VTS VENTUS PRO PVS 24x24 [29/34] Tc t x kt x ks
Макгруп McGrp.ru
Задайте вопрос
Зарегистрироваться

VTS VENTUS PRO PVS 24x24 [29/34] Tc t x kt x ks

VTS VENTUS PRO PVS 12x18 [29/34] Tc t x kt x ks
29
OIMM – VENTUS PRO
Bearings have to be controlled and cleaned regularly; have to be lubricated adequately to prevent direct metallic
contact between rolling elements, to prevent wear and to project bearing surfaces against corrosion.
The fans with low shaft power are equipped with bearings in a rubber housing which absorbs a part of vibration.
When you change the bearing it is very important to change the rubber housing too. These bearings don’t need
to be lubricated.
The fans with higher shaft power are equipped with bearings with cast iron support. The lubricant lled in a bearing
gradually loses its lubricating properties during operation. Therefore, it is necessary for grease to be replenished
or renewed from time to time. The grease used is always lithium soap type suitable for all temperatures within
the operating range.
Excess grease will cause the operating temperature to rise rapidly, particularly when running at high speeds.
Therefore, only the bearing should be completely lled, whilst the free space in the housing should be partly lled
(between 30% and 50 %) Where bearings are to operate at very low speeds and must be well protected against
corrosion, it is advisable to completely ll the housing.
Relubrication interval depends on the fan speed and bearing internal diameter and is calculated by the following
formula:
t = 10 x {14x106 / (n x √d ) – 4 x d }
where:
t = relubrication interval ( h ),
n = fan speed ( rpm ),
d = bearing inner diameter ( mm )
If the fan works in particular conditions, relubrication intervals have to be corrected concerning the temperature
and surrounding factors, according to the following formula:
tc = t x kT x kS
where,
tc = corrected relubrication interval,
kT = temperature correction factor,
kS = surrounding correction factor
Temperature correction factor kT takes into account the reduction of relubrication interval when bearing
temperature raised over 70ºC.
LUBRICATION OF BEARINGS
3.10.8
FAN SPEED
(rpm)
BEARING INNER DIAMETER (mm)
20 25 30 35 40 45 50 60
250 124 420 111 000 101 040 93 250 86 940 81 680 77 190 69 890
500 61 810 55 000 49 920 45 920 42 670 39 940 37 600 33 740
750 40 940 36 330 32 880 30 150 27 910 26 020 24 400 21 700
1000 30 500 27 000 24 360 22 260 20 530 19 070 17 800 15 670
1250 24 240 21 400 19 250 17 530 16 100 14 890 13 840 12 060
1500 20 070 17 660 15 840 14 370 13 150 12 110 11 200 9 650
1750 17 080 15 000 13 400 12 120 11 040 10 120 9 310 7 920
2000 14 850 13 000 11 580 10 430 9 460 8 630 7 900 6 630
3000 9 630 8 330 7 320 6 480 5 770 5 150 4 600 3 620
4000 7 020 6 000 5 190 4 510 3 930 3 410 2 950 2 110
5000 5 460 4 600 3 910 3 330 2 820 2 370 1 960 1 210

Содержание

Похожие устройства

Скачать