Air-Flow Centrifugal Draft Fan with Advanced Manufacture Technology and Competitive Price

• Customization: Available
• Material: Iron
• Usage: for Experiment, for Air Conditioner, for Manufacture, for Refrigerate
• Model NO.: DKT350
• Pressure: High Pressure
• Certification: RoHS, UR, ISO, CE, CCC, Saber
• Color/Design: Customized
• Application: Industrial Construction
• Performance: Low Noise Fan
• Warranty: 1year
• Product Name: Centrifugal Draft Fan
• Key Words: Air Conditioner
• Power: 3.0kw 4pH
• Wind Flow: 5300-7500m3/H
• Pressure(PA): 405-425PA
• Noise: ≤75 Dba
• Transport Package: Wooden Case
• Specification: DKT SERIES
• Trademark: JIAYI
• Origin: Wenling, China
• HS Code: 8414599050
• Production Capacity: 800000pieces/Month

Product Description

Product Description

Air-flow centrifugal draft fan with advanced manufacture technology and competitive price

Centrifugal fans are apparatuses that draw in air and expel it in another direction. They use impellers to suck in air, gasses, smells, and other airborne particles and use propelling blades to blow and disperse air to a different area. Centrifugal fans are typically rounded in shape with an intake on one side and a blowing vent on an adjacent face. Given their design, they are often colloquially called snail fans.

Centrifugal blower fans are usually found in factories or other industrial settings as they serve more heavy duty purposes. Some appliances may have a self-contained centrifugal fan to aid with cooling or exhaust, though there are stand alone models that can be moved around to distribute air from a particular area. Other times they are part of an air duct system where air is passed through a centrifugal exhaust fan.
Jiayi carries centrifugal fans in a wide range of sizes and speeds to fit any job requirement.

The single inlet centrifugal fan has an airflow of 920m³/h (for 50Hz) at a fan speed of 1700rpm and has a supply voltage rating of 230VAC. This centrifugal blower is integrated within the impeller that reduces installation dimensions. The fan is featured with forwarding curved blades. It is an ideal solution for a wide range of applications and also suitable for intake suction use. The scroll housing is open on both the sides for added efficiency and reduction in noise level. The robust and space-saving design, this makes it versatile and easy to use.
It is 283mm long, 125mm wide and 261mm deep.

Note
To prevent overloading the motor, these blowers must be operated against the minimum static pressures.

Features and Benefits
Electronically commutated motor blower with an external rotor motor.
Impeller material is made from sheet steel and coated in black
Housing material IS die-cast aluminium
Direction of rotation is clockwise, as seen on rotor
Insulation class B
Mounting position of shaft is horizontal or rotor on bottom
Bearings are maintenance-free ball bearings
Motor protection 'top' wired internally
With housing (flange)

Product Parameters

 

No.	Model		Power(KW-P)	Wind Flow(m3/h)	Pressure(Pa)	Noise (Db(a))
2	11-45	DKT200	0.25-4	900-1500	315-295	≤64
2.25	10-63	DKT225	0.45-4	2300-2900	325-300	≤66
2.5	12-45	DKT250	0.75-4	2100-3000	515-475	≤64
	8-34		0.75-4	1800-2600	550-450	≤64
	12-58		0.85-4	2500-4000	400-270	≤67
2.8	10-60	DKT280	1.1-4	2600-4600	490-420	≤69
	9-67	DKT280	0.55-6	2100-3600	270-190	≤64
3	9-56	DKT300	1.8-4	3800-5500	620-600	≤72
	9-57		2.2-4	4300-6500	720-700	≤72
	16-47		1.1-6	3100-5100	425-405	≤67
3.5	11-48	DKT350	3.0-4	5300-7500	425-405	≤75
	10-48		1.5-6	3100-6100	355-330	≤68
4	12-45	DKT400	3.0-6	5100-9100	610-590	≤72
4.5	15-42		5.5-6	7500-13000	850-800	≤77
	11-68		7.5-6	13000-19000	750-700	≤78
	13-42		4.0-6	5600-11000	800-750	≤75

Installation Instructions

Feature

Max. Ambient Temp: <130ºC
Relative humidity: ≤98%
Rated voltage: 220V, 220/440V, 220/380/660V, 230/400/690V, 240/415/720V
Cooling Method: IC411, Protection Class: IP54/IP55
Insulation Class: Class B(130ºC), Class F(155ºC), Class H(180ºC)
Fan Blade: carbon steel and stainless steel
Motor: Single speed/Double speed Motor/ Explosion-proof Motor
Frame: carbon steel 

1. Good looking: The fan body be stamp by precise mould with Power coating;
2. Centrifugal fan with forwardward curved impeller;
3. Compact structure, various size for option, easy for installation;
4. Using standard size for the inlet and outlet, it coule be connect with tubing directely;
5. Using extenal rotor motor, extremely low noise.
6. Application: Where needs air ventilation, such as Hotel, Meeting room, Restaurant,Station, Supermarket, Airport, ect...
7. Durable external rotor motor with thermal link, Matching speed-controllers is available.

Detailed Photos

After Sales Service

Our service:
 Marketing Service
100% tested CE certified blowers.Professional advice for model selection and further market development.

Pre-sales service: 
•We are a sales team, with all technical support from engineer team.
•We value every inquiry sent to us, ensure quick competitive offer within 24 hours.
•We cooperate with customer to design and develop the new products. Provide all necessary document.

After-sales service:
•We respect your feed back after receive the fan.
•We provide 1years warranty after receipt of fan..
•We promise all spare parts available in lifetime use.
•We loge your complain within 24 hours.

1. SAFETY REGULATIONS AND NOTES
Please read these operating instructions carefully before starting to work with the device. Observe the following warnings to prevent malfunctions or physical damage to both property and people. These operating instructions are to be regarded as part of this device. If the device is sold or transferred, the operating instructions must
accompany it. These operating instructions may be duplicated and forwarded for
information about potential dangers and their prevention.

1.1 Levels of hazard warnings
These operating instructions use the following hazard levels to indicate potentially hazardous situations and important safety regulations:
DANGER
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Compliance with the measures is mandatory.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Exercise extreme caution while working.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or damage of property.
NOTE
A potentially harmful situation can occur and, if not avoided, can lead to property damage.
1.2 Staff qualification
The device may only be transported, unpacked, installed, operated, maintained and otherwise used by abled, qualified, trained and authorised technical staff. Only authorised specialists are permitted to install the device, to carry out a test run and to perform work on the electrical installation.
1.3 Basic safety rules
Any safety hazards stemming from the device must be re-evaluated once it is installed in the end device. Observe the following when working on the unit: Do not make any modifications, additions or conversions to the device without the approval.
1.4 Electrical voltage
Check the electrical equipment of the device at regular intervals, refer to Safety test. Replace loose connections and defective cables immediately

Company Profile

Zhejiang Jiayi Fan Co., Ltd. was established in 2003. It is a modern private enterprise focusing on the research, development, production and sales of ventilation equipment. The company is headquartered in Daxi Town, Wenling City, Zhejiang Province, which is the "Hometown of Pumps in China", and has branches across the country; the production base is located in the East New District of Wenling City.

Enterprise development strategy: The company has always regarded quality as the fundamental, with integrity as the criterion, to create high-quality, cost-effective ventilation equipment products for users is the goal pursued by companies A and B.

The main products of the company: all kinds of portable, mobile, oil-proof and moisture-proof axial flow fan series; medium, low and high pressure centrifugal fan series; boiler type draft fan series; mixed flow, diagonal flow fan series; industrial exhaust fan series; blower series and Y series; air compressor series and three-phase asynchronous motor, etc.; and can design and produce various non-standard and special exhaust equipment and special fans according to customer requirements.

Sincerely thank domestic and foreign customers for their long-term trust and love for A and B fans, and welcome you to visit and guide us at any time. With your support, we are more confident to manufacture ventilation equipment products that meet the needs of social development. Let us work together, help each other, coexist and prosper, and create unlimited business opportunities

FAQ

Q1: What's the terms of trade?

A1: FOB,CFR,CIF or EXW are all acceptable.

Q2: What's the terms of payment?

A2: T/T,L/C at sight or cash.

Q3: How long is your delivery time?

A3: Generally it is 5-10 days if the goods are in stock or it is 20-30 days if the goods are not in stock, it is according to quantity.

Q4: What is the advantage about your company?

A4: Our company has professional team and professional production line.

Q5: If we travel to China to checking your facility, are you welcome?

A5: Of course,  We will provide the whole accompany upon your arrivial. Warm Welcome!

Q6: How Many Years of your company working in this industry?

A6: We have over 20-year experience in this field.

News 
How Centrifugal Fans Work
Understanding centrifugal fans is a lesson in physics. The centrifugal fan's impeller blades draw air by creating a vortex. The air that is sucked into the impeller blades continues to rotate now around the center of the fan and pushes outwards inside the fan duct until the air is shot out of the exhaust vent. This phenomenon is called centrifugal force, hence the name of the fan.

The speed and power of airflow are measured in cubic feet per minute, or CFM. Fans are often categorized by CFM as engineers will know how much power their system needs. Higher speed fans are often referred to as blower fans.

The main parts of a centrifugal fan are:
1) Fan housing
2) Impellers
3) Inlet and outlet ducts
4) Drive shaft
5) Drive mechanism
6) Fan Dampers and Vanes
7) Inlet and outlet ducts
8) Fan blades
9) Fan discharge casing
10) Other components used may include bearings, couplings, impeller locking device, fan discharge casing, shaft seal plates etc.

Drive mechanisms
The fan drive determines the speed of the fan wheel (impeller) and the extent to which this speed can be varied. There are two basic types of fan drives.

Direct
The fan wheel can be linked directly to the shaft of an electric motor. This means that the fan wheel speed is identical to the motor's rotational speed. Direct drive is the most efficient form of fan drive since there are no losses converting from the motors rotational speed to the fan's. Some electronics manufacturers have made centrifugal fans with external rotor motors (the stator is inside the rotor), and the rotor is directly mounted on the fan wheel (impeller).

Belt
A set of sheaves is mounted on the motor shaft and the fan wheel shaft, and a belt transmits the mechanical energy from the motor to the fan. The fan wheel speed depends upon the ratio of the diameter of the motor sheave to the diameter of the fan wheel sheave. Fan wheel speeds in belt-driven fans are fixed unless the belt(s) slip. Belt slippage can reduce the fan wheel speed by several hundred revolutions per minute (RPM). Belts also introduce an additional maintenance item

Bearings
Bearings are an important part of a fan. Sleeve-ring bearings are used for smaller fans such as computer fans, while larger residential and commercial applications use ball bearings. Industrial applications may used specialized bearings such as water-cooled sleeve bearings for exhausting hot gasses. Many turbo blowers use either an air bearing or a magnetic bearing.

Speed control
Fan speed for modern fans is done through Variable Frequency Drives that directly control the motors speed, ramping up and down the speed of the motor to different airflows. The amount of air moved is non-linear with the motor speed, and must be individually balanced for each fan installation. Typically this is done at time of install by testing and balancing contractors, although some modern systems directly monitor airflow with instruments near the outlet, and can use the feedback to vary the motor speed.
Older fan installations would use inlet or outlet vanes - metal flaps that could be adjusted open and closed on the outlet of the fan. As the vanes closed they would raise the pressure and lower the airflow from the fan. This is less efficient than a VFD, as the VFD directly reduces electricity used by the fan motor, while vanes worked with a constant motor speed.

Fan blades
The fan wheel consists of a hub with a number of fan blades attached. The fan blades on the hub can be arranged in three different ways: forward-curved, backward-curved or radial.

Forward-curved
Forward-curved blades in a household fan Forward-curved blades, curve in the direction of the fan wheel's rotation. These are especially sensitive to particulates and commonly are only specified for clean-air applications such as air conditioning. Forward-curved fans are typically used in applications where the static pressure is too high for a vane axial fan or the smaller size of a centrifugal fan is required, but the noise characteristics of a backwards curved fan are disruptive for the space. They are capable of providing lower air flow with a higher increase in static pressure compared to a vane axial fan.They are typically used in fan coil units. They are less efficient than backwards curved fans. 

Backward-curved
Backward-curved blades, as in Figure 3(b), curve against the direction of the fan wheel's rotation. Smaller blowers may have backward-inclined blades, which are straight, not curved. Larger backward-inclined/-curved blowers have blades whose backward curvatures mimic that of an airfoil cross section, but both designs provide good operating efficiency with relatively economical construction techniques. These types of blowers are designed to handle gas streams with low to moderate particulate loadings[citation needed]. They can be easily fitted with wear protection but certain blade curvatures can be prone to solids build-up.[citation needed]. Backward curved wheels are often heavier than corresponding forward-curved equivalents, as they run at higher speeds and require stronger construction.
Backward curved fans can have a high range of specific speeds but are most often used for medium specific speed applications-high pressure, medium flow applications such as in air handling units.[citation needed]
Backward-curved fans are more energy efficient than radial blade and forward curved fans and so, for high power applications may be a suitable alternative to the lower cost radial bladed fan.

Straight radial
Radial blowers, as in Figure 3(c), have wheels whose blades extend straight out from the centre of the hub. Radial bladed wheels are often used on particulate-laden gas streams because they are the least sensitive to solid build-up on the blades, but they are often characterized by greater noise output. High speeds, low volumes, and high pressures are common with radial blowers[citation needed], and are often used in vacuum cleaners, pneumatic material conveying systems, and similar processes.

Principles of operation
The centrifugal fan uses the centrifugal power supplied from the rotation of impellers to increase the kinetic energy of air/gases. When the impellers rotate, the gas particles near the impellers are thrown off from the impellers, then move into the fan casing. As a result, the kinetic energy of gas is measured as pressure because of the system resistance offered by the casing and duct. The gas is then guided to the exit via outlet ducts. After the gas is thrown-off, the gas pressure in the middle region of the impellers decreases. The gas from the impeller eye rushes in to normalize this. This cycle repeats and therefore the gas can be continuously transferred.

Difference between fans and blowers
The property that distinguishes a centrifugal fan from a blower is the pressure ratio it can achieve. In general, a blower can produce a higher pressure ratio. Per the American Society of Mechanical Engineers (ASME), the specific ratio - the ratio of the discharge pressure over the suction pressure - is used for defining fans, blowers and compressors. Fans have a specific ratio of up to 1.11, blowers from 1.11 to 1.20 and compressors have more than 1.20. Typically due to the higher pressures involved blowers and compressors have much sturdier builds than fans.

If have any problem in how to choose centrifugal fans or use, pls feel free to contact us, we will provide our professional guidance, thanks.