DE102011115007A1 - Split case for magnetic coupling for sealing e.g. pump in chemical industry, has cladding region designed as bellows assembly, which includes multiple annular corrugated bellows elements, where bellows elements are connected with each other - Google Patents

Abstract

The case (1) has a cladding region (3) designed as a bellows assembly (5), which includes multiple annular corrugated bellows elements. The bellows elements are fluid tightly connected with each other by weld joints, which are provided at an outer periphery and/or on an inner periphery of the bellows assembly. The bellows elements comprise a cross-sectional profile in Y-form, U-shape, V-shape, X-form, I-form, A-form or O-form. A pressure monitoring device is arranged at the bellows assembly. A tie rod connects a base region (2) with a flange region (4) at an end of the split case.

Description

The present invention relates to a containment shell for magnetic couplings, wherein the containment shell has a bellows arrangement on the shell region.

Crevices are known from the prior art in different embodiments. Splitters are used, for example, in magnetic couplings to seal pumps or agitators. A drive torque is transmitted through magnetic field forces through the containment shell. From the DE 20 2009 010 244.0 U For example, a containment shell with a ceramic jacket region and an additional support element is known. By using the ceramic material, eddy currents induced by the moving magnetic field are reduced. In addition to the problem of brittleness of ceramic split pots, which in the DE 20 2009 010 244.0 U is improved by the support member, ceramic containment walls are relatively expensive and expensive to manufacture.

It is therefore an object of the present invention to provide a containment shell for a magnetic coupling, which has a low generation of eddy currents with a simple design and simple, cost-effective manufacturability in operation.

This object is achieved by a split pot with the features of claim 1, the dependent claims show preferred developments of the invention.

The containment shell according to the invention for a magnetic coupling with the features of claim 1 has the advantage that eddy currents can be almost completely avoided and yet a cost-effective and feasible with conventional tools production is possible. In particular, the invention makes it possible to use metal as a material. This is inventively achieved in that the containment shell has a jacket region with a Balganordnung. The bellows arrangement has a multiplicity of bellows sections, wherein adjacent bellows sections are each directly connected to one another and an intermediate space is provided in each case between adjacent bellows sections. The bellows arrangement can effectively prevent the induction of eddy currents during operation.

Furthermore, according to the invention, a very thin-walled construction can be provided for the jacket region of the containment shell. In this case, the bellows-like jacket region according to the invention is also suitable for very high pressures. In addition to the high compressive strength and a very high chemical resistance can be achieved in a production of the Balganordnung of a metal material, in particular a high-alloy stainless steel.

In order to induce the smallest possible eddy currents, preferably the entire jacket region of the containment shell is designed as a bellows arrangement.

Preferably, the bellows arrangement is a one-piece component, for example a bellows, preferably made of metal, in particular stainless steel. This can be provided very inexpensively and without sealing problems.

Alternatively, the bellows assembly comprises a plurality of individual, annular bellows members, which are fluid-tightly connected together to form the bellows. The individual bellows elements are preferably connected to each other by means of a welded joint. As a result, although several welds between the individual bellows elements are necessary, but the individual bellows elements can be made separately very inexpensive. In this case, the individual bellows elements for forming the bellows arrangement are in each case geometrically identical. In this way, in particular a welding process for connecting the bellows elements can be simplified.

The individual bellows elements can be arranged such that in each case adjacent bellows elements are connected to one another by means of welded joints on the outer circumference and / or on the inner circumference.

More preferably, the individual bellows elements preferably have a Y-shape or a U-shape or a V-shape or an X-shape or an I-shape or an A-shape or an O-shape. In the Y-shape, the U-shape, the V-shape and the A-shape, the individual bellows elements are connected to each other at the free arm ends of the cross sections. In the X-shape, the individual cross-sectional profiles can be connected at the outer circumference and at the inner circumference at the free arms. In the I-shape, the individual bellows elements are each connected to one another in such a way that they have a zig-zag arrangement in the overall cross section of the bellows arrangement, with two I-elements forming a V-shape in section. In the O arrangement, the individual bellows elements are connected to each other in the middle. The existing of individual bellows elements Balganordnung thus corresponds in its entirety essentially a bellows, which is made of a plurality of individual bellows elements. An alternative production possibility for such a metallic bellows arrangement is, for example, a rolling bellows, which is produced from a thin-walled tube into which the folds are pressed in by rolling or hydraulically. Further Alternatively, the bellows can also be produced as corrugated bellows or as lamella bellows.

In order to further improve the compressive strength of the containment shell according to the invention, a tie rod which extends in the axial direction of the containment shell and which can absorb axial forces is preferably provided. Since at a compressive stress of the Balganordnung act through the spaces between the individual bellows sections or on the split pot bottom in each case also axial forces can be absorbed by one or more appropriately arranged tie rods this axial forces. The tie rods can extend on the outer circumference and / or on the inner circumference of the bellows arrangement between a base region and a flange region of the containment shell. Alternatively, the tie rods can also be integrated into the bellows arrangement. In this case, the bellows arrangement preferably has passage openings extending in the axial direction for receiving the tie rods. More preferably, forces in the axial direction are intercepted by axial bearings.

More preferably, the bellows arrangement comprises passage openings for heat transport. As a result, depending on the intended use, improved cooling or heating of the bellows arrangement can be made possible. Particular preference is given to each fold of the bellows arrangement a plurality of through holes arranged. Furthermore, the passage openings of adjacent folds may also be circumferentially offset to allow for improved heat transfer.

The containment pot according to the invention is preferably used in agitators or pumps, in particular in the chemical or petrochemical industry.

The invention further relates to a magnetic coupling with a split pot according to the invention.

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:

1 a schematic sectional view of a split pot according to a first embodiment of the invention,

2 1 is a schematic partial sectional view of a split pot according to a second embodiment of the invention,

3 FIG. 2 a schematic partial sectional view of a containment shell according to a third exemplary embodiment of the invention, FIG.

4 FIG. 2 a schematic partial sectional view of a containment shell according to a fourth exemplary embodiment of the invention, FIG.

5 a schematic partial sectional view of a split pot according to a fifth embodiment of the invention, and

6 a schematic partial sectional view of a split pot according to a sixth embodiment of the invention.

1 shows a section of a first embodiment of a split pot according to the invention 1 , The containment shell 1 has a cup-shaped shape with a base area 2 , a coat area 3 and a flange area 4 on. The containment shell 1 is used in a magnetic coupling, not shown, wherein a driving torque can be transmitted by magnetic field forces from an outer rotor to an inner rotor inside the split pot in a known manner.

At the coat area 3 has the containment shell 1 a bellows arrangement 5 on. In this embodiment, in the axial direction XX of the split pot, the entire jacket region 3 as a bellows arrangement 5 educated. The bellows arrangement 5 of the first embodiment is a one-piece bellows 51 from a metallic material, in particular a high-alloyed stainless steel. A wall thickness of the bellows 51 is chosen very low. The bellows has in a known manner between individual bellows sections an inner space 9 or an outer space 8th on.

Thus, the bellows 51 on the one hand a secure seal between an inner area and an outer area of the split pot 1 ensure and further eddy current losses during operation through the use of Balganordnung 5 be further reduced. The combination of the thin-walled bellows and the inner and outer spaces 8th . 9 reduced during operation, the formation of eddy currents in a significant manner, so that according to the invention reduced transmission losses of torque can be realized. In this case, the one-piece bellows 51 very inexpensive and easy to manufacture. At the base area 2 or the flange area 4 the containment shell can be the bellows 51 be fixed fluid-tight, for example by means of welded joints. Another advantage of using the bellows element results from the fact that possibly larger surfaces for heat transfer between the interior and the outer region of the split pot are possible.

In the following embodiments, the same or functionally identical parts with denoted by the same reference numerals as in the previous embodiment.

2 shows an alternative design of the containment shell 1 according to a second embodiment of the invention. In the second embodiment, the bellows assembly is constituted by a plurality of annular bellows members 52 formed with a cross section in I-shape. The individual bellows elements are each at a radially outer circumference by means of an outer weld 8th with an adjacent bellows element 52 connected and additionally on an inner circumference by means of an inner weld 7 with another adjacent bellows element 52 connected.

This results in a Balganordnung 5 similar to that of the first embodiment, which is not provided by a one-piece bellows, but by a plurality of I-shaped bellows elements 52 which are welded together. The bellows order thus produced 5 is over two more welds 11 . 14 with the base area 2 or the flange area 4 connected (cf. 2 ). Although in the production of this bellows order 5 a variety of circumferential welds necessary, however, the individual bellows elements 52 be made very easy.

At the in 3 shown third embodiment of the containment shell 1 includes the bellows arrangement 5 in cross-section substantially U-shaped bellows elements 53 , The U-shaped bellows elements 53 are at their free ends in each case by means of external welds 6 connected with each other. The advantage of this bellows arrangement 5 of the third embodiment lies in a reduced number of welds, so that in particular the production time for such a bellows arrangement can be reduced.

4 shows a containment shell 1 according to a fourth embodiment, which in cross-section annular bellows elements 54 having a Y-shape. Adjacent bellows elements are, similar to the third embodiment, on the outer circumference by means of external welds 6 connected with each other. Depending on the length of the two consecutive arms of the Y-shaped bellows element 54 and, depending on the length of the radially to the axial axis XX extending stem portion of the Y-shaped bellows elements can thereby larger or smaller inner and outer spaces 8th . 9 be formed. In the in 4 shown third embodiment are exemplarily larger internal spaces 9 as outer spaces 8th intended. However, this can also be the other way round.

5 shows a containment shell 1 according to a fifth embodiment of the invention, in which the bellows arrangement 5 from a variety of annular bellows elements 55 are made in cross section in X-shape. The X-shaped bellows elements 55 are both by means of an outer weld 6 as well as an inner weld 7 connected with each other. This results between the individual bellows elements 55 an inner space 12 , Further, each X-shaped bellows element 55 a central passage opening 56 on, which in each case in the axial direction XX of the split pot 1 runs. How out 5 is apparent, is a tie rod 13 through the passage openings 56 guided. Here, the tie rod serves 13 for absorbing axial loads caused by the use of the bellows arrangement 5 can occur as a cladding region of the containment shell. The tie rod 15 is here at the base area 2 and at the flange area 4 fixed, for example by welding. It should also be noted that preferably a plurality of tie rods are provided evenly distributed along the circumference of the jacket region. For example, three or four tie rods are provided.

6 shows a jacket portion of a split pot according to a sixth embodiment of the invention. This includes the bellows order 5 bellows elements 54 in Y-shape, wherein the individual bellows elements are connected to adjacent bellows elements respectively by means of an outer weld. The bellows elements 54 have through holes 57 . 58 for a targeted heat transfer on. How out 6 it can be seen, the through holes 57 . 58 in each case adjacent bellows elements 54 offset in the circumferential direction to each other. This results in an improved heat transfer to the bellows order 5 , The arrows A indicate the flow through the passage opening 57 . 58 at. The medium used for heat transfer is supplied from the inside of the split pot. Further, on the inner circumference of the bellows arrangement 5 a cover cylinder 15 arranged. The cover cylinder 15 serves to chamber and guide the flow through the through holes 57 . 58 , Furthermore, the cover cylinder is used 15 to protect against corrosion and contamination of the bellows 5 , Also, on the inside of the shell area by the use of the cover cylinder 15 a possible hydraulically smooth surface can be generated. The cover cylinder has a smaller thickness than the bellows element, wherein a thickness of the cover cylinder 15 minimally selected. Furthermore, at the bellows order 5 a pressure sensor 16 arranged to monitor a pressure on the containment shell. The pressure sensor 16 is preferably in a gap between individual bellows elements 54 arranged so that no additional space for the pressure sensor is necessary. By means of the pressure sensor, in particular a Wear monitoring of the containment shell be integrated into the containment shell to early damage to the containment shell, which would lead to pressure changes on the pressure sensor, can detect.

It should also be noted that tie rods can also be used in the other described embodiments. The tie rods can also radially within the Balganordnung 5 , or radially outside the bellows arrangement 5 , ie, on the outside of the containment shell, are guided. It should also be noted that in all the described embodiments it is also possible to provide additional thin-walled cover cylinders on the inner periphery and / or on the outer circumference of the jacket region for covering the respective bellows arrangements 5 provided. This can be avoided in particular that deposits in the inner and outer spaces 8th . 9 the bellow order 5 can form. The cover cylinders also allow a targeted flow guidance on the inner or outer circumference of the jacket region

LIST OF REFERENCE NUMBERS

1

containment shell

2

base region

3

cladding region

4

flange

5

bellows

6

outer weld

7

inner weld

8th

outer space

9

inner space

10

tie rods

11

Weld

12

closed space

13

tie rods

14

Weld

15

deck cylinder

16

pressure sensor

51

one-piece bellows

52

Balgelement in I-shape

53

Bellows in U-shape

54

Bellows in Y-shape

55

Balgelement in X-shape

56

Passage opening for tie rods

57, 58

Passage opening for heat transport

X X

central axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202009010244 U [0002, 0002]

Claims (12)

Slit pot for a magnetic coupling comprising: - a base region ( 2 ), and - a cladding region ( 3 ), - wherein the cladding region ( 3 ) a bellows arrangement ( 5 ). Losspan according to claim 1, characterized in that the entire jacket area ( 3 ) as a bellows arrangement ( 5 ) is trained. Loss pot according to one of the preceding claims, characterized in that the bellows arrangement is a one-piece bellows ( 51 ). Loss pot according to one of claims 1 or 2, characterized in that the bellows arrangement a plurality of individual, annular bellows elements ( 52 ; 53 ; 54 ; 55 ), which are fluid-tightly connected to each other. Losspan according to claim 4, characterized in that the bellows elements ( 52 ; 53 ; 54 ; 55 ) each by means of a welded joint ( 6 . 7 ) are interconnected. Leaking pot according to claim 5, characterized in that the welded joints on the outer circumference and / or on the inner circumference of the Balganordnung ( 5 ) are provided. Loss pot according to one of claims 4 to 6, characterized in that the bellows elements ( 5 ) have a cross-sectional profile in Y-shape or U-shape or V-shape or X-shape or I-shape or A-shape or O-shape. Loss pot according to one of the preceding claims, characterized by a device ( 16 ) for pressure monitoring, which at the Balganordnung ( 5 ) is arranged. Loss pot according to one of the preceding claims, characterized by at least one tie rod ( 13 ), which is the base area ( 2 ) with a flange area ( 4 ) at another end of the containment shell. Leakage pot according to claim 9, characterized in that the bellows arrangement passage openings ( 56 ), through which the tie rod ( 13 ) is passed. Loss pot according to one of the preceding claims, characterized by a at the inner periphery and / or outer periphery of the shell region ( 3 ) arranged cover cylinder ( 15 ). Loss pot according to one of the preceding claims, characterized in that the bellows arrangement ( 5 ) Passage openings ( 57 . 58 ) for a heat transport.

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