Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/26—Rotors specially for elastic fluids
  • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/26—Rotors specially for elastic fluids
  • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
  • F04D29/30—Vanes

Definitions

• the invention relates to mechanical engineering and can be used in the impellers of a centrifugal fan, designed to work in dusty environments.
• chord length of each blade is determined from the expression:
• D) is the input diameter of the wheel
• the blade is maximally curved at a distance from the input edge, which is 0.25 ... 0.42 from the chord of the blade, by an amount of 0.06 ... 0.09 from the chord of the blade, and the profile of the input section of the blade is made the radius defined by the equation x f / g f
• f is the value that determines the maximum curvature
• x f is the distance from the input edge to the most curved portion of the blade, and is mated to the output edge in a straight line.
• the specified non-manufacturability leads to a decrease in the reliability of the design, and to the deterioration of operational properties, in particular, to a decrease in the service life.
• the basis of the invention is the task to improve the impeller of a centrifugal fan by changing the ratios of the geometric parameters of the structural elements of the impeller, reduce the number of blades, ensure its mode of operation according to the new aerodynamic scheme, as well as access to the interscapular channel for monitoring, inspection, repair (restoration) and replacement of worn protection elements, and thereby increase its efficiency, reduce power consumption, increase efficiency, simplify the impeller, ovysit its adaptability, efficiency, reliable protection of the carrier disc and the working surfaces of the blades wear, its performance characteristics and the service life of the impeller.
• the length of the blade chord ⁇ 0,394D 2
• the maximum deflection of blade f max 0,037D 2
• the proposed impeller of a centrifugal fan with a mode of operation has an almost two-fold reduced number of working blades, and therefore, a twice-increased distance between them.
• This provided access to the interscapular canal for monitoring, inspection, repair (restoration) and replacement of worn protection elements and to achieve the efficiency and reliability of protecting the working surfaces of the bearing disc and blades from wear.
• This is very important, since the wear of protective elements is always local, local in nature, which first begins with coating defects. Timely identification and elimination of these local defects, which cannot be done in a thick scapular lattice, is the basis for increasing the impeller durability and improving its operational properties.
• figure 1 - presents the impeller of a centrifugal fan (General view);
• FIG. 2 impeller of a centrifugal fan (type A);
• FIG. 3 - a fragment of the impeller of a centrifugal fan.
• the impeller of the centrifugal fan comprises a central disc 1, the curved blade 2, a conical shape covering wheels 3 and stiffening ring 4.
• the impeller inlet diameter where D 2 is the outer diameter of the impeller.
• the width of the blade 2 at the exit b 2 0,081D 2 .
• the number of blades 2 is in the range of 12-14.
• the blade exit angle ⁇ 2 50-52 °.
• Wheel width b 0.162D 2 .
• the length of the chord of the scapula ⁇ ⁇ 0.394 ⁇ 2 .
• Maximum deflection of the scapula The length of the blade portion ⁇ ⁇ from its inlet edge ⁇ d0 of the point of its maximum deflection is 0, 177D 2 .

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=59365771

Family Applications (1)

Country Status (3)

Cited By (7)

Citations (7)

Family Cites Families (4)

• 2016
  • 2016-06-21 UA UAA201606758A patent/UA114769C2/uk unknown
• 2017
  • 2017-05-03 RU RU2018127493A patent/RU2730220C2/ru active
  • 2017-05-03 WO PCT/UA2017/000052 patent/WO2017222493A1/ru active Application Filing

Patent Citations (7)

Non-Patent Citations (1)

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