The wheel cone of the mixed flow wheel is precisely matched to the inlet cone for low leakages and turbulence, enhance efficiency and reduce sound.
The CFD simulation technology is used for optimized design which is also validated through repeated trials. This makes the IMF wheel has far higher efficiency than the traditional mixed flow wheel.
The wheel and flow passage components are molded and continuously welded. With high strength and precision, the product has reliable quality.
Both after the continuous welding process is finished and after epoxy coatings is applied on the surface, the wheel undergoes dynamic balancing tests. It reaches AMCA 204- G2.5 balancing level, well above the G6.3 standard that is required in China. The wheel balance is thus improved, vibrations and sound reduced.
The performance characteristics of the mixed flow wheel range between the axial and centrifugal wheel. Through the tests performed in the AMCA accredited laboratory (AMCA 300 Standard), we find that the mixed flow wheel has excellent sound performance that is friendly to human ears.
The performance characteristics of the mixed flow fan range between the axial and centrifugal fan. But the mixed flow fan has higher efficiency and lower sound. It takes in larger volume than the inline centrifugal fan and has higher pressure than the axial fan. If the operating point moves between A and B as shown here, the wheel of the mixed flow fan has a smaller diameter than the inline centrifugal fan at the same speed and when it has the same wheel diameter as the axial fan, the speed is lower.
Excellent airflow characteristics in transit are ensured by the optimized wheel design and guide grid. Turbulence and leakages are reduced and efficiency improved. YFIMF fans have obtained the AMCA certification for Fan Efficiency Grade and China Energy Label Grade 1, the highest in China.
The quiet sound quality of the mixed flow fan is attributed to its aerodynamic structure. As is shown here, the mixed flow fan produces far lower sound than the axial fan and DWDI centrifugal fan. What is more, the sound value is mainly in the low octave band (62.5-250Hz) and human ears do not feel disturbed by it.
— Each fan model of direct drive type has wheels of 6 different blade pitches for flexible model selection. This type features higher transmission efficiency, more compact design, low maintenance, less installation space and no quick wear parts.
–Automatic matching in model selection of belt drive type fan produces more flexible and accurate results. There will also be more convenient replacement of motors.
General ventilation / Explosion-proof ventilation / Smoke exhaust / Laboratory exhaust
YFIMF fans have the AMCA certification for Sound & Air Performance & FEG and are TUV SUD certified to run for 120 minutes under 300°C.
The YFIMF fan shall be belt driven inline type. And it shall be of the mixed flow type and in a cylindrical structure.
Tests shall be performed on YFIMF fans and certificates obtained under AMCA Standard 210 & 300. Each fan shall bear the AMCA Seal for Sound and Air Performance before leaving the factory. The manufacturer shall have the Production License for National Industrial Products and get the ISO9001 certification.
The mixed flow type wheel shall be made of steel and shall have a wheel cone, hemispheric hub and backward blades that are all welded. Each wheel shall undergo static and dynamic balancing tests and reach AMCA 204- G2.5 balancing level. At the highest running speed, the wheel shall produce smooth airflow and low sound. The decline in fan performance shall be prevented.
The inlet shall conform to aerodynamics and be made with quality carbon steel through the spinning process. It shall have streamlined design to allow for smooth airflow, less turbulence and low sound.
A two-cylinder structure shall be adopted on the housing: the inner cylinder and the fan housing interior connected through guide vanes. The structure is made of quality carbon steel, rolled round and welded. The inner cylinder is used to mount the driving parts. Acting as a support to the inner cylinder and in order to improve the air performance and static pressure efficiency of the fan, the guide vanes shall be a 3D curved structure.
The fan surface shall be treated so that no protuberances, welding spatters, burrs, sharp edges, scrap iron and greasy dirt can be found. Then electrostatic epoxy coatings shall be applied. Also for the corrosion-free operation in the long term, the surface shall be a level one without sags, cracks, cockles or detachment.
Heat treated through soaking furnace, the shaft shall reach the hardness level of HB250～280. Made of 40Cr steel, it shall undergo the hardening and tempering and finish turning processes. It shall have its speed designed at least 25% more than the maximum running speed of the fan.
Pulley: The size of the pulleys shall be at least 150% of the driving power. Pulleys shall be made of cast iron and keyed to the motor shaft. For the purpose of easily removing the pulleys, conical type bushings shall be used.
Belt: The belt shall be free from grease and oil, no statics and can run reliably under high temperature.
Bearing: The fan shall use the spherical roller bearing with set screws that can be lubricated. The bearing shall have a minimum L10 life of 80, 000 hours at the maximum cataloged speed. FYH SKF and other famous brands shall be used. In order to add lubricant without dismantling the fan, an extended copper lubrication line shall be equipped.
Belt Guard: To prevent any possible injuries, the belt guard shall be semi-enclosed.
The motor adopts B3 installation type. It shall have a degree of protection standard IP55, an insulation class F and Temperature Rise Class B. Its bearing shall be of ball type and require no lubrication. For safe fan operation, 1.15 shall be chosen as the coefficient of power reserve in selecting the motor. An epoxy coated rain cover shall be used for outdoor installation.
Customized accessories shall be provided to meet various requirements. The accessories available include vibration isolator, safety guard, inlet/outlet flexible connectors, inlet/outlet elbows and motor rain cover etc.
The motor shall be of explosion-proof type. An AMCA 99 Type C Spark Resistant Construction shall be adopted. A copper ring shall be fitted at the inlet. The fan shall have the Ex Certificate of Conformity and the Production License for Explosion-Proof Electrical Products shall be obtained.
As a fan used for smoke exhaust, the relevant requirements of GA 211-2009 High Temperature-Resistant Test Methods for Smoke and Heat Exhaust Ventilators and CNCA-C18-02：2014 China Compulsory Certification Implementation Rules – Fire protection products shall be met. Under 280 degrees, the fan shall run for over 30 minutes and no mechanical or electrical failures occur. State authorized test agencies shall issue the type test report for the IMF fan and the fan shall have a CCCf certificate.
As a fan used for smoke exhaust, the relevant requirements of EN12101-3 Smoke and heat control systems- Part 3: Specification for powered smoke and heat exhaust ventilators shall also be met. Under 300 degrees, the fan shall run for over 120 minutes and no mechanical or electrical failures occur. Both the TUV SUD test report and Class 1A certificate of CoC shall be obtained.
The YFIMF fan shall be direct driven inline type. And it shall be of the mixed flow type and in a cylindrical structure.
Tests shall be performed on YFIMCF fans and certificates obtained under AMCA Standard 210 & 300. Each fan shall bear the AMCA Seal for Sound and Air Performance before leaving the factory. The manufacturer shall have the Production License for National Industrial Products and get the ISO9001 certification.
The mixed flow type wheel shall be made of steel and shall have a wheel cone, hemispheric hub and backward blades that are all welded. Each wheel shall undergo static and dynamic balancing tests and reach AMCA 204- G2.5 balancing level. At the highest running speed, the wheel shall produce smooth airflow and low sound. The decline in fan performance shall be prevented.
The inlet shall conform to aerodynamics and be made with quality carbon steel through the spinning process. It shall have streamlined design to allow for smooth airflow, less turbulence and low sound.
A two-cylinder structure shall be adopted on the housing: the inner cylinder and the fan housing interior connected through guide vanes. The structure is made of quality carbon steel, rolled round and welded. The inner cylinder is used to mount the driving parts. Acting as a support to the inner cylinder and in order to improve the air performance and static pressure efficiency of the fan, the guide vanes shall be a 3D curved structure.
The fan surface shall be treated so that no protuberances, welding spatters, burrs, sharp edges, scrap iron and greasy dirt can be found. Then electrostatic epoxy coatings shall be applied. Also for the corrosion-free operation in the long term, the surface shall be a level one without sags, cracks, cockles or detachment.
The motor adopts B5 installation type. It shall have a degree of protection standard IP55, an insulation class F and Temperature Rise Class B. Its bearing shall be of ball type and require no lubrication. For safe fan operation, 1.15 shall be chosen as the coefficient of power reserve in selecting the motor. To avoid the motor being impacted by the airflow, the motor shall be inside the inner cylinder to isolate from the airstream. Appropriate external junction box shall be provided by the supplier.
Customized accessories shall be provided to meet various requirements. The accessories available include vibration isolator, safety guard, inlet/outlet flexible connectors, inlet/outlet elbows and motor rain cover etc.
As a fan used for smoke exhaust, the relevant requirements of GA 211-2009 High Temperature-Resistant Test Methods for Smoke and Heat Exhaust Ventilators and CNCA-C18-02：2014 China Compulsory Certification Implementation Rules – Fire protection products shall be met. Under 280 degrees, the fan shall run for over 30 minutes and no mechanical or electrical failures occur. State authorized test agencies shall issue the type test report for the IMF fan and the fan shall have a CCCf certificate.
As a fan used for smoke exhaust, the relevant requirements of EN12101-3 Smoke and heat control systems- Part 3: Specification for powered smoke and heat exhaust ventilators shall also be met. Under 300 degrees, the fan shall run for over 120 minutes and no mechanical or electrical failures occur. Both the TUV SUD test report and Class 1A certificate of CoC shall be obtained.
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