DE720243C - Centrifugal pump - Google Patents

Description

Centrifugal pump It is already known for centrifugal pumps that the efficiency, especially. in pumps for small delivery rates and large delivery heads, thereby improving that only partially loaded impellers are used. It's with centrifugal pumps also already known, auxiliary blades or channels for sucking off the fission liquid and to provide return to the pressure chamber of the pump housing and thereby a To achieve a pressure increase in the pump housing and relief of the stuffing box. The auxiliary blades are arranged on the back of the impeller wall.

The invention also relates to a centrifugal pump with a partially loaded Impeller and auxiliary blades or channels for sucking off the fission liquid, differentiates However, according to the invention, it differs from the known designs, in particular by that, as auxiliary channels, the impeller cells not acted upon or some of them are used. This has the advantage that. that at the same or still improved effect, the impeller and thus the entire pump is made narrower and also reduce the weight of the impeller and the stress on the shaft will be.

The auxiliary channels formed by the unloaded impeller tents are either open or closed at the side and point in the latter case In the impeller wall in front of the impeller sealing hub, openings for the entry of the splitting fluid on.

Further features of the invention emerge from the drawing, which Illustrated embodiments of the subject invention. It shows - Fig. r a centrifugal pump according to the invention in longitudinal section, Fig. z and 3 the impeller of the pump according to Fig. z in axial and radial section, Fig. q. another version of the impeller in section along the line, z-t of Fig. 5, Fig. 5 the impeller of Fig. q. in radial section.

Figures 6 and 9 show a third embodiment of the impeller in Section along line 2-z of Fig. 7 or 3-3 of Fig. 8; the Fig. 7 and Fig. S illustrate radial. Sections in view from the left or right.

In the case of the centrifugal pump shown in Fig. I, the pumped liquid arrives through the axial inlet port a into the conveying channels b of the partially acted upon Impeller c and then into the pressure chamber d of the pressure housing e, from where they are in the usual Way is discharged. The one between the pressure casing and the impeller through the left impeller gap f cracking liquid that passes through passes through the auxiliary seal gapg again back into the suction chamber. The liquid passing through the right impeller gap 1 reaches the auxiliary seal gap and is there through the openings k of the lateral Auxiliary impeller lanes l sucked off. This liquid flowing in under a certain pressure is determined by the peripheral speed of the impeller in the auxiliary channels L after Pressure chamber d thrown and thereby achieved an additional increase in pressure.

According to the invention, the impeller cells that are not acted upon serve as auxiliary channels for sucking off the fission liquid. According to Fig. I to 3 two opposite channels b of the impeller are acted upon and the four remaining impeller cells not acted upon are designed as auxiliary channels l for the gap fluid. The auxiliary channels are closed laterally at the impeller inlet and have openings h in the impeller wall in front of the impeller seal for the entry of the gap liquid. The mouths / t of the channels L are on the side facing away from the suction chamber, so the auxiliary channels are not connected to the suction chamber of the pump. The openings h leading to the auxiliary channels can also be seen alternately in the front and rear of the impeller wall, so that the auxiliary channels are alternately open on one side and on the other.

Figs. 4 and 5 illustrate an impeller with two normal pressurized channels b and four on the right side: open auxiliary channels in which are not connected to the suction chamber of the pump.

In the case of the impeller according to Figs. 6 to 9, are. two pressurized channels b and two auxiliary channels open on the right and two auxiliary channels open on the left.

Of course, a different one can also be used, depending on the number of blades Number of channels and auxiliary channels must be provided.

If there are still small traces of fissile fluid at the sealing gap of the umbilicus pass through, these are through the openings provided in the impeller wall o sucked after the suction chamber, so that in front of the stuffing box in the annular gap p a There is negative pressure. The stuffing box g is completely relieved, especially so is important when pumping acids.

The illustrated embodiments can of course be varied Shape can be changed without departing from the spirit of the invention.

Claims (1)

PATENT CLAIMS: i. Centrifugal pump with partially loaded impeller and auxiliary blades or channels for sucking off the fissure fluid, characterized in that the unloaded impeller cells, possibly also only individual ones, are used as auxiliary channels. Centrifugal pump according to claim i, characterized in that the auxiliary channels (L) are closed at the sides and openings (k) for the entry of the gap liquid into the auxiliary channels f-1.) Are provided in the impeller wall in front of the impeller sealing hub (i) (Fig. i to 3). 3. Centrifugal pump according to claims i and a, characterized in that the openings (h) leading to the auxiliary channels (L) are provided alternately in the front and rear wall of the impeller. 4. Centrifugal pump according to claim i, characterized in that the auxiliary channels (in) are open on the side facing away from the suction chamber (Fig. 4, 5). 5. Centrifugal pump according to claims i and 4, characterized in that the auxiliary channels (in, n) are alternately open once on one side and once on the other side (Fig. 6 to 9).