DE1453781A1 - Pump unit - Google Patents

Description

PATENT LAWYERS _{p i2l} . "

Dr. Andrejewski ^{PU 53}

Dr.-Ing. Honke
«EK

g e

«Essen, Kettwi _g er Str. 36 _. ". ,. _{1n /! B}

(A.H ^ ptbaimhoi Udttbure) Essen, July 8, 1968

Telephone 225802/03 _{( ? Λ 1gQ / Κχι} )

Patent registration of the company
Jönköpings Mekaniska Werkstads AB

Jönköping / Sweden Pump unit

A pump is already known (see US Pat. No. 2,851,956) in which the shafts are pushed over Bushing and screws inserted into the grooves of the two shaft parts be «It is evident in this execution, however the coupling sleeve more or less elastic »

In another known embodiment (see »DAS 1 07 ^ 4o1) the pump rests on feet and has a Shaft on which is supported in two bearings. This pump is coupled to a motor that is also on Feet rests and has a shaft, which is also supported in two bearings, but it is extraordinary Lich is difficult or even almost impossible, two

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To arrange precisely coaxial shafts on these floating shafts, it must inevitably be assumed that the pump shaft and the motor shaft are united by means of an elastic coupling to form a flexible "flexible" shaft. see. US Patent No. 2,666,394) which is also mounted in two bearings _e likewise in two bearings is a known pump (s _e British 'Patent specification 379,738) is mounted, wherein the motor is not supported by the PLimpengehäusedeckel, but from the pump housing will*

The invention is based on the task of creating a pump unit in which two coaxial ^; Components can be assembled to form a rigid shaft and can be stored in three bearings in such a way that these bearings do not interfere with one another

The invention relates to a pump unit ^1, ''"an engine and a driven thereby Zentri" from ^r / '' · - ": fugalpumpe is"'", whose impeller is overhung', wherein the motor and the pump, a joint, have practically rigid shaft, which consists of two parts which are practically coaxial with each other and are connected to each other by a coupling, one of which is in two bearings arranged in the motor and the second part, which is the "Plü -« '- "'' Gelrad carries, in a third bearing arranged outside the door, it is possible

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connected by the third in the pump housing cover arranged storage is surrounded.

The following is an embodiment of the invention explained in detail on the basis of the enclosed figure showing the unit in part.

The pump assembly according to the invention comprises a normal electric motor 1 in standard dimensions, as well as a centrifugal pump 2 likewise in standard dimensions. The motor has a motor shaft 3i which is mounted in two ball or roller countersink bearings k , which cannot absorb significant axial loads, as well as a connecting flange 5 · The pump 2 has a pump housing 7 »a housing cover 8, which is secured by screws 9 and nuts Io is detachably attached to the pump housing, as well as an impeller 11, which is fixed by a wedge 6 on the pump shaft 12, which is surrounded by mechanical seals 13. Several webs 1 * 1 extend from the cover 8 of the pump housing, namely four pieces in the illustrated embodiment, which are connected to one another at the other end by a common flange 15. This flange carries the motor 1, the flange 5 of which is detachably screwed to the flange 15 of the pump housing cover by means of screws 16 and nuts 17. A bearing housing 18 is provided between the webs tk , in which the pump shaft 12 is supported by ball or roller bearings 19 which can absorb the considerable axial forces that can occur when the impeller of the pump is in operation.

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Fie can be seen from the drawing, the upper one has The end of the pump or extension shaft 12 is in the form of "a base that holds the lower end of the mo" Door shaft 3 encloses and is connected to this to form a practically rigid unit by a self-centering coupling. The expression "Self-centering clutch" here refers to a clutch in which the clutch to one Whole assembled shafts are more or less automatically coaxial with each other and in addition, to a practically rigid composite shaft "b connected by tensioning the clutch. The coupling shown in the drawing is a so-called adapter sleeve coupling known per se, which firstly has a clamping sleeve 21, the inner surface of which with the outer aia ± isic ± »± jacket of the pump shaft 12 cooperates. This pump shaft 12 has a conical part 22 and is threaded above the same 23 provided »Second is a chuck which is screwed onto this thread 23 can, provided. The space 25 between the conical part 22 and the inner surface of the clamping sleeve 21 is filled with a wax-like printing mass ».

The main problem with such a structure occurs and which is solved by the invention is, it can be seen that a shaft of a normal electric motor does not initially have the dimensions

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has which are beneficial or necessary for the impeller and for the wave finishes, and Secondly, that this motor shaft is not supported in bearings that absorb such large loads can, specifically in the axial direction, as they occur during operation of the pump wheel, According to the invention, this problem has been solved, or at least largely improved by the motor shaft while maintaining its mechanical rigidity through a special shaft extension or stub shaft 12 is extended, on which the impeller 11 of the to be connected Pump is placed, and which is mounted in a single bearing 19 which is designed in this way is that it is the loads, both radial and, in particular, axial, which occur during operation the impeller emerges, can absorb »As a result of this approach, the problem became the old one

Embossed, namely the question of storage a rigid "hurry in three bearings, without these having any harmful effect on one another.

As is well known, storage results in a rigid arrows in three positions, especially in Ball or roller bearings by no means a satisfactory operation of the shaft, since the manufacturing tolerances in practice are so great that they are comparatively little play that prevails in the bearings, which does not compensate for manufacturing defects, so that the bearings' hinder one another} d * .h. so harmful interact »

According to the invention, this disadvantage was eliminated by the following two measures:

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a) The rigid skins are not completed until the final assembly, ie until the third storage of the. Vehe accurately aligned axially _s is thereby this mutual interference of the individual bearing avoided in the axial direction "

b) the bearing housing of the third bearing is opposite centered on those of the other two, and only when they are assembled, eliminating any mutual Obstruction in the axial direction. Is switched off.

These two measures are carried out during assembly, which according to the invention proceeds essentially as follows,? First, the cover 8 of the pump housing with its fit 1h- _9, the bearing housing 18 and the flange 15> as well as the pump or ■ extension shaft 12, the bearing 19b of the clamping sleeve 21, the nuts and other necessary small parts are assembled into a complete unit, which is then connected to the motor 1. The stub shaft 3 of the motor, on which the nut 24 was pushed, is pushed into the base end of the skin 12 until the flange 15 rests against the flange of the motor At this moment not yet ^{pushed onto the conical part v} ti22 of the tielle 12 »Then the motor flange 5 is firmly connected to the flange 15 of the pump housing cover by the washers 16 and nuts 17, Then the clamping sleeve 2T is on the conical part of the heads 12 pushed on so that this trowel is fastened in a precise position on the motor shaft 3 and in principle forms a unit with it (within the limits the frictional forces, which possibly

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must be taken into account for the seat) when the nut 2k is firmly tightened. In this way, the third bearing is fixed in the axial direction to the bearing k of the motor. In the mutual connection of the shafts 3 and 12, due to the play of, for example, 0.02 mm between the stub 3 and the T ¹ junction 12, a slight radial accuracy occurred prior to assembly, which resulted in unnecessary bearing loads in the radial direction brings. Such possible radial bearing loads can be eliminated by loosening the nuts 17 again somewhat and then tightening them again. The motor 1 is then completely centered with respect to the cover 8, 14, 15 of the pump housing and the rest of the assembly can be carried out. Of course, the entire pump can be assembled first and the connection of the two main parts of the unit described above can be carried out last »

Naturally, such units can be assembled in different ways with the same success, i.e. the invention can be modified in a few details without, however, departing from the basic idea the invention is disregarded. As a result, the invention is not just a matter of concern Pump units, but can also be used for all types of units that have a motor or have another drive and a working rotor coupled directly to it.

Expectations

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Claims (1)

A η s. Pr ü ch, e , 1 »J pump unit, CIa ₁ S consists of a motor and a centrifugal pump driven by it, the impeller of which is overhung, with the motor and pump having a common, practically rigid skin consisting of two parts which are practically coaxial with one another run and are connected to each other by a coupling and of which the eijje is stored in two arranged bearings and the second part, which carries the impeller, in a third bearing arranged outside the motor »characterized in that the% ^T eH lenteile (3j 12) are connected to one another by means of a self-centering coupling (21-24) which is known per se and which is surrounded by the third bearing (18, 19) arranged in the pump housing cover (8), 2, method for connecting a ■ "■ extender shaft with a motor shaft to e ner single, practically rigid Yelle in a unit according to claim 1, which is mounted in three bearings, characterized in that the extension shaft is initially in a bearing housing on the side of the motor is stored and fixed in a predetermined position axially to the motor shaft, and ztv ^r ar approximated coaxially to this, whereupon it is centered in an exactly coaxial position to the motor shaft by a self-centering coupling, through which the motor shaft and the extension shaft zn a practically rigid We'Ip each other get connected" 909810/0135 -. ■, ^8AD 3 »Method according to claim 2, characterized in that that the attachment of the extension shaft in the longitudinal direction by connecting the bearing housing takes place with the motor via a previously loose mechanical connection and this is released becomes exactly coaxial after the extension shaft zui * the motor shaft has been centered and, if necessary, adjusted with regard to its radial position and that finally achieved a rigid connection, for example by tightening connecting bolts will. Patent attorneys Dr, Tf, Andrejewski Dr. Honke gAD 909810/0135