DE218693C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

.- JV * 218693 - CLASS 59 b. GROUP

H.JAMES SCHWADE in ERFURT.

Centrifugal pump with relief device.

Patented in the German Empire on March 13, 1909.

It is known that in centrifugal pumps with unilaterally loaded impellers or impellers and especially with such multi-stage high pressure centrifugal pumps Pressure directly on a · shaft behind one another wheels a more or less there is a large axial thrust of the pump shaft towards the suction side. This axial thrust is already used in the known systems

ίο offset in part by using a Comb bearing, partly without the use of such a relief disc.

The present invention relates to a relief device with a relief disc, and it consists in the fact that a relief washer is simultaneously on one side of the Negative pressure in the suction chamber, on the other hand, is exposed to the delivery pressure. Though are already known relief pistons that

ao are under the influence of these pressures, but these pistons have a cylindrical surface, which seals the space on one side against the space on the other side. In contrast, the invention lies in the fact that the relief disc between this and the fixed abutment creates a gap that regulates itself.

Relief devices with relief discs and self-adjusting Annular gap are known. In these facilities, however, is the relief disc probably burdened by the variable delivery pressure on the one hand, but is on the other side in contact with the atmosphere, so there can be changes in the suction pressure do not follow. In addition, the pressurized water escapes directly into the open, which means a loss of pressurized water, which is all the less is permitted if the fluid is valuable. The present institution connects the advantages of the two known devices without having their disadvantages. The present Relief acts in such a way that the high pressure water of the relief device in the Moment where the shaft is pushed towards the pressure port, directly through a gap with the vacuum or the suction line in connection, whereby the high pressure on the relief device subsides, but the shaft immediately again automatically after this Side pushed and the gap is reduced again, and in this way by the automatic oscillations of the shaft with almost infinitely small amplitude of the axial pressure is completely balanced without the use of a comb bearing.

The automatically acting axial pressure regulator of the present invention thus differs of the "known axial pressure regulators" in that its reliefs disc on one side with the high pressure chamber of the last wheel and on the the other side is in connection with the vacuum, with simultaneous elimination of all through-holes' of the impeller walls and elimination of all sealing rings behind the larger impeller walls.

The accompanying drawing shows an embodiment of the relief device, α is the relief disc, b is the high-pressure chamber of the relief device, which is connected to the pressure port c or the high-pressure chamber d behind the last circle f through channel or pipe e . Of the

Ci. Edition, issued on November 12, 1912.)

Vacuum space or suction space A is in direct connection with space i behind the relief device a , so that there is always a vacuum on this side of the relief device.

The individual impellers have no through-holes and no sealing rings on the back at k.

Claims (1)

Patent claim: centrifugal pump with relief device, characterized in that a relief disc with automatically adjusting Gap is arranged, one side of which with the suction line and whose the other side is connected to the pressure line. 1 sheet of drawings.