Slip ring seal assembly
By introducing a protective pin into the slip ring seal assembly, the cable is guided into the fixed member, which solves the problem of cable breaking under extreme conditions, achieves the safety and stability of the cable, and supports the axial re-adjustment movement of the slip ring.
Patent Information
- Application Number
- CN202380076536.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-02-13
- Filing Date
- 2023-12-11
- Publication Date
- 2025-06-27
AI Technical Summary
In existing slip ring sealing assemblies, cable-connected units, such as sensors, are prone to breaking due to exposure to extreme conditions, resulting in loss of connection.
A slip ring seal with a rotary slip ring and a stationary slip ring is designed to guide the cable into a fixed member through a protective pin to ensure the safety and stability of the cable.
The optimal arrangement of the cable connection units in the slip ring ensures that the cable is not at risk of damage during operation and supports the axial re-regulation movement of the slip ring.
Smart Images
Figure CN120225798A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a slip ring sealing assembly having a cable-connected unit, such as a sensor, which is arranged in a slip ring and attached by means of a cable for power supply and / or information exchange. Background Art
[0002] Different designs of slip ring sealing assemblies are known from the prior art. In recent years, there have been increasing attempts to obtain information about the state of slip ring seals, especially at the sliding surfaces of slip ring seals. For this purpose, cable-connected units, such as sensors, are arranged peripherally or in recesses in the slip ring. The cables connected to the cable-connected units must in this case be led away from the slip ring and are often exposed to extreme external conditions in terms of temperature, pressure or medium. In addition, such cables must be able to compensate for the readjustment movement, especially in the axial direction, of the slip ring. In this case, the cables often break, resulting in the connection to the cable-connected unit no longer existing. Summary of the Invention
[0003] Therefore, the object of the present invention is to provide a slip ring sealing assembly having a cable-connected unit, which can achieve safe cable contact for the unit arranged in or at the slip ring in a simple structure, simple manufacturing and low cost.
[0004] This object is achieved by a slip ring sealing assembly having the features of the following design. Other designs show preferred improvements of the present invention.
[0005] In contrast, the slip ring sealing assembly according to the present invention having the features of the following design has the advantage that cable-connected units, such as sensors, etc., via cable contact can be arranged in the best positions at or in the slip ring. During operation, the cable can be safely guided to a position-fixed member, such as a housing member, without the risk of damage. According to the present invention, this is achieved in that the slip ring sealing assembly has a slip ring seal with a rotating slip ring and a stationary slip ring, which define a sealing gap between their sliding surfaces. The cable-connected unit is arranged in or at one of the slip rings. The cable connected to the cable-connected unit is configured to supply power and / or provide information to the cable-connected unit. The protective pin ensures protection of the cable. The protective pin is arranged and configured at the slip ring having the cable-connected unit and provides protection for the cable, wherein the protective pin has a recess through which the cable supplied by the slip ring is guided. Thus, the supplied cable can be safely led away from the slip ring without the risk of cable damage during the operation of the slip ring sealing assembly. Preferably, the cable is led away from the slip ring in an arc to avoid damage due to breakage.
[0006] Particularly preferably, the unit with the cable connection is arranged at the stationary slip ring. Here, the protective pin is arranged between the stationary slip ring and the stationary member (especially a housing member, etc.). Thus, the protective pin provides a connection between the stationary slip ring and the stationary member and protects the cable from the stationary slip ring up to the stationary member.
[0007] The cable supplied by the stationary slip ring is preferably directly introduced from the stationary slip ring into the recess in the protective pin. Preferably, the cable from the stationary slip ring up to the stationary member is completely arranged and protected in the recess of the protective pin.
[0008] Further preferably, the slip ring with the unit having the cable connection has a groove at its outer circumference. Here, the protective pin is arranged in the groove. Preferably, the groove extends in the axial direction, and further preferably, the groove completely penetrates the slip ring in the axial direction.
[0009] Preferably, the protective pin has a slit region, and the recess includes a slit in the slit region to ensure a particularly compact and robust structure. Here, the cable is supplied (preferably directly) by the slip ring into the slit and is thus protected by the wall surrounding the slit.
[0010] Particularly preferably, the slit is open on one side in the axial direction and is configured as a radial through-slit, so that the protective pin has a first free arm and a second free arm, and a slit is formed between the first free arm and the second free arm. Thus, the same protective pin can be used for slip ring seals of various different structural types.
[0011] The protective pin preferably has a head region which adjoins the slit region. The recess includes a through-opening in the head region, and the through-opening in the head region is arranged such that the slit in the slit region is arranged at the end of the through-opening in the head region. Thus, the slit directly transitions into the through-opening. Thereby, the cable can be easily introduced from the slit into the through-opening without the risk of damage.
[0012] Further preferably, especially by providing a preloading element whose preloading force acts on the axially movable slip ring, the slip ring with the unit having the cable connection can be axially movable. Thereby, the axially movable slip ring can also be provided with a unit having a cable connection, and in particular, the axially movable slip ring can be monitored, for example, by means of a sensor connected by a cable. Despite the axial movement of the slip ring, due to the provision of the protective pin, the cable will not be damaged. Thus, the axially movable slip ring with the unit having the cable connection can also be monitored during its entire service life, for example, by means of a sensor.
[0013] Further preferably, a plurality of cables are supplied to the stationary member by a slip ring through a common recess of a protective pin. Therefore, although there are units for connecting a plurality of cables at the slip ring, only a single, common protective pin needs to be provided to guide all the cables of the cable connection unit of the slip ring to the housing.
[0014] If the cables supplied by the slip ring are only guided in the gap of the protective pin, a particularly good protective effect of the protective pin is achieved. Thereby, particularly good shielding of the protective pin can be achieved, and in particular, it is also feasible that the protective pin is arranged in a medium to be sealed that may have high temperature and / or high pressure.
[0015] Particularly preferably, the cable connection unit is arranged in a blind hole in the slip ring, where the blind hole is arranged at an acute angle, especially about 10° to 40°, further especially about 20°, with respect to the sealing gap. Therefore, the cables of the cable connection unit are led out of the slip ring in a relatively steep manner, and there is a high risk of breakage or other damage without a protective pin. Here, the protective pin also protects the cables led out of the slip ring at an acute angle.
[0016] Further preferably, the protective pin is also configured to transfer torque from the slip ring having the cable connection unit or to transfer torque to the slip ring having the cable connection unit, and transfer it to other components. Therefore, in addition to protecting the cables, the protective pin also undertakes the function of torque transmission between the slip ring and other components.
[0017] Preferably, here, such a protective pin has a cover at the gap area of the protective pin, and torque is introduced into the protective pin through the cover.
[0018] The cables of the cable connection unit are preferably electric wires and / or signal wires.
[0019] Further preferably, the cable connection unit is a sensor arranged at or in the slip ring, and particularly preferably, the sensor is arranged in the slip ring, especially in a blind hole. Preferably, the sensor is a temperature sensor and is arranged in the slip ring, so that particularly accurate temperature acquisition of the slip ring can be achieved.
[0020] Further preferably, the protective pin is configured such that the gap area is longer than the head area of the protective pin in the axial direction. Further preferably, in the axial direction, the length of the gap area is especially more than 2 / 3 of the total length of the protective pin. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings:
[0022] Figure 1 is a schematic cross-sectional view of a slip ring sealing assembly according to a first embodiment of the present invention,
[0023] Figure 2 is Figure 1 a schematic perspective view of a protective pin of a slip ring seal assembly in
[0024] Figure 3 is Figure 2 a schematic sectional view along the longitudinal axis of the protective pin in
[0025] Figure 4 is a schematic sectional view of a slip ring seal assembly according to a second embodiment of the present invention, and
[0026] Figure 5 is Figure 4 a schematic sectional view along line V-V in Detailed Description of the Preferred Embodiment
[0027] The following refers to Figures 1 to 3 for a detailed description of the slip ring seal assembly 1 according to the first preferred embodiment of the present invention.
[0028] Here, the slip ring seal assembly 1 seals and isolates the product area 16 having the medium to be sealed from the ambient area 17 at the shaft 12.
[0029] The slip ring seal assembly 1 includes a slip ring seal 2, which has a rotating slip ring 3 and a stationary slip ring 4. A sealing gap 5 is defined in a known manner between the sliding surfaces of the slip rings 3 and 4.
[0030] The rotating slip ring 3 is connected to the shaft 12 by means of a slip ring carrier 30 and rotates therewith.
[0031] The stationary slip ring 4 is arranged at a stationary member 18, which is a housing. The stationary slip ring 4 is hereby arranged to be axially movable and is preloaded relative to the rotating slip ring 3 in the axial direction X-X by means of a preloading element 11. As can be seen from Figure 1 a cable-connected unit 7 is arranged in the stationary slip ring 4. The cable-connected unit 7 includes a sensor 70 and a cable 71. The cable 71 connects the sensor 70 to the measuring unit 10.
[0032] In this embodiment, the sensor 70 is a temperature sensor which is set to measure the temperature of the stationary slip ring during operation. The cable 71 is hereby set to transmit electrical energy as well as information, in particular measured values, between the sensor 70 and the measuring unit 10.
[0033] The sensor 70 is arranged in a blind hole 41 at an acute angle a with respect to the sealing gap 5. The cable 70 is hereby led out from the radially outward-facing side of the stationary slip ring at this acute angle a.
[0034] The slip ring seal assembly 1 further includes a protective pin 6, details of which can be found in Figure 2 and Figure 3. The protection pin 6 has a slit region 60 and a head region 63. In particular, as can be seen from Figure 1 , the slit region 60 is arranged in the groove 40 of the stationary slip ring 4. The groove 40 is a through groove extending in the axial direction X-X at the outer periphery of the stationary slip ring 4. The width of the groove 40 is selected such that the slit region 60 can be arranged in the groove 40 without problems (see Figure 1 ).
[0035] The head region 63 has a diameter slightly larger than that of the slit region 60. The head region 63 is arranged and fixed in the stationary member 18, for example, by an interference fit.
[0036] The slit region 60 has a first arm 61, a second arm 62, and a recess 8. Here, the recess 8 includes a slit 80 formed between the first arm 61 and the second arm 62 and a through opening 81 provided in the head region 63.
[0037] The slit 80 is formed as a slit that completely penetrates in the radial direction between the arms 61, 62. Here, the slit extends from the head region 63 to the free end of the slit region 60 and is open at the free end (see Figure 2 ). Thus, the two arms 61, 62 extend parallel to each other and are fixed only at the head region 63, and moreover, they are not connected to each other in any case.
[0038] As can be seen from Figure 1 , the cable 71 is led out from the stationary slip ring 4 in the region of the groove 40 and is directly introduced into the recess 8, more precisely, into the slit 80. Then, the cable 71 is led out of the slit 80 in an arc shape first radially outward, and then is introduced into the slit 80 again in front of the through opening 81. The cable 71 is then guided through the through opening 81 into the housing and is led from there to the measuring unit 10.
[0039] In addition, a seal 9 is also arranged in the housing 10 to seal and isolate the cable guided through the through opening 81 from the product region 16.
[0040] As can be seen from Figure 1 , in this case, the cable 71 is thus first led through the product region 16 from the stationary slip ring 4 and then until it is introduced into the stationary member 18. Thereby, the cable is exposed to the medium to be sealed, especially under possible high-temperature and high-pressure conditions. In addition, the stationary slip ring 4 of the unit 7 with the cable connection is arranged in an axially movable manner. Here, especially because the cable 71 is led out from the stationary slip ring 4 in an arc shape, the cable 71 can move axially without problems and especially without damage.
[0041] Thus, the cable 71 of the cable-connected unit 7 is particularly protected by the protective pin 6 and is safely guided to the stationary member 18, and then guided through the stationary member to the measuring unit 10. Thus, an optimal arrangement of the cable-connected unit 7 in the slip ring can be achieved, wherein in particular the cable 71 can also be led out of the slip ring at the radially outer side of the slip ring. Thereby, the cable can be led out in the form of a gentle arc, so that the axial readjustment movement of the slip ring can also be carried out without damaging the cable.
[0042] Figure 4 and Figure 5 Fig. shows a slip ring seal assembly 1 according to a second embodiment of the present invention. Identical or functionally identical components are labeled in the same way as in the first embodiment.
[0043] The second embodiment basically corresponds to the first embodiment, wherein the second embodiment differs from the first embodiment in that the cable 71 of the cable-connected unit 7 is led out of the stationary slip ring 4 in such a way that the cable 71 is completely arranged in the groove 80 between the two arms 61, 62. Thereby, the cable 71 is guided in a straight line into the through opening 81 in the head region 63 of the protective pin 6. As Figure 5 shown, here, the cable 71 is completely guided between the two arms 61, 62 in the gap region 60. In order to enable the stationary slip ring 4 (which is preloaded relative to the rotating slip ring 3 by the preloading element 11) to perform a large axial movement, for example, the cable 71 can be guided in a wavy manner in the gap region 60 without protruding radially outwards or radially inwards beyond the arms 61, 62. Thus, the cable 7 is particularly well protected from external influences, especially from the product area 16, and still an axial movement can be carried out.
[0044] The protective pin 6 of the second embodiment additionally also has a torque transmission function. Here, the torque is transmitted from the stationary slip ring 4 via the protective pin 6 to the stationary member 18 during operation, and the protective pin is configured as an additional torque transmission element. In this case, the protective pin 6 additionally also has a cover 13, which is in direct contact with the wall of the groove 40 at the radially outer periphery of the stationary slip ring 4. Thus, the protective pin has a torque transmission function in addition to the function of protecting the cable 71. The second embodiment corresponds to the first embodiment in other respects, so reference may be made to the description of the first embodiment.
[0045] Explanation of reference numerals
[0046] 1 Slip ring seal assembly
[0047] 2 Slip ring seal
[0048] 3 Rotating slip ring
[0049] 4 Stationary slip ring
[0050] 5 Sealing gap
[0051] 6 Protection pin
[0052] 7 Cable-connected unit
[0053] 8 Concave portion
[0054] 9 Sealing element
[0055] 10 Measuring unit
[0056] 11 Preloading element
[0057] 12 Shaft
[0058] 13 Cover
[0059] 16 Product area
[0060] 17 Environment area
[0061] 18 Stationary component / housing
[0062] 30 Slip ring carrier
[0063] 40 Groove
[0064] 41 Blind hole
[0065] 60 Gap area
[0066] 61 First arm
[0067] 62 Second arm
[0068] 63 Head area
[0069] 70 Sensor
[0070] 71 Cable
[0071] 80 Gap
[0072] 81 Through-opening
[0073] a Acute angle
[0074] X-X axial direction
Claims
1. A slip ring sealing assembly, comprising: - A slip ring seal (2), including a rotating slip ring (3) having a first sliding surface and a stationary slip ring (4) having a second sliding surface, which defines a sealing gap (5) between the sliding surfaces; - A cable-connected unit (7), which is arranged at one of the slip rings; - Wherein the cable-connected unit (7) has a cable (71), and the cable is configured to supply electrical energy and / or to transmit information; and - A protective pin (6), which is arranged at the slip ring having the cable-connected unit and is configured to provide protection to the cable (71); - Wherein the protective pin (6) has a recess (8), and the cable (71) supplied by the slip ring provided with the cable-connected unit is guided through the recess (8).
2. The slip ring sealing assembly according to claim 1, wherein the cable-connected unit (7) is arranged at the stationary slip ring (4), and the protective pin (6) is arranged between the stationary slip ring (4) and a stationary member (18).
3. The slip ring sealing assembly according to any one of the preceding claims, wherein the cable (71) is supplied by the slip ring having the cable-connected unit (7) and is directly introduced into the recess (8) in the protective pin (6).
4. The slip ring sealing assembly according to any one of the preceding claims, wherein the slip ring having the cable-connected unit has a groove (40) at the outer circumference, and the protective pin (6) is arranged in the groove.
5. The slip ring sealing assembly according to any one of the preceding claims, wherein the protective pin (6) includes a slit region (60) and a head region (63), and the recess (8) includes a slit (80) in the slit region (60).
6. The slip ring sealing assembly according to claim 5, wherein the slit (80) is unidirectionally open in the axial direction (X-X) and is configured as a radial through-slit, such that the slit region (60) has a first arm (61) and a second arm (62), and the slit (80) is configured between the first arm and the second arm.
7. The slip ring sealing assembly according to claim 5 or 6, wherein the recess has a through-opening (81) in the head region (63) of the protective pin (6), such that the slit (80) directly transitions into the through-opening (81), and the cable (71) is guided through the through-opening (81).
8. The slip ring sealing assembly according to any one of the preceding claims, wherein the protective pin (6) is fixed in the stationary member (18).
9. The slip ring sealing assembly according to any one of the preceding claims, wherein the slip ring having the cable-connected unit (7) is pre-tightened in the axial direction (X-X) by a pre-tightening element (11) and is arranged to be movable in the axial direction.
10. The slip ring sealing assembly according to any one of the preceding claims, wherein the unit (7) to which the cable is connected includes a sensor (70) arranged at or in the slip ring.
11. The slip ring sealing assembly according to any one of claims 5 to 10, wherein the cable (71) is guided from the slip ring having the unit (7) to which the cable is connected only in the gap (80) of the protection pin (6) up to the stationary member (18).
12. The slip ring sealing assembly according to any one of the preceding claims, wherein the cable (71) is led out from the slip ring having the unit (7) to which the cable is connected at an acute angle to the sealing gap (5) on the radially outer side of the slip ring.
13. The slip ring sealing assembly according to any one of the preceding claims, wherein the protection pin (6) is further configured to transfer torque from the slip ring having the unit (7) to which the cable is connected or to transfer torque to the slip ring having the unit (7) to which the cable is connected.