Positive pressure fan

Positive pressure fanThe energy-saving exhaust fan is designed using the meridian acceleration method and the "quasi three element" flow theory, and adopts a structural form of linear outer cylinder, conical hub, and twisted wing blades. The pressure is higher than that of the same axial flow fan, and the air volume is larger than that of the same centrifugal fan. It has the advantages of high efficiency, compact structure, low noise, small size, and easy installation, and is widely used in high-end civil buildings such as hotels, restaurants, shopping malls, office buildings, and sports centers for ventilation and air supply through pipelines, as well as ventilation and air exchange places in industrial and mining enterprises. The dual speed fan can adjust the required air volume and pressure through variable speed according to the requirements of the operating conditions.

For new types of fans developed for situations such as low air volume and low air pressure, mixed flow fans have a higher air volume than axial flow fansThe wind pressure is lower than that of centrifugal duct fans, and combining the advantages of two different specifications to achieve the ideal state, positive pressure air supply and negative pressure exhaust for ventilation ducts are good choices. Based on the "quasi three element" theory and the "meridian acceleration" design method, we have successfully developed a new type of fan with a specific speed between centrifugal and axial flow, a pressure coefficient higher than that of axial flow fans, and a flow system higher than that of centrifugal fans. Therefore, the user selection range is wider, the system matching is more reasonable, which is conducive to energy saving and noise reduction of the system. It is currently the most suitable new product for pipeline pressurization systems in ventilation fans.
Purpose:
This product is used in ventilation and air conditioning systems for industrial and civil buildings. Especially suitable for positive pressure air supply in pipelines.SWF（A）【HLF】-ⅠType can replace high flow fansSWF（A）【HLF】-ⅡThe SWF (A) [HLF] - III type can replace medium and high pressure centrifugal fans, with dual speed and dual use. It is designed for densely populated areas at high speeds and can supply and exhaust air to pipelines under normal conditions at low speeds. This wide fan is cheaper and consumes less electricity than centrifugal fans, greatly reducing operating costs and benefiting from the national promotion of low-carbon environmental protection
Structure and characteristics:
The basic structural type is that the inlet and outlet are on the same axis (i.e. horizontal inlet and outlet)The impeller hub is a conical cylinder, and the blades have unequal width shapes along the flow direction. There are three types of cylindrical shapes: straight cylindrical, drum shaped, and imported with curved mufflers, which provide scientific basis for the full transmission of air volume and pressure.
According to the principle of meridian acceleration of airflow, fans have dual characteristics of centrifugal and axial flow, with high pressure and large flow rate, as well as advantages such as high efficiency, low noise, and wide high-efficiency zone, which can effectively meet user requirements.
Compact structure, light weight, easy installation, and small footprint.
Installation and use:
Horizontal, vertical, and suspended ceiling can be installed. For floor installation, a shock absorption system needs to be added. For hoisting, a shock absorption hanger needs to be installed, which can effectively keep the fan horizontal during normal operation and reduce fan vibration.
This series of products can be used for exhaust, supply, and pipeline pressurization.
Fan usage, maintenance, and upkeep
1. Maintenance and upkeep.
A、 Before installation, carefully check whether the fan blades and casing are damaged or deformed due to transportation, otherwise they should be repaired before installation; B、 Check if the blades and air ducts have collided with the shell due to loose connecting screws. If the gap between the blades and air ducts is uneven, it should be adjusted before installation; C、 Before starting the fan, the first thing to check is whether there are any objects inside the fan and pipeline that hinder rotation; D、 Check whether the insulation performance of the motor is good, and after connecting the power, check for friction, collision, and abnormal vibration; E、 In normal operation, if the following situations occur, the machine should be stopped immediately for inspection: 1. The temperature rise of the motor exceeds 70 degrees Celsius; 2. Electric Changbai Smoke; 3. Strong vibration or loud magnetic noise occurs.
2. Analysis of common faults in fans: There are many reasons for fan vibration, which can be checked from the following aspects:
A、 The impeller rubs against the air duct and produces abnormal sounds and vibrations; B、 The bracket foot bolts are not tightened, which can also cause significant vibration; C、 The impeller vibrates due to compression deformation or bolt loosening during transportation; D、 Loose connection screws between the blade and the shaft sleeve or bending deformation of the main shaft, as well as loose connection screws between the bracket and the motor, can cause blade imbalance and bearing damage, resulting in severe vibration.
3. The motor is overheating. If the motor temperature rises too high after running at room temperature for a period of time, it may be caused by the following reasons:
A、 The motor bearings are damaged, and the fit clearance is small, which does not meet the requirements; B、 The installation of the shaft and bearings is skewed, and the two bearings have different axial degrees; C、 Excessive resistance and motor overload operation; D、 The power supply voltage is too low or the three-phase motor is running in phase loss. HLF (SWF) -4.5-5.5kw positive pressure mixed flow air supply fan, energy-saving exhaust fan:

The parameters are as follows: