Why the speed of DC cooling fan slows down?

The speed of the cooling fan is determined by voltage, fan blade angle, diameter, number of fan blades, bearings, etc. So what is the reason why the cooling fan slows down?

The speed of the cooling fan is mainly determined by the structure and components of the fan itself, the bearing friction and the wind resistance of the inclination angle of the fan blade. If the air pressure of the cooling fan is not enough, the speed of the fan will also be affected.

1. The reason for the slow speed of DC cooling fan: first, check whether it has been used for too long. If it is not disassembled to clean the dust, there will be too much dust accumulation, which will make it difficult for the fan to rotate and slow down. It is recommended to clean regularly. Dust is very harmful to DC cooling fan.

2. The reason for the slow speed of DC cooling fan may also be the problem of power supply, so users can also consider replacing silent power supply or DC cooling fan. At present, there are many silent power supplies in the market, which can effectively reduce the power supply noise after strict testing. In addition, the DC cooling fan can be replaced better. The process of replacing the power fan is also very simple. The key is to pay attention to the connection between the fan and the power supply.

3. In addition, if the DC cooling fan is not installed and loosened during installation, the fan speed will also slow down. Therefore, it is recommended to be careful during installation and removal.

The definition of blower:

It is a general machine that converts the mechanical energy of the prime mover into gas energy and transports gas. In fact, the blower can not produce its own wind, it only uses electricity or the energy generated by the combustion engine oil to drive the fuselage's wind blades, produce wind by changing the air pressure, and change the direction of the wind, and fix the air supply in one direction.

The type of blower

Centrifugal blower

A centrifugal blower is a type of blower that accelerates and exhausts gas by centrifugal force. Its structure is simple, stable operation, suitable for conveying a large amount of gas and pressurization and other work.

Our company mainly produces and develops centrifugal blowers and DC blowers, and also produces some small blower fan. Although the application of our company's blower has been involved in many different fields, but still insist on the development of a variety of new features of the blower, such as this newly developed, specially used for household washing and drying integrated washing machine 15035 blower.

The main working principle of the general dryer is to generate power through electricity, diesel power, wind power, flammable material resources, etc., and heat the ambient air, which is transmitted to the surrounding through, and then achieve the appropriate temperature for dehumidification treatment. Under the action of the suction force of the blower, the fresh cold air outside becomes dry hot air after heat exchange with the heater directly through the air intake, and then it is discharged from the body after heat exchange with the clothes rolling in the drum, and the clothes in the drum, the water gradually evaporates and dries under the action of dry hot air.

The special feature of this model 15035 blower is that on this basis, the sealing ring is added, and the pot-sealing glue is added in the stator, which greatly enhances its water resistance, so that the blower is better protected and the service life of the dryer is guaranteed. This product is developed according to customer requirements. Our company has its own factory specializing in R & D and production, which includes R & D team, laboratory, sample group, injection molding workshop and assembly workshop. Therefore, from the production of fan blades, fan frames, fan assembly to the final packing and packing, our company handles all the steps by hand, and every step is strictly controlled. The quality of the products is very guaranteed. Welcome to consult!

Many home appliances need heat dissipation during use, so cooling fans are usually installed to achieve the purpose of heat dissipation. In the process of using home appliance industry cooling fan, fan bearings play a decisive role in the service life, noise and reliability of cooling fans. According to the fan bearing, it can be divided into oil bearing exhaust fan and ball bearing exhaust fan. The price of oil bearing fans is relatively low, but oil bearings are dragging friction. In long-term use, the lubricating oil is used faster, so the bearings are more likely to be broken, and there will be loud noises in the middle and late stages. The ball bearing belongs to the rolling friction, which has the characteristics of high efficiency, low heat generation, small friction coefficient and small damage. Therefore, the service life is generally longer. With the development of the home appliance industry, oil bearing fans have been unable to meet its heat dissipation requirements, so ball bearing fans have gradually become the mainstream of home appliance industry cooling fan today.

 

During the production and processing of cooling fan bearings, the key stages of quality include the production and manufacture of bearing steel balls, the use of refined oil, cleaning during processing, the application of aerospace-grade stainless steel plates, and high-precision assembly lines. Since the bearing has a great influence on the cooling fan, it is particularly important to control the quality of the bearing.

 

In addition, high-quality bearings and fake and inferior bearings do not look very different in appearance, but their technological content cannot be compared. The significant technical differences in the production process of the two bearings can be reflected through the analysis and comparison of the bearing preload characteristics. Preloading refers to the entire process of fixing the balls into the bearing sleeve, which stipulates that the balls are inseparable from the surface of the bearing sleeve, and there is no play. Whereas in inferior bearing manufacture, the left and right bearing sleeves are directly aligned before preloading. There is no doubt that there will be some deviation between the steel ball specification and the bearing sleeve specification, so after preloading the bracket bearing, there will always be 5-10 gaps between the ball and the bearing sleeve, which greatly increases the degree of embrittlement damage, Reduced bearing life. In the same overall process, when high-quality bearings are produced and manufactured, the relative spacing between the left and right bearing sleeves during preloading is 5 microns, so that the bearing sleeves will firmly lock the balls after being stressed, thereby reducing the clearance to zero. In this way, during the operation of the fan, the balls are not easy to vibrate, thereby minimizing the damage and ensuring the stable and long-term high-speed operation of the cooling fan.

 

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.

The cooling fan blade is an important part of the cooling fan, which affects the performance and parameters of the cooling fan. These fan blades are usually made of plastic or metal materials, and generally consist of a plurality of fan blades. When the fan is running, the blades create airflow, which helps cool objects. Next, let's take a deeper look at the fan blades of cooling fans from three aspects.

1. The role of fan blades

The role of the cooling fan blade is to help the radiator to send heat to the environment, so that the device can be kept in an appropriate temperature range. The cooling fan consists of a motor and a set of fan blades. When the motor is running, the fan blades will rotate to remove heat from the radiator. This helps protect devices from overheating damage and maintains them in proper working order.

2. The material of the fan blade

Cooling fan blades are usually made of lightweight heat-resistant materials, such as plastic, aluminum alloy cellulose board, etc. These materials conduct heat efficiently and can be rotated at high speeds without damage while in operation. In addition, they have good insulating properties and can prevent electrical short circuits. Fan blades made of plastic are light, wear-resistant, and corrosion-resistant, and are usually used in household appliance cooling fans.

3. Performance of fan blade

The performance of cooling fan blades depends on factors such as the material, size and shape of the blades. Generally speaking, the more complex the shape of the fan blade, the better the heat dissipation performance. In addition, the size of the fan blade will also affect the heat dissipation performance. Generally speaking, the larger the fan blades, the better the cooling effect, but this also means that the fan will be larger, heavier, and will take up more space. Therefore, when selecting a cooling fan, various factors need to be considered in order to select a cooling fan with the most suitable number of blades according to actual needs.

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.

The cross flow cooling fan impeller is multi blade type. The shape is long cylindrical, with front multi wing blades. When the impeller rotates, the air flow enters the blade column from where the impeller is opened. The volute is discharged from the blade column on the other side through the impeller to form the working air flow. This is a brief introduction and working principle of the cross flow fan. Next, let's understand the characteristics and application fields of the lower cross flow fan.

Features of cross flow fan:

1. The cross flow cooling fan uses a long barrel fan impeller to work, and the diameter of the barrel fan blades is relatively large. Because of the large diameter, on the basis of ensuring the overall air circulation, a relatively low speed can be used to reduce the noise caused by high-speed operation.

2. The cross flow fan blades have been carefully designed to make the distance between the blades disorderly, presenting a situation of "unequal spacing". This irregular distance phenomenon can make the audio produced by the wind wheel and the air irregular, thus becoming a piece of wind noise rather than a noise concentrated on a certain audio segment. Obviously, this broadband noise is close to the state of nature, so it will not sound so upset.

3. Considering that the whole blade of cross flow fan is not in a straight line, but is sagging in the middle. If inferior materials are used to manufacture the fan blades, although it can help enterprises reduce costs, obvious deformation is likely to occur. In this case, it can be imagined that the noise of drooping fan blades during high-speed operation is terrible, and will also lead to extremely obvious vibration.

There are many types of cross flow fans on the market, such as DC cross flow fans and AC cross flow fans. Cross flow cooling fans are also widely used in air purifiers, wine coolers, fireplaces, refrigerators, solariums, subways, combine harvesters and other equipment.

If you are looking for mini cross flow fan wholesale, please feel free to contact us.

With the advent of the industrial era, the number of factories is increasing, the purchase of more and more mechanical equipment, but to extend the use of mechanical equipment, it is necessary to heat it, then with the application and environmental temperature changes, the need for different speed of the cooling fan to meet the heat dissipation needs of the equipment. The normal operation of the cooling fan is crucial to the stability and security of the device. So do you know how to deal with the common faults of cooling fans? The following lists several common faults of DC cooling fans and AC cooling fans and the corresponding solutions:

1.Abnormal sound:

(1) The fan suddenly makes noisy noise

Reason: This is usually because the lubricating oil of the fan is dry, or the fan is dusty.

Measures: As long as the heat pipe radiator and the fan are separated, the fan is cleaned up, and a little lubricating oil can solve the problem.

(2) Abnormal sound When rotating, you can occasionally hear some small collision sound

Cause: The chassis is covered with messy data cables and power cables. The cable ends touch the blades of the DC cooling fan, causing abnormal sound when the fan rotates.

Measures: You can use rubber bands, adhesive paper, etc. to tie the scattered data cable power cord in the chassis to avoid passing over the cooling fan.

2.The cooling fan automatically offsets the position

Reason: The buckle fixing the radiator fails, and the resonance phenomenon caused by operation leads to the displacement of the fan

Measure: Replace the new buckle

3. The rotation is not smooth

Reason: The speed of the cooling fan is slow when it is just started, and it can be restored to normal after a short period of time. Due to the low indoor temperature of the cooling fan, it is easy to lose the effect of the lubricating oil on the rotating bearing.

Measures: Add antifreeze lubricating oil to the cooling fan, and pay attention to the temperature of the surrounding environment when using.

4. Overload protection trigger

Cause: After long-term operation, the cooling fan may be triggered by overload protection. The reason for the protection trigger may be that the power output voltage is too high or the fan load is too large.

Measure: Reduce the load on the fan and ensure that the load is within the rated load range of the fan. If the output voltage of the power supply is too high, replace or repair the power supply.

5. The controller is faulty

Cause: Some advanced AC cooling fans have a circuit controller, if the controller fails, the controller line is damaged, the controller chip is faulty, the fan can not work properly.

Measures: Check whether the controller circuit and chip are damaged, and repair or replace the controller. If it is a line fault, you can rectify the fault by checking that the line is properly connected or testing the line using a multimeter. If the chip is faulty, professional equipment needs to be used to detect and repair the chip.

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

Forward bent impeller, back bent impeller and radial impeller are all common drum designs in centrifugal fans, and they have some differences in performance, efficiency and application. Here is a comparison between the three types of impellers:

 

 

1,Forward-bent impeller: The installation direction of the blade is consistent with the rotation direction of the impeller, which is a forward-bent impeller.

The characteristics of the forward curved impeller are simply that the blade is narrow and small, and the outlet wind pressure is high. Front curved blade drums generally produce lower noise levels than back curved blade drums. Because the forward-bent blade reduces the impact and eddy noise of air passing through the blade, it may be more appropriate in some noise-sensitive applications.

 

2, Backbent impeller: its obvious feature is that the installation direction is opposite to the rotation direction of the impeller. The backward-bent impeller has high speed, large air volume and low pressure, but high efficiency. The efficiency of the centrifugal fan with the backward impeller in China can reach 80%-90%, which is widely used, and is not easy to scale and overload. Front curved blade drums generally produce lower noise levels than back curved blade drums. Because the forward-bent blade reduces the impact and eddy noise of air passing through the blade, it may be more appropriate in some noise-sensitive applications.

 

3,Radial impeller: The outside extension of the blade is at a 90 degree Angle to the tangent line of the direction of rotation of the blade, that is, the radial impeller. The performance of radial impeller is between the front bending type and the back bending type, and also has its characteristics of not easy to scale, so it is used in mine and other occasions.

 

 

 

 

 

It is important to note that the specific drum design chosen is evaluated based on your specific application needs and operating conditions. It is recommended to consult a professional centrifugal fan manufacturer or supplier when purchasing centrifugal fans to get the best advice for your specific application. Guangdong Chungfo Electronic Technology company is a wholesale DC centrifugal fan manufacturer, whether it is dc centrifugal fan, dc cooling centrifugal fan, or centrifugal cooling fan we have, welcome major buyers to come to purchase consultation.

 

 

 

 

 

 

Centrifugal fans have many advantages, but there are also some disadvantages. The following are the disadvantages of several common centrifugal fans:

(1) Noise: Centrifugal fans will produce higher noise levels at high speed. This is caused by the friction and compression between the impeller and the air when rotating.

(2) Size: Centrifugal fans are usually larger than axial fans with the same air volume. This is because the centrifugal fan needs to have a rotating impeller and a long inlet and outlet air duct. Therefore, in applications where space is limited, size limitations may need to be considered.

(3) Pressure characteristics: the wind pressure characteristics of the centrifugal fan are relatively gentle at the working point, and when the working point deviates from the design point, the change of wind pressure and air volume may be larger. This can be a challenge in some applications where precise wind pressure control is required.

(4) Energy efficiency: The energy efficiency of centrifugal fans is usually low. Due to the large volume and process design limitations, the aerodynamic efficiency of centrifugal fans is lower than that of axial flow fans. Therefore, in applications with high energy efficiency requirements, it may be necessary to consider other types of fans or take energy efficiency improvement measures.

 

Despite these drawbacks, centrifugal fans are still one of the most commonly used fan types in many industrial and commercial applications, as centrifugal fans typically have a higher air volume, higher pressure, higher reliability, and a wide range of adaptability.

Guangdong Chungfo Electronic Technology Company is a wholesale DC centrifugal fan manufacturer, there are 12v centrifugal fans, 24v centrifugal fans, like 6015 this type of centrifugal fan is also often used in air purifiers. In addition, some quiet centrifugal fans and plastic centrifugal fans will be produced, and the quiet centrifugal fans are especially suitable for medical atomizers because of their low noise, which provides a guarantee for users who need a quiet environment. We have many years of experience in the production of centrifugal fans, excellent quality, first-class service, welcome major buyers to come to purchase consultation.

Want to know what makes an air-cooled refrigerator special? Don't worry, today we're going to focus on a component that can't be ignored: the cooling fan. In fact, cooling fans play a crucial role in air-cooled refrigerators, and they have some compelling special designs and features, so let's take a look.

First of all, the location of the cooling fan deserves attention. They are usually located on the back of the refrigerator and are closely connected to the condenser. The choice of this location is not accidental, as it is able to effectively expel the generated heat, ensuring that the inside of the refrigerator maintains the proper temperature. This design improves the cooling effect while avoiding problems caused by overheating.

Secondly, the design and materials used in the cooling fan are also very special. They usually consist of efficient fan blades and a main air lead. Just like Chungfo's design and production of blades capable of low noise output high air volume, these fan blades are specifically designed to produce a strong airflow to provide sufficient cooling effect. The selection of materials takes into account the impact of long-term operation and low temperature environment on the fan, so that it can work in difficult conditions for more than five years without trouble.

Finally, the cooling fan also has intelligent control and adjustable functions. Some modern air coolers are equipped with intelligent control systems that can automatically adjust according to the temperature and load in the refrigerator. This means that the cooling fan can automatically start and stop as needed to work more efficiently. This feature helps to save energy and extend the life of the fan. The PCB board of the cooling fan produced by us is almost assembled by a professional technical team of workers, so when the customer requires the fan to have a self-starting function, TC temperature control function, RD alarm signal and so on, we can meet. And our company has many models of cooling fans are used in the refrigerator, such as D09232 this model of DC fan is the classic model of refrigerator application, most of the well-known refrigerator factories will use.

In general, the cooling fan in the air-cooled refrigerator has many special features. From the selection of their location, to the choice of design and materials, to the application of intelligent control and adjustable functions, these fans make an important contribution to the performance and effectiveness of the refrigerator. Guangdong Chungfo Electronic Technology Co., Ltd. is dedicated to the equipment cooling needs of various industries, is a professional cooling fan manufacturer. We can provide professional customization of cooling fans according to customer needs. If you have this need, please feel free to contact us.

In the selection of fans, the strength of heat dissipation performance is one of the indispensable considerations. So what are the factors that determine the strength of the fan heat dissipation performance?

There are mainly three points: air volume, wind pressure and heat dissipation structure.

 

Air volume: Air volume refers to the amount of air blown by the cooling fan per unit time, usually expressed in cubic meters per hour (m³/h) or cubic feet per minute (CFM). The larger air volume means that the fan is able to take away more hot air, which provides better heat dissipation.

Our company has a very strong cooling performance of AC brushless cooling fan, first of all, the size of the A17051B fan, which means a larger blade area and a larger wind output, such a design can produce more air flow per unit time, so as to provide greater air volume; In the design of the shape of the fan blade, the feather-shaped fan blade is selected, which can effectively inhale and discharge the air, generate greater thrust, and thus provide higher air volume. In addition, this form of blade flow is large, low noise, which is more in line with the principle of fluid mechanics. Although this fan has no ventilation hole, the reasonable housing design realizes the flow of air and better meets the heat dissipation needs. In general, large size, efficient design fans will usually provide greater air volume. Just like the A17051B, this fan has all the above conditions, so the air volume can be as large as 187.93CFM.

 

 

 

Wind pressure: Wind pressure refers to the ability of the cooling fan to generate wind power, mainly used to overcome resistance and push air through the radiator or cooling structure. The cooling fan needs to overcome the resistance in the radiator to ensure that the air can efficiently pass through the cooling structure, thereby carrying away the heat.

 

Heat dissipation structure: The heat dissipation structure refers to the heat sink or heat dissipation device used in conjunction with the heat dissipation fan. Its design and structure determine how heat is distributed and dissipated in the radiator. In fact, axial flow fans and centrifugal fans can also be used as part of the radiator to increase air flow and enhance the heat dissipation effect.Axial flow fans are relatively large, relatively simple structure design, suitable for products with simple structure and flow path design; The centrifugal fan has relatively large wind pressure, which is suitable for products with relatively complex structural design and flow path design.

 

Therefore, the air volume, wind pressure and heat dissipation structure of the cooling fan are related to each other. A cooling fan with a proper cooling structure can provide a larger air volume and wind pressure, providing better cooling effects for the cooling device. When choosing a cooling fan, these factors need to be considered comprehensively to meet the specific heat dissipation requirements.