4-79 4-2X79 centrifugal ventilator

4-79 4-2X79 centrifugal fan Application

    The 4-79 centrifugal fan can be used for indoor ventilation in general factories and large buildings. It can be used for gas input and gas output. The type of conveying gas is air and other unnatural, harmless to human body, and non-corrosive to steel materials. No sticky substances are allowed in the gas, and the dust and hard particles contained are not more than 150mg/m3. The temperature of the gas must not exceed 80°C.

Type

    The fan can be made to rotate clockwise or counterclockwise. Viewed from one end of the motor, the impeller rotates clockwise, which is called a clockwise fan, which is represented by "clockwise"; when it rotates counterclockwise, it is called an inverted fan, which is represented by "reverse".

    The outlet position of the fan is expressed by the angle of the air outlet of the casing. The 4-79 fan No.3～12 are all made into one form at the factory, and the user can install it in the required position according to the requirements. It is not necessary to indicate when ordering. No.3 The air outlet position adjustment range is 0°-225°, and the interval is 45°. No.3.5～6 air outlet position adjustment range is 0°-225°, the interval is 22.5°, No.3.5～6 transmission mode is type A transmission; No.7～8 air outlet position adjustment range 0°-180°, The fan interval is 22.5°, the transmission mode of No.7～8 is C-type transmission; the transmission mode of No.10-20 is E-type transmission, and the air outlet position is made into three fixed types: 0°, 90°, 180°, Cannot be adjusted, please specify when ordering. No.10~20 double air inlet types are made into three types with fixed air outlet positions: 0°, 90°, 180°, and the transmission mode is E-type transmission, which should be noted when ordering.

Structure

    No.3~6 fans of 4-79 type fans are mainly composed of impeller, casing, air inlet and other parts distributed directly connected motors; No.7~20 have transmission parts in addition to the above parts.

    ① The impeller is composed of 16 backward-inclined arc thin-plate blades, curved front disc and flat back disc, all made of steel plate. And after dynamic balance correction. The air performance is good, the efficiency is high, the noise is low, and the operation is balanced.

    ②The casings are made of two different types. No.3~12 casings are made as a whole and cannot be disassembled; No.14~20 casings are made of two-open type, divided into two halves along the midpoint horizontal plane, connected by bolts .

    ③The air inlet is made as a whole, installed on the side of the fan, and the cross section parallel to the axial direction is a curved shape, which can make the gas enter the impeller smoothly with less loss.

    ④The transmission part is composed of main shaft, bearing box, rolling bearing and pulley.

Utilization of fan

    Operation is permitted only when the fan is in perfectly normal condition.

    It is required to check each part of the fan for normality in case of startup of the fan upon maintenance.

    The fan shall be cleaned regularly and the dust, dirt and other impurities inside conveying pipeline shall be removed at regular interval to prevent rust.

    It is not allowable to repair the fan when it is in operation.

    A throttling device may be used for adjustment in case of excessive flow which not in compliance with operating requirements or smaller flow required in a short time.

    The fan shall be immediately stopped for inspection in case of abnormality during its startup, shutdown or operation.

Performance parameters of the fan

Machine number	Rotating speed (rpm)	Air volume (m 3 /h)	(Pa)	(kW)
3A	2900	1970 2180 2430 2670 2900 3130 3480 3830	1196 1167 1157 1117 1068 1039 892 725	1.5
	1450	990 1100 1220 1340 1450 1560 1740 1910	304 294 284 274 265 255 225 176	0.75
3.5A	2900	3120 3460 3860 4240 4600 4960 5520 6070	1627 1588 1568 1509 1460 1421 1205 980	3
	1450	1560 1750 1930 2120 2300 2480 2760 3040	412 402 392 382 363 353 304 245	1.1
4A	2900	4670 5220 5760 6310 6860 7410 8240 9080	2316 2078 2048 1980 1901 1852 1578 1274	5.5
	1450	2330 2610 2880 3160 3430 3710 4120 4540	529 519 510 490 480 461 392 323	1.1
4.5A	2900	6640 7440 8200 8990 9790 10550 11720 12920	2696 2626 2598 2510 2412 2343 2000 1618	11
4.5A	1450	3320 3720 4110 4510 4890 5270 5860 6450	676 657 647 627 598 588 500 402	1.5
5A	2900	9100 10200 11250 12350 13410 14480 16100 17720	3334 3255 3216 3099 2981 2902 2471 2000	15
	1450	4560 5100 5630 6180 6710 7240 8050 8860	833 813 804 774 745 725 617 500	2.2
6A	1450	4890 8820 9740 10700 11600 12520 13920 15320	1196 1176 1157 1117 1068 1039 892 706	5.5
	960	5230 5840 6420 7080 7680 8290 9220 10100	529 519 509 490 470 451 402 313	1.5
7C	1250	10820 12120 13340 14650 15850 17150 19160 20850	1206 1186 1167 1127 1078 1049 902 715	7.5
	1120	9650 10830 11950 13100 14200 15350 17200 18800	970 951 931 902 863 843 725 549	5.5