DE1096204B - High-speed high-pressure centrifugal pump with a duesoidal annular gap upstream of the spiral housing - Google Patents

Description

High-speed high-pressure centrifugal pump with an upstream of the spiral housing nozzle-shaped annular gap The invention relates to a high-speed high-pressure centrifugal pump, the high pressures economically and with simple means in a single pressure stage able to generate.

In the previously known centrifugal pumps of this type is in one the stationary housing houses a paddle wheel running with a very high number of revolutions, which is open on the circumference and on the end faces and from the liquid in the essentially in the radial direction from the inside to the outside. is flowed through. The special ones Advantages of these known pumps are based on the fact that the stuffing box only has to seal low inlet pressure, regardless of the level of the delivery pressure; there are no gap losses; there is no longitudinal thrust.

With these designs, the pumped liquid is conveyed through the circumference of the housing Taken from tangentially arranged channels whose inlet openings are dimensioned so small are that the conversion of the dynamic pressure of the pumped liquid into static pressure takes place essentially by diffuser effect.

The tangentially arranged removal organs are in production expensive because of the precise machining required. The surfaces on which high Flow velocities can occur must be carried out very smoothly, which is only possible with the greatest effort in the known design.

It is also known per se to have an annular gap in centrifugal pumps nozzle-shaped or straight cutout in front of the volute casing and in the Intermediate area to prevent rotation.

The invention is based on the object of processing to create simpler diffuser training.

This object is thereby advantageously achieved by the invention solved that the radial gap by two opposing rings with a corresponding profile is formed in the pump housing.

The one-piece pump housing has an opening on one side that opens with is closed by a cover. Through this opening, the two can Annular gap diffuser forming ring body are introduced.

Another form of training is the exact distance. the two ring parts, which form the gap, by a sheet metal ring, which is flaps that are evenly distributed around the circumference and protrude into the gap, to manufacture. Through the webs or tabs of the sheet metal ring protruding into the gap it is also avoided that the pumped liquid rotates in the annular gap. Through this the path length and the friction loss are reduced. You can also get for otherwise the same design data for a larger gap width, which is for viscous media can be beneficial.

Advantageously, the webs are arranged so that a shock-free Entry of the liquid into the channels thus formed is effected.

The training according to the invention has the advantage of being very precise Manufacturing and adjustment facility that is cheap because of its simplicity.

In the drawings, the invention is shown in three figures, for example shown.

Fig. 1 shows a partial cross-section through a two-flow pump with smooth annular gap, Fig. 2 the same pump with an inlaid sheet metal ring, Fig. 3 den Section of a sheet metal ring to be inserted into the annular gap.

In A @ bb. 1 denotes a the pump housing, b the connection piece for the liquid inlet to the inlet into the pump wheel d on the one soap, e denotes a cover plate of the casing. The ring body h, which forms one half of the diffuser, is firmly connected with the pressure screws g to the housing part a in which it is mounted and forms the ring gap m with the ring body k.

In the interest of a favorable printing number, it may vary depending on the particular Conveying task be advantageous, the gap width in the first part from the inside to the outside to narrow and / or to expand outwards in the last part.

In Fig. 2, o denotes the spacer ring inserted into the gap m, ¢ are the lobes protruding into the gap-shaped annular space m, which determine the distance between parts h and k and at the same time prevent the rotation of the liquid in the annular gap.

In Fig. 3 a section of such a sheet metal ring is shown. Here q are when the sheet metal ring is inserted through two adjacent tabs released channels, which are preferably arranged so that the direction of the Channels runs approximately tangential to the impeller circumference.

Claims (4)

PATENT CLAIM: 1. High-speed high-pressure centrifugal pump of single-stage design with a paddle wheel running around in a stationary housing, open on the circumference and at the end faces and through which the pumped liquid flows essentially in a radial direction from the inside to the outside, in which the pumped liquid flows radially through a housing circumference arranged annular gap is removed, characterized in that the one-piece pump housing (a) has a one-sided opening (f) which can be closed by a cover (e) and through which the two annular bodies (h and k) forming the annular gap diffuser are inserted. 2. High-speed high-pressure centrifugal pump, thereby characterized in that the gap width narrows in the first part from the inside to the outside. 3. High-speed high-pressure centrifugal pump according to claim 1 or 2, characterized in that that the gap width widens outwards in the last part. 4. High-speed high-pressure centrifugal pump according to claim 1 to 3, characterized in that the gap width by inserted metal sheets, for. B. a sheet metal spacer ring (o) or by spacers is determined. Documents considered: Swiss Patent No. 211 998; French Patent No. 649 330; British Patent No. 252,393; USA. Patent Nos. 2,039,131, 1,496,633.