the air is continuously flowing in the pipeline under the influence of a ventilator.
Corresponding fan is a mechanical energy that rely on input mechanical energy to improve gas pressure and exhaust gas. It is a kind of mobilized fluid machinery. Centrifugal fan is widely used in the ventilation, dust discharge and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and quotation of boilers and industrial furnaces; Ventilation; drying and selection of grains; wind and pads and pushing boat inflatable and promotion.
Chinese name
In centrifugal fans
Foreign names
fan
Principles
R n as a non -compressed fluid treatment
The structure
Development prospects
The performance characteristics
The fault repair
Note
N Corresponding fan is based on the principle of changing momentum to potential energy. The impeller of high -speed rotation accelerates the gas, and then slows down and changes the flow to convert the kinetic energy into potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the flow direction and the pipeline section area increases the ambassador's air flow deceleration. This deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure [1].
Forization
The working principle of the centrifugal fan is basically the same as the flat compressor, which are due to the low gas flow rate and the pressure change. Generally, the changes in the gas ratio of the gas are not needed, that is, the gas is used as the inaccessor. Compressed fluid treatment.
In centrifugal fans
In centrifugal fans can be made into two types: right rotation and left -handed type. Focusing on the motor on the side of the motor: rotate the clockwise of the impeller, called the right rotary fan; the impeller rotates the clockwise clockwise, called the left rotor fan.
The constructor
In centrifugal fans consisting of cases, spindles, impeller, bearing transmission mechanism and motor.
Cases: It is made of strong and reliable for steel plates, which can be a split -to -semi -open type, and the semi -open type is easy to repair.
The impeller: consisting of the blade, curve front plate and flat plate rear disc.
Rotor: Static balance and dynamic balance should be done to ensure stable rotation and good performance.
The transmission part: the main shaft, bearing box, rolling bearings and belt wheels (or couplet).
The development history
In 1862, Guibei in the United Kingdom invented a centrifugal fan. Its impeller and case were fifty -hearted type. The case was made of brick. , Mainly used for mine ventilation.
In 1880, people designed a snail -shaped case for ore rowing air, and the centrifugal fans that were curved to bended. The structure was relatively complete.
1892 French research and formulation into a bumper fan; in 1898, the Irish designed the Siroko -style centrifugal fans with front -oriented leaves and was widely used in various countries. In the 19th century The wind is winding, but its pressure is only 100 to 300 pamble, and the efficiency is only 15-25%. It did not develop rapidly until the 1940s.
In 1935, Germany first used axis such as axis flow to ventilate and attract air; in 1948, Denmark was made into a bearing fans that can be adjusted during operation; Flowing fan and horizontal fans; in 2002, China ’s explosion -proof centrifugal fan was widely used in the fields of chemical, oil, and machinery. Corresponding fan is a auxiliary production equipment commonly used by stone processing enterprises. It is mainly used in ventilation and dust removal devices. For example, the cyclone dust collector and bag dust collector in stone cutting and polishing processes need to use centrifugal fan to use the dust removal treatment to ensure production to ensure production to ensure production to ensure production to ensure production. The environment is clean and protects the producer's physical and mental health. The fan is a high -energy -consuming device. The proportion of electricity resources consumed by the ventilator in stone processing is large. With the increasing shortage of energy in my country and the promotion and application of high yield and efficient working surfaces, energy saving and consumption reduction have become stone production The issues that enterprises generally pay attention to, many stone manufacturers have reduced the power consumption of the fan as the current important task. In addition to improving the efficiency of the fan itself, the power consumption of the fan is the most important to reasonably choose the adjustment method of the fan. Because the load of the stone production changes with the needs of the process, most
In centrifugal fans
The fans need to regulate the traffic frequently according to the host load. At present, the energy -saving adjustment method of stone processing enterprise fan is relatively old, and it is generally used for throttling. When the flow adjustment is adopted, the flow of the fan is mainly adjusted by the adjustment valve or the throttling baffle. The fans have a large daily flow, and even more than 50%during low load. Energy waste is very serious. And if the speed of regulating fan can not only cancel the losses of the node, but also ensure that the fan is always running in an high -efficiency area, so it can greatly save electricity. It can be said that the speed of adjusting the fan to run the fan is an effective way of energy saving, reflecting the new trend of the current production of building materials industry.
The development prospects
With the advancement of my country's industrialization process, the industrial industry is vigorously carrying out energy conservation and consumption reduction, industrial upgrading and integration and reorganization. Industrial basic equipment needs to be updated in large quantities. As an important supporting equipment for industry, centrifugal fan will be applied more in the fields of power, cement, petrochemical, coal, mines and environmental protection. Under the new economic development situation, the future centrifugal fan industry will continue to maintain rapid growth. It is estimated that by 2022, the market size of the centrifugal fan industry will reach 96 billion yuan.
The performance characteristics
In centrifugal fan is essentially a variable flow constant pressure device. When the speed is certain, the pressure-flow theoretical curve of the centrifugal fan should be a straight line. Due to internal losses, the actual characteristic curve is bent. The pressure generated in the centrifugal fan is greatly affected by changes in the temperature or density of the intake. For a given air intake amount, the highest air intake temperature (the lowest air density) is the lowest. For a given pressure and traffic characteristic curve, there is a power and traffic characteristic curve. At this time, for a given flow, the required power increases with the decrease in the temperature of the air.
The fault repair
On the wear of the transmission part of the centrifugal fan is a common equipment problem, including the fuel bearing Position, bearing room wear, winding machine bearing position, etc. In response to the above -mentioned faults of centrifugal fans, traditional maintenance methods include pile welding, heat spraying, brush ferry, etc., but there are certain disadvantages: the thermal stress generated by the high temperature of the replenishment of welding cannot be completely eliminated, which can easily cause material damage, resulting in bending or broken of the components; The plating of the appliance is limited by the thickness of the coating, and it is easy to peel off. The above two methods are fixed metal with metals. Damage again. In contemporary Western countries, the above issues mostly use the repair method of polymer composite materials, and the more applications are the American Fu Shilan technology system. It has super strong adhesion, excellent pressure resistance strength, etc. Processing. There is no supplementary welding thermal stress, and the thickness of the repair is not restricted. At the same time, the metal material that the product has not possessed the concession, the impact vibration of absorbing equipment, avoiding the possibility of re -wear It is also gradually replaced by traditional methods [2].
In centrifugal fans
Note
The shutdown procedures
1. Emergency stop: During the trial operation of the crew, one of the following situations should be immediately stopped. The operation of the emergency shutdown is to press the main motor parking button, and then perform the aftermath after the shutdown.
a, the centrifugal fan suddenly vibrated, and it has exceeded the card.
b, there are scratches or abnormal friction sound inside the body.
c, any bearing or sealing, smoke, or a certain bearing temperature rose sharply to the alarm value.
D, the oil pressure is lower than the alarm value and cannot return to normal.
e and fuel tank liquid levels are low, and there are already inhalation.
F, a shaft shift value has significantly continued to grow, when the alarm value is reached.
2, normal shutdown: The unit's normal shutdown is performed according to the following procedure.
a, gradually open the open valve (or export bypass valve), and gradually turn off the exhaust valve.
b, gradually turn off the small air festival door to 20-25 °.
c, press the parking button, and pay attention to the abnormal phenomenon during the shutdown process.
D, the unit stops 5 to 10 minutes, or the fuel supply can be stopped when the bearings temperature drops below 45 ° C. For units with floating rings, the sealing oil pump must continue to supply fuel until the body temperature is lower than 80 ° C.
After the unit stops, the rotor should be moved at 180 ° within 2 to 4 hours.
This centrifugal fan is very widely used, so you should master its principles so that it can work better. The centrifugal fan is based on the principle of the conversion of kinetic energy to potential energy. The impeller of high -speed rotation accelerates the gas, and then slows down and changes the flow, so that the kinetic energy is converted into potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the flow direction and the pipeline section area increases the ambassador's air flow deceleration. This deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure.
Forization
The working principle of the centrifugal fan is basically the same as the flat compressor, which are due to the low gas flow rate and the pressure change. Generally, the changes in the gas ratio of the gas are not needed, that is, the gas is used as the inaccessor. Compressed fluid treatment.
The centrifugal fan can be made into two types: right rotation and left -handed type. Focusing on the motor on the side of the motor: the impeller rotates when it goes smoothly, called the right rotary fan;
The constructor
In centrifugal fans consisting of cases, spindles, impeller, bearing transmission mechanism and motor.
Cases: It is made of strong and reliable from steel plates. It can be a split and semi -open type.
The impeller: consisting of blades, curve -type front plates and flat plates.
Rotor: Static balance and dynamic balance should be done to ensure smooth rotation and good performance.
The centrifugal fan is based on the principle of the conversion of kinetic energy to potential energy. The impeller of high -speed rotation is used to accelerate the gas, and then slow down and change the flow, so that the kinetic energy is converted into potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the direction of the flow caused by deceleration, and this deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure.
Corresponding fan is a mechanical energy that rely on input mechanical energy to improve gas pressure and exhaust gas. It is a kind of mobilized fluid machinery. Centrifugal fan is widely used in the ventilation, dust discharge and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and quotation of boilers and industrial furnaces; Ventilation; drying and selection of grains; wind and pads and pushing boat inflatable and promotion.
The centrifugal fan is based on the principle of the power conversion to potential energy. The high -speed rotating impeller accelerates the gas, and then slows down and changes to the potential energy (pressure). In a single -stage centrifugal fan, the gas enters the impeller from the axial direction. In the loader, the gas changes the flow direction and the pipeline section area increases the ambassador's air flow deceleration. This deceleration effect transforms kinetic energy into pressure energy. Increasing pressure occurs mainly in the impeller, followed by the transmission process. In multi -stage centrifugal fans, use a returner to make the airflow enter the next leaf wheel to generate higher pressure.
When the motor rotates, the impeller of the fan rotates. When the leaf wheels are rotated, the air is thrown out of the impeller, and the air is thrown out of the impeller and gathered in the case. Due to the slow speed and high pressure, the air is discharged from the ventilator exit into the pipeline. When the air in the impeller was discharged, negative pressure was formed, and the air outside the inhaled mouth was pressed into the impeller under the action of atmospheric pressure. Therefore, the leaf wheels are constantly rotating, and the air is continuously flowing in the pipeline under the influence of a ventilator.