Direct drive negative pressure fan manufacturer, Shenzhen negative pressure ventilation fan equipment wholesale, Zhuhai

Description :

　　（1） Overview of Negative Pressure Fan

　　Negative pressure fan is a type of ventilation fan, belonging to axial flow fan, which is mainly used in negative pressure ventilation and cooling projects and is called negative pressure fan. The negative pressure ventilation cooling project includes both ventilation and cooling aspects, and solves both ventilation and cooling problems simultaneously. Negative pressure fans are also used in positive pressure water curtain environmental air conditioning, positive pressure air supply, positive pressure blowing and other fields. Negative pressure fans have the characteristics of large volume, ultra large air duct, ultra large blade diameter, ultra large exhaust volume, ultra-low energy consumption, low speed, and low noise.

　　（2） The principle of negative pressure fan

　　By utilizing the cooling principle of air convection and negative pressure ventilation, fresh air is naturally drawn in from the opposite side of the installation location - the door or window, and the hot and humid indoor gases are quickly forced out of the room. Any ventilation problems can be improved, and the cooling and ventilation effect can reach 90% -97%.

　　（3） Principle of negative pressure fan ventilation

　　The negative pressure fan exhausts air outward, causing the indoor air pressure to decrease and the indoor air to become thinner, forming a negative pressure zone. The air compensates for the pressure difference and flows into the room. In practical applications of industrial plants, negative pressure fans are centrally installed on one side of the plant, with the air inlet on the other side of the plant. Air flows through the air inlet to the negative pressure fan to form convective blowing. During this process, the doors and windows near the negative pressure fan remain closed, forcing air to flow into the workshop through the compensating doors and windows on the intake side. The air flows into the workshop in an orderly manner through the air inlet, passes through the workshop, and is discharged from the workshop by a negative pressure fan. Thorough and efficient ventilation, with a ventilation rate of up to 99%. Through specific engineering design and the design of ventilation rates and wind speeds as needed, any high heat, harmful gases, dust or smoke can be quickly discharged from the workshop, and any ventilation problems can be completely solved in one go. The ventilation effect can be achieved within a few seconds of turning on the fan.

　　（4） Principle of cooling by negative pressure fan

　　1Ventilation and cooling: Due to sunlight shining on buildings, machinery and equipment, human bodies and other heat sources, the temperature in places that require ventilation is higher than outdoors. The negative pressure fan can quickly exhaust indoor hot air, keeping the room temperature at the same level as the outside temperature, and preventing the temperature in the workshop from rising.

　　IIAir flow takes away human body heat, accelerates sweat evaporation and absorbs human body heat, making the human body feel cool, just like natural wind.

　　IIINegative pressure fans only have the function of ventilation and cooling, without cooling function. Coolness is the feeling of the human body. The statement about how much temperature a negative pressure fan can reduce is ignorant.

　　4、 When used in conjunction with a water curtain, the temperature in the workshop can be controlled within 28 degrees Celsius during hot summer days, and the cool feeling of the human body can be compared to air conditioning.

　　（5） Characteristics of Negative Pressure Fan Products

　　The whole machine adopts CAD/CAM design, which has the characteristics of low investment cost, large air volume, low noise, low energy consumption, stable operation, long service life, high efficiency, etc. The louvers automatically open and close to achieve dust and water resistance, and are beautiful and elegant; It can blow air and is an ideal choice for cooling and ventilation in modern factories, and can also be used for ventilation. Environmentally friendly and energy-saving negative pressure fans and cooling water curtains will become the mainstream of the ventilation and cooling equipment market

　　Performance characteristics:

　　The outer frame material is made of highly corrosion-resistant thick galvanized sheet

　　The outer frame is made using CNC machine tools, with advanced technology and extremely high precision

　　The wheel hub comes in two types: high-strength aluminum alloy and cast steel

　　New twisted stamping forming fan blades

　　Reasonable blade angle can achieve a large air flow rate

　　High precision microcomputer assisted manufacturing system can enable the fan to exert greater efficiency

　　Strict quality inspection procedures: noise detection, vibration detection, concentric performance detection, fan blade speed detection, and overall efficiency detection

　　High performance 380V three proof dedicated motor

　　◆ Two types of collectors are used: iron collectors and fiberglass collectors

　　The rear safety net is easy to disassemble

　　◆ CAD optimization design

　　Fan characteristics:

　　(1)Good quality: The negative pressure fan is a high-quality negative pressure fan produced by introducing German technology.

　　(II)Ultra durable: The negative pressure fan adopts heavy aluminum die-casting blades, which are resistant to high temperatures, do not age, and do not deform.

　　(3)Low investment: Negative pressure fans account for 1/5 of the total investment in central air conditioning, making them cost-effective for similar ventilation and cooling projects.

　　(IV)Ultra environmentally friendly: Negative pressure fan without compressor, refrigerant, pollution, and low noise.

　　(V)Very healthy: The negative pressure fan continuously provides fresh and clean air, increasing the oxygen content in the air.

　　(VI)Easy to install: Negative pressure fan is easy to install, requires minimal maintenance, easy to operate, and does not require professional maintenance

　　Structural features:

　　11P54 and F-grade aluminum/iron shell fan motors produced using advanced foreign technology. Long service life, smooth operation, low noise, and also has protection against under phase and overload.

　　IIRoot fluid mechanics (principles of airflow); Using CAD/CAM optimization design to manufacture blades with reasonable angles, air volume, and noise, using aviation die cast aluminum as the blade material, without aging or deformation, the matched motor is only 1.1KW.

　　IIIWe use the high-performance and effective multi V belt used in the automotive industry as the fan drive belt, and also use CNC machined drive pulleys to ensure good concentricity, smooth operation, extremely low noise, and no breakage.

　　4、 The TPI6206 bearing is used as the rotating bearing, and the bearing seat is precision machined by CNC to ensure good concentricity. The axis is externally polished to ensure concentricity and smoothness. This ensures the stability and durability of the entire bearing assembly's rotation.

　　Pneumatic louvers designed and manufactured using the principle of air flow, which do not require any energy, have automatic switches, and are dust-proof and rainproof

　　（6） Construction of negative pressure fan

　　The outer frame and blinds are both made of galvanized steel sheet molds

　　The fan blades are stamped and formed in one go, fastened with forged air screws, and calibrated by computer precision balancing

　　Low noise, high air volume, stable and reliable operation

　　The connection components of the blinds are made of high-strength plastic steel material, which is tightly closed and has a long service life

　　Motor 380V/220V optional

　　（7） Introduction to the Application of Negative Pressure Fans

　　oneUsed for ventilation and air exchangeInstalled outside the workshop window, it is generally recommended to choose a lower air outlet and draw air outward to extract odor gases; There are many applications in the fields of industry and agriculture.

　　twoUsed in conjunction with water curtains:Used for workshop cooling in hot summer, no matter how hot your workshop is, the water curtain+negative pressure fan system can lower the temperature of your workshop to around 30 ° C and provide a certain level of humidity.

　　threeScope of application of negative pressure fan:

　　ATheSuitable for high-temperature or odorous workshops such as heat treatment plants, casting plants, welding plants, plastic plants, aluminum profile plants, shoe factories, leather factories, electroplating plants, various chemical plants, etc.

　　BTheSuitable for labor-intensive enterprises such as clothing factories, various assembly workshops, and internet cafes.

　　CTheVentilation and cooling in horticultural greenhouses, and cooling in livestock farms.

　　DTheEspecially suitable for places that require cooling and a certain level of humidity. Various textile factories such as cotton mills, wool mills, linen mills, weaving mills, chemical fiber mills, warp knitting mills, elastic mills, knitting mills, silk mills, sock mills, etc.

　　ETheSuitable for the field of warehousing and logistics

　　fourUsed as an exhaust fan:At present, the efficiency of general exhaust fans (commonly known as Yanggu fans) is relatively poor. One exhaust fan can only blow a few people, while negative pressure fans are not. They can be used on the ground or hung in the air. Generally, a 1000 square meter workshop uses 6 units, which means that the entire room is blown by the wind.

　　（8） Reference for ventilation and air exchange in various places

　　oneTheThe general environmental requirement is a ventilation volume of 25-30 times per hour;

　　twoThePublic places with high pedestrian traffic require a ventilation rate of 30-40 times per hour;

　　threeTheProduction workshops with heating equipment require a ventilation rate of 40-50 times per hour;

　　fourTheHigh temperature and severely polluted production workshops require an air exchange rate of 50-60 times per hour.

　　fiveTheIn humid southern regions, the frequency of air exchange should be appropriately increased, while in hotter and drier northern regions, the frequency of air exchange can be appropriately reduced.

　　sixTheUsers can adjust their usage environment and design requirements accordingly.

　　（9） Calculation method for the number of fans:

　　Indoor total space (length x width x height) cubic meters x air exchange rate ÷ fan air volume

　　For example, a workshop with an area of 1000 square meters, a height of 9 meters, a designed air exchange rate of 50 times, and a TH-1380 fan with an air volume of 45000 cubic meters per hour. The required number of installed units is: area 1000 square meters x height 9 meters x 50 times ÷ 45000. The calculated result is 10 units. The meaning of returning is to install 10 TH-1380 fans to provide 50 air exchanges for a factory building with an area of 1000 square meters and a height of 9 meters.

　　（10） Selection of installation location for negative pressure fan host

　　（one）Overall, negative pressure fans should be installed in the middle of buildings to minimize the air supply resistance of ducts and shorten the length of installation pipelines; If possible, install the negative pressure fan in the dominant direction of the cooling environment;

　　（two）Negative pressure fans can be installed on walls, roofs, or outdoor floors, but the installation environment should ensure smooth and fresh air, especially should not be installed at exhaust outlets with odors or peculiar gases, such as toilets, kitchens, etc. If there are not enough doors or windows, specialized exhaust fans need to be installed, and the exhaust volume should ensure that it reaches 80% to 90% of the total air supply of the negative pressure fan;

　　（three）At the installation position of the negative pressure fan, it is necessary to ensure that its frame structure can support the weight of the entire negative pressure fan body, the air supply duct at the machine port, and the maintenance personnel.

　　（four）During installation, attention should be paid to sealing and waterproofing the pipes between indoor and outdoor areas to avoid rainwater leakage.

　　（five）If installed indoors. The air supply duct must be matched with the model of the negative pressure fan, and suitable air supply ducts should be designed according to the actual installation environment and the number of air outlets (longer ducts generally use variable diameter methods).

　　（six）Generally speaking, the designed pipeline should be as short as possible, and branches should be minimized to achieve low wind resistance and noise.

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