WO2016020058A1

WO2016020058A1 - Rectangular seal for sealing a feed-through, in particular for fluids

Info

Publication number: WO2016020058A1
Application number: PCT/EP2015/001610
Authority: WO
Inventors: Andreas Laage; Michail MICHAILIDIS
Original assignee: Konzelmann Gmbh
Priority date: 2014-08-08
Filing date: 2015-08-05
Publication date: 2016-02-11
Also published as: EP3201499A1

Abstract

The invention relates to a rectangular seal for sealing a feed-through, in particular for a fluid or a gas, which rectangular seal comprises a sealing body (2), an outer lateral surface (3), two flank surfaces (4a, 4b), and an inner lateral surface (7). According to the invention, the rectangular seal (1) has at least one insertion element (5a; 5b; 25a; 25b), which is provided in a flank surface (4a; 4b) and, proceeding from said flank surface, transitions into the associated lateral surface (3; 7) and which extends peripherally at least along a part of the periphery of the sealing body (2).

Description

Rectangular seal for sealing a bushing,

especially for fluids

description

The invention relates to a rectangular seal for sealing a passage, in particular for fluids, having a sealing body, an outer circumferential surface, two flank surfaces and an inner circumferential surface.

Such a rectangular seal is well known and is used in a sealing arrangement for sealing a passage, in particular a rotary feedthrough for fluids between two components, in particular a shaft and a housing. The shaft has at least one groove for receiving

CONFIRMATION COPY the rectangular seal on. For mounting the shaft in the housing, the shaft is inserted together with the rectangular seal received in its groove in a rotary guide of the housing or the housing is pushed onto the already pre-assembled shaft. There is thus a relative movement between the shaft and the housing. In the assembled state, the lateral surface of the rectangular seal inserted in the groove of the shaft abuts the inner wall of the passage of the housing and thus seals the sealing gap located between the shaft and the inner surface of the rotary union. For this purpose, the rectangular seal must be beyond the surface of the shaft, so that the sealing gap located between the shaft and the housing can be sealed by the sealing contour and / or the sealant of the rectangular seal.

Since the sealing gap is often only a few fractions of a millimeter, when inserting the shaft provided with the rectangular seal in the rotary feedthrough there is a risk that the rectangular seal is damaged. Leakage of a seal assembly using this rectangular seal can not be ruled out. The damage-free installation of a known rectangular seal in a bushing, in particular a rotary feedthrough, therefore requires a high assembly cost and is therefore time consuming. Furthermore, internal tensioning rectangular seals are known, which are inserted into a groove of the housing and through the interior of which the cylindrical shaft is pushed. Again, there is again a relative movement between shaft and housing, with the proviso that no longer - as in the case described above - the shaft is provided with the seal and is inserted into the implementation of the housing, but that the

Rectangular seal arranged in the inner wall of the implementation of the housing and the shaft must be pushed through the inner diameter. The problems described above occur here when inserting the shaft into the interior of the rectangular seal in a corresponding manner. From DE 201 21 504 U1, EP 0 231 673 B1 and from the publication SEALS, 4th edition, machine design, June 1969 and from the Engineer's Handbook of Piston Rings, Seal Rings, Mechanical Shaft Seals, published by Koppers Company, Inc. , 1975, rectangular seals are known which have a sealing body whose Ringendbereiche are separated by a shock. At a Ringendbereich a circumferentially extending, over the end face of this Ringendbereichs protruding tongue is arranged, which is insertable into a corresponding shaped recess in the other Ringendbereich. By this tongue, as well as with the cooperating recess, a seal of the rectangular seal in the region of the shock is to be achieved.

It is an object of the present invention, a rectangular seal of the type mentioned in such a way that the assembly costs, which is required for their insertion into a bushing, is reduced. This object is achieved in that the rectangular seal has at least one provided in a flank surface designed by this in the associated lateral surface over-loaded and at least along a portion of the circumference of the sealing body encircling insertion element. The inventive measures a rectangular seal is provided in an advantageous manner, in which the risk of damage to the rectangular seal when mounted in a seal assembly if not eliminated, then at least significantly reduced. The insertion element provided according to the invention has the effect that upon insertion of the rectangular seal according to the invention into a passage, its edge region, which in this process comes into contact with the abovementioned insertion element of the flank surface, this edge region slides onto the sealing body of the rectangular seal, so that the risk of damage to the sealing body and Thus, the sealing contour and / or the sealant of the rectangular seal is at least reduced in this area. Another advantage of this measure is that As a result, the assembly of the rectangular seal according to the invention is facilitated, without affecting their sealing function by the inventive measures to facilitate assembly significantly.

An advantageous development of the invention provides that the rectangular seal according to the invention in each case has an insertion element extending over at least part of the circumference on both flank surfaces. Such a measure has the advantage that in this way during assembly of the rectangular seal according to the invention no longer has to be paid to their orientation in the groove receiving them.

A further advantageous embodiment of the invention provides that at least one insertion element is designed as a Einführfase. Such a measure has the advantage that the insertion element is particularly simple. A further advantageous development of the invention provides that the rectangular seal according to the invention has a hydrostatic or hydrodynamic relief structure on its lateral surface. Such a measure has the advantage that in this way the sealing body of the invention

Rectangular seal is relieved.

Further advantageous developments of the invention are the subject of the dependent claims.

Further details and advantages of the invention can be found in the exemplary embodiments, which are described below with reference to the figures. Show it:

1 shows an illustration of a first exemplary embodiment of a rectangular seal, FIG. 2 shows a plan view of the first exemplary embodiment of FIG. 1, FIG. 3 is a sectional view of the first embodiment;

4 shows a cross section through the first embodiment on an enlarged scale,

FIG. 5 shows a schematic representation of a sealing arrangement which uses the rectangular seal according to the first exemplary embodiment, FIG. 6 shows a representation of a second embodiment of a rectangular seal,

Figure 7 is a schematic representation of a rectangular seal according to the second embodiment using the seal assembly, and Figure 8 is an illustration of a third embodiment of a rectangular seal.

FIGS. 1 to 5 show a first exemplary embodiment of a rectangular seal, generally designated 1, which has a sealing body 2 with an outer circumferential surface 3, two flank surfaces 4a and 4b, and an inner circumferential surface 7. The rectangular seal 1 has a lock 5, which is designed here as a hook lock 10. But it is also possible to use a different type of lock instead of the hook lock 10 shown here. The skilled person will be apparent from the following description that it does not depend on the specific type of training of the castle. It is also conceivable that the sealing body 2 of the rectangular seal 1 is formed closed. In the described embodiment, it is also provided that on the inner circumferential surface 7 of the sealing body 2 elevations 6 are provided, which prevents too large sagging of the inserted into a groove of a seal assembly 20 (see Figure 5) rectangular seal 1. Such

Rectangular seal is known and therefore need not be described in more detail. It is essential that - as best seen in FIGS. 3 and 4 - an insertion element 5a or 5b is arranged on at least one and in the first embodiment shown here on both flank surfaces 4a and 4b. However, it may also be sufficient for certain applications that one or both insertion elements 5a and 5b each only along a portion of the circumference of the sealing body 2 run. These insertion elements 5a and 5b serve - as described below - during insertion of the rectangular seal 1 in a passage 21 of a seal assembly 20, the edge region R of this passage 21 limiting housing G (see Figure 5) of this implementation on the respective insertion bevel 5a or 5b can slip on. As a result, the risk that during the introduction of the rectangular seal 1 in the implementation 21 - z. B. as a result of jamming - the passing in contact with the rectangular seal 1 material area of the passage 21, the sealing body 2 damaged if not completely eliminated, but at least significantly reduced. The radial course of both or at least one insertion element 5a and / or 5b is such that the insertion element 5a and / or 5b begins at least at the point at which the rectangular seal 1 emerges from the groove N of a shaft W (see FIG. 5), and that one or both insertion elements 5a, 5b preferably end in the transition region between the flank surface 4a or 4b and the outer lateral surface 3.

The insertion elements 5a and 5b are formed in the embodiment shown here as Einführfasen 5a 'and 5b'. Such a measure has the advantage of a particularly simple design of the insertion elements 5a and 5b. But it is not absolutely necessary that the insertion elements 5a and 5b on their entire area at an angle. Rather, this area can also be curved or it is also possible for the last area of the insertion elements 5a and 5b, ie the area lying just in front of the outer lateral surface 3, to be radially aligned, ie that a kind of "step" is realized ,

In Figure 5, the seal assembly 20 is shown schematically, by which the installation situation of the rectangular seal 1 is to be explained in a passage 21 and its assembly process. FIG. 5 shows a cross section through such a sealing arrangement 20, which is designed to be rotationally symmetrical with respect to an axis A. A housing G has the rotary feedthrough 21, in which a shaft W is inserted. Between the outer surface W of the shaft W and the inner surface G 'of the housing G, which limits the rotary feedthrough 21, a sealing gap D is present, which is to be sealed by the rectangular seal 1. It is known to the person skilled in the art that in this context the term "sealing" refers to compliance with critical fluid or gas leakage, the magnitude of this leakage being quite different depending on the application and having to be defined for the individual case.

To form the seal assembly 20 shown, the first

Rectangular seal 1 inserted into the groove N of the shaft W. This can be done by widening the rectangular seal 1, then pushing it onto the shaft W and finally moving it further up to the groove N in which it is to be placed and inserting it into the groove N. After the rectangular seal 1 has been introduced into the groove N of the shaft W, the shaft W is inserted into the feedthrough 21, which is designed as a rotary feedthrough in this case. The outer diameter of the shaft W is smaller by the dimension of the sealing gap D than the diameter of the passage 21 defined by the inner wall G 'of the housing G. Since the rectangular seal 1 in the mon- The state of this dynamic seal assembly 20 must close the sealing gap D, that their lateral surface 3 rests against the inner wall G 'of the housing G, the groove N of the shaft W used rectangular seal 1 at least by the dimension of the sealing gap D on the outer surface before. In general, however, the rectangular seal 1 is formed such that its outer surface defined by the outer surface 2 diameter is greater than the sum of the outer diameter of the shaft W and the dimension of the sealing gap D, so that after insertion of the rectangular seal 1 in the seal assembly 20 the Jacket surface 3 of the sealing body 2 against the inner surface G 'of the housing G is pressed. The insertion of the area of the shaft W in the leadthrough 21 in front of the rectangular seal 1 mounted in the groove N is generally easily possible, since the outside diameter of the shaft W around the sealing gap D is less than the diameter of the feedthrough 21 Inserted in the groove N used rectangular seal 1 in the passage 21, so the edge region R of the housing G comes into contact with the front in the insertion V flank region, here the flank region 4a. The described

Rectangular seal 1 has, in an advantageous manner, the insertion element 5a formed here as an introduction chamfer 5a ', which runs inclined from the lateral surface 3 to the first flank surface 4a. The edge region R of the housing G then slides on insertion of the shaft W in the insertion direction V on the insertion element 5a. As a result, the risk of damage to the sealing body 2 if not eliminated, at least reduced. It is apparent to those skilled in the art that the described embodiment of the rectangular seal 1 with insertion elements 5a and 5b facilitates the insertion of the rectangular seal 1 into the sealing arrangement 20, especially when the edge region R of the housing G, when the shaft W is moved onto the insertion elements 5a slides on, not - as shown in Figure 5 - is performed chamfered.

FIGS. 6 and 7 show a second exemplary embodiment of a rectangular seal 1, wherein the basic structure of the rectangular seal 1 of the second exemplary embodiment corresponds to that of the first exemplary embodiment, thus that the same or corresponding components provided with the same reference numerals and will not be described in detail. The essential difference between the first and the second embodiment is that in the latter the two flank surfaces 4a and 4b are designed in stages, so that due to these stages 8a and 8b of the flank surfaces 4a and 4b measured in the axial direction width of the lateral surface 3 is less than the width of the base surface 7 of the sealing body 2 is. As a result, a hydrostatic relief structure is formed. One of the seal assembly 20 of the first embodiment corresponding, the rectangular seal 1 of the second embodiment using seal assembly 20 is shown in Figure 7 again. The explanations given for Figure 5 apply here accordingly.

In the lateral surface 3 of the rectangular seal 1 of the first and the second embodiment may optionally be provided further hydrodynamic or hydrostatic relief structures.

8 shows a third embodiment of a rectangular seal 1 is shown, wherein corresponding components provided with the same reference numerals and will not be described in detail. The exemplary embodiment shown in the above-mentioned figure represents an internal tensioning rectangular seal 1 which in the case shown here exemplarily has a double T-lock 5 "as the lock 5. Such a rectangular seal 1 is formed in a groove in the inner wall G 'defining the passage 21. Accordingly, the shaft W is pushed through the inner space bounded by the inner lateral surface 7 of the main body 2 of the rectangular seal 1. The outer lateral surface 3 is in the assembled state of the rectangular seal 1 in the groove of the inner wall G 'of the housing G. received and therefore has the elevations 6 in the third embodiment, preferably.

The rectangular seal 1 has insertion elements provided in the transition region between the flank surfaces 4a and 4b and the inner circumferential surface 7 25a and 25b, which correspond to the insertion elements 5a and 5b of the first two embodiments. Upon insertion of the shaft W into the rectangular seal 1 mounted in the groove of the inner wall G ', the edge region of the shaft, which is present on the end side, then exits onto one of the here also preferably as lead-in chamfers 25a' and 25b ', depending on the orientation of the rectangular seal 1 Insertion elements 25a and 25b. The risk of damaging the sealing contour and / or the sealant of the sealing body 2 is thus counteracted again.

Again, it is again provided that preferably the rectangular seal 1 of the third embodiment on both flank surfaces 4a and 4b each have an insertion element 25a and 25b, so that here also on the orientation of the rectangular seal 1 during insertion does not need to be taken. The radial extent of the insertion elements is in turn such that they preferably begin in the radial direction at the point where the sealing body 2 of the rectangular seal 1 protrudes beyond the edge of the groove provided in the inner wall G ', and at least one insertion element 25a , 25b extends to the inner circumferential surface 7. Again, as with the first two embodiments, it is not necessary for the course of the insertion element or elements 25a, 25b to extend in a straight line over this entire area. Again, a variation of the shape is possible.

It is of course also possible for a rectangular seal 1 to have at least one insertion element 5a and / or 5b assigned to the outer lateral surface 3 and at least one insertion element 25a and / or 25b assigned to the inner lateral surface 7. The thus configured seal is shown in Figures 1 to 5. It is therefore suitable in an advantageous manner both for receiving in a groove N of the shaft W and in a groove of the inner wall G 'of the housing G. In summary, it should be noted that a rectangular seal 1 is formed by the measures described, which is characterized in that at one or both flank surfaces 4a and / or 4b at least one part of the circumference of the sealing body 2, preferably along the entire circumference of the same , extending insertion elements 5a and / or 5b or 25a and / or 25b are provided. This measure has the advantage that, as a result, the risk that during the installation of the rectangular seal 1 in the passage 21 of the seal assembly 20, the sealing body 2 is damaged, at least reduced. It is preferably provided that the insertion elements 5a, 5b or 25a and / or 25b are provided on both flank regions 4a and 4b. Such a measure has the advantage that, as a result, when inserting the

Rectangular seal 1 in the groove N no longer on the orientation of the

Rectangular seal 1 must be respected.

In the exemplary embodiment described above, it was assumed that the rectangular seal 1 serves to seal the sealing gap D between a shaft W, that is to say a rotating component, and a housing G, ie a stationary component. This is not mandatory. The measures described are equally suitable for a rectangular seal for use in a static seal assembly 20, which serves to seal a passage of a fluid or a gas.

Claims

claims

1. rectangular seal for sealing a passage, in particular for a fluid or a gas having a sealing body (2), an outer lateral surface (3), two flank surfaces (4a, 4b) and an inner circumferential surface (7), characterized in that the rectangular seal (1) comprises at least one insertion element (5a; 5b; 25a) provided in a flank surface (4a; 4b) and proceeding therefrom into the associated lateral surface (3; 7) and circulating at least along part of the circumference of the sealing body (2) 25b).

2. Rectangular seal according to claim 1, characterized in that an insertion element (5a, 5b, 25a, 25b) is provided on both flank surfaces (4a, 4b).

3. Rectangular seal according to one of the preceding claims, characterized in that at least one insertion element (5a; 5b; 25a; 25b) is formed as an insertion chamfer (5a '; 5b'; 25a '; 25b').

4. Rectangular seal according to one of the preceding claims, characterized in that at least one Einführfase (5a ', 5b', 25a ', 25b') inclined between the outer lateral surface (3) and / or the inner circumferential surface (7) and the associated flank surface (4a, 4b).

5. Rectangular seal according to one of the preceding claims, characterized in that at least one flank surface (4a, 4b) has a step (8a, 8b).

6. Rectangular seal according to one of the preceding claims, characterized in that the outer circumferential surface (3) of the rectangular seal (1) at least one radially outer insertion element (5a, 5b) is assigned.

7. Rectangular seal according to one of the preceding claims, characterized in that the inner circumferential surface (7) of the rectangular seal (1) at least one radially inner insertion element (25a, 25b) is assigned.

8. Rectangular seal according to one of the preceding claims, characterized in that the axial width of the lateral surface (3) of the sealing body (2) of the rectangular seal (1) is greater than the axial width of the base surface (7) of this sealing body (2).

9. Rectangular seal according to one of the preceding claims, characterized in that the rectangular seal (1) has at least one relief structure.

10. Rectangular seal according to one of the preceding claims, characterized in that the relief structure is a hydrostatic or hydrodynamic relief structure.

11. Sealing arrangement for sealing a passage (21) for fluids or gases between a first component (W) and a second component (G), wherein in the first component (W) a groove (N) for receiving a rectangular seal (1) is provided , characterized in that the rectangular seal (1) is designed according to one of the preceding claims.

12. Sealing arrangement according to claim 1, characterized in that the sealing arrangement (20) is a dynamic sealing arrangement, that the first component is a shaft (W) and the second component is a housing (G), and that the passage (21) is formed as a rotary feedthrough for the shaft (W).