DE102009008425A1 - Rotary hinge i.e. angle rotary hinge, for connecting non-rotating part with rotating part of high pressure device, has axial sealing ring arranged in area of contact surface and forms contact surface between bushes by axial front surface - Google Patents

Abstract

The hinge has two axially contacting sealing bushes (17, 27) that act against each other. A contact surface (22) is formed between the bushes and realizes the function of hinge in a transition between a non-rotating part and a rotating part. Each bush has a flange that sustains axially with reduced diameter into a sleeve lug. A plastic axial sealing ring (40) is arranged in an area of the contact surface and forms the contact surface between the bushes by an axial front surface. The contact surface is made of a hard metal material such as stainless steel, chromed metal or tungsten carbide.

Description

object The invention is a rotary feedthrough with axial sealing ring according to the preamble of claim 1.

The invention is based on its own DE 101 35 533 B4 out. This publication describes a rotary joint for high-pressure devices, for the connection of a non-rotating part with a rotating part, wherein between the rotating inner part and the fixed sleeve of the rotary joint two sealing, against each other and axially against each other with high-pressure medium pressure and spring pressure acted on sealing bushes are arranged, which form between them a contact surface, which realizes the sealing function of the rotary joint in the transition between non-rotating and rotating part of the joint, wherein the sealing bushes are mirror-symmetrical and are axially biased against each other with spring pressure of each spring, wherein radially to the contact surface a depression frontally connects, which acts as a pressure relief surface, and are integrally formed, wherein the two inner bores of the sealing bushes are aligned with each other and each sealing bush has a flange which is axially on closing continues with reduced diameter in a sleeve approach whose outer periphery forms the sealing surface for two spaced-apart, arranged O-rings.

at the cited document is already a hinge for a high pressure device for the connection of a not rotating part described with a rotating part, the functionally the same parts of the prior publication with the parts according to the present invention with the same reference numerals were designated.

The there shown pivot for a high pressure device represents a connection of a non-rotating part with a rotating one Part, wherein between the rotating inner part and the fixed Sleeve of the rotary joint two sealing against each other acting and axially against each other with high pressure medium pressure and druckdruckbeaufschlagte Sealing bushes are arranged, which between them a contact surface train the sealing function of the swivel joint in transition between the non-rotating and the rotating part of the joint realized.

The Sealing bushes were in this document mirror-symmetrical formed and axially biased against each other with spring pressure depending on a spring.

at has said rotary joint for high pressure devices However, it turned out that the lifetime of the in axial Direction pressed against each other and the common touch area forming sealing bushes at higher temperatures in reduce the life.

The invention is therefore based on the object, a hinge according to the subject of the DE 101 35 533 B4 educate so that it has a long life even at higher temperatures.

to Solution of the problem is the invention by the Technical teaching of claim 1 characterized.

essential Feature of the invention is that now in the area of the contact surface the now axially contacting sealing bushes according to the invention now Axial sealing ring is arranged, with its axial end face According to the invention, the contact surface forms between the sealing bushes.

In order to the essential difference with the prior art is that in the prior art, a relatively large axial sealing surface, formed by the contact surface of the two Sealing bushes was formed and in the present invention this relatively large-area axial contact surface is now greatly reduced, and that according to the invention the narrow-edged face area of the in this contact area fitted axial sealing ring.

Of the Axialdichtring acts accordingly as a narrow sealing ring with its narrow end now according to the invention the Forms contact surface. This is achieved that the previous sealing pressure between the axial, large-area Contact surfaces of the sealing bushings now concentrated on a very narrow area of the axial sealing ring becomes. As a result, much larger contact forces present and basically would also be characterized the axial seal substantially stronger in its material be claimed.

According to the invention However, provided that the Axialdichtring from a highly durable Material, eg. B. a plastic material, which in the Able to withstand high pressures at high temperatures To pass friction.

It is therefore a relatively wear-resistant axial sealing ring, the one on the opposite contact surface the sealing bush rests, said contact surface the sealing bush made of a hard metal material, such. B. one Stainless steel, chromed metal surface, tungsten carbide or the like exists.

This is to ensure that the Axial sealing ring not sunk in the surface, but only slightly incorporated into the surface of the axial sealing surface of the opposite sealing bushing, thereby providing an improved seal.

This is a significant advantage over the prior art, because in the prior art were large area axial contact surfaces between each other directed sealing bushes present what inventively avoided becomes.

These Sealing surfaces were large in the prior art Precision has been made to a large area Plant and thus also a suitable sealing surface form. This is omitted according to the present invention, because an exact processing of these sealing surfaces is not is more necessary, but only in the one sealing surface inserted into a ring-shaped annular groove of the axial sealing ring, which protrudes with its front part of this sealing surface and with its front end now according to the invention the Contact surface with the opposite axial sealing surface of the opposite Sealing bush forms.

In order to It is possible for the first time, with improved life also higher temperatures in the range of z. To control 120 degrees, where pressures up to 300 bar at speeds in the range of 2000 Revolutions per minute are manageable.

When Medium can z. For example, water with a ph value between 3 to 12 or another liquid medium, such. As oil or the like can be used.

The Invention is not alone on a simple high-pressure feedthrough directed, in which only the high-pressure medium in the axial direction is passed through the hinge.

In In another embodiment of the invention, it is provided that the same features of two superimposed sealing sleeves with an interposed Axialdichtring also at a Angular swivel can be realized.

at such an angular pivot is different from the previously described Embodiment that doubles the arrangement of sealing bushes is, d. H. there are two axially oppositely directed sealing bushes present and in the area of each touchpad Each sealing bush is now according to the invention arranged such axial seal.

From this It is clear that the invention is not limited to axial hinges is, but also extends to angular hinges and that in general the invention is based on the technical teaching, large area axially contacting sealing surfaces now characterized except to bring sealing in the area of this Sealing surfaces a narrow sealing ring in the form of an axial sealing ring is arranged, which now with its front, axial end face on the opposite axial sealing surface the opposite sealing bushing abuts.

Of the Subject of the present invention does not arise only from the subject matter of the individual claims, but also from the combination of the individual claims among themselves.

All in the documents, including the abstract Information and features, in particular the spatial shown in the drawings Training, are claimed as essential to the invention, as far as individually or in combination with the state of the art Technology is new.

in the Below, the invention is based on several execution paths illustrative drawings explained in more detail. in this connection go from the drawings and their description further essential to the invention Features and advantages of the invention.

It demonstrate:

1 : Longitudinal section through a rotary joint with an axial pressure medium feedthrough

1a : One opposite 1 modified embodiment

2 : the swivel after 1 in partial section and in perspective view

2a : One opposite 2 modified embodiment

3 : the sectional view of the two in 1 illustrated, contacting sealing bushes with the interposed axial sealing ring

4 : Front view of the right sealing bush after 3

5 : one opposite 1 modified embodiment of a rotary joint in the form of an angular pivot

In the embodiment, a rotating inner part 1 provided, which an outer thread 2 has, on which a connection fitting can be placed. The inner part 1 forms a central hole 4 from, through which the high pressure medium in the arrow direction 3 flows.

The inner part 1 is rotatable in a sleeve 12 stored, in turn, via a thread 20 which is an adhesive bond 21 has, with a fixed screw plug 18 connected is.

The gasket of the bearing between the rotating inner part 1 and the fixed sleeve 12 takes place via a lip seal 5 , which is arranged in front of the actual bearing assembly. The arrow direction 36 indicates the rotational movement of the inner part 1 opposite the sleeve 12 exercise, if this is driven accordingly.

The bearing assembly itself consists of two spaced-apart deep groove ball bearings 6 . 9 between which an axial ball bearing 8th is arranged. Of course it is also possible to have multiple thrust ball bearings 8th provide or modify the bearing assembly in any other way.

The axial ball bearing 8th has lateral Axialrillenscheiben 7 on, the part of the thrust ball bearing 8th are. The axial pulleys 7 are over a spacer 10 from the deep groove ball bearing 9 separated.

Between the deep groove ball bearing 6 and the axial ball bearing 8th is a spacer 11 built-in. The sleeve 12 is frontally over an O-ring 13 on the outer circumference of the inner part 1 sealed.

It is important now that the seal between the rotating inner part 1 and the fixed locking screw 18 by two exactly mirror images of each other arranged sealing bushes 17 . 27 takes place, which between them a contact surface 22 form, in which the sealing function takes place.

Each sealing bush 17 . 27 initially each on the front side a depression, which as a pressure relief surface 24 acts. Radial to this pressure relief surface 24 closes the front side, the contact surface 22 on, over a paragraph 28 in a radially outer flange 26 passes.

On the outer circumference of the flange 26 are here preferably opposite each other and radially outwardly directed driver 32 arranged in the associated, not shown, recesses in the area of the screw plug 18 intervention. This is the sealing bushing 17 non-rotatable with the locking screw 18 coupled. The drivers 32 however, allow an axial displacement clearance of the entire sealing bushing 17 because of this sealing bushing over a wave washer 15 spring-biased in the axial direction relative to the other sealing bushing 27 is.

Incidentally, the sealing bushing each have an inner bore 23 on, so that the two inner holes of the sealing bushes 17 . 27 exactly aligned with each other.

From the flange 26 extends axially thereafter with reduced diameter a sleeve approach 29 whose outer circumference is the sealing surface 33 for two spaced apart O-rings 14 forms.

In the same way, the other sealing bushing 27 with a wave washer 16 against the opposite sealing bush 17 spring biased.

Also this sealing bush 27 is through the wave washer 16 spring preloaded in the axial direction, but is rotationally coupled and is non-rotatable with the inner part 1 connected.

In this way rubs the circumferential sealing bushing 27 at the fixed sealing bush 17 , wherein the sealing surface is the contact surface 22 is.

The wave spring discs 15 . 16 lie in the area of the contact surfaces 30 on the flange 26 at. The respective faces of the sleeve approaches 29 form pressure surfaces 31 , This is because the respective high-pressure medium acts either in the direction of the arrow 37 or 38 so that the high pressure medium - although it is in the direction of arrow 3 flows - the two sealing bushes 17 . 27 additionally pressed against each other and thus the seal seat in the region of the contact surface 22 even better.

So it is the spring action of the wave spring washers 15 . 16 still by arranging the two pressure surfaces 31 improved, which are in the flow region of the high-pressure medium.

The two sealing bushings 17 . 27 So they are floating in a central receiving hole between the fixed screw plug 18 and the circumferential inner part 1 stored. It is therefore an axial displaceability, and the two sealing bushes can also extend radially in some ways, because they also have radial clearance in the region of the inner bore.

Fluid conducting with the contact surface 22 connected and projecting into the common recess is a relief hole 34 in the stationary sleeve 12 arranged. Does it come after a longer period to wear in Be rich of touchpad 22 , then high-pressure medium drips out of the relief hole 34 out. This is a sign, the two gaskets 17 . 27 exchange.

According to the invention, it is now provided that in the area of the contact surface 22 the two contacting sealing bushes 17 . 27 an axial sealing ring 40 is installed according to the 3 and 4 having the mentioned narrow end faces. He reaches over the right-hand side 42 according to 3 and forms a front-side interface 22 sealingly against the opposite sealing surface of the sealing bushing 17 is applied.

Thus, a large-scale sealing engagement, as has been described in the prior art, avoided, and the sealing engagement is only in the narrow end face, namely the local contact surface 22 on the front side of the Axialdichtrings 40 educated.

This requires no large-scale frontal processing of the two sealing bushings 17 . 27 but it only serves the axial sealing ring 40 Its narrow contact surface 22 under the big sealing pressure in the direction of the arrow 44 against the opposite sealing surface of the sealing bush 17 is pressed as a sealing element.

The medium tries in the direction of the arrow 45 on the axial sealing ring 40 slip past. However, this is not possible because, according to the invention, the axial sealing ring 40 in an annular groove 41 sunk in the front 42 the one sealing bush 27 is arranged.

Thus, it is preferred if the Axialdichtring 40 in cross-section approximately a rectangular profile having forward facing sharp edges 43 , the corresponding mating surfaces on the opposite axial sealing surface in the sealing bushing 17 find and easily get used to it.

Otherwise, apply to the same parts in 1 are the same description features from the earlier patent DE 101 35 533 B4 Thus, the disclosure of this prior patent is intended to be fully encompassed by the disclosure of the present invention.

The 1a shows one opposite 1 modified embodiment in which apply the same reference numerals for the same parts.

This also applies to the 2a in comparison to 2 ,

In 4 is still recognizable that the sealing bushing 27 on the circumference aligned with each other oppositely arranged driver 32 has, so that a rotationally fixed connection of the sealing bushing 27 with the rotating inner part 1 given is.

The 5 shows the same solution principle in an angular pivot, where it can be seen that an angle outlet 46 with two oppositely directed sealing bushings 27 is provided and each axially this sealing bushes 27 opposite the gaskets 17 are provided. Again, it is shown according to the invention that in the sealing bushing 17 the axial sealing ring according to the invention 40 is installed on the opposite sealing surface of the sealing bushing 27 sealing and narrow ring cross-section rests.

Otherwise, the same reference numerals apply to the same parts, it being only essential that a two-way arrangement of such axial sealing rings also occurs in the case of one angular rotary joint 40 is provided, because also a corresponding paired arrangement of sealing bushings 17 . 27 is available.

1

inner part (Rotation)

2

thread

3

arrow

4

central bore

5

lip seal

6

Deep groove ball bearings

7

Axialrillenscheibe

8th

Axialkugellager

9

Deep groove ball bearings

10

spacer

11

Distanzbuchse

12

shell

13

O-ring

14

O-ring

15

Wave washer

16

Wave washer

17

sealing bush

18

Screw

19

location hole 19 '

20

thread

21

adhesive bond

22

Touchpad (Sealing surface)

23

internal bore

24

Pressure relief area

25

26

flange

27

sealing bush

28

approach

29

sleeve extension

30

contact surface

31

print area

32

takeaway

33

sealing surface

34

relief well

35

relief channel

36

arrow

37

arrow

38

arrow

39

40

axial seal

41

ring groove

42

front

43

sharp edge

44

arrow (Sealing pressure)

45

arrow (Medium flow)

46

Winkelauslass

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10135533 B4 [0002, 0007, 0057]

Claims (12)

Rotary joint for high-pressure devices, for the connection of a non-rotating part with a rotating part, wherein between the rotating inner part and the fixed sleeve of the rotary joint, two sealing, against each other and axially against each other with high pressure medium pressure and spring pressure acted on sealing bushes are arranged, the between them Forming contact surface, which realizes the sealing function of the rotary joint in the transition between the non-rotating and rotating part of the joint, wherein the two inner holes of the sealing bushes are aligned with each other and each sealing bushing has a flange, which then axially continues with reduced diameter in a sleeve extension whose outer circumference the sealing surface for two spaced apart, arranged O-rings forms, characterized in that in the region of the contact surface ( 22 ) of the axially contacting sealing bushes ( 17 . 27 ) at least one Axialdichtring ( 40 ) is arranged, with its axial end face, the contact surface between the sealing bushes ( 17 . 27 ). Swivel joint according to claim 1, characterized in that the contact surface of the two sealing bushes ( 17 . 27 ) through the narrow-edged front side region of the axial sealing ring fitted in this contact surface ( 40 ) is formed. Swivel joint according to claim 1 or 2, characterized in that the axial sealing ring ( 40 ) made of a highly durable material, eg. As a plastic material which is able to pass high pressures at high temperatures with low friction. Swivel joint according to one of claims 1 to 3, characterized in that the opposite contact surfaces of the sealing bushes ( 17 . 27 ) made of a hard metal material, such. As a stainless steel, chrome metal surface, tungsten carbide or the like. Rotary joint according to one of claims 1 to 4, characterized in that an angular pivot of two superimposed sealing bushes ( 17 . 27 ), each with an interposed axial sealing ring ( 40 . 40 ) is formed, ( 5 ). Swivel joint according to one of claims 1 to 5, characterized in that the seal between the rotating inner part ( 1 ) and the fixed locking screw ( 18 ) by two mirror-inverted to each other arranged sealing bushes ( 17 . 27 ), which has between it a contact surface ( 22 ), in the region of which the narrow-edged face region of the axial sealing ring fitted in the contact surface is formed. Swivel joint according to one of claims 1 to 6, characterized in that each sealing bush ( 17 . 27 ) each having an indentation on the front side, serving as pressure relief surface ( 24 ) and that radially to the pressure relief surface ( 24 ) the front side of the contact surface ( 22 ), which has a paragraph ( 28 ) in a radially outer flange ( 26 ) passes over. Swivel joint according to one of claims 1 to 7, characterized in that the sealing bush ( 27 ) by a wave washer ( 16 ) spring-loaded in the axial direction and non-rotatably with the inner part ( 1 ) connected is, Swivel joint according to one of claims 1 to 8, characterized in that the circumferential sealing bushing ( 27 ) on the fixed sealing bush ( 17 ), this sealing surface is the contact surface ( 22 ) for the axial sealing ring ( 40 ). Swivel joint according to one of claims 1 to 9, characterized in that the axial sealing ring ( 40 ) in the area of the contact surface ( 22 ) of the two contacting sealing bushings ( 17 . 27 ) is installed and on the front side ( 42 ) and a front-side interface ( 22 ), which sealingly against the opposite sealing surface of the sealing bushing ( 17 ) is present. Rotary joint according to one of claims 1 to 10, characterized in that axial sealing ring ( 40 ) in an annular groove ( 41 ) sunk in the front side ( 42 ) of a sealing bush ( 27 ) is arranged Rotary joint according to one of claims 1 to 10, characterized in that axial sealing ring ( 40 ) has in cross-section approximately a rectangular profile with forward-facing sharp edges ( 43 ), the mating surfaces on the opposite axial sealing surface in the sealing bushing ( 17 ) and get used to it easily.