RU2010107C1 - Centrifugal fan - Google Patents

Abstract

FIELD: fan manufacture. SUBSTANCE: impeller is mounted in fan helical casing 1 with inlet and outlet branch pipes 2, 3. The impeller has blades 4 located between lifting and rotor disks 5, 6, a rotating grinding device made in the form of nut 7 with diametrically located rods 8 which is positioned coaxially with the impeller is positioned in inlet branch pipe 2. Plate 9 with projections 10 inclined towards the impeller rotation is fastened to the inner surface of casing 1. Cross rods 11 with a square cross section are fastened to disks 5, 6 and are located in the interblade channels. Moreover, brackets 12 which have sections extendable above the impeller and grinding rods 13 with plates 14 located inside are also fastened to the disks. Additional rods 15 with profile matching the profile of rods 8 are circumferentially staggered on casing 1 ahead of pressure branch pipes 3 between the plate and the impeller. Rods 8 are located in two cross sections, and the rods of one section are displaced relative to the rods of the second section. EFFECT: improved structure. 2 dwg

Description

 The invention relates to the field of fan engineering, in particular to centrifugal fans operating in dusty environments and used to move the flow with suspended particles and grind foreign matter.

 A centrifugal fan is known, comprising a spiral housing with an inlet nozzle, an impeller located in the housing on the shaft, consisting of blades located between the bearing and cover discs and a rotating grinding device arranged in the inlet nozzle, made in the form of a nut with diametrically spaced rods, arranged coaxially with with the impeller, while on the inner surface of the casing there is a plate with protrusions inclined in the direction of rotation of the impeller, and on the disks located in the interscapular The main channels are square rods (see source).

 The disadvantage of this fan is the low efficiency of grinding foreign particles of a dusty environment, as a result of which the spiral casing and rotor blades undergo quite rapid wear due to their interaction with non-fragmented foreign particles in a moving medium (coke, grit, lining).

 These drawbacks are eliminated by the fact that the fan is equipped with brackets fixed to the impeller disks having sections protruding beyond the wheel and crushing rods located therein with plates and additional rods staggered between the plate and the impeller around the circumference of the spiral casing in front of the discharge pipe and having a profile coinciding with the profile of the rods of the grinding device, and the rods of the grinding device are located in two cross sections and with the rods of one section are displaced relative to the rods of the second section in the axial direction.

 The drawing shows a fan.

 In FIG. 1 shows a centrifugal fan, a longitudinal section; in FIG. 2 is a cross-sectional side view of a spiral casing.

 The centrifugal fan contains a spiral casing 1 with inlet and discharge nozzles 2 and 3, an impeller consisting of blades 4 located between the carrier and cover discs 5 and 6, and a rotating grinding device made in the form of a nut 7 made diametrically in the inlet pipe 2 located rods 8, placed coaxially with the impeller, while on the inner surface of the housing 1 is fixed a plate 9 with projections 10 inclined in the direction of rotation of the impeller, and transverse rods are fixed on the disks 5 and 6 and 11 square sections located in the interscapular channels, and brackets 12 having sections protruding beyond the wheel and disposed therein of crushing rods 13 with plates 14, while around the circumference of the spiral housing 1 in front of the discharge pipe 3 between the plate 14 and the wheel in a checkerboard pattern additional rods 15 are placed having a profile matching the profile of the rods 8 of the grinding device, the rods 8 being arranged in two cross sections, and the rods of one section displaced relative to the rods of the second c cheniya axially.

 The fan operates as follows.

 When the impeller rotates, the flow of a highly dusty mixture (for example, soot-gas) enters the inlet pipe 2, where, in contact with the rods 8, it is freed from crushing from foreign impurities such as coke, grit, lining, etc., with further movement of the mixture to the periphery of the impeller, additional inclusions are crushed by rods 11 and 13 and the plates 14 of the rods 13, while the dusty mixture in the gap between the housing 1 and the impeller is also crushed by the protrusions 10 of the plate 9 and the rod yami 15, then the flow of the working fluid enters the discharge pipe 3. (56) Copyright certificate of the USSR N 1694995, cl. F 04 D 29/70, 1991.

Claims (1)

 1. A CENTRIFUGAL FAN containing a spiral housing with an inlet nozzle, an impeller located in the housing on the shaft, consisting of blades located between the bearing and the covering discs and a rotary bearing, located in the inlet nozzle, and a rotary bearing with the impeller, at the same time, a plate with protrusions tilted to the side of rotation of the impeller is fixed on the inner surface of the housing, and on the disks located in the interscapular channels there are no rods of square cross section, characterized in that when the fan is operated with a discharge pipe, the fan is equipped with brackets fixed to the disks of the impeller, having sections protruding beyond the wheel spacers and having rods located therein with rods and additional bearing rods between them with a working wheel around the circumference of the spiral housing in front of the discharge pipe and having a profile that matches the profile of the rod of the grinding device, including the rod of the grinding device the trusses are located in two cross sections, and the rods of one section are offset relative to the rods of the second section in the axial direction.

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