DE1728462A1 - CENTRIFUGAL PUMP WITH SPHERICAL AIR GAP - Google Patents

Description

DK 2221 / 2-4 standard magnet AG
AZ: 1728 462.7-15 1728462

Centrifugal pump with spherical air gap

The invention relates to a centrifugal pump with an impeller, which is driven by a rotating pole ring with a spherical air gap and not only around a spherical bearing Rotary, but also swivel movements can perform.

Pumps and other flow machines with pivotably arranged Runners are becoming more and more important, because pivotable bearings can, since they do not have relative movements run only in the circumferential direction, are extremely heavily loaded, they show almost no wear. The disadvantage of pivotability is that the width of the sealing gap between the pump impeller and the pump housing does not remain constant. This means that considerable short-circuit losses are unavoidable.

The invention shows a way in which these losses can be avoided.

According to the invention, the area of the impeller, which is the intake manifold is facing, formed with spherical boundary surfaces in a manner known per se. The impeller is preferably used for this purpose designed as a covered impeller. The surfaces pointing towards the suction port of the pump housing are according to the invention Spherical surfaces of balls, the center of which coincides with the center of the pivot bearing. This makes it possible to use any to achieve accurate sealing even when the impeller

209882/0109

ORIGINAL INSPECTED

by asymmetrical hydraulic forces or by in the Dirt particles that have reached the sealing gap cause a strong pivoting. A leakage current flows through the sealing gap from outside (the pressure chamber) inwards (the suction chamber), If dirt particles get into the density gap with this leakage flow, the centrifugal force acting on it acts in the opposite direction. This can cause a dirt particle

stay in the density gap for a long time. The invention avoids this by arranging spiral grooves in the sealing gap *

The invention will be described with reference to a figure.

The armature 41 of the electric motor drives a permanent magnetic pole ring 1. The armature and pole ring accordingly generate a rotating field like the stator of an electric motor, for example. The circumferential magnetic field penetrates the dome-shaped partition 7 and sets the permanent or soft magnetic pole ring 11 in rotation. The PoI ring 11 forms a unit with the pump impeller. The axial support and radial guidance is achieved on the one hand by magnetic forces, on the other hand by the bearing 6, 12, which has a spherical guide surface, so that the polarity of the U-La r ade ία -he it a yersGJmetfmng "m $ # Φβ Aefkse 4WR & ifflmtm Imm * lter ■ blade ring 34 is 4WE & "inen Afcdeckrii ^ g covered 33," o that a sogeaappAee GESS && v8mm $ impeller eistetefet, PIe for suction 6 4es fTwmfeiaß & BMSS ** teiiwei ^ eisd "i |? i" rfi3L * # e 38 of the Beschaufeiwng 34 'of the Abteskringee 33 veri * runs genoAss the Erfiv4u% $ 4 & w surface of a sphere whose. .Zentrum mü 4 & m 8Φμ * 1 & * μ & 1Ν »-4 * 9 L * g # r« &, \% together-t, This means that the 4-way gap 37 ßtela is wide, Aweb. the .dem

209 * 82/010 «-3

The surface of the suction nozzle 36 facing the impeller is according to the invention advantageously spherical and designed concentric to said sphere.

For the automatic removal of dirt particles that have penetrated the sealing gap, spiral grooves 48 are provided, which, seen in the circumferential direction of the rotor, develop outwards, so that the dirt particles that have penetrated again is conveyed back into the pressure chamber 49. According to the invention, the intake port 36 can be designed to be axially displaceable. For this purpose, it is pressed against the impeller by the rubber ring 39, and the gap is defined by the screw 40.

209 882/0109

Claims (5)

Standard Magnet AG 'DK 2221 / 2-4 P ate nta ns pr üche 1. Centrifugal pump with a pump impeller which forms a unit with a pole ring and which can be pivoted is mounted in such a way that, in addition to the rotary movement, swivel movements around any axes are possible, thereby characterized in that the blades (34) and / or a cover ring (33) delimiting the blades to the pump housing (30) towards the surface of a ball (38) follows, whose * ■ Center coincides with the center of the pivot bearing (6, 12). 2. Centrifugal pump according to claim 1, characterized in that the surface facing the impeller (33, 34, 11) the suction port (36) of the pump housing (30) runs on a ball, the center of which with the Zentrwm of the Pivot bearing (6, 12) coincides. 3. Centrifugal pump according to claim 2, characterized in that in the sealing gap (37) between the impeller and the intake port (36) spiral grooves (48) developing outwards in the direction of rotation are arranged. 4. Centrifugal pump according to claim 1, characterized in that the suction port (36) for setting the sealing gap (37) is arranged to be axially displaceable. 2Ü9882 / 0109 _ ₅ _ 5. Centrifugal pump according to claim 4, characterized in that the axial displacement by a screw (40) takes place and that a spring element (39) is provided which the suction port (36) in the direction against the The impeller (33, 34, 11) seeks to move. 209882/0109 L e r s e i t e