Blowing fans BF-18, BF-20, BF-22

VDN-6,3	VDN-26
VDN-8	VDN-26F
VDN-9	VDN-28
VDN-10	VDN-31,5
VDN-11,2	VDN-32B
VDN-12,5	VDN-24х2М
VDN-13	VDN-25х2U
VDN-15	VDN-25х2М
VDN-17	VDN-25х2
VDN-18	VDN-25х2-I
VDN-19	VDN-25х2-II
VDN-20	VDN-25х2-IIM
VDN-21	VDN-28х2-I
VDN-22	VDN-36х2-Э
VDN-24

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General information

• low Pressure

• One-side suction

• Direction of rotation – right-hand and left-hand

• Quantity of blades – 12 pc

Blowing fans of one way suction BF-18, BF-20 and BF-22 (manufactured by aerodynamic scheme of МО СКТSH0,7-160-II) are intended for supply of a clean airinto the combustion chambers of stationary steam boilers and production units in other industries.

Fans BF are intended for operation at the ambient temperature minimum -30° Сand maximum +40° С; maximum allowed temperature of moved media at thefan entry is +200° С.

Blowing fans BF are designed for the long period operation indoorsand outdoors (outside, under tent) in mild climate (climate optin Y, location category 2, GOST 15150-69). Allowed ambient temperature is minimum -30°C and maximum +40°C.

The casing of fans BF is manufactured with turning angle 0° to 270° with15° pitch, the casing ribs, which hinder instillation, can be cut.

Advantages of blowing fans BF by «Medved concern»:

Axial guide mechanism of a blowing fan features the improved design: rotation ring rollers are installed on the roller bearing, what ensures the smooth turning of a guide mechanism blades. The guide mechanism is equipped with a dismountable handle, which ensures the convenient connection of singleturn actuators. The application of Teflon bushes and cast iron cowl on the axial guide mechanism ensures the minimum gaps of turning pins. It reduces blowing fan operating vibration and noise level appropriately.

Blowing fans by scheme 3 and 5 have dismountable bearing unit, which improve maintenance ability: it enables bearing change in the housing without removing of working wheel. In blowing fans VDN by scheme 3 and 5 from the working wheel side the big size bearing is installed, which improves the fans reliability. In fans VDN by scheme 3 and 5 with №9 it is possible to install the cooling piping circuit, is necessary.

Specifications of blowing fans

Overall and mounting characteristics of blowing fans ВДН

Dimensions and connection sizes of fans ВДН(90°)

Aerodynamic characteristics of blowing fans VDN

VDN-6,3

VDN-8

VDN-9

VDN-10

VDN-11,2

VDN-12,5

VDN-13

VDN-15

VDN-17

VDN-18

VDN-19

VDN-20

VDN-21

VDN-22

VDN-24

VDN-26

VDN-26F

VDN-28

VDN-31,5

VDN-32B

VDN-24×2М

VDN-25x2U

VDN 25×2М

VDN 25×2

VDN 25×2-I

VDN 25×2-II

VDN 25×2-IIМ

VDN 28×2-I

VDN 36×2-E

Acoustic characteristics of blowing fans VDN

Machine size	n, мin-1	Measurement range	The value of Lpi, dB in the octave band f, Hz							LpA, dB
Machine size	n, мin-1	Measurement range	125	250	500	1000	2000	4000	8000	LpA, dB
VDN -19	750	Discharge	111	114	113	110	108	104	98	115
		Suction	105	110	109	106	104	100	94	111
		Around the hull	100	104	103	100	97	92	85	105
	1 000	Discharge	118	122	120	117	115	111	105	123
		Suction	114	118	116	113	111	107	101	119
		Around the hull	109	112	110	107	104	100	93	112
VDN -13	1 000	Discharge	103	108	107	104	102	98	92	109
		Suction	99	104	103	100	98	94	88	105
		Around the hull	94	98	97	94	91	86	80	98
	1 500	Discharge	112	115	120	117	114	109	104	122
		Suction	108	111	116	113	110	105	100	118
		Around the hull	103	106	110	107	103	97	92	111
VVDN -15	1 500	Discharge	116	120	111	107	103	96	89	115
		Suction	113	115	108	105	101	93	87	111
		Around the hull	110	111	104	102	97	90	82	108
VDN -20	750	Discharge	108	109	108	107	103	98	93	108
		Suction	105	106	105	104	100	95	90	108
		Around the hull	97	97	95	94	90	87	83	98
	1 000	Discharge	115	116	115	114	110	105	100	115
		Suction	112	113	112	111	107	102	97	115
		Around the hull	104	104	102	101	97	94	90	105
VDN -26	600	Discharge	113	111	112	111	107	102	96	115
		Suction	114	109	110	108	106	103	98	113
		Around the hull	110	108	107	104	100	94	85	109
	750	Discharge	119	117	118	117	113	108	102	121
		Suction	120	115	116	114	112	109	104	119
		Around the hull	116	114	113	110	106	100	91	115
VDN -10	1 000	Discharge	96	100	98	95	93	87	80	100
		Suction	92	96	94	91	89	83	76	96
		Around the hull	89	92	90	87	84	77	70	91
	1 500	Discharge	103	106	111	108	105	100	95	113
		Suction	99	102	107	104	101	96	91	109
		Around the hull	94	97	101	98	94	88	83	102
VDN -28	600	Discharge	116	114	115	114	110	105	98	118
		Suction	117	112	113	111	108	106	101	116
		Around the hull	113	111	110	107	103	97	89	112
	750	Discharge	121	119	120	119	115	110	103	123
		Suction	122	117	118	116	113	111	106	121
		Around the hull	118	116	115	112	108	102	94	117
VDN -21	600	Discharge	107	105	106	105	101	96	89	109
		Suction	108	103	104	102	99	97	92	107
		Around the hull	104	102	101	98	94	88	79	103
	750	Discharge	113	111	112	111	107	102	95	115
		Suction	114	109	110	108	105	103	98	113
		Around the hull	110	108	107	104	100	94	85	109
VVDN -17	600	Discharge	120	125	115	111	107	100	93	119
		Suction	117	119	112	109	105	97	91	115
		Around the hull	114	115	108	106	101	94	86	111
VDN -17	750	Discharge	105	110	109	106	104	100	94	111
		Suction	101	106	105	102	100	96	90	107
		Around the hull	96	100	99	96	93	88	82	100
	1 000	Discharge	112	117	116	113	111	107	101	118
		Suction	108	113	112	109	107	103	97	114
		Around the hull	103	107	106	103	100	95	89	107
	1 500	Discharge	121	124	129	126	123	118	113	131
		Suction	117	120	125	122	119	114	109	127
		Around the hull	112	115	119	116	112	106	101	120
VDN -32B	600	Discharge	117	115	116	115	111	105	99	119
		Suction	118	113	113	112	109	107	102	117
		Around the hull	114	112	111	108	104	98	89	113
	750	Discharge	123	121	122	121	117	112	105	125
		Suction	124	118	119	118	115	113	108	123
		Around the hull	119	118	117	114	110	104	95	119
VDN -12,5	1 000	Discharge	103	107	106	103	101	95	88	108
		Suction	99	103	102	99	97	91	84	104
		Around the hull	96	99	98	95	92	85	78	99
	1 500	Discharge	111	114	119	116	113	108	103	121
		Suction	107	110	115	112	109	104	99	117
		Around the hull	102	105	109	106	102	96	91	110
VDN -8	1 000	Discharge	86	90	88	85	83	77	70	91
		Suction	82	86	84	81	79	73	66	87
		Around the hull	77	81	78	75	72	65	58	80
	1 500	Discharge	94	96	101	98	95	90	85	103
		Suction	90	92	97	94	91	87	81	99
		Around the hull	85	87	91	88	84	78	73	92
VDN -31,5	600	Discharge	117	113	110	104	102	94	86	111
		Suction	111	110	111	105	101	93	85	111
		Around the hull	102	100	100	102	99	91	85	105
	750	Discharge	121	121	116	112	108	103	94	118
		Suction	115	117	116	114	108	101	93	118
		Around the hull	109	106	106	107	106	101	92	112
VDN -18	750	Discharge	105	107	105	104	100	95	91	105
		Suction	102	103	102	101	97	92	87	105
		Around the hull	95	94	92	91	87	84	82	95
	1 000	Discharge	113	114	112	111	107	102	98	113
		Suction	109	120	109	108	104	99	94	113
		Around the hull	103	103	99	99	97	91	89	103
VDN -6,3	1 000	Discharge	80	84	91	81	79	80	66	90
		Suction	76	80	87	75	74	76	62	86
		Around the hull	71	76	82	69	67	67	60	80
	1 500	Discharge	88	90	95	92	89	84	79	97
		Suction	84	86	91	88	85	80	75	93
		Around the hull	79	81	85	82	78	72	67	86
VDN -15	750	Discharge	101	106	105	102	100	96	90	107
		Suction	97	102	101	98	96	92	86	103
		Around the hull	92	96	105	92	89	84	78	96
	1 000	Discharge	108	113	112	109	107	103	97	114
		Suction	104	109	108	105	103	99	93	110
		Around the hull	99	103	102	99	96	91	85	103
	1 500	Discharge	101	106	105	102	100	96	90	107
		Suction	97	102	101	98	96	92	86	103
		Around the hull	92	96	105	92	89	84	78	96
VDN -11,2	1 000	Discharge	100	103	102	99	97	91	84	104
		Suction	96	100	98	95	93	87	80	100
		Around the hull	93	96	94	91	88	81	74	95
	1 500	Discharge	107	110	115	112	109	104	99	117
		Suction	103	106	111	108	105	100	93	113
		Around the hull	98	101	105	102	98	92	87	106
VDN -24	600	Discharge	110	108	109	108	104	99	92	112
		Suction	111	106	107	105	102	100	95	110
		Around the hull	107	105	104	101	106	91	82	109
	750	Discharge	116	114	115	114	110	105	98	118
		Suction	117	112	113	111	108	106	101	116
		Around the hull	113	111	110	107	112	97	88	115
VDN -9	1 000	Discharge	90	94	92	89	87	81	74	94
		Suction	86	90	88	85	84	77	70	90
		Around the hull	81	84	82	79	76	69	62	83
	1 500	Discharge	97	100	105	102	99	94	89	107
		Suction	93	96	101	98	95	90	85	103
		Around the hull	88	91	94	91	89	82	77	96

NOTE: Acoustic characteristics are given for conditions: the axial guide unit is fully open, Bar=760 mm Hg. art., the temperature of the moving medium t=30°C.

Acoustic characteristics of traction machines type

VDNх2 №24-36

Machine size	n, мin-1	Measurement range	The value of Lpi, dB in the octave band f, Hz							LpA, dB
Machine size	n, мin-1	Measurement range	125	250	500	1000	2000	4000	8000	LpA, dB
VDN 24-2М	750	Ddischarge	120	118	119	118	113	108	101	122
		Suction	120	115	116	114	111	109	105	119
		Around the hull	116	114	113	110	106	100	91	115
VDN 25-2U	750	Ddischarge	121	120	117	118	112	109	107	121
		Suction	116	111	111	113	109	106	103	117
		Around the hull	115	113	108	108	106	101	96	113
VDN 25-2	750	Ddischarge	120	119	116	117	113	109	106	121
		Suction	115	110	109	111	107	106	108	116
		Around the hull	114	113	111	107	105	101	96	113
	1 000	Ddischarge	127	126	123	124	120	116	113	128
		Suction	122	117	116	118	114	113	108	122
		Around the hull	121	120	118	114	112	108	103	120
VDN 25-2-II	750	Ddischarge	137	131	132	129	125	120	114	134
		Suction	128	122	123	122	120	120	116	128
		Around the hull	128	123	119	115	114	110	106	122
VDN 36-2-Е	750	Ddischarge	134	136	131	126	122	118	107	133
		Suction	121	123	122	118	112	109	101	123
		Around the hull	112	103	112	109	109	103	92	115