Main points of design for air duct system of air cooler

The evaporative cooler is used to deliver fresh air that has cooled down to the space, and then exhaust the poorer quality air in the space, and then reach the temperature of the lowered space to increase the freshness of the indoor air. Therefore, the cooling system of the air blower is usually closed in one way and one way out. The materials of its air duct are galvanized sheet, and in some cases glass fiber reinforced plastic and plastic air duct are also used.

Place the air outlet where the actual temperature needs to be reduced. The local planned air volume of the air outlet is the local required air volume for its temperature drop. The air outlet standard is determined based on the air volume and the speed of the air outlet. It is usually made of aluminum alloy. Finished products or other finished products such as wood can be selected in a variety of ways depending on the actual situation. Its type can be used in many ways depending on the actual situation, but it is best to use a DC-type four-sided blowing single-layer or double-layer louver; Conditioning valve to adjust air volume.

The standard of the air supply pipe is usually planned by the method of assuming the flow velocity. When planning, it is necessary to save money and make the noise and wind resistance smaller, and the air volume may be larger. Do not bend the air duct too much, so you can reduce the resistance, you can not use the local area of ​​the duct, you must use it, it must be shorter, the pipe is as straight as possible, do not have too many turns and branches, so It will be able to reduce the loss of some local resistance to the system pipeline. The air supply duct and the air conditioner should be connected with a soft receiver, and the air supply duct outside the room should be able to keep warm, and it doesn't matter inside.

If there is a branch pipe at the time of planning, it is necessary to place a valve or branch baffle on the branch pipe to adjust the air volume, so that its air volume and the request meet the planned parameters.

1. From a technical point of view, the power and cooling capacity of mobile coolers are basically the same as ordinary coolers. The difference is the design of air duct circulation. The air volume circulation of ordinary coolers is aimed at the indoor air circulation, while the mobile coolers reduce the indoor air temperature while sucking in fresh outdoor air to ensure the exchange with indoor air There will never be a "chiller disease". This fresh air duct design does not cause the indoor temperature to drop very low. In the case of an external temperature of 36 ° C, the indoor temperature is about 28 ° C, and the local temperature can reach 25 ° C. Consumers should be aware that the major feature of mobile air conditioners is that they can cool down in a local area when purchasing.

2. Because the mobile cooler is an integrated air conditioner, the noise is larger than that of ordinary air conditioners. With advanced noise reduction technology, TCL Delong has reduced the minimum noise of the machine to about 48 decibels, which is equivalent to the wind of a 2P cabinet. Main advantages 1. The cooling effect in the local area is faster than that of ordinary coolers. For example, to prevent overheating of computers, meters and other equipment, you can directly adjust the air outlet to the front direct blowing state to achieve the cooling effect.

3. It is not necessary to consider the location of the outdoor unit, as convenient as a fan, plug and play. For example, overtime workers in an office building only need to use hot air ducts to exhaust hot air to a distance and immediately have a cool space.

4. Equipped with Vientiane wheel, it can be moved to the place you want, which is more convenient and practical. For example: Whether it is a guest room or a kitchen, you can move as you like.

The functional parameters of general negative pressure fans mainly include flow, pressure, power, efficiency and speed. The ratio of the fan's effective power to the shaft power is called efficiency. Negative pressure fan is based on the cooling principle of air convection and negative pressure ventilation. From the opposite of the installation site-the door or window naturally inhales fresh air, and the sultry gas is forced out of the room quickly. Any poor ventilation can be improved. Machine, cooling and ventilation effect can reach 90% -97%.

For the size of noise and vibration is also the main fan design index. Flow is also called air volume, which is expressed by the volume of gas flowing through the fan per unit time. Pressure is also called wind pressure, which refers to the increase in the pressure of the gas in the fan, which is divided into static pressure, dynamic pressure and full pressure; The input power is the shaft power.

The development of fans will further improve the aerodynamic efficiency, device efficiency and use efficiency of fans to reduce power consumption; replace large centrifugal fans with axial flow fans with adjustable blades; reduce fan noise; improve smoke and dust exhaust fan impellers and casings Wear resistance; realize variable speed adjustment and automatic adjustment.

The classification of fans can be divided into centrifugal, axial flow, diagonal flow and cross flow types according to the direction of gas flow. Fans are divided into axial flow fans, centrifugal fans, and oblique flow (mixed flow) fans according to the flow direction of the airflow after entering the impeller. Fans are divided into pressure type local fans and explosion-proof electric motors placed outside or in the flow channels, and explosion-proof electric motors are withdrawable local fans placed in explosion-proof sealed chambers.

    For the negative pressure fan, what we will come to today is the analysis of the cause of its operating noise, and how to take necessary and effective measures for different reasons to solve it well, so that during the operation of the negative pressure fan To avoid this problem.

     

    The operation noise of negative pressure fan, and how to deal with it? For this question, the following Wuxi negative pressure fan manufacturer Hu Lin will give specific answers, so that everyone can thoroughly understand and master, so that they can be put to good use in practice.

     1. If the negative pressure fan is in contact with the window frame when it is installed too tightly, causing the window frame to resonate during operation, then its tightness or packing should be adjusted appropriately. For the bottom of the negative pressure fan, check whether it is stable. If it is not stable, then it is necessary to deal with it. In addition, the spring of the anchor bolt cannot be crushed to avoid problems.

     2. On the negative pressure fan base, the tightening degree of the damping pad or fixing screw is too high, so that it loses the vibration damping effect and generates vibration. At this time, the negative pressure fan base should be damped or fixed. Adjust the tightness of the screws to make them suitable, and restore the damping effect.

    3. The power supply voltage of the equipment is too low, so that the fan has abnormal noise or vibration. The solution is to control the power supply voltage within the rated range, and you can add a voltage regulator to stabilize the voltage. In addition, if there is collision or friction between the blades and the casing, this problem will also be caused. Therefore, the distance between the blades and the casing must be adjusted and controlled to avoid problems.

     4. In the negative pressure fan, if the impeller is not well assembled or the speed is too fast, it will also cause running noise. Therefore, to deal with it, the specific method is to reassemble the fan according to technical requirements, and adjust the speed of the impeller to make it within the appropriate range.