Slip ring seal with sensor device

Abstract

The invention relates to a slip ring sealing arrangement comprising: a sealing device having a rotating slip ring (3; 13) and a stationary slip ring (4; 14), and a slip ring seal (2; 12), which delimit between their sliding surfaces a sealing gap (5; 15); the invention relates to a pre-assembled assembly having a first sensor (6) and a first cable arrangement (60) and a second sensor (7) with a second cable arrangement (70), the first cable arrangement (60) and the second cable arrangement (70) being converged to form a common cable harness (9), and the free end of the common cable harness (9) having a multi-pole combination plug (10) with a plurality of connections.

Description

Technical Field

[0001] The invention relates to a mechanical slide seal having a sensor arrangement which can be assembled easily and allows improved protection of the sensitive sensor. Background Art

[0002] Various designs of slide ring seals are known from the prior art. Recently, sensors are increasingly used to obtain information about the state of the components of the slide ring seal when the slide ring seal is in operation. However, the use of sensors makes the assembly of the slide ring seal significantly more complicated, because in addition to the common components, sensors and cables, etc. must also be assembled together. Damage often occurs at the cables and / or sensors. The sealing isolation of cables and sensor components is also associated with additional costs and is generally difficult. The use of sensors in the case of sealing isolation of explosive media is even more problematic. In this regard, given the additional explosion protection requirements for electrical connections and cables, as well as the need for additional protection against dirt and / or moisture, dirt and / or moisture may further make it prone to failure when using sensors. Summary of the invention

[0003] It is therefore an object of the present invention to provide a slide ring seal with a sensor which enables simplified assembly with a simple structure and in particular also provides improved protection for cables and electrical connections of the sensor, etc.

[0004] This object is achieved by a sliding ring seal device having the characteristics of the following technical solutions. The following technical solutions show a preferred improvement of the present invention.

[0005] The slide ring seal device according to the present invention having the following technical solution features has the following advantage, namely, the sensor and the associated cable device can be assembled significantly more simply and more quickly. It is possible here that the sensor together with the cable device can be pre-assembled into the corresponding components when the slide ring seal is manufactured, so that the sensor does not need to be assembled separately during the final assembly at the customer. As a result, the risk of damaging the sensor and its components during assembly at the customer is significantly reduced or completely eliminated. The slide ring seal device can also be used in explosion protection areas. In addition, the solution according to the present invention is very compact and small in size, which is particularly advantageous for the slide ring seal device because there is usually only limited installation space available at the location where the slide ring seal device is arranged.

[0006] This is achieved according to the invention in the following manner, that is, the slip ring seal device comprises a slip ring seal having a rotating slip ring and a stationary slip ring, and the rotating slip ring and the stationary slip ring define a sealing gap between their sliding surfaces. In addition, the slip ring seal device comprises a preassembled component, which has a first sensor with a first cable device and a second sensor with a second cable device. The first cable device and the second cable device converge into a common cable harness. A common multi-pole combination plug connector with multiple electrical connections or poles is arranged at the end of the cable harness. Therefore, the cable devices of each sensor converge into a cable harness and are then guided together to the multi-pole combination plug connector. It is possible that the sensor can be preassembled in the corresponding component of the slip ring seal device, such as a housing, a stationary slip ring or a slip ring carrier, and then only the multi-pole combination plug connector needs to be inserted into the plug connector receiving portion during assembly. Therefore, it is very simple and fast to assemble on site at the customer's place without the risk of damaging the sensor or cable components, etc.

[0007] Preferably, the first sensor and the second sensor each have an external thread on the housing part of the sensor, thereby making it possible to simply and quickly screw the sensors into the corresponding components and preassemble them.

[0008] The stationary slip ring or stationary component of the slip ring seal, such as a housing or a stationary slip ring carrier, further preferably has a threaded hole, into which the sensor can be screwed. Alternatively, a threaded sleeve with an internal thread is provided accordingly, which is arranged in the hole of the stationary component to establish a threaded connection with the sensor.

[0009] The slide ring seal further preferably comprises a cover with a guide for the cable harness, wherein a seal is arranged at the guide. The seal may be, for example, an O-ring through which the cable harness is guided, or alternatively a hot melt seal.

[0010] According to another preferred design of the present invention, the first sensor and the second sensor are different. That is, the present invention can be implemented with various sensors for different physical values, and the corresponding cable devices of these sensors can be gathered into a cable bundle and led out from the slide ring seal device together.

[0011] The sensor is selected from the group consisting of a temperature sensor, a pressure sensor, a vibration sensor, a rotation speed sensor, an optical sensor, a leakage sensor, and the like.

[0012] According to another preferred design of the present invention, the first sensor and / or the second sensor is arranged in a blind hole in the stationary slip ring. The sensor is guided through a hole in the stationary component, preferably in the housing. A sealing element is arranged between the sensor and the hole in the stationary component, through which the sensor is guided. The sealing element is pre-tightened here by means of bolts or the like, and performs a sealing isolation at the stationary component and the sensor. The hole in the stationary component may preferably include a step here, at which the sealing element performs a sealing isolation. The sealing element is preferably an O-ring here, through which the sensor is guided. As a result, the O-ring performs a sealing isolation at the outer periphery of the sensor and at the inner periphery of the hole in the stationary component.

[0013] Further preferably, the bolt comprises an axial through hole through which the sensor and / or the cable arrangement is guided. Thus, the sensor and / or the cable arrangement is guided through the bolt and the sealing element, and the bolt provides a sealing isolation at the stationary component while also providing a fastening of the sensor and / or the cable arrangement at the stationary component.

[0014] The slide ring seal arrangement is preferably a series arrangement having a first slide ring seal and a second slide ring seal, wherein at least one sensor is arranged on each slide ring seal.

[0015] Further preferably, a recess is configured in the stationary component, preferably at the outer circumference of the stationary component, into which all cable devices of the sensor are led. Then, the cable devices are gathered into a cable bundle in the recess, and the cable bundle is led out from the recess and the sliding ring seal.

[0016] The recess is preferably covered by means of a cover. A guide for the cable harness is further preferably configured between the cover and the outer circumference of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention will be 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 with a sensor according to a first embodiment of the present invention is shown,

[0019] Figure 2 Shows Figure 1 A schematic perspective view of a partial area of ​​a mechanical slide ring seal, where the cable harness converges, and

[0020] Figure 3 A schematic perspective view of a slide ring seal according to a second embodiment of the present invention is shown. DETAILED DESCRIPTION

[0021] The following reference Figure 1 and Figure 2A slide ring seal device 1 according to a first embodiment of the present invention will be described in detail.

[0022] As from Figure 1 As can be seen in the figure, the slide ring seal device 1 of the first embodiment is a so-called tandem slide ring seal (Tandem-Gleitringdichtung), which includes a first slide ring seal 2 and a second slide ring seal 12 connected in series in the axial direction XX. The first slide ring seal 2 and the second slide ring seal 12 seal and isolate the product chamber 24 from the atmosphere 25 at the shaft 26.

[0023] The mechanical seal 1 is a preassembled unit which is preassembled on the sleeve 27 .

[0024] The first slide ring seal 2 includes a rotating slide ring 3 and a stationary slide ring 4 , wherein the rotating slide ring 3 and the stationary slide ring 4 define a sealing gap 5 between their sliding surfaces.

[0025] The second slide ring seal 12 includes a rotating slide ring 13 and a stationary slide ring 14 , wherein the rotating slide ring 13 and the stationary slide ring 14 define a sealing gap 15 between their sliding surfaces.

[0026] The mechanical slide seal 1 further comprises a stationary component 17 in the form of a housing.

[0027] Furthermore, the slide ring seal device 1 includes three sensors, namely a first sensor 6 , a second sensor 7 and a third sensor 8 .

[0028] The first sensor 6 is a temperature sensor, which is arranged in a blind hole 4a in the stationary slide ring 4 of the first slide ring seal 2. The second sensor 7 is also a temperature sensor, which is arranged in a blind hole 14a in the stationary slide ring 14 of the second slide ring seal 12. The third sensor 8 is a pressure sensor arranged in the stationary component 17. The pressure sensor is connected to the product chamber 24 via a gap and measures the product pressure in the product chamber 24.

[0029] The first sensor 6 and the second sensor 7 , both of which are designed as temperature sensors, measure the current temperature at the stationary slide ring 4 , 14 in each case in order to draw conclusions about the serviceability of the first slide ring seal 2 and the second slide ring seal 12 .

[0030] The first sensor 6 comprises a first cable device 60 led out of the stationary component 17. The second sensor 7 comprises a second cable device 70 also led out of the stationary component 17. The third sensor 8 comprises a third cable device 80 also led out of the stationary component 17. The three cable devices 60, 70, 80 are then gathered into a common cable harness 9. The common cable harness 9 comprises a multi-pole combined connector 10 having a plurality of contact portions at the end away from the sensors.

[0031] In order to process the values ​​recorded by the sensors 6 , 7 , 8 , the modular plug connector 10 has only to be inserted into the plug connector receptacle 22 , which is connected to the evaluation unit 23 or control unit.

[0032] The three cable devices 60, 70, 80 converge into a common cable harness 9 at a recess 21 at the stationary component 17, and the recess is covered by a cover 11. In order to lead the common cable harness 9 out of the recess 21, a guide 11a is provided between the stationary component 17 and the cover 11. A seal 16, such as an O-ring, is provided at the guide 11a, and the cable harness 9 is guided through the seal.

[0033] As from Figure 1 As can be seen in FIG. 1 , the first sensor 6 comprises a housing part 62, where an external thread 61 is provided. Therefore, the first sensor 6 can be screwed into a threaded hole in the stationary component 17 and securely fastened. The second sensor 7 has a housing part 72, where an external thread 71 is provided.

[0034] In order to prevent the individual cables of the cable devices 60 , 70 , 80 from being damaged, a protective sleeve 63 is provided at the first cable device 60 , and a protective sleeve 73 is provided at the second cable device 70 .

[0035] As from Figure 2 As can be seen in detail in FIG, the cable devices 60, 70, 80 are led out of the stationary component 17 and into the recess 21. The recess 21 is arranged at the periphery of the stationary component and is protected by the cover 11. The cable devices 60, 70, 80 are gathered into a common cable bundle 9 within the recess 21, which is then led out of the recess 21.

[0036] Therefore, a preassembled slide ring seal 1 can be provided, in which sensors 6, 7, 8 are used, and these sensors no longer need to be assembled on site at the customer, but can be preassembled at the manufacturer of the slide ring seal. When the slide ring seal 1 is assembled at the shaft 26, the cable devices 60, 70, 80 are protected from damage by the cover 11. Therefore, the assembler only needs to insert the combined plug connector 10 into the plug connector receiving portion 22, and then the slide ring seal with the sensor can be put into use.

[0037] In the present embodiment, the first sensor 6 and the second sensor 7 are temperature sensors. The third sensor 8 is a pressure sensor. Therefore, the various sensors can be wired in a simple manner, regardless of the number of individual cables of the corresponding cable arrangement 60, 70, 80. The present invention prevents in particular the tangling of cables, which still exists in the prior art when assembling a slide ring seal with sensors. This usually leads to an incorrect electrical connection of the individual cables, which must therefore be laboriously rewired in the correct manner after the slide ring seal has been assembled.

[0038] The individual cables of the cable arrangement 60 , 70 , 80 can be effectively protected by the convergence in the recess 21 , since they no longer have to be touched when assembled on the shaft 26 to be sealed off at the customer's site.

[0039] The slide ring seal 1 is particularly suitable for use in the field of explosive substances, since the cover 11 also provides ignition protection against unwanted explosions triggered by the sensor and / or its cable arrangement. The cover 11 also provides excellent protection against dirt and moisture, which could impair the function of the sensors 6, 7, 8.

[0040] Furthermore, the cover 11 together with the seal 16 enables improved shielding against electric and / or magnetic fields which could interfere with the function of the sensors 6, 7, 8. This also advantageously reduces the susceptibility to interference during data transmission.

[0041] The screw connections of the sensors 6 , 7 , 8 in the stationary component 17 are designed to be pressure-tight, so that no leakage can occur via the holes required for the sensors 6 , 7 , 8 .

[0042] A strain relief is preferably also arranged on the seal 16 in order to prevent damage to the cable arrangement when the combination plug connector 10 is inserted into the plug connector receptacle 22 .

[0043] Figure 3 FIG. 1 shows a slide ring seal device 1 according to a second embodiment of the present invention. Identical or functionally identical components are labeled with the same reference numerals as in the first embodiment. Unlike the first embodiment, the first sensor 6 is fixed differently in the second embodiment. The second sensor is not shown. Figure 3 As can be seen in the figure, the first cable device 60 is guided through a bolt 20, which has a central through hole 20a located on its axial axis. The bolt 20 is screwed into the threaded hole 18 in the stationary component 17. A sealing element 19 is arranged between the shoulder 18a of the threaded hole and the bolt, which is pressed against the shoulder 18a by the screwing of the bolt 18. In this way, a pressure-tight sealing isolation of the sensor 6 can be achieved. The sealing element 19 is a hose-shaped sealing element, through which the sensor 6 is also guided. The sealing element 19 is compressed by the extrusion process with the help of the bolt 20, and thus a pressure-stable sealing isolation is performed at the outer periphery of the sensor 6 and the inner periphery of the hole 18. For the rest, this embodiment corresponds to the previous embodiment, so that reference can be made to the description given there.

[0044] Description of Reference Numerals

[0045] 1 Slide ring seal device

[0046] 2. First sliding ring seal

[0047] 3 Rotating slip ring

[0048] 4Stationary slip ring

[0049] 4a Blind hole

[0050] 5 Sealing gap

[0051] 6First Sensor

[0052] 7 Second sensor

[0053] 8Third sensor

[0054] 9 Common cable harness

[0055] 10Combination connectors

[0056] 11 Cover

[0057] 11a Guide

[0058] 12 Second sliding ring seal

[0059] 13 Rotating slip ring

[0060] 14 Stationary slip ring

[0061] 14a Blind hole

[0062] 15 Sealing gap

[0063] 16 Seals

[0064] 17Stationary components / housing

[0065] 18 threaded holes

[0066] 18a Shoulder

[0067] 19 Sealing element

[0068] 20 Bolts

[0069] 20a Through hole

[0070] 21 recess

[0071] 22 Connector receiving portion

[0072] 23 evaluation units

[0073] 24 Product Room

[0074] 25 Atmosphere

[0075] 26 Axis

[0076] 27 Shaft sleeve

[0077] 60 First Cable Device

[0078] 61 External thread

[0079] 62 Housing part of first sensor

[0080] 63 Protective sleeve

[0081] 70 Second cable device

[0082] 71 External thread

[0083] 72 Housing part of second sensor

[0084] 73 Protective sleeve

[0085] 80 Third cable device

[0086] XX Axial direction

Claims

1. A sliding ring sealing device, comprising: - having a rotating slip ring (3; 13) and stationary slip ring (4; 14), wherein the rotating slip ring and the stationary slip ring define a sealing gap (5; 15) between their sliding surfaces; a preassembled assembly having a first sensor (6) and a first cable arrangement (60) and a second sensor (7) with a second cable arrangement (70), - wherein the first cable arrangement (60) and the second cable arrangement (70) are joined to form a common cable bundle (9), and - wherein the free end of the common cable harness (9) has a multi-pole combined connector (10) with a plurality of connections.

2. The slide ring seal device according to claim 1, wherein the first sensor (6) and the second sensor (7) each have an external thread (61; 71) on a housing part (62; 72) of the sensor.

3. The slide ring seal according to claim 1, wherein a stationary component (17) of the slide ring seal has a thread, into which the sensor (6) is screwed.

4. The slide ring seal device according to any one of the preceding claims, further comprising a cover (11) having a guide portion (11a) for the cable harness (9), wherein a seal (16) is arranged at the guide portion (11a).

5. The slide ring seal device according to any one of the preceding claims, wherein the first sensor (6) and the second sensor (7) are different sensors for different physical quantity values.

6. The slide ring seal device according to any one of the preceding claims, wherein the first sensor (6) and / or the second sensor (7) is selected from the group consisting of a temperature sensor, a pressure sensor, a vibration sensor, a rotation speed sensor, an optical sensor, and a leakage sensor.

7. A sliding ring sealing device according to any of the preceding claims, wherein the first sensor (6) and / or the second sensor (7) is arranged in a blind hole (4a; 14a) in the stationary sliding ring (4; 14) and is guided through a hole (18) in a stationary component (17), wherein the hole (18) is sealed and isolated by means of a sealing element (19) and a bolt (20) pre-tightening the sealing element (19).

8. The slide ring seal device according to claim 7, wherein the bolt (20) has an axial through hole, and the sensor (6) is guided through the axial through hole.

9. The slide-ring seal arrangement according to claim 1, comprising two slide-ring seals (2, 12) which are arranged in series on a sleeve (27), wherein at least one sensor (6, 7) is arranged on each slide-ring seal.

10. The sliding ring seal device according to any of the preceding claims, wherein a recess (21) is formed in the stationary component (17), all cable arrangements (60, 70, 80) of the sensors lead into the recess, and the cable arrangements (60, 70, 80) are brought together in the recess to form the common cable harness (9).

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