Axially Mountable Slip Ring Seal Assembly

Abstract

The present invention relates to a slip ring sealing device, which comprises: a first slip ring seal (2) having a rotating slip ring (21) and a stationary slip ring (22), a sealing gap (23) being defined between the rotating slip ring and the stationary slip ring; a sleeve (4); a driving member (5) that connects the sleeve (4) to the rotating slip ring (21) and is designed to transmit the rotation of the sleeve (4) to the rotating slip ring (21); a connecting device (6) for connecting the sleeve (4) to the driving member (5), the connecting device (6) comprising at least two rotating locks (60) and at least two grooves (40) in the sleeve (4), wherein each rotating lock (60) has a supporting portion (61) and a locking portion (62), the locking portion (62) protruding laterally from the supporting portion (61), and the rotation axis (Y-Y) of each rotating lock (60) is parallel to the central axis (X-X) of the sleeve (4).

Description

Technical Field

[0001] The present invention relates to a slip ring sealing device which allows for simplified installation from the axial direction. Background Art

[0002] Slip ring seals with various designs are known from the prior art. Sealing using a slip ring sealing device is accomplished at one end of the shaft or near one end of the shaft. Due to installation space problems, machines are typically designed to use a slip ring sealing device that is as short as possible axially. An attempt is made to install the slip ring sealing device as far as possible in the direction of the portion to be sealed axially. However, since the slip ring sealing device is usually fixed to a bushing connected to the shaft, this can lead to assembly problems. A so-called driving member is used to transmit the rotational force from the bushing connected to the shaft to the rotating slip ring. The driving member is firmly connected to the bushing so that torque is transmitted from the bushing to the rotating slip ring via the driving member. To date, this has been accomplished, for example, by establishing a threaded connection radially between the driving member and the bushing. However, since it is not possible to reach the interior of the housing with tools to radially fix the driving member to the bushing or loosen it from the bushing by screws, if the slip ring sealing device is configured too deeply axially within the housing, it is no longer possible to establish such a radial connection. Summary of the Invention

[0003] Therefore, an object of the present invention is to provide a slip ring sealing device which can be configured very deeply inside a machine housing and has a simple structure and simple, low-cost manufacturability.

[0004] This object is achieved by a slip ring sealing device having the features of claim 1. The dependent claims show preferred further embodiments of the present invention.

[0005] Thus, the slip ring seal device having the features of claim 1 according to the present invention has the advantage that the slip ring seal device can be installed very deeply in the inner region of the machine housing. As a result, the overall axial length of the machine can be significantly reduced because the slip ring seal device, which is usually arranged at one end of the shaft or near one end of the shaft, can be positioned very deeply inside the housing. According to the present invention, this is achieved by a slip ring seal device which includes a first slip ring seal, a rotating slip ring and a stationary slip ring which define a sealing gap therebetween. Additionally, the slip ring seal device includes a sleeve and a driving member which connects the sleeve to the rotating slip ring for torque transmission. This allows torque to be transmitted from the sleeve connected to the rotating shaft to the rotating slip ring via the driving member. Additionally, connecting means are provided for connecting the driving member to the sleeve, the connecting means including at least two rotary locks and at least two grooves in the sleeve. Each rotary lock includes a supporting portion and a locking portion, the locking portion protruding laterally from the supporting portion. The axis of rotation of each rotary lock is parallel to the central axis of the sleeve. This allows the rotary locks to be actuated from the axial direction from outside the housing and to engage with the grooves in the sleeve by twisting. This enables torque to be transmitted from the sleeve to the driving member and from the driving member to the rotating slip ring connected to the driving member. Here, the form-fit connection between the sleeve and the driving member is achieved by the connecting means. There is a form-fit between the connecting means and the sleeve and between the connecting means and the driving member. In this case, the form-fit between the connecting means and the sleeve is achieved by rotating the connecting means, preferably by 90°.

[0006] Further preferably, the rotary lock includes a tool receiving portion. This allows the rotary lock to be easily rotated from the axial direction. For example, the tool receiving portion is a slot or a cross slot for a screwdriver or the like or an inner polygon or an outer polygon of the rotary lock.

[0007] Particularly preferably, the supporting portion of the rotary lock is a cylinder configured in a cylindrical recess of the driving member. This allows the rotary lock to be reliably and easily inserted into the driving member and rotated. Thus, the driving member serves as a support for the rotary lock. Preferably, the cylindrical axis of the supporting portion defines the axis of rotation of the rotary lock.

[0008] According to another preferred embodiment of the present invention, the length of the locking portion is at least twice the diameter of the cylindrical supporting portion.

[0009] For particularly simple and inexpensive manufacture, the grooves in the sleeve for receiving the rotary locks preferably have an arcuate bottom.

[0010] Further preferably, the free end of the locking portion is also arcuate. Preferably, a first radius of the arcuate bottom of the sleeve is equal to a second radius of the free end of the locking portion of the rotary lock. This allows the rotary lock to pivot easily about the cylinder axis.

[0011] According to another preferred embodiment of the present invention, the first rotary lock can be rotated to lock in a first rotational direction, and the second rotary lock can be rotated to lock in a second rotational direction, which is opposite to the first rotational direction. This ensures that torque can be transmitted from the sleeve to the driving member in both rotational directions.

[0012] To enable particularly safe torque transmission, the connecting device further includes a fixing device for fixing the position of the rotary lock in the groove of the sleeve. Preferably, the fixing device is a fixing screw that is adjacent to the rotary lock and screwed into the driving member. This prevents the rotary lock from rotating in the sleeve in the locked position.

[0013] To ensure torque transmission in both rotational directions, the first locking screw is preferably arranged on the first circumferential side of the first rotary lock, and the second locking screw is arranged on the second circumferential side of the second rotary lock, which is opposite to the first circumferential side. As a result, the first rotary latch is fixed in the first rotational direction and the second rotary latch is fixed in the second rotational direction.

[0014] Further preferably, the slip ring sealing device includes a second slip ring seal having a rotating slip ring and a stationary slip ring, with a sealing gap defined between the rotating slip ring and the stationary slip ring. This means that the slip ring sealing device is arranged in a series configuration. In this case, similar to the first slip ring seal, the second slip ring seal is fixed to the sleeve using preferably the same connecting device.

[0015] Preferably, the slip ring sealing device is used in a pump or a compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which

[0017] Figure 1 is a schematic cross-sectional view of the slip ring sealing device in the installed state with the connecting device locked,

[0018] Figure 2 is a schematic cross-sectional view of the Figure 1 slip ring sealing device in the unlocked state,

[0019] Figure 3 is Figure 1 a schematic enlarged partial cross-sectional view of the slip ring sealing device,

[0020] Figure 4 is Figure 1 a schematic perspective view of the rotary lock of the slip ring sealing device,

[0021] Figure 5 is a schematic top view of the Figure 1 slip ring sealing device in the unlocked state, and

[0022] Figure 6 is in a locked and fixed state Figure 1 Schematic top view of the slip ring sealing device Detailed implementation mode

[0023] Next, while referring to Figures 1 to 6 the slip ring sealing device 1 according to the preferred implementation mode of the present invention will be described in detail

[0024] As can be seen from Figure 1 the slip ring sealing device 1 includes a first slip ring seal 2 and a second slip ring seal 3. The first slip ring seal 2 includes a rotating slip ring 21 and a stationary slip ring 22, and a sealing gap 23 is defined between the rotating slip ring 21 and the stationary slip ring 22. The second slip ring seal 3 includes a rotating slip ring 31 and a stationary slip ring 32, and a sealing gap 33 is defined between the rotating slip ring 31 and the stationary slip ring 32. The first slip ring seal and the second slip ring seal are arranged in series with each other in the axial direction X-X

[0025] The slip ring sealing device 1 seals the product side 15 from the atmosphere side 16

[0026] As can be seen from Figure 1 the slip ring sealing device 1 is deeply inserted into the interior of the housing 11 of the machine. As a result, a short-axis design of the whole machine can be achieved

[0027] The slip ring sealing device 1 further includes a bushing 4 fixed to the shaft 10. As can be seen from Figure 1 the bushing 4 is fixed to the shaft 10 using screws 42. The screws 42 are screwed onto the shaft in the radial direction R

[0028] Conventionally, the driving member of the slip ring sealing device is also fixed to the bushing 4 using screws screwed onto the shaft in the radial direction. This is prevented by positioning the slip ring sealing device 1 deep inside the housing 11. In addition, the release of such radially screwed-in screws will also be avoided. Therefore, according to the present invention, a connecting device 6 is provided, and the connecting device 6 connects the driving members 5, 5' to the bushing 4 and can be actuated in the axial direction X-X

[0029] As can be seen from Figure 1 the first slip ring seal 2 has a first driving member 5, and the first driving member 5 is connected to the bushing 4 and transmits torque from the bushing 4 to the first rotating slip ring 21 of the first slip ring seal 2. The driving member 5 includes a recess 50, and the connecting device 6 is mounted on the driving member in the recess 50

[0030] Here, a circumferential thickening 41 is provided on the bushing 4. The connecting device 6 includes a rotary lock 60 shown in detail in Figure 4 and a groove 40 provided in the bushing 4

[0031] In addition, in particular as can be seen from Figure 3 it can be seen that a retaining ring 12 and an O-ring 13 are arranged on the thickened portion 41. As can be seen from Figure 3 it can be seen that the O-ring 13 is thus arranged axially between the retaining ring 12 and the groove 40. The retaining ring 12 thus prevents the axial movement of the drive member 5 in the direction towards the second slip ring seal 3.

[0032] Figure 4 The rotary lock 60 is shown in detail in. In addition to the cylindrical support portion 61 and the locking portion 62 that laterally projects from the cylindrical support portion 61, the rotary lock 60 further includes a tool attachment portion 63 at the locking portion 62. In this embodiment, the tool attachment portion 63 is a slot for receiving a screwdriver or the like. The free end 64 of the locking portion 62 that projects from the support portion 61 is arcuate. The radius of the arcuate end 64 corresponds to the radius of the bottom of the groove 40 in the bush 4. As Figure 4 shown, the rotary lock 60 can pivot about a pivot axis Y - Y, and the pivot axis Y - Y is parallel to the central axis in the axial direction X - X of the slip ring seal device 1.

[0033] As can be seen from Figure 5 and Figure 6 it can be seen that four connecting devices 6 are arranged along the circumferential direction, and each connecting device has a rotary lock 60. The connecting devices 6 are thus arranged at equal intervals along the circumferential direction.

[0034] In order to fix the locking position of the rotary lock 60, the slip ring seal device 1 further includes a fixing device 7 in the form of a screw. As can be seen from Figure 6 it can be seen that the fixing device 7 is positioned circumferentially adjacent to the rotary lock 60. As can be seen from Figure 6 it can be seen that in this connection, the fixing devices 7 are each arranged on the other circumferential adjacent side of the rotary lock 60 to be circumferentially adjacent to the rotary lock 60, as can be seen from Figure 6 it can be seen. This enables the connecting device 6 to be fixed between the drive member 5 and the bush 4 in two rotational directions.

[0035] On the second slip ring seal 3, there is provided an identical connecting device 6' having a drive member 5', a recess 50', and a rotary lock 60'.

[0036] The improved connecting devices 6, 6' between the drive members 5, 5' and the bush 4 thus allow the drive member to be axially assembled in the Figure 1 direction of arrow B. Here, first, the bush 4 is fixed to the shaft 10 using a screw 42. Then, the drive member 5' of the second slip ring seal 3 is axially pushed (arrow B) onto the bush 4 and fixed in the Figure 1 position shown. For this purpose, the rotary lock 60' is axially inserted into the recess 50' of the drive member 5' and is in the Figure 5the position shown, i.e., the locking part 62 extends substantially circumferentially. The corresponding tool attachment part 63 of the rotary lock 60' designed as a slot is aligned radially (see Figure 5 ). To fix the drive member 5' to the sleeve 4, a long rod-shaped tool is now used to axially attach the tool along X-X to the tool shoulder 63 of each rotary lock 60, as shown by the arrow A in Figure 5 . The rotary lock 60 pivots 90°. This brings the locking part 62 into contact with the groove 40 in the sleeve 4, thereby establishing a torque transmission connection between the sleeve 4 and the drive member 5'. Then the rotary slip ring 31 and the stationary slip ring 32 are slid onto the sleeve 4 into the position shown in Figure 1 . Thereafter, the drive member 5 in the direction of the first sealing ring is mounted on the sleeve 4 in the same manner, so that the rotary lock 60 is first inserted into the recess 50 of the drive member 5, in the position shown in Figure 5 , and then rotated in the direction of the arrow A.

[0037] To fix the rotational position of the rotary lock, after the rotary lock 60 has been rotated, another screw is also screwed into the drive member 5' as a fixing device 7 adjacent to each rotary lock 60. This prevents the rotary lock 60 from rotating back.

[0038] Figure 1 And Figure 2 The comparison with again illustrates the ingenious torque connection between the drive member 5 and the sleeve 4 according to the present invention. Figure 2 Shows the rotary lock 60 in a non-rotating state, where the arcuate end is not disposed in the groove 40 of the sleeve 4. Figure 1 The illustration showing the pivoted position of the rotary lock 60, i.e., the locking position, shows that the rotary lock 60 has pivoted 90°, such that the locking part 62 of the rotary lock 60 engages with the groove 40 in the sleeve 4. This allows torque to be transmitted from the sleeve 4 to the drive member 5 or 5' via the rotary lock 60 located in the groove 40.

[0039] To not overly weaken the sleeve 4 through the groove 40, a thickening part 41 is provided, and the thickening part 41 is disposed radially inside the drive member 5 or 5'. The groove 40 of the sleeve 4 can be manufactured, for example, using a milling cutter, etc. This results in an arcuate bottom in the groove 40. The radius of the arcuate bottom of the groove 40 preferably corresponds to the radius of the arcuate end 64 of the rotary lock 60.

[0040] Thus, a simple and inexpensive connection device 6, 6' can be achieved between the drive members 5, 5' and the sleeve 4. The rotary locks 60, 60' can thereby be provided as inexpensively producible components, especially castings. The assembly of the rotary lock can be easily achieved by a simple 90° rotation operation. The position of the rotary lock is additionally fixed by the fixing device 7.

[0041] List of reference numerals

[0042] 1 Slip ring sealing device

[0043] 2 First slip ring seal

[0044] 3 Second slip ring seal

[0045] 4 Bush

[0046] 5, 5' Driving part

[0047] 6, 6' Connecting device

[0048] 7 Fixing device

[0049] 10 Shaft

[0050] 11 Housing

[0051] 12 Retaining ring

[0052] 13 O-ring

[0053] 15 Product side

[0054] 16 Atmosphere side

[0055] 21 Rotating slip ring[[ID=4"]]

[0056] 22 Stationary slip ring

[0057] 23 Sealing gap

[0058] 31 Rotating slip ring[[ID=4"]]

[0059] 32 Stationary slip ring

[0060] 33 Sealing gap

[0061] 40 Groove

[0062] 41 Thickened part of the bush

[0063] 42 Screw

[0064] 50, 50 Concave part in the driving part;

[0065] 60, 60' Rotating lock

[0066] 61 Supporting part

[0067] 62 Locking part

[0068] 63 Tool attachment part / slot

[0069] 64 Arc end of the locking part

[0070] A Rotation direction of the rotating lock

[0071] B Axial installation direction

[0072] R Radial

[0073] Central axis of the X-X slip ring seal device

[0074] Y-Y axis of rotation

Claims

1. A slip ring sealing device, comprising: - A first slip ring seal (2), which includes a rotating slip ring (21) and a stationary slip ring (22), and a sealing gap (23) is defined between the rotating slip ring (21) and the stationary slip ring (22), - A bushing (4), - A driving member (5), the driving member (5) connects the bushing (4) to the rotating slip ring (21) and the driving member (5) is configured to transmit the rotation of the bushing (4) to the rotating slip ring (21), - A connecting device (6) for connecting the bushing (4) to the driving member (5), - wherein the connecting device (6) includes at least two rotating locks (60) and at least two grooves (40) in the bushing (4), - wherein each of the rotating locks (60) has a supporting portion (61) and a locking portion (62), the locking portion (62) protrudes laterally from the supporting portion (61), and each locking portion (62) is adapted to engage with a corresponding groove (40), and - wherein the rotation axis (Y-Y) of each rotating lock (60) is parallel to the central axis (X-X) of the bushing (4).

2. The slip ring sealing device according to claim 1, wherein, Each rotating lock (60) includes a tool receiving portion (63).

3. The slip ring sealing device according to claim 1 or 2, wherein, The supporting portion (61) of the rotating lock (60) is a cylinder configured in a cylindrical recess (50) of the driving member (5).

4. The slip ring sealing device according to claim 3, wherein, The length of the locking portion (62) is at least twice the diameter of the cylindrical supporting portion (61).

5. The slip ring sealing device according to claim 1 or 2, wherein, The groove (40) in the bushing (4) has an arcuate bottom in the bushing (4).

6. The slip ring sealing device according to claim 1 or 2, wherein, The free end (64) of the locking portion (62) of the rotating lock (60) is arcuate.

7. The slip ring sealing device according to claim 1 or 2, wherein, The first rotating lock (60) can rotate to lock in a first rotation direction, and the second rotating lock (60) can rotate to lock in a second rotation direction, and the second rotation direction is opposite to the first rotation direction.

8. The slip ring sealing device according to claim 1 or 2, wherein, The connecting device (6) further includes a fixing device (7) for fixing the locking position of the rotating lock (60) in the groove (40) of the bushing (4).

9. The slip ring sealing device according to claim 8, wherein, The first fixing device (7) is arranged on the first circumferentially directed side of the first rotating lock, and the second fixing device (7) is arranged on the second circumferentially directed side of the second rotating lock, and the second circumferentially directed side is opposite to the first circumferentially directed side.

10. The slip ring sealing device according to claim 8, wherein, The fixing device (7) is a fixing screw.

11. The slip ring sealing device according to claim 1 or 2, further comprising a second slip ring seal (3) and a driving member (5'), the second slip ring seal (3) has a rotating slip ring (31) and a stationary slip ring (32), and a sealing gap (33) is defined between the rotating slip ring (31) and the stationary slip ring (32), and the driving member (5') connects the rotating slip ring (31) to the bushing (4) using a connecting device (6').

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