Conveying mechanism and slip ring sealing device having such conveying mechanism

Abstract

The invention relates to a delivery mechanism for delivering a liquid, comprising a rotatable part (61) and a stationary part (62), a delivery gap (63) being provided between the rotatable part (61) and the stationary part (62), and a Tesla-valve-like delivery channel (63) being formed on the rotatable part (61) and / or on the stationary part (62), wherein the flow resistance of the feed channel (63) in one flow direction is greater than the flow resistance in the other flow direction.

Description

Technical Field

[0001] The invention relates to a conveying mechanism, in particular a conveying mechanism of a slide ring seal, for conveying a liquid in an axial direction, and a slide ring seal device having a slide ring seal and the conveying mechanism according to the invention. Background Art

[0002] In connection with slide ring seals, conveying means, for example as conveying threads, are known for conveying cooling liquid and / or barrier fluid in the direction of the slide ring and the sealing gap. Such a conveying thread is known, for example, from DE 10 2011118477A1. This document discloses a conveying thread with a floating bearing to prevent the conveying thread from coming into contact with the surrounding housing side during operation. A disadvantage of all conveying threads known to date is that the conveying direction in the conveying thread is reversed when the direction of rotation at the shaft is reversed. As a result, when using such conveying threads, it cannot always be ensured that enough cooling liquid or barrier fluid is conveyed to the desired location. Summary of the invention

[0003] The object of the present invention is to provide a conveying mechanism for conveying liquids, which conveying mechanism can realize reliable conveying of large conveying quantities with a simple structure and simple, low-cost manufacturability. The object of the present invention is also to provide a sliding ring seal device with a conveying mechanism, which conveys a sufficient amount of liquid in all operating states.

[0004] This object is achieved by a conveying mechanism having the features of the following technical solutions and a slide ring seal having the features of the following technical solutions. The dependent technical solutions show preferred developments of the invention.

[0005] Accordingly, the conveying mechanism for conveying liquid according to the present invention having the following technical solution has the following advantages, that is, a larger amount of liquid, such as cooling liquid or barrier fluid, can also be conveyed, especially to the slide ring seal. The conveying mechanism can also be used to convey lubricants or other liquids. Here, the conveying mechanism according to the present invention includes a rotatable part and a stationary part. A conveying gap is provided between the rotatable part and the stationary part, and the liquid to be conveyed is conveyed via the conveying gap. In addition, a Tesla conveying channel with a Tesla valve-like structure is provided at least at the rotatable part or the stationary part. The Tesla valve-like conveying channel has a structure similar to that of a Tesla valve, and the Tesla valve is a check valve without a movable mechanical component. Here, the flow resistance of the Tesla valve-like conveying channel in one conveying direction is greater than the flow resistance in the opposite conveying direction. Therefore, backflow blocking is achieved in the opposite direction by the fluid dynamic effect. The Tesla valve-like conveying channel is completely constructed in the rotating part or the stationary part, or the Tesla valve-like conveying channel is constructed in the rotating part and the stationary part respectively.

[0006] Preferably, the Tesla valve-shaped delivery channel has a large number of alternately arranged narrowing regions and widening regions. The widening region is preferably a sheet-like or planar widening portion, or alternatively a separate flow channel, which has a longer flow length than the main channel of the Tesla valve-shaped delivery channel.

[0007] The widening region is preferably configured in an arc shape. The widening region is arranged alternately left and right along the through-flow direction at the conveying channel axis.

[0008] The delivery channel is preferably arranged at an acute angle α to the axial direction. Preferably, the acute angle α to the axial direction XX of the delivery mechanism is in the range of 60° to 89°, preferably 70° to 80°. The delivery rate can be influenced by selecting the angle α.

[0009] Particularly preferably, the delivery mechanism comprises a plurality of Tesla valve-shaped delivery channels arranged parallel to one another. Thus, when delivering in the axial direction XX, the liquid is also transferred from the first delivery channel to the adjacent second channel. Preferably, the Tesla-shaped delivery channels are respectively completely formed in the side surface of the rotating part and / or the stationary part.

[0010] A particularly simple construction is possible if the rotatable component is a ring on the outer circumference of which the conveying channel is arranged, or if the stationary component is a ring on the inner circumference of which the conveying channel is arranged. When the conveying channel is arranged at the outer circumference, the rotatable component can be fastened in a simple manner, for example, to a shaft or the like. When the conveying channel is arranged at the inner circumference, the components of the conveying mechanism can be fixed to a housing or the like. Preferably, the ring and the shaft are one-piece components, so that the ring is integrated into the shaft.

[0011] According to a particularly preferred embodiment of the present invention, at least one first Tesla valve-like delivery channel is arranged on a rotatable component, and at least one second Tesla valve-like delivery channel is arranged on a stationary component, thereby enabling delivery independent of the rotation direction.

[0012] Preferably, all supply channels on the rotatable part and / or on the stationary part are designed to be identical in terms of geometry.

[0013] Particularly preferably, the first Tesla valve-shaped delivery channel and the second Tesla valve-shaped delivery channel are arranged at an acute angle to the axial direction, wherein the first delivery channel and the second delivery channel are oriented in the same direction. It is thereby possible that the delivery direction of the delivery mechanism can remain unchanged even when the direction of rotation of the rotatable component is reversed. In other words, the delivery mechanism delivers in a first direction in the case of a first direction of rotation, and when the delivery mechanism is reversed to a direction opposite to the first direction of rotation, the delivery mechanism still delivers in the first direction. This can be particularly advantageously used for the following slide ring seals: the slide ring seal must be sealed and isolated at a rotating component whose direction of rotation changes during operation. As a result, regardless of the direction of rotation of the rotating component, the delivery mechanism for such a slide ring seal can safely and in the required large amount deliver cooling liquid and / or barrier liquid to the slide ring seal.

[0014] The present invention also relates to a slide ring sealing device, which comprises a slide ring seal having a rotating slide ring and a stationary slide ring, wherein the rotating slide ring and the stationary slide ring define a sealing gap between their sliding surfaces. The slide ring sealing device comprises the conveying mechanism as described above.

[0015] The slide ring seal device preferably further comprises a barrier fluid mechanism, wherein the delivery mechanism according to the invention delivers a barrier fluid to the sealing gap of the slide ring seal. Further preferably, the slide ring seal device comprises a cooling mechanism, wherein the delivery mechanism according to the invention delivers a cooling liquid to the slide ring seal.

[0016] The delivery device according to the invention can also be used preferably as a lubricant pump, for example for supplying lubricant to bearings or other rotating components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the accompanying drawings:

[0018] Figure 1 A schematic cross-sectional view of a slide ring seal device having a conveying mechanism according to a first embodiment of the present invention is shown,

[0019] Figure 2 Shows Figure 1 A schematic top view of a rotatable part of a conveying mechanism,

[0020] Figure 3 Show Figure 1 A schematic cross-sectional view of the stationary parts of the conveying mechanism,

[0021] Figure 4 Shows Figure 1 A schematic diagram of an expanded form of a Tesla valve-shaped delivery channel of a delivery mechanism;

[0022] Figure 5 shows that in the case of reverse rotation direction, Figure 1 A schematic cross-sectional view of a slide ring seal of a conveying mechanism, and

[0023] Figure 6 A schematic sectional view of a mechanical slide seal having a conveying mechanism according to a second exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0024] The following reference Figures 1 to 5 A slide ring seal device 1 according to a first preferred embodiment of the present invention is described in detail.

[0025] As from Figure 1 As can be seen in FIG. 1 , the slide ring seal device 1 comprises a slide ring seal 2 having a rotating slide ring 3 and a stationary slide ring 4. A sealing gap 5 is defined between the sliding surfaces of the rotating slide ring 3 and the stationary slide ring 4.

[0026] In this case, the mechanical seal 1 seals a product area 11 on the shaft 9 from an area 12 to be sealed.

[0027] The rotating slip ring 3 is connected to the shaft 9 via a sleeve 10 . The stationary slip ring 4 is fixed to the housing 8 .

[0028] The slide ring seal device 1 further comprises a conveying mechanism 6, which is configured to convey the liquid. Figure 1 As can be seen in FIG. 6 , the conveying mechanism 6 comprises a rotatable component 61 and a stationary component 62. The rotatable component 61 is arranged directly at the shaft 9. The stationary component 62 is arranged at the housing 8.

[0029] A conveying gap 60 is arranged between the rotatable part 61 and the stationary part 62. The conveying device 6 conveys in the axial direction XX of the slide ring seal, wherein Figure 1 The flow of the liquid in the through-flow direction 7 is shown in FIG.

[0030] The rotatable part 61 and the stationary part 62 each have one or more conveying channels 63. The conveying channels are constructed as Tesla valve-like conveying channels. Each of the conveying channels is completely constructed in the rotating part and the stationary part.

[0031] Figure 2 The rotatable part 61 of the conveying mechanism 6 is shown in detail. Figure 2 As can be seen in FIG. 6 , a plurality of conveying channels 63 arranged parallel to one another are arranged at the rotatable component 61. The conveying channels 63 are arranged in this case at an acute angle α to the axial direction XX (see FIG. 6 ). Figure 2 ).

[0032] Figure 3A cross-sectional view of the stationary part 62 of the conveying mechanism 6 is schematically shown. Figure 3 It can be seen in FIG. 1 that the stationary component 62 has a plurality of conveying channels 63 at its inner circumference, which are also arranged at the inner circumference at the same angle α relative to the axial direction XX. Here, the plurality of conveying channels 63 are also arranged parallel to each other.

[0033] As from Figure 2 and Figure 3 A comparison between the two directly shows that the conveying channels are oriented in the same direction in the rotatable part 61 and the stationary part 62. Therefore, the conveying channels 63 of the rotatable part 61 and the stationary part 62 extend parallel to each other.

[0034] Figure 4 The conveyor channel 63 is schematically shown in its developed form. The conveyor channel is designed in the same way in the rotatable part 61 as in the stationary part 62 .

[0035] from Figure 4 As can be seen in the figure, each conveying channel 63 has a narrowing region 64 and a widening region 65. Each conveying channel 63 has a large number of narrowing regions 64 and widening regions 65 arranged alternately. The widening region 65 is a planar, arc-shaped region, which is arranged alternately left and right along the main direction at the conveying channel axis YY in a sheet-like manner. A narrowing region 64 is correspondingly arranged between two widening regions 65. This design scheme results in that the flow resistance in one direction of the conveying channel 63 is greater than the flow resistance in another direction of the flow channel.

[0036] In order to be able to convey in the same axial direction regardless of the direction of rotation, the Tesla valve-like conveying channel 63 is arranged on the stationary part 62 of the conveying mechanism 6 in the same direction and at the same angle as on the rotatable part. Figure 1 As shown, the liquid is transported through the transport gap 60 along the flow direction 7 by means of the transport channel 63 in the rotatable part 61 in the first rotation direction A, wherein the transport channel in the stationary part blocks the fluid passage by the fluid dynamic effect. Figure 5 As shown, in the case of the opposite rotation direction B, the delivery channel 63 of the rotatable part 61 is blocked, while the liquid is delivered in the delivery channel 63 of the stationary part 62, so that it is delivered through the delivery gap 60 in the same direction (throughflow direction 7) by means of the delivery channel 63 in the stationary part 62. Since the angles and geometries of the delivery channels 63 in the rotatable part and the stationary part are the same, the amount of liquid delivered is also the same.

[0037] Therefore, the delivery capacity of the delivery mechanism, which is independent of the direction of rotation, can always be achieved in the same direction through the delivery gap 60. It should be noted that by changing the angle α at the rotatable part and the stationary part depending on the direction of rotation, it is also possible to preferably deliver different amounts of delivery. Therefore, the present invention can provide a delivery mechanism 6 that can deliver the same or different amounts of liquid in the same direction in a manner independent of the direction of rotation of the rotatable part 61.

[0038] Since in the first embodiment the width B1 of the rotatable part 61 and the width B2 of the stationary part 62 of the conveying mechanism 6 are the same and the angle α is also the same, the amount of liquid conveyed in the throughflow direction 7 is the same regardless of the rotation direction (A or B).

[0039] Figure 6 FIG. 2 shows a slide ring seal device 1 according to a second embodiment of the present invention. The same or functionally identical components are marked with the same reference numerals as in the first embodiment. Figure 6 As can be seen in the figure, the conveying mechanism 6 of the second embodiment has a rotatable component 61, which, as in the first embodiment, includes a conveying channel 63 with a narrowing area 64 and a widening area 65. The rotatable component 61 is arranged directly at the shaft 9. The stationary component 62 of the conveying mechanism 6 is formed by the circumferential wall 80 of the housing 8 in the second embodiment. Therefore, the conveying mechanism 6 of the second embodiment has a significantly simplified structure and only includes a conveying channel 63 of the Tesla valve type at the rotatable component 61. If the conveying channel 63 of the rotatable component 61 is arranged in an acute angle to the axial direction XX as in the first embodiment, a large amount of conveying is achieved along the flow direction 7, and in the case of a reversal of the rotation direction, the amount of conveying is significantly reduced and tends to zero. The second embodiment is particularly considered for the following application, in which the rotation direction of the shaft 9 to be sealed does not reverse. As a result, the structure of the conveying mechanism 6 can be designed in a simpler and less costly manner. In other respects, this embodiment corresponds to the first embodiment, so that reference can be made to the description given there.

[0040] In addition to the above written description of the invention, reference is hereby made expressly to Figures 1 to 6 The illustrations of the present invention in the accompanying drawings are provided to supplement the disclosure thereof.

[0041] Description of Reference Numerals

[0042] 1 Slide ring seal device

[0043] 2 Slide ring seals

[0044] 3 Rotating slip ring

[0045] 4Stationary slip ring

[0046] 5 Sealing gap

[0047] 6Conveying mechanism

[0048] 7 Flow direction through the conveying gap

[0049] 8 Shell

[0050] 9-axis

[0051] 10 sleeves

[0052] 11Product Area

[0053] 12 Area to be sealed

[0054] 60 Conveying gap

[0055] 61 Rotatable parts

[0056] 62 Stationary parts

[0057] 63 Conveyor Channel

[0058] 64 Narrowing area

[0059] 65 Variable Width Area

[0060] 80 Circumferential wall

[0061] AFirst direction of rotation

[0062] B A second rotation direction opposite to the first rotation direction

[0063] B1 Width of the rotatable part

[0064] B2 Width of stationary part

[0065] XX Axial direction

[0066] YY Conveying channel axis

[0067] α Angle

Claims

1. A conveying mechanism for conveying liquids, including - a rotatable element (61) and - a stationary part (62), - wherein a conveying gap (63) is provided between the rotatable part (61) and the stationary part (62), and - wherein a Tesla valve-like supply channel (63) is formed on the rotatable part (61) and / or the stationary part (62), wherein the supply channel (63) has a flow resistance in one flow direction that is greater than a flow resistance in another flow direction.

2. The conveying mechanism according to claim 1, wherein the conveying channel (63) has a large number of alternately arranged narrowing areas (64) and widening areas (65).

3. The conveying mechanism according to claim 2, wherein the widening regions (65) are constructed in an arc shape and are arranged alternately along the flow direction through the conveying channel (63) at the conveying channel axis (YY).

4. The conveying device according to any of the preceding claims, wherein the conveying channel (63) is arranged at an acute angle (α) to the axial direction (XX). 5 . The conveying mechanism according to claim 4 , wherein the acute angle (α) is in the range of 60° to 89°.

6. The conveying device according to any of the preceding claims, comprising a plurality of conveying channels (63) arranged parallel to one another.

7. A conveying mechanism according to any one of the preceding claims, wherein the rotatable component (61) is a ring, wherein the conveying channel (63) is arranged at the outer periphery of the ring, and / or wherein the stationary component (62) is a ring, wherein the conveying channel (63) is arranged at the inner periphery of the ring. 8 . The conveying device according to claim 1 , wherein all conveying channels ( 63 ) are designed to be identical in terms of geometry.

9. The conveying mechanism according to any one of the preceding claims, wherein the conveying channel (63) of the rotatable part (61) and the conveying channel (63) of the stationary part (62) are arranged at the same angle (α).

10. A sliding ring sealing device, comprising - a slide ring seal (2) having a rotating slide ring (3) and a stationary slide ring (4), which define a sealing gap (5) between their sliding surfaces, and - A conveying device (6) according to any one of the preceding claims.

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