It is normal for the cooling fan to make a small amount of noise during use. As long as we control the noise within a reasonable range, it will have no effect on the cooling fan. So what should be done if the noise exceeds the normal range under special circumstances? The following points are the methods to effectively reduce the noise of AC axial cooling fan:

1. System Impedance

The higher the impedance of the cooling system and exhaust fan, the more noise out of the normal range. The higher the system impedance, the greater the air flow required for cooling. Therefore, in order to minimize noise, the system impedance must be minimized.

2. Airflow interference

Turbulence caused by obstacles encountered in the airflow path can generate noise. Therefore, it is necessary to avoid any obstructions of the cooling fan, especially in the range of the air inlet and outlet, which can reduce the noise.

3. Temperature rise

In a system, the air volume required for cooling is inversely proportional to the allowable temperature rise. Therefore, if the limit on the allowable temperature rise is slightly relaxed, the noise can be reduced.

4. Voltage change

Voltage variations can affect cooling fan noise. The higher the cooling fan voltage, the greater the vibration and noise caused by the increased rotational speed. Therefore, if the air volume is suitable, try to choose a low-voltage cooling fan.

5. Fan size

Because the high rpm exhaust fan produces more noise than the low rpm exhaust fan, and when the air volume is the same, the large-sized low rpm exhaust fan is usually quieter than the small-sized high rpm exhaust fan. Therefore, when the noise requirements are higher, a larger size low rpm cooling fan can be selected.

If you are just looking for a 110v ac cooling fan manufacturer, then we are a good choice. Guangdong Chungfo Electronic Technology Co., Ltd. focuses on the cooling needs of equipment in various industries, specializing in the research and development and supply of cooling fans such as DC cooling fans, AC cooling fans and DC blowers.We can provide professional customization of cooling fans according to customer needs.

When the cabinet is running, it will generate a lot of heat. If it is not dissipated in time, it will cause the equipment to overheat and burn down or cause some wires to short-circuit. So when we install the cabinet, we usually install one or more cooling fans on the cabinet. Especially for cabinets with high efficiency and long service life, this can improve the cooling capacity of the cabinet. So how to install and choose the cabinet cooling fan? Please read on.

一、Fan installation

1. First of all, we need to determine the installation direction of the fan. The direction of the fan installation depends on whether your cabinet needs to take in the air or discharge the hot air in the cabinet to the outside. Generally speaking, the positive pressure in the cabinet should be maintained, so the air should be introduced into the cabinet. Because if the fan exhausts air outside the cabinet, it will cause negative pressure inside the cabinet, and the outside air will directly enter through the gaps in the cabinet door. This unfiltered air enters the cabinet directly, causing dust to build up inside the cabinet over time. However, the air entering the cabinet needs to be filtered by filter cotton, which can filter out the dust in the air, so as to avoid the failure caused by dust accumulation in the cabinet. Therefore, when installing the cooling fan of the cabinet, the positive pressure is better than the negative pressure, that is, the air intake into the cabinet is better.

2. We also need to clarify the opening position of the fan. When installing the fan, the positions of its air inlet and outlet also need to be carefully considered. Because hot air is less dense than cold air, the air flow in the cabinet will be from bottom to top. Therefore, under normal circumstances, the lower part of the front door or the side panel of the cabinet is used as the air inlet, and the upper part is used as the exhaust port. However, when the hotspots of some devices are on the top or side or the front door, the cabinet cannot open holes for fans. At this time, it is necessary to open a hole on the top, and the installation direction of the fan is to exhaust the air outside the cabinet, not to enter the cabinet.

二、Fan selection

1. Air volume. If the space in the cabinet is relatively large, we'd better choose a cooling fan with a larger air volume. Because the higher the speed, the greater the air volume of the fan, so we can choose a high rpm exhaust fan.

2. Power consumption. The greater the power consumption, the shorter the fan bearing life, so if the fan has met the customer's requirements in other aspects, try to choose a cooling fan with low power consumption.

3. Noise. The cooling fan tends to generate a lot of noise when it rotates at high speed. Therefore, you need to pay attention to the performance of the cooling fan when choosing to avoid excess performance and reduce unnecessary noise.

Guangdong Chungfo Electronic Technology Co., Ltd. is a professional cooling fan manufacturer dedicated to the equipment cooling needs of various industries. We can provide professional customization of cooling fans according to customer needs. If you have needs in this area, please feel free to contact us.

In general, the higher the fan speed, the greater the air volume. The cooling fan generates airflow by rotating the blades, and an increase in speed causes the blades to push more air per minute, and when more air can be pushed, the volume of air will also increase. So when customers pursue high air volume, they often choose high rpm exhaust fans.

(12038 DC fan is used as an example.)

It should be noted that although there is a positive correlation between speed and air volume, the relationship is not linear. In some cases, as the rotational speed increases, the increase in air volume may slow down. This is due to the influence of the fan's design and performance characteristics as well as hydrodynamic effects.

Hydrodynamic effects are physical phenomena and behaviors that occur when involving the movement of fluids, such as air. First of all, when the fan rotates, there will be resistance between the blade and the air, and the larger resistance will reduce the air volume, while the smaller resistance will increase the air volume. In addition, the shape and Angle of the fan blades also affect the pressure difference of the air, which in turn affects the size of the air volume.

Secondly, during the operation of the fan, the turbulence generated by the rotating blade will lead to the instability of the air flow, thus reducing the air volume. The shear layer will form higher and lower velocity airflow regions, which will also affect the distribution and size of the air volume.

In addition, the design of the import and export area, boundary layer effect and fan rotation will have an impact on the fan; And other factors of the cooling fan, such as blade design, blade number, fan diameter and motor power, will also affect the air volume.

Guangdong Chungfo Electronic Technology Co., Ltd. is dedicated to the equipment cooling needs of various industries, is a professional cooling fan manufacturer. If you are looking for axial cooling fans, cross flow cooling fans or other types of cooling fans, please feel free to contact us.

1. Brushless DC Motor (BLDC)

Advantages: The brushless design reduces energy loss and improves overall efficiency. Because there is no brush, the brushless motor has less wear and longer life. Smooth operation and low noise for applications requiring a quiet environment.

Disadvantage：High cost, the manufacturing process is complex, and the cost is higher than that of brushed motors.

Complex control circuits: Additional control circuits are required to manage motor operation.

2. Brush DC Motor (BDC)

Advantages: Simple manufacturing, relatively low cost. No need for complex control circuit, easy to drive directly.

Disadvantages: Brush and commutator wear faster, resulting in shorter life. Due to the contact between the brush and the commutator, the noise generated during operation is larger. High maintenance requirements: brushes need to be replaced regularly, increasing maintenance costs.

If you have the need to buy high rpm exhaust fan, mini exhaust fan Wholesale,high temp exhaust fan Wholesale, Chungfo company is your best choice. We offer high quality cooling fans to meet a variety of application scenarios. Please contact us for more details!