DE102011122425A1 - Solar power plant has fixed axial sealing ring in rotatably mounted inlet pipe, which is formed approximately equal to rotatable axial sealing ring that is rotationally connected to outlet pipe - Google Patents

Abstract

The power plant has an axial sealing rotary joint which comprises a rotatably mounted inlet pipe (27) at end face, and fixed axial sealing ring (14) supported on the front side of rotatably mounted outlet pipe (28) on opposite sealing surface of rotatable axial sealing ring (15). The outlet pipe seals against fixed axial sealing ring under the spring load of diaphragm spring pact (40) and interposition of ball bearing (42). The fixed axial sealing ring in the inlet pipe is formed approximately equal to the rotatable axial sealing ring which is rotationally connected to outlet pipe.

Description

The invention relates to a solar power plant with axially sealing rotary feedthrough according to the preamble of claim 1. With the DE 10 2007 025 209 A1 Such a solar power plant with rotating device has become known. Reference is made to the disclosure there. The disclosure therein is intended to be fully encompassed by the disclosure of the present invention.

Feature of the known rotary feedthrough is that a purely radially arranged sealing arrangement is provided, which means that in the space between an outlet pipe and a housing tube, a seal package is arranged, which seals only in the radial direction. The seal is effected by sealing rings.

A purely radial seal, which does not seal axially, has the disadvantage that very high torques must be absorbed, which means that the two mutually rotatably arranged tube parts are only mutually rotatable by applying high torques.

It therefore requires drive motors with high torques to operate while maintaining the sealing effect, the rotating device under pressures of more than 100 bar and temperatures of the heat transfer medium of more than 500 ° C. The known rotary device requires high torques for operation.

With the subject of DE 10 2009 008 426 A1 Another solar power plant with rotating device and rotary feedthrough has become known, which also seals axially. For the axial sealing a one-piece sealing ring is provided, which is supported with its two opposite end faces on the mutually rotatable parts of the rotary feedthrough.

However, this creates an undesirable pipe wear, because the sealing ring is received directly on its two mutually opposite end faces in the associated housing surfaces. In addition, the sealing function is not ensured because with increasing rotation of the seal wears the only seal and then no longer reliably seals.

It is also an axial ball bearing installed, which is not secured against rotation in the direction of the pressure-exerting plate spring package. Thus, there is the disadvantage that upon rotation of the mutually rotatable parts, the axial ball bearings aufsteu and subject to high wear. Incidentally, the same disadvantage also applies to the cup spring package, which lies unprotected between the mutually rotatable parts, so that also here at the rotation of the mutually rotatable pipe socket also creates an abrasion on the radial inner or outer surfaces of the plate spring package.

In order to withstand the high pressures and temperatures while being twistable, is the subject of the DE 10 2009 008 426 A1 provided that there under the reference number 14 specified seal made of a soft material, such. B. graphite.

But there is the disadvantage of a low life of this seal and a limited twistability, because with increasing rotational frequency of the two mutually rotatable tube parts and the seal wears accordingly.

The invention is therefore based on the object, a solar power plant with axially sealed rotary feedthrough according to the subject of DE 10 2009 008 426 A1 so on form that at the same media and environmental conditions a longer life of the seal with reduced torque of the two mutually rotatable pipe parts is guaranteed.

An essential feature of the invention is that opposite to each other at the end faces of the mutually rotatable tube parts is arranged a seal consisting of two Axialdichtringen, wherein the Axialdichtring rests on an associated further sealing ring on the associated end face of the respective pipe part.

With the given seal arrangement consisting of two adjoining Axialdichtringen, which are pressed by a strong spring bias due to a cup spring package against each other, there is an improved sealing effect, because the formed between the Axialdichtringen sealing surface is held together by the strong pressure of the plate spring package with such high force that a deflection of the medium in this sealing surface is not possible.

But because these Axialdichtringe be compressed with such a high spring force, it must be ensured by appropriate choice of material that they do not wear too quickly in a mutual rotation.

For this reason, a development of the invention provides that these Axialdichtringe consist of a ceramic material, ie are therefore formed hard and accordingly have a high load capacity. This is a significant difference to the subject of the aforementioned DE 10 2009 008 426 A1 because there was used as the only sealing ring, an axially arranged graphite sealing ring made of a relatively soft material, which was afflicted with the aforementioned disadvantages.

However, in order to be able to sufficiently seal the relatively hard axial sealing rings relative to the housing contact surfaces, the invention provides, in a development, for sealing rings to be arranged on the housing surfaces which are made of a relatively soft material. In particular, mica or a comparable material is preferred for such a material, such as graphite.

Of course, for such a material, a heat-resistant plastic can be used, provided that it withstands the specified high pressures and temperatures.

The core of the invention is thus the combination of materials between the relatively hard, the actual sealing surfaces forming Axialdichtringen, which are therefore paired, which are sealed with their outer side facing each housing side faces by relatively soft sealing rings against the housing surfaces.

Thus, the particular effect is achieved that once a very high sealing pressure is generated on the sealing surface between the Axialdichtringen and on the other hand, the relatively soft, each externally applied to the Axialdichtringen other sealing rings made of a soft material and avoid crawling or trailing behind the hard Axialdichtringe.

Such a combination of materials leads to the hitherto unknown effect that with relatively little torque, the two tube parts can be rotated to each other, and that because of the hard-formed Axialdichtringe (preferably ceramic material) is given a long service life. This was not known in the prior art.

According to a further feature of the invention is also essential that the load transfer of the plate spring package takes place on the Axialdichtringe a retaining ring which is displaceable in the axial direction, but fixed in the radial direction, so that only an axial displacement can take place due to the spring force of the plate spring package However, no rotation of this ring, which would lead to undesirable wear of the plate spring package and the ring.

This ring is designed as a helical ring and is either part of an angular contact ball bearing or a sliding contact bearing.

It is important that this retaining ring on the radial outer circumference has a plurality of evenly distributed around the circumference arranged retaining tabs which engage in associated retaining recesses on the inner circumference of the stationary housing tube, so as to ensure that this angular contact ball bearing or the inclined sliding bearing forming retaining ring is not twisted, but only performs a purely axial sliding movement.

This axial sliding movement thus protects the disc spring assembly and the angular contact ball bearings or angular contact ball bearings against unintentional rotation and thus against wear and abrasion, which could be caused by rotation relative to the rotatable outlet pipe.

For the sake of clarity, it is also pointed out that in the following description of execution, it is assumed that the outlet pipe is rotatable and the housing tube and the inlet pipe are designed to be stationary. The invention is not limited thereto, because in the same way in the context of the present application, the kinematic reversal is claimed in which the inlet pipe and the housing tube are rotatable and the outlet pipe fixed. The terms "fixed inlet pipe" and "rotatable outlet pipe" are thus interchangeable and interchangeable on the assumption of interchangeability is also the scope of the independent claim 1 to understand.

Likewise, the invention is not limited to a specific flow direction, but it may be provided all the flow directions, so that the specified in the later figure description flow direction is not relevant.

There is also a similar pivot bearing assurance for the aforementioned invention Axialdichtringe pressed against each other give the sealing surface, wherein the arranged in the rotating part Axialdichtring with associated retaining tabs is supported in recesses on the rotatable part and therefore taken with this rotatable part, while the reverse arranged in the fixed part Axialdichtring with likewise provided retaining tabs on the fixed inlet pipe is latched, so as to provide a rotationally fixed connection to the fixed inlet pipe.

The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.

In the following the invention will be explained in more detail with reference to drawings showing only one embodiment. Here are from the drawings and their description further features essential to the invention and advantages of the invention.

Show it:

1 : Section through a first version of a rotary feedthrough for a solar power plant

2 : Section at the height of the retaining ring 44 in 1

3 : Section through the rotatable axial sealing ring 15 partial representation of the housing parts

4 : One opposite 1 modified embodiment in which the angular contact ball bearing is replaced by a tapered plain bearing, but all other parts are the same design

5 : Schematic representation of the principle of operation for applying the sealing pressure on the associated axial sealing rings.

In 1 In general, a rotary feedthrough is shown, which consists essentially of a fixed inlet pipe 27 exists, being close to the reference 27 the inlet pipe 27 with the reference number 13 is marked to indicate that it is a fixed inlet pipe 27 is.

Conversely, the arranged at the opposite end outlet pipe 28 with a direction arrow 12 provided to mark that the outlet pipe 28 opposite the fixed inlet pipe 27 is formed rotatable.

The medium flows, for example, in the direction of the arrow 10 through the central internal flow space 11 Through and essential is that in the space between the front of the inlet pipe 27 and the facing end of the outlet pipe 28 two preferably identical to each other Axialdichtringe 14 . 15 are arranged, which between them the crucial axial sealing surface 17 form.

The one Axialdichtring 14 is in the fixed inlet pipe 27 arranged and engages with only partially shown retaining tabs 20 in associated recesses in the inner circumference of the inlet pipe 27 one, while the other way around with the rotatable outlet pipe 28 coupled axial sealing ring 15 again according to 3 radially outwardly directed retaining tabs 20 having, in associated retaining recesses 32 on the inner circumference of the rotatable outlet pipe 28 intervention.

The sectional view in 3 with the retaining tabs 20 applies to both the fixed axial seal 14 and the rotating axial seal 15 ,

It is important now that the support of the Axialdichtringe 14 . 15 not directly on the associated pipe sides (ends), but that there associated, relatively soft sealing rings 18 . 19 are arranged, each in chambers 25 . 26 on the front side of the respective pipe 27 . 28 are used.

This is a Hinterkriechen or trailing the Axialdichtringe 14 . 15 effectively avoided, because the existing relatively hard Axialdichtringe a hard material 14 . 15 a good rotatability of the two mutually rotatable tubes 27 . 28 allow for low mutual friction and on the other hand, the relatively soft and compared to the Axialdichtringen 14 . 15 formed from a softer material frontal sealing rings 18 . 19 with high sealing pressure on the chamber walls of the chambers 25 . 26 and therefore avoid trailing. It is therefore created a very stable seal with high life and low friction.

On the outer circumference of the plate spring package 40 is a housing tube 29 screwed on, which has an associated thread 41 with the fixed inlet pipe 27 is screwed.

On the inner circumference of the housing tube 29 is in the region of a chamber-like recess, the plate spring package 40 arranged, which is supported in the axial direction on the back of the housing shoulder, wherein in the axial direction behind the housing shoulder a plain bearing 43 connected to its back with a snap ring 45 is secured against falling out. This is how it is when loosening the snap ring 45 easily possible, the plain bearing 43 to remove to disassemble the entire assembly.

The front of the disc spring package 40 rests on the vertical surface of a retaining ring 44 from the twist-secured on the inner circumference of the housing tube 29 is stored. This is on 2 where it can be seen that the retaining ring 44 radially outwardly directed and approximately uniformly distributed around the circumference arranged retaining tabs 20 having, in associated retaining recesses 30 on the inner circumference of the housing tube 29 intervention.

It is only partially shown that on the inner circumference of the retaining ring 44 the outlet pipe 28 is arranged.

The angular contact ball bearing 42 consists of evenly distributed around the circumference arranged balls 46 , wherein it is essential that each ball on an inclined wedge surface 21 of the retaining ring 44 supports and simultaneously on a cylindrical surface 22 rests. In this way, the spring force of the plate spring package 40 obliquely directed radially inward on an oppositely disposed inclined surface 23 initiated, the part of the rotatable outlet pipe 28 is.

As a result, the rotatable discharge pipe becomes 28 under the action of the angular contact ball bearing 42 with high spring force against the stationary axial sealing ring 14 pressed, resulting in an excellent seal in the area of the sealing surface 17 comes.

In another embodiment of the invention, however, it may also be provided that the inclined surface 23 designated surface is straight, which means that it represents an axial surface.

Furthermore, it is essential, the rotating axial seal 15 is in an outlet pipe 28 arranged seal receptacle 24 arranged, which is designed as an axially projecting insert, so as a radial enclosure of the Axialdichtringes 15 to ensure.

The same applies on the other side for the fixed axial sealing ring 14 , which is also included in a complete housing exception and is therefore supported in the axial direction of the housing paragraph, in which case it is essential that in the chamber 26 the existing of a soft sealing material sealing ring 18 is arranged.

The sealing force is on a large flange ring 47 applied, which is able, without deformation, the Axialdichtring 15 under high pressing force against the stationary axial sealing ring 14 to squeeze.

In 4 a further embodiment of the invention is shown, wherein the same reference numerals apply to the same parts. It is clear that the construction after 4 identical to the construction after 1 is, so the same parts in 4 already on the basis of 1 have been described. The only difference is that in 1 illustrated angular contact ball bearings 42 through an inclined sliding bearing 31 was replaced, so that previously in the area of angular contact ball bearing 42 separate areas 21 . 23 now in the angular contact ball bearings 31 coincide and this also a great sealing force from the side of the retaining ring 44 over the inclined sliding bearing 31 on the co-rotating seal 15 is produced.

With reference to the figure, the principle of operation of the invention will be explained again. With the arrow at 40 the cup spring package is shown symbolized, which is the retaining ring 44 with high force diagonally against the balls 46 of angular contact ball bearing 42 presses and thus one in the direction of the arrow 33 directed oblique force on the flange ring 47 in the rotatable outlet pipe 28 generated, so that this contact force initially on the relatively soft sealing ring 19 works, then with his strength - because he is in the chamber 25 is displaceable, this sealing force in the direction of arrow 34 on the rotating axial sealing ring 15 passes, in turn, with high contact force on the sealing surface 17 the fixed axial sealing ring 14 preloaded, in turn, in the chamber 26 against the existing of soft material sealing ring 18 is pressed, the counterforce through the front of the fixed inlet pipe 27 (symbolized by the drawn arrow) is generated.

This results in the superior sealing principle of the present invention and the advantages of the invention, which lie in the fact that at high sealing force a long life is achieved and the two mutually rotatable pipe parts 27 . 28 are rotated against each other with low torque.

LIST OF REFERENCE NUMBERS

10

Arrow direction (flow direction)

11

Flow chamber

12

direction of rotation

13

fixed direction

14

Axial seal (fixed)

15

Axial seal (rotating)

16

17

sealing surface

18

seal

19

seal

20

Retaining tab (for 30 )

21

wedge surface

22

cylindrical surface

23

sloping surface

24

seal Housing

25

chamber

26

chamber

27

Inlet pipe (fixed)

28

Outlet pipe (rotatable)

29

housing tube

30

Retaining recess (for 20 )

31

Angular bearings

32

holding recess

33

arrow

34

arrow

35

36

37

38

39

40

Belleville spring assembly

41

thread

42

Angular contact ball bearings

43

bearings

44

retaining ring

45

snap ring

46

Bullet

47

flange

48

50

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 102007025209 A1 [0001]
• DE 102009008426 A1 [0005, 0008, 0010, 0014]

Claims (9)

Solar power station with axially sealed rotary feedthrough consisting of a rotatably mounted inlet pipe ( 27 ) on whose end face an axially sealing Axialdichtring ( 14 ) is arranged, which at an opposite sealing surface ( 15 ) on the end face of a rotatably mounted outlet pipe ( 28 ) is supported, wherein the rotatably mounted outlet pipe ( 28 ) under the spring load of a disc spring pact ( 40 ) and with the interposition of a ball bearing ( 42 ) against the axial sealing ring ( 14 ), characterized in that the fixed axial sealing ring ( 14 ) in the inlet pipe ( 27 ) an approximately identically designed rotatable axial sealing ring ( 15 ), which is rotationally fixed with the rotatable outlet pipe ( 28 ) connected is. Solar power plant according to claim 1, characterized in that the two Axialdichtringe ( 14 . 15 ) consist of a hard material, preferably a ceramic material. Solar power plant according to claim 1 or 2, characterized in that the two sealing rings ( 14 . 15 ) in each case in the direction of their housing-side contact surfaces on there arranged sealing rings ( 18 . 19 ) are supported. Solar power plant according to claim 3, characterized in that the Axialdichtringe ( 14 . 15 ) made of a harder material than the respective frontally arranged sealing rings ( 18 . 19 ), which are preferably formed of a mica material. Solar power plant according to one of claims 1 to 4, characterized in that the load transfer of the plate spring packet ( 40 ) on the axial sealing rings ( 15 . 16 ) via a retaining ring ( 44 ) takes place, which is displaceable in the axial direction, but fixed rotationally fixed in the radial direction. Solar power plant according to claim 5, characterized in that retaining ring ( 44 ) on the outer circumference several evenly distributed around the circumference arranged retaining tabs ( 20 ), which in associated retaining recesses ( 30 ) on the inner circumference of a fixed housing tube ( 29 ) intervene. Solar power plant according to one of claims 1 to 6, characterized in that the retaining ring ( 44 ) one half of an angular contact ball bearing ( 42 ) or a slanted plain bearing ( 31 ), the other part of which with the outlet pipe ( 28 ) connected flange ring ( 47 ), which at its front end side there rotatably locked axial seal ( 15 ) wearing. Solar power plant according to one of claims 1 to 7, characterized in that the angular contact ball bearing ( 42 ) arranged evenly distributed around the circumference balls ( 46 ), and that each ball ( 46 ) on an inclined wedge surface ( 21 ) of the retaining ring ( 44 ) and at the same time on a cylindrical surface ( 22 ) rests. Solar power plant according to one of claims 1 to 8, characterized in that the spring force of the plate spring packet ( 40 obliquely directed radially inwardly on an oppositely disposed inclined surface ( 23 ) of the rotatable outlet pipe ( 28 ).

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