Product Overview: 4-68 Carbon Steel Centrifugal Fan

The 4-68 centrifugal fan can be used for indoor ventilation and air exchange in general factories and large buildings. It can be used to input gas or output gas. The gas transported should not be air with a temperature exceeding 80 degrees Celsius or other non self igniting, harmless to human health, or corrosive to steel materials. The gas should not contain viscous substances, and the amount of dust and hard particles should not exceed 150 milligrams per cubic meter.

Structural characteristics
The 4-68 type fan with machine number NO2.8-5 is mainly composed of impeller, casing, air inlet and other parts matched with a direct connected motor. In addition to the above parts, NO6.3-20 also has a transmission component.
1) The impeller is made of 12 inclined wing shaped blades welded to a curved wheel cover in the middle of a flat disc, made of carbon steel plate, and calibrated for static and dynamic balance. It has good air performance, high efficiency, and smooth operation.
1) The casing is a snail shaped body welded from high-quality carbon steel plates. The casing is made in two different forms, NO.2.8-12.5. The casing is made as a whole and cannot be disassembled, NO16, The 20 inch casing is made into two open parts, horizontally divided into two halves along the center and connected with bolts.
2) The air inlet is made into a convergent streamlined overall structure, installed on the side of the fan, with a curved cross-section parallel to the axial direction, which can allow gas to enter the impeller smoothly with minimal loss.
3) The transmission part consists of a main shaft, bearing housing, bearings, pulleys or couplings.

Product Structure and Performance

Performance parameter table

Angle selection diagram

Experimental verification

1、 Introduction to Tianhong Commissioned Experimental Laboratory (a large domestic wind turbine inspection laboratory):

1: Our laboratory has passed the qualification review of the Energy Efficiency Labeling Management Center of China National Institute of Standardization and obtained the qualification of Energy Efficiency Testing Laboratory for Ventilation Fan Energy Efficiency Labeling. After the fan products are tested by the center, they can be directly registered online and labeled with energy efficiency labeling based on the test report, and then produced and sold.

2: Our laboratory has 198 quality inspection projects for fan products, and the parameters have passed national laboratory accreditation and metrological certification.

2、 The power performance and noise testing laboratory ensures the accuracy of the results through the following methods:

1. Strictly follow standards such as ISO 5801 (GBT 1236), ISO 13350 (GBT 19843), ISO 5802 (GBT 10178) for design, construction, and testing operations;

2. The aerodynamic performance test adopts advanced multi nozzle method, replacing the traditional pitot static pressure tube to test flow rate, further improving accuracy;

3. The laboratory extensively uses new precision testing equipment and measuring devices;

4. Laboratory equipment and measuring tools have undergone strict calibration and regular re inspection and self calibration;

5. Multiple national level laboratories in China have conducted multiple "same machine inter laboratory comparisons" and participated in the capacity verification activities of ventilation fan testing laboratories carried out by national institutions.

3、 In addition to aerodynamic performance and noise detection functions, the laboratory also has the following testing capabilities:

1. Conduct impeller overspeed test according to JB/T 6445 Industrial Ventilation Fan Impeller Overspeed Test.

2. Conduct fan vibration testing in accordance with standards such as JB/T 8689 "Vibration Testing and Limits for Ventilators".

3. Conduct thrust testing on tunnel jet fans in accordance with the ISO 13350 standard for performance testing of industrial ventilation fans and jet fans.

Ensuring the efficiency of Tianhong's product research and development, reliable quality control, and improving the accuracy and authenticity of technical data.