FI85618C - ANORDNING FOER AXIELL FOERSKJUTNING AV EN PUMPS LOEPHJUL. - Google Patents

Description

8561 8

EQUIPMENT FOR MOVING THE PUMP OF THE PUMP AXIALLY-ANORDNING FOR AXIAL RELEASE AV ENPUT PUMPS

The present invention relates to a device for axially moving a pump impeller 5, the impeller being threadedly mounted on bearings mounted on bearings mounted outside the pump housing, provided with a shaft sleeve pressed against the impeller hub by tightening nuts.

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In centrifugal pumps, there must be a certain clearance between the front and / or rear surfaces of the impeller and the corresponding housing surfaces. However, due to the wear of the surfaces, the clearance increases during use and must therefore be adjusted from time to time, which is usually done by moving the impeller in the desired direction. It must be possible to carry out the transfer with the pump closed, as opening the pump is a labor-intensive operation. Usually, the axial displacement of the impeller is carried out in such a way that a mechanism is built in connection with the bearing, by means of which the pump shaft 20 and at the same time also the impeller are displaced. However, such a structure is relatively complex.

The object of the invention is to provide a simple ... 25 impeller axial transfer mechanism.

The device according to the invention is characterized in that the shaft sleeve has a protrusion, the corresponding recess of which is in the impeller or vice versa, whereby the impeller is displaceable in the axial direction by rotating it by turning the shaft sleeve.

The invention will now be described in more detail with reference to the accompanying drawing, which shows a centrifugal pump in which the invention has been applied, in vertical section.

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In the figure, reference numeral 1 denotes a pump housing with an impeller 2. The impeller is fixed to the shaft by means of internal threads at its hub 3 and external threads 5 at the end 5 of the shaft 4. The shaft is rotatably mounted on bearings 6 and 7 mounted outside the pump housing. A shaft sleeve 8 is fitted to the shaft, which is pressed tightly against the end face of the impeller hub by a nut 9. The nut has a different hand thread than the impeller.

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The nut end of the shaft sleeve and the outer circumference of the nut have recesses 10 and 11 so that they can be rotated using a spanner. At the impeller side end of the shaft sleeve there is a protrusion 12 which fits into a recess 13 in the hub of the impeller 15. The shaft sleeve may, of course, have a plurality of protrusions and a plurality of recesses in the hub. The protrusions may be in the hub, and the recesses in the shaft sleeves. The clearance between the front surface of the impeller and the corresponding surface of the housing is marked A: 11a. The clearance between the rear surface of the impeller 20 and the corresponding surface of the housing is denoted by B.

The axial displacement of the impeller takes place as follows:. 25 1. Loosen the nut 9, in which case the threaded connection between the impeller 2 and the shaft 4 will also loosen.

2. The shaft sleeve 8 is rotated in the desired direction, whereby the impeller 2 also rotates accordingly and at the same time moves 30 axially. Rotation of the shaft 4 with the shaft sleeve must be prevented.

3. When the desired clearance A or B (depending on the design of the pump) has been reached, tighten the nut 9 against the shaft sleeve 8, "... 35 whereby the threaded connection between the impeller 2 and the shaft 4 is also tightened;

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With the solution according to the invention, e.g. the following advantages over known structures: - manufacturing costs are reduced due to the simpler structure 5 and the smaller number of parts.

- bearing manufacturing errors are reduced because there is no sliding sleeve between the bearings and the bearing brackets.

The invention is not limited to the embodiments shown, but can be modified and applied within the scope of the inventive idea defined by the claims. Thus, the impeller and the shaft sleeve can also be connected to each other in other ways, so that when the shaft sleeve is rotated, the impeller rotates simultaneously, e.g. with a groove connection.

Claims (3)

4,85618 Claim Device for axially moving a pump impeller, which impeller (2) is threadedly attached to a shaft (4) rotatably mounted on bearings (6, 7) arranged outside the pump housing 1 and surrounded for a part of the distance between the impeller (2) and the bearing housing by a shaft sleeve ( 8) which is pressed against the hub (3) of the impeller (2) by means of a tightening nut (9) which can be tightened by means of threads arranged on the shaft (4), characterized in that the shaft sleeve (8) has a protrusion (12) with a corresponding recess in the impeller ( 2) or vice versa, wherein the impeller (2) is displaceable in the axial direction by rotating it by its threads (5) by turning the shaft sleeve (8). 20 Patenting In the case of an axle for rotating the pump, the drive shaft is mounted on the axle (4), and the rotary head is mounted on the pump (6, 7) after the pump. - 25 (1) with or without a strap with a spindle (2) with a bearing on the axle (8), with an anchor to the spindle (2) nav (3) with a spindle (9), with a spindle the axle of the axle (4), the headforms of the axle (8) being used as a tool (12), having a weight of the axle (13) and the color of the color (2) of the axle (2) of the axle riktning genom att vrida det i sinä: *: gängor (5) genom att vrida axelhylsan (8). • ·> • »