Rotary kinetic fluid motors or pumps – Runner or blade selectively adjustable relative to casing – Axially adjusted
Patent
1983-10-24
1985-06-04
Powell, Jr., Everett A.
Rotary kinetic fluid motors or pumps
Runner or blade selectively adjustable relative to casing
Axially adjusted
415128, 415170B, 415171, 415196, F04D 2908
Patent
active
045211515
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to pumps, especially to centrifugal slurry pumps.
A centrifugal pump has running clearances between the front and rear surfaces of the impeller and the corresponding surfaces of the casing. For good pump performance it is required that these running clearances be kept fine. However, slurry is abrasive and/or corrosive and wears the impeller and casing during operation such that the clearances, particularly the front clearance, increase. As the clearances increase more slurry and larger solid particles are enabled to pass between the impeller and the casing and this not only increases the rate of wear but also decreases the efficiency of the pump.
Some slurry pumps are provided with means for adjusting the axial position of the impeller within the casing such that the increase in the front running clearance can be compensated. However, adjustment of the impeller in this respect increases the back running clearance and reduces the effectiveness of the drive shaft sealing arrangement of the pump by putting this sealing arrangement under higher pressure. This adversely affects the overall performance of the pump. Furthermore, it has not heretofore been possible to provide for any adjustment of a submersible pump in which the impeller is directly coupled to an electric motor.
It is an object of the present invention to provide a pump in which increase in at least one of the running clearances can be compensated more effectively than previously.
According to the present invention there is provided a pump comprising a casing defining a chamber, an impeller arranged for rotation within the chamber about the axis of the chamber, and adjusting means for adjusting the axial dimension of the chamber.
As the axial dimension of the chamber is adjustable increases in the running clearances can be efficiently compensated.
Preferably, the chamber is defined between the casing and a backliner supported at the back of the casing. The adjusting means are arranged to enable axial movement of the backliner relative to the casing for adjusting the axial dimension of the chamber.
In an embodiment, the backliner is connected to a first annular flange which is coaxial with said casing. The casing carries a second annular flange arranged coaxially of said first flange. The flanges are axially spaced by a plurality of shims and bolted together to hold the backliner at the back of the casing. When the bolts are released, the number of shims between the two flanges can be altered to vary the axial spacing of the flanges and hence move the backliner axially with respect to the casing. The bolts are subsequently retightened with the flanges held at their adjusted spacing. Preferably, each shim is made up of two separate, substantially semi-circular parts, for ease of insertion and removal.
In an embodiment, further adjusting means are provided for adjusting the axial position of the impeller within the chamber. These further adjusting means enable the impeller to be correctly repositioned within the chamber when the axial dimension of the chamber has been adjusted.
In an embodiment, the impeller is carried on a rotatable drive shaft extending axially with respect to the casing, and said further adjusting means are arranged to enable axial movement of the drive shaft, and hence of the impeller, relative to the casing. Said further adjusting means may comprise any conventional mounting enabling axial adjustment of the drive shaft. For example, the drive shaft may be provided with a bearing cartridge fixed with respect to a frame housing, which supports the casing, by releasable clamping means. The clamping means can be loosened to allow axial movement of the bearing cartridge and the shaft and thereafter tightened to fix the shaft in the adjusted position.
In an embodiment, the impeller has a plurality of curved internal vanes extending from the eye of the impeller to its periphery. These vanes are also twisted at their end adjacent the eye of the impeller. It has been found that this increases the efficiency
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Frater John S.
Pope David W.
Joy Manufacturing Holdings Limited
Powell, Jr. Everett A.
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