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
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D13/0606—Canned motor pumps
  • F04D13/0613—Special connection between the rotor compartments
• • 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
  • F04D29/04—Shafts or bearings, or assemblies thereof
  • F04D29/041—Axial thrust balancing
  • F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings

Definitions

• the invention relates to a motor centrifugal pump with a motor shaft which carries the motor rotor and at one end the pump impeller and is located together with the motor rotor in a canned or split pot to be lapped by the medium to be conveyed, wherein the motor shaft is guided by at least one radial bearing.
• the rotor of the electric motor is surrounded by the medium.
• the stator is separated from the medium by a canned tube.
• the bearings of the rotor are lubricated by the medium.
• the pressure difference between the suction and the pressure side of the impeller is used.
• the rotor of the motor is designed with a shaft bore.
• the media are contaminated with particles and chemical agents (inhibitors). This makes it necessary to limit the flow in the rotor space to the level required for the function of the engine, in particular with respect to the bearing lubrication and the cooling. In addition, it is necessary to prevent abrasive particles from entering the rotor space. Solutions are known in which mechanical seals are used. For the absorption of the axial forces, a thrust bearing is always additionally installed in these pumps. The object of the invention is to prevent the entry of particles into the rotor chamber in a motor centrifugal pump of the type mentioned. The manufacturing costs should be kept low.
• Ring washer abuts with an annular contact surface to form a thrust bearing with the annular disc.
• the mechanical seal is designed so that it simultaneously assumes the function of the thrust bearing of the pump. In order to ensure both functions, it is necessary for the sliding partners to always slide on one another during operation. Apart from a lubrication gap, no additional gap may arise.
• the magnetic force of the motor and the hydraulic forces of the pump are coordinated with each other so that this function is ensured.
• the contact surface of the wave washer an inner
• the thrust bearing region can be grooved and possibly provided with lubrication openings in a thrust bearing groove.
• the recesses open to the outer edge of the wave washer out.
• the recesses may be radial grooves.
• a further improvement of the lubrication is achieved if the shaft ring disc has at least one passage, in particular at least one bore, through which fluid passes from the disc rear side to the inner ring contact surface.
• the effective direction of the thrust bearing is given in the direction of the pump.
• the effective direction of the thrust bearing in the direction of the engine.
• this combination of mechanical seal and axial bearing is located on the pump chamber side in both variants.
• Fig. 5 is a side view of the wave washer.
• the motor centrifugal pump has a centrifugal pump with a pump housing 1, which has a pump chamber 2 with inlet 3 and outlet 4 and in which an impeller 5 is mounted, which is mounted on the end of a motor shaft 6.
• the motor shaft 6 is mounted as a hollow shaft in a split pot 7 by two radial bearings 8, 9.
• the remote from the pump radial bearing 8 is fixed in the closed end of the split pot 7 and the pump and the impeller 5 facing radial bearing 9 is located within a sleeve 10, which expands to the pump impeller to a flange 10 a, which between the pump chamber 2 and the
• Flange 7a of the split pot is located.
• the motor shaft 6 carries within the gap pot 7, the motor rotor 11.
• the split pot 7 is outside of the motor stator 12th
• a fixed annular disc 13 is coaxially fixed, which surrounds the motor shaft 6 and forms an annular gap 14 with the motor shaft 6, wherein the annular gap width is made only so large that the annular disc 3 does not touch the cylindrical outer surface of the motor shaft.
• a shaft washer 15 which is coaxially mounted on the motor shaft 6 so that it rotates with the motor shaft.
• the annular shaft plate 15 forms on its side facing the annular disc 13 an annular contact surface 16, with which it bears sealingly against the annular disc 13 to form a
• the recesses 17 There are preferably two, four, six or eight recesses 17 are arranged, which open in each case to the outer edge of the shaft ring disk 15, so From the outside fluid enters the recesses and is guided to the contact surface 19.
• the recesses 17 may have different shapes, as Figs. 2 to 4 show. The supply of liquid to
• Contact surface 16 is increased in a further embodiment by the fact that the wave washer 15 at least one and preferably two or more transverse, in particular axially parallel passages in particular
• Holes 20 flows through the liquid from the back of the disk to the inner ring contact surface 19.
• the shaft ring disk 15 is located on the side facing the impeller 5 of the fixed ring disk 13. In an alternative embodiment, not shown, the shaft ring disk 15 is located on the side facing away from the impeller of the fixed ring disk 13. In this case, ensure that Rotor axially acting on the thrust bearing in the opposite direction.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48628604

Family Applications (1)

Country Status (4)

Families Citing this family (5)

Citations (5)

Family Cites Families (8)

• 2012
  • 2012-06-22 DE DE201210012443 patent/DE102012012443A1/de not_active Withdrawn
• 2013
  • 2013-06-07 CN CN201380032410.8A patent/CN104411977B/zh active Active
  • 2013-06-07 EP EP13729258.7A patent/EP2864640B1/fr active Active
  • 2013-06-07 WO PCT/EP2013/001677 patent/WO2013189571A1/fr not_active Ceased

Patent Citations (5)

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