Characteristics of centrifugal blowers, what are the characteristics of centrifugal fans?

Compared with piston refrigeration compressors, centrifugal refrigeration compressors have the following advantages:

1) The single machine has a large cooling capacity, and when the cooling capacity is the same, it has a small size, a small footprint, and a weight that is 5 8 times lighter than that of the piston type.

2) Because it does not have vulnerable parts such as steam valve piston rings and no crank connecting rod mechanism, it works reliably, runs smoothly, has low noise, simple operation and low maintenance cost.

3) There is no friction between the working wheel and the casing, no lubrication is required. Therefore, the refrigerant vapor does not come into contact with the lubricating oil, which improves the heat transfer performance of the evaporator and condenser.

4) It can adjust the refrigeration capacity economically and conveniently, and the range of adjustment is large.

5) The adaptability to the refrigerant is poor, and a centrifugal refrigeration compressor with a certain structure can only adapt to one refrigerant.

6) Because it is suitable to use refrigerants with relatively large molecular weight, it is only suitable for large refrigeration capacity, which is generally more than 25 300,000 kcal. If the refrigeration capacity is too small, then the flow rate is required to be small, and the flow channel is narrow, so that the flow resistance is large, and the efficiency is low. However, after continuous improvement in recent years, the centrifugal refrigeration compressor used for air conditioning can have a cooling capacity as small as about 100,000 kcal per hour.

The blower is mainly composed of six parts: motor, air filter, blower body, air chamber, base, and drip nozzle. The blower runs eccentrically on the rotor offset in the cylinder, and the volume change between the blades in the rotor groove sucks the air in, compresses, and expits it.

During operation, the pressure difference of the blower is used to automatically send lubrication to the drip nozzle and drip into the cylinder to reduce friction and noise, while keeping the gas in the cylinder from backflowing.

1. Centrifugal ventilator, good ventilation effect, centrifugal ventilator has good ventilation effect, very suitable for pipeline ventilation or air supply;

2. Strong applicability, centrifugal fan is a fan commonly used in the pipeline to transport air, and can be used in non-corrosive, flammable and explosive gas places.

3. Low noise, centrifugal fan adopts reasonable impeller angle design according to air flow mechanics, during operation, there is no mechanical friction, and reasonable blade shape line makes the noise reduce to low; The noise generated by centrifugal ventilators is high-frequency noise and can be insulated as long as there is an obstacle.

4. The centrifugal fan runs smoothly, the optimized design of the impeller reduces the axial force to a low degree, and there is an impeller, and the static and dynamic balance correction makes the whole machine run smoothly, and the bearing amplitude is relatively small without adding any vibration damping device.

5. Sturdy and durable, the casing and impeller are made of steel plates, which makes the fan more solid, and the surface of the whole machine is sprayed, which has strong oxidation resistance and is not easy to be corroded.

Maintenance of centrifugal fans:

1. The rotation direction of the fan should be consistent with the rotation direction noted on the nameplate of the fan.

2. Install a regulating valve on the air inlet pipe of the fan. Before starting, turn it off, wait for the fan to run, and then slowly turn it on until it reaches the specified working conditions, and detect the motor current.

3. Check the operation of the fan at any time, if any abnormal phenomenon is found, the cause should be found out in time and the machine should be stopped for maintenance.

4. Regularly remove dust, dirt and other impurities inside the fan and pipeline according to the specific conditions of use, and prevent corrosion.

5. Observe the temperature rise and lubrication of the bearing at any time, and keep the oil window clean and transparent.

6. The lubricating oil used in the fan should be replaced regularly, especially after each dismantling and repair.

Motor, commonly known as "motor motor", refers to an electromagnetic device that realizes the conversion or transmission of electrical energy according to the law of electromagnetic induction. It is a power device that converts electrical energy into mechanical energy; The fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas, and it is a driven fluid machine. Some fans are driven by motors, and some can be driven by engines.

Centrifugal fan, the wind pressure is not large. The compression of air is usually carried out by centrifugal force through several working impellers (or stages). Centrifugal fans belong to the square torque characteristic, while roots fans basically belong to the constant torque characteristic.

If the load requires a constant flow effect, use a roots blower. Because the roots blower belongs to the constant flow fan, the main parameter of the work is the air volume, and the output pressure changes with the change of the pipe and load, and the air volume changes very little.

The roots blower is a high-pressure blower, and the roots blower is a positive displacement blower, which conveys the air volume proportional to the number of revolutions, and transports the gas from the inhaled side to the discharged side. Because the centrifugal fan belongs to the constant pressure fan, the main parameter of the work is the wind pressure, and the output air volume changes with the change of the pipeline and load, and the wind pressure does not change much.

Roots blower generally speaking, the air volume is relatively large, the pressure is also relatively large, the same roots blower noise is also very large, if the air volume is relatively small, the noise requirements are relatively high, the rotary blower is selected, the rotary blower also belongs to the constant flow fan, the main parameter of the work is the air volume, the output pressure changes with the change of pipe and load, the air volume changes very little, the rotary fan is variable capacity compression, its main characteristics are: low speed, low noise, low vibration, high efficiency, high energy saving.

1. Centrifugal fan has good ventilation effect, and 4-72 centrifugal fan has good ventilation effect, which is very suitable for pipeline ventilation or air supply.

2. Strong applicability, 4-72 centrifugal fan is a fan commonly used in the pipeline to transport empty gas, and can be used in non-corrosive, flammable and explosive gas places.

3. Low noise, 4-72 centrifugal fan adopts reasonable impeller angle design according to air flow mechanics, and there is no mechanical friction during operation, and reasonable blade shape line makes the noise low; The noise generated by the 4-72 centrifugal fan is a high-frequency noise, and as long as there are obstacles, it can be soundproofed.

4. The centrifugal fan runs smoothly, the optimized design of the impeller reduces the axial force to a low degree, and there is an impeller, and the static and dynamic balance correction seepage talks, so that the whole machine runs smoothly, and the bearing amplitude is relatively small without adding any vibration reduction device.

5. The centrifugal fan has less maintenance, because its impeller adopts a backward tilting type, which is not easy to adhere to dust and other media, and the motor adopts imported bearings.

6. Easy maintenance, some models can be equipped with cleaning doors, no need to disassemble the machine for maintenance and cleaning, saving time and effort.

The centrifugal fan is essentially a variable flow constant pressure device. When the rotational speed is constant, the pressure-flow theory curve of the centrifugal fan should be a straight line. The actual characteristic curve is curved due to internal losses.

The pressure generated in a centrifugal fan is greatly affected by changes in inlet air temperature or density. For a given inlet volume, the pressure generated at the highest inlet temperature (the lowest air density) is the lowest. For a given pressure and flow profile, there is a power versus flow curve.

When the blower is running at a constant speed, the power required for a given flow rate increases as the inlet air temperature decreases. According to the principle of converting kinetic energy into potential energy, the centrifugal fan uses a high-speed rotating impeller to accelerate the gas, and then decelerates and changes the flow direction to convert kinetic energy into potential energy (pressure).In a single-stage centrifugal fan, the gas enters the impeller axially, changes to radial as it flows through the impeller, and then enters the diffuser.

In a diffuser, the gas changes the direction of flow causing a deceleration, which converts kinetic energy into pressure energy. The increase in pressure occurs mainly in the impeller and to a lesser extent in the expansion process. In a multi-stage centrifugal fan, a reflux is used to make the gas barbed flow into the next impeller to generate a higher pressure.

The working principle of centrifugal fan is basically the same as that of turbine compressor, all of which are due to the low gas flow rate and little change in pressure, and generally do not need to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid. The centrifugal fan can be made into two types: right-hand and left-hand. From the side of the motor, the impeller rotates clockwise, which is called the right-rotating fan, and the impeller rotates counterclockwise, which is called the left-rotating fan.

Hello, centrifugal blower side holes refer to some small holes opened on the side of the shell of the blower, and its functions are mainly in the following aspects: 1Exhaust:

The slow blower will generate a lot of heat and compressed air during the working process, and these exhaust gases can be discharged through the side holes to ensure the normal operation of the blower. 2.Cooling:

The blower will generate a lot of heat during the working process of the tung call mold, and the outside air can be introduced through the side holes to cool the blower and avoid damage due to overheating. 3.Lubrication:

The side bore can also be used to lubricate components such as bearings and gears of the blower to keep them functioning. 4.Noise cancellation:

A part of the noise can be emitted through the missing side holes of the chain to reduce the noise pollution of the blower. In short, the side holes of the centrifugal blower play a very important role in the normal operation of the blower, ensuring its normal operation and prolonging the service life.

Hello dear, happy to answer your questions Centrifugal blowers are often used to implement specific engineering requirements or to provide additional functionality. Here are a few common roles that side holes may have:1

Cooling: Side holes can be used to bring in external cooling gas or media to reduce the temperature of the blower. This is especially important for blowers that operate for long periods of time or in high-temperature environments.

By introducing cooling gas, the blower can be kept within a safe operating temperature range, extending its life and reliability. 2.Regulate the flow rate:

Side holes can be used to adjust the outlet air flow of the blower. By opening or closing the side holes, the flow of gas can be controlled, allowing for precise pin-free adjustment of the blower output. This is useful in applications that need to adjust the flow of depletion and dismantling in response to changes in specific needs.

3.Noise control: Side holes can be used to reduce the noise level generated by the blower.

By designing the side holes to specific shapes and sizes, the path and speed of gas flow can be changed, reducing noise generation. This helps to reduce noise pollution during blower operation, making it more suitable for noise-sensitive environments.