Modular sealing system and electric motor having such modular sealing system

Abstract

A modular sealing system for an electric motor for a gearless mill includes a movable seal carrier. By moving the seal carrier rearward in a direction opposite the rotor cover, maintenance activities such as replacement of the sealing elements can be performed, with the modular sealing system still in an installed state. In some examples, the seal carrier can also be secured to the rotor cover. As a result, other components that require disassembly of the stator cover can be maintained without unloading the modular sealing system.

Description

Technical Field

[0001] The present disclosure relates to a modular sealing system for sealing between a stator and a rotor of an electric motor, and an electric motor having such a sealing system for sealing between a stator and a rotor. Further, the present disclosure relates to a gearless mill having such an electric motor and a method for replacing a sealing element of a sealing system in an installed state. In particular, the present disclosure relates to a sealing device for sealing between a stator and a rotor of an electric motor for a gearless mill and the use of a sealing component, which is at least partially embodied in a substantially T-shape, for sealing between a stator and a rotor of an electric motor for a gearless mill. Background Art

[0002] The electric motor can be used to drive the mill by mounting a direct drive ring motor around the outer housing of the mill body. For example, this embodiment of the motor does not require gears between the drive and the mill, thereby saving efficiency losses caused by gears. The size of the electric motor for a gearless mill can be adapted to surround the mill body. Therefore, the final assembly is usually performed on site, that is, sub-assemblies and individual components can be shipped to the site to facilitate logistics. However, assembling the motor on site may cause unexpected problems, which may generate additional costs and is very time consuming.

[0003] Gearless mill drives may be used in mining to grind large pieces of ore into smaller pieces. Therefore, the motor used for the gearless mill and all its components may be exposed to extreme conditions (e.g., vibration, high temperature, and dusty environment).

[0004] For example and among other things, a sealing system may also be required to protect components of the electric motor. In particular, a sealing system may be required on each side of the electric motor between the stator and the rotor in order to protect the internal components, for example from a dusty environment. The sealing system may include at least one sealing element connected to the stator and pressed against the rotor.

[0005] Due to the extreme conditions that the motor components, in particular the sealing system, may have to withstand, maintenance may be required during the life of the motor. Further, the demands on the sealing system may be very high.

[0006] For example, when performing maintenance on the sealing system, the entire sealing system and stator assembly must be removed and placed on the ground to replace the consumable sealing elements. With the size of such motors and the boundary conditions for maintaining the sealing system in the field, maintenance can become very time consuming. Summary of the invention

[0007] Various aspects and advantages of the present disclosure will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the present disclosure.

[0008] The present disclosure provides a modular sealing system, an electric motor, a gearless mill, and a method for replacing sealing elements of a sealing system of an electric motor to simplify maintenance of the electric motor and reduce the number of unexpected problems when the electric motor is finally assembled on site. In particular, the present disclosure provides a sealing device and a use of a sealing component, which is at least partially embodied in a generally T-shape, for sealing between a stator and a rotor of an electric motor for a gearless mill to simplify maintenance and replacement of the sealing element.

[0009] In one aspect, the present disclosure provides a modular sealing system for sealing between a stator cover and a rotor cover of an electric motor for a gearless mill. It includes a seal carrier for carrying at least one sealing element to seal the rotor cover. The seal carrier can be connected to the stator cover so as to be movable in a direction toward the stator cover. The modular sealing system also includes at least one operating state and a first maintenance state. In the first maintenance state, the distance between the rotor cover and the seal carrier is greater than the distance in the operating state.

[0010] In another aspect, the present disclosure provides an electric motor comprising a rotor cover, a stator cover and a modular sealing system as disclosed herein.

[0011] In another aspect, the present disclosure provides a gearless mill comprising a mill body according to the present disclosure and a motor.

[0012] In another aspect, the present disclosure provides a method for replacing a sealing element of a sealing system for an electric motor of a gearless mill. The method is performed in an installed state of the sealing system and includes the following steps: moving a seal carrier from an initial position in a direction opposite to a rotor cover. Subsequently, replacing the sealing element and moving the seal carrier back to the initial position.

[0013] In yet another aspect, the present disclosure provides a sealing device for sealing between a stator cover and a rotor cover of an electric motor for a gearless mill. It includes a seal holder and a sealing component. The seal holder is divided into at least two circular segments and also includes a substantially T-shaped slot. The sealing component is at least partially embodied as a substantially T-shape, so that the sealing component is fixed in the slot of the seal carrier in a positive locking manner by the substantially T-shape.

[0014] In another aspect, the present disclosure provides a use of a sealing component, at least partially embodied in a generally T-shape, for sealing between a stator and a rotor of an electric motor for a gearless mill. The sealing component is fixed between the stator and the rotor in a positive locking manner by the generally T-shape.

[0015] The details of one or more aspects of the present disclosure are set forth in the accompanying drawings and the description below. Other features, objectives, and advantages of the techniques described in the present disclosure will become apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification sets forth a full and enabling disclosure of the present disclosure, which specification refers to the accompanying drawings, wherein

[0017] Figure 1 is an exploded perspective cross-sectional view of a motor according to an embodiment of the present disclosure.

[0018] Figure 2 is a perspective cross-sectional view of a gearless mill according to an embodiment of the present disclosure.

[0019] Figure 3 is a perspective cross-sectional view of a modular sealing system in an operating state according to an embodiment of the present disclosure.

[0020] Figure 4 is a cross-sectional view of a modular sealing system in a first maintenance state according to an embodiment of the present disclosure.

[0021] Figure 5 is a perspective cross-sectional view of a modular sealing system in a second maintenance state according to an embodiment of the present disclosure.

[0022] Figure 6 is a perspective view of a segmented modular sealing system according to an embodiment of the present disclosure.

[0023] Figure 7 is a perspective cross-sectional view of a seal holder of a sealing device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] The technology disclosed herein generally relates to a sealing system for an electric motor of a gearless mill, which sealing system is maintainable in an advantageous manner in the prior art by providing a modular sealing system. An apparatus operating in accordance with the technology disclosed herein enables the sealing system to be maintained in an installed state by setting it in a first maintenance state, i.e., the sealing system is arranged between the stator cover and the rotor cover. It is not necessary to remove the modular sealing system and the stator cover according to the present disclosure and place them on the ground in order to perform maintenance activities on the modular sealing system in the field. In some examples, the modular sealing system can also be set to a second maintenance state, in which other components are maintainable without removing the modular sealing system from the motor. In particular, the technology disclosed herein relates to a sealing system for an electric motor of a gearless mill, which sealing system can be maintainable in an advantageous manner in the prior art by providing a forced locking sealing component in which several fixing elements are omitted.

[0025] The modular sealing system according to the present disclosure seals a sealing gap between a stator cover and a rotor cover of an electric motor. As the design options may vary, the sealing gap may be oriented axially, radially or obliquely to the rotation axis of the electric motor.

[0026] As used herein, the terms "stator cover" and "rotor cover" refer to components that can define a gap to be sealed between a stator and a rotor. The modular sealing system can be arranged between the stator cover and the rotor cover. According to various embodiments, the stator cover and the rotor cover can be components that literally cover the stator component or the rotor component. In these embodiments, the gap to be sealed can be located between the stator cover and the rotor cover. The stator cover and / or the rotor cover can include several parts.

[0027] According to various embodiments, the modular sealing system may include a seal carrier. The seal carrier may provide a connection with the stator cover so as to be movable in a direction toward the stator cover. Further, the seal carrier may provide a fixation for the sealing element to seal the rotor cover.

[0028] Since the modular sealing system according to the present disclosure relates to an electric motor for a gearless mill that may include a diameter of at least five meters, the components of the modular sealing system may have substantially the same size. In particular, the electric motor for a gearless mill includes a diameter of at least ten meters. In particular, the electric motor for a gearless mill may include a diameter of at least 15 meters.

[0029] According to some embodiments, the modular sealing system can be divided into circular segments to minimize the size of individual components of the modular sealing system, thereby facilitating logistics. In particular, the modular sealing system can be divided into at least four circular segments. According to various embodiments, the modular sealing system can be divided into at least eight circular segments. In particular, the modular sealing system can be divided into at least 16 circular segments. In some particularly preferred embodiments of the present disclosure, the modular sealing system can be divided into at least 32 circular segments. The size of a circular segment can be the same as the size of another circular segment, or it can also be different.

[0030] According to various embodiments, the modular sealing system may include a retaining carrier for providing a connection to the stator cover. The seal carrier may be connected to the retaining carrier so as to be movable in a direction toward each other. For example, the seal carrier may be connected to the stator cover and / or the retaining carrier. Since the retaining carrier may be pre-assembled to the seal carrier, the retaining carrier may simplify assembly of the electric motor on site.

[0031] As used herein, the term "retaining carrier" refers to a component of a modular sealing system that can hold a seal carrier. The retaining carrier can be mounted to a stator component of an electric motor. The term "seal carrier" refers to a component of a modular sealing system that can carry at least one sealing element. The seal carrier can be mounted to the retaining carrier and / or the stator cover.

[0032] According to various embodiments, the seal carrier may also be connected to the rotor cover. The seal carrier may be connected to the rotor cover by at least one first connection device. The modular sealing system may be set to a second maintenance state by connecting the seal carrier to the rotor cover. In the second maintenance state, maintenance activities may be performed at other components of the motor without removing the modular sealing system from the motor. The term "other components of the motor" may refer to components that require removal of the stator component for maintenance activities. The stator component may be connected to the sealing system so that maintenance of other components of the motor may typically require removal of the sealing system. It may not be necessary to remove the various embodiments of the modular sealing system disclosed herein and place them on the ground in order to perform maintenance activities at other components of the motor.

[0033] In some embodiments, at least the seal carrier and / or the retaining carrier may be divided into circular segments. For example, at least two segments may each be connected by at least one second connecting means. In some embodiments, the two segments may be connected by a connecting plate. The connecting plate provides circular stiffness to the entire system and may not need to be removed in the event of a change from an operating state to a first maintenance state or a second maintenance state or vice versa.

[0034] In various embodiments, a spring may be arranged between the seal carrier and the stator cover and / or the retaining carrier. The spring may provide a connection and also provide a restoring force. In an operating state, the spring may act on the modular sealing system such that the spring may provide sufficient force to seal the rotor cover. The term "sufficient" as used herein refers to a force sufficient to provide a sealing function.

[0035] According to various embodiments, the spring may be embodied in a Y-shape or a V-shape. These embodiments of the spring may be particularly suitable for making the distance between the seal carrier and the stator cover and / or the retaining carrier very small in the first maintenance state, thereby maximizing the space between the seal carrier and the rotor cover for, for example, maintenance activities. Furthermore, such a design may absorb manufacturing and installation tolerances, thereby increasing design flexibility.

[0036] In various embodiments of the present disclosure, the spring can be embodied as a leaf spring or a diaphragm spring. In some embodiments, the spring can be embodied as a coil spring. In particular, the spring can be embodied as a spring clip.

[0037] According to some embodiments, at least 32 springs can be arranged between the seal carrier and the stator cover and / or the retaining carrier. In particular, at least 64 springs can be arranged between the seal carrier and the stator cover and / or the retaining carrier. Preferably, at least 96 springs can be arranged between the seal carrier and the stator cover and / or the retaining carrier. These embodiments can have the advantage of increased stability of the modular sealing system. Further, compared with using a smaller number of springs, using a larger number of springs to provide sufficient force for the modular sealing system can enable the use of springs of reduced size, in particular, springs of reduced depth. As mentioned above, using a larger number of springs (e.g., at least 64 springs) can make the distance between the seal carrier and the stator cover and / or the retaining carrier even smaller in the first maintenance state, thereby maximizing the space between the rotor cover and the seal carrier.

[0038] According to embodiments in which the modular sealing system may be divided into circular segments, a number of springs that may be arranged between the seal carrier and the stator cover and / or the retaining carrier may be divided according to a number of circular segments of the modular sealing system. For example, the modular sealing system may include 64 springs arranged between the seal carrier and the stator cover and / or the retaining carrier, further, the modular sealing system may be divided into 32 circular segments. Thus, at each circular segment, two springs may be arranged between a seal carrier segment and the stator cover and / or the retaining carrier segment. According to some embodiments, at each circular segment, three springs may be arranged between each seal carrier segment and the stator cover and / or each retaining carrier segment.

[0039] In some embodiments, the seal carrier and / or the retaining carrier may include an indentation for each spring. The springs may be arranged in one or more indentations, respectively, so that the springs may be at least partially sunk in the one or more indentations in the first maintenance state and / or in the second maintenance state, so as to increase the space for replacing the sealing element, for example in the first maintenance state.

[0040] In various embodiments, a curtain seal may be arranged between a seal carrier and a stator cover and / or a retaining carrier. The curtain seal may be compressed in a first maintenance state of the modular sealing system and in an initial shape in an operating state. The curtain seal may simplify the design of the modular sealing system. For example, the curtain seal may be made of a plastic material such as EPDM (ethylene propylene diene monomer rubber) or FKM (fluorocarbon-based fluororubber). In particular, the curtain seal may be embodied as a bendable plate. The bendable plate may be made of a metal material. The term "compressed" as used herein refers to a state in which the extension of the curtain seal in at least one direction may be less than in an uncompressed state. In particular, the curtain seal may have a smaller extension in a compressed state in a direction in which the seal carrier may move toward the stator cover and / or retaining carrier. In various embodiments, the curtain seal may include at least one shoulder having a greater height. In particular, the curtain seal may include two shoulders. The shoulder may be arranged at the edge of the curtain seal. The shoulder may be used to fix the curtain seal. For example, the shoulder can increase the fixing rigidity of the curtain seal.

[0041] According to a particular advantageous embodiment, the seal carrier can carry the sealing element in a forced locking manner. The term "forced locking manner" as used herein refers to a connection between the seal carrier and the sealing element that may not require additional fixing elements to keep the sealing element in its specified position. The groove of the seal carrier can be embodied in a shape that at least partially corresponds to the sealing element. The sealing element can be mounted to the seal carrier by moving the sealing element laterally in the side opening of the circular segment or in the front opening of the groove of the seal carrier. The sealing element may include a forced locking fixing section and a seal section. The seal section can be embodied as a lip seal. In particular, the seal section can be embodied as a double lip seal.

[0042] For example, the groove which may be designated to carry the sealing element may be substantially T-shaped, and the sealing element may be at least partially substantially T-shaped. The groove may be arranged around the entire seal carrier.

[0043] The term "T-shaped" as used herein refers to the design of the groove and the sealing element, which can allow fixing in a forced locking manner and can be similar to the letter T. In particular, the forced locking fixing section of the sealing element can include a first section similar to the I part of the T-shape and a second section similar to the - part of the T-shape. The length of the first section can be substantially the same as the length of the second section, preferably, the second section can include 80% to 120% of the length of the first section. Particularly preferably, the second section can include 90% to 110% of the length of the first section. The first section can include 80% to 120% of the width of the length of the first section. In particular, the width of the first section can include substantially the same as the length of the first section. The second section can include 150% to 250% of the width of the length of the second section. In particular, the second section can include 180% to 220% of the width of the length of the second section. The first section can be arranged to be centered on the second section. In particular, the first section can be arranged to deviate from the center of the second section.

[0044] The groove may include a first portion similar to the I portion of a T and a second portion similar to the - portion of a T. The first portion and the second portion may include substantially the same size as the first section and the first section of the sealing element. The term "substantially the same size" as used herein may refer to a fit that may be suitable for a tight fit and simple installation (e.g., a transition fit) of the sealing element in the groove. In particular, the length of the second portion may be at least 0.5 mm longer than the second section of the sealing element to facilitate installation. Preferably, the length of the second portion may be at least 1 mm longer than the second section of the sealing element.

[0045] For example, the positive locking design can allow the time required for maintenance of the modular sealing system to be reduced by providing a simple hooking of the sealing element rather than holding the sealing element by a fixing element (e.g., screw). The use of a T-shaped design for sealing between the stator and rotor of a gearless mill motor and the use of fixing by bolting, etc. surprisingly provide substantially the same sealing effect, while the probability of failure is similar.

[0046] According to some embodiments, the groove of the seal carrier can be embodied so that the first part can be formed in a rectangular manner and the second part can be formed in a circular manner. The sealing element can be embodied accordingly at least in part. The width of the first part can be smaller than the diameter of the circular second part so as to force the sealing element to lock at the second part. The seal section can be guided out of the groove through the rectangular first part.

[0047] In various embodiments, the retaining carrier and / or the stator cover may include bores and the seal carrier may include threaded holes aligned with the bores. Screws that may be arranged through them may be used to move the seal carrier in the direction toward the retaining carrier or the stator cover.

[0048] With respect to the sealing systems of the prior art, maintenance performed at the modular sealing systems according to the present disclosure or according to the methods of the present disclosure can reduce the required time by about 80%, and it may be necessary to remove these sealing systems and place them on the ground in order to perform maintenance activities at the sealing systems. Further, according to some embodiments of the present disclosure, the modular design (particularly, the modular design including the holding carrier) can allow pre-assembly before the modules are delivered to the site. Pre-assembly can reduce the time required for on-site assembly and may increase the chance of finding faulty components before delivery to the site. Dividing the modular sealing system into circular segments can also facilitate logistics and handling. In particular, because screws or other fixing elements may not have to be loosened and tightened, a sealing device including a forced locking sealing component can save time at the maintenance activity when replacing consumable sealing components. The present disclosure can be applied as a new sealing system for a new product, or may be adapted to an existing motor. Further, the present disclosure provides a motor comprising a stator cover, a rotor cover and a modular sealing system according to the present disclosure; and a gearless mill comprising a mill body and a motor according to the present disclosure.

[0049] Reference will now be made in detail to embodiments of the present disclosure, some examples of which are illustrated in the accompanying drawings. Each example may be provided in a manner that explains the present disclosure rather than limiting the present disclosure. For example, features illustrated or described as part of an embodiment may be used together with other embodiments to derive further embodiments. The accompanying drawings may not be drawn to scale.

[0050] Figure 1Schematically illustrated is an exploded perspective cutaway view of an electric motor according to an embodiment of the present disclosure. The electric motor may be embodied as an annular motor 70 including an axis of rotation 71. Supplying electrical energy to the annular motor 70 may cause the hollow shaft 72 to rotate about the axis of rotation 71. The annular motor 70 may include a stator 73 and a rotor 74. The stator 73 may also include a stator component 75. The rotor 74 may also include a rotor component 76. The rotor 74 may be embodied as an external rotor, so that the stator component 73 and the stator component 75 may be arranged inside. According to some embodiments, the rotor 74 may be embodied as an internal rotor, so that the stator component 73 and the stator component 75 may be arranged outside the rotor component 74 and the rotor component 76. A first sealing gap 77 oriented axially to the axis of rotation 71 may be defined by the stator cover 30 and the rotor cover 40 at the feed side 91, and a second sealing gap 78 oriented axially to the axis of rotation 71 may be defined by the stator cover 30 and the rotor cover 40 at the discharge side 92. According to some embodiments, the first sealing gap 77 and / or the second sealing gap 78 may be oriented radially or obliquely to the rotation axis 71 of the motor. The stator cover 30 may be considered as the component closest to the rotor 74, in particular, since the rotor cover 40 may be considered as the component closest to the stator 73, the stator cover 30 and the rotor cover 40 may mutually define the first sealing gap 77 and the second sealing gap 78. The stator cover 30 and the rotor cover 40 may include several parts. In some embodiments, the stator cover 30 and the rotor cover 40 may literally cover the stator component 75 or the rotor component 76. The size of the first sealing gap 77 may be the same as or different from the size of the second sealing gap 78. A sealing system (not shown) (in particular, a modular sealing system) may be arranged in the first sealing gap 77 and / or the second sealing gap 78. According to some embodiments, a sealing device may be arranged in the first sealing gap 77 and / or the second sealing gap 78.

[0051] Figure 2 A perspective cutaway view of a gearless mill according to an embodiment of the present disclosure is shown. The gearless mill may include an electric motor, in particular, a ring motor 70, and a mill body 80 having a mutual rotation axis 71. The ring motor 70 may be arranged at a feed side 91 of the mill body 80 and may extend less than the mill body 80 in a longitudinal direction 93. A direct drive ring 81 may be mounted to the mill body 80 so that the mill body 80 may be part of the ring motor 70, and vice versa. Supplying electrical energy to the ring motor 70 may cause the mill body 80 to rotate about the rotation axis 71.

[0052] Figure 3A perspective cutaway view of a modular sealing system according to an embodiment of the present disclosure is shown in an operational state 100. A stator cover 30 and a rotor cover 40 are illustrated. The holding carrier 10 may be fixed to the stator cover 30 by a first threaded connection. The connection of the stator cover 30 and the holding carrier 10 may include a sealing arrangement between the holding carrier 10 and the stator cover 30.

[0053] According to an embodiment of the present disclosure, the holding carrier 10 may be connected to the seal carrier 20 by at least two types of connection devices 50 , 53 . Figure 3 By way of example, a Y-shaped spring 50 is shown which can be arranged between the holding carrier 10 and the seal carrier 20 . Figure 3 A second threaded connection 58 is shown between the spring 50 and the carrier 10, 20. The spring 50 may be connected to the retaining carrier 10 by another connection means than the seal carrier 20, for example by hooking.

[0054] The indentation 12 may be provided at the retaining carrier 10 and / or the seal carrier 20 for each spring 50. The indentation 12 may be used to sink the spring 50 in the first maintenance state 200.

[0055] The curtain seal 53 can be arranged between the holding carrier 10 and the seal carrier 20 in the two recesses 57. According to some embodiments, the curtain seal 53 can include a small height, for example, a height less than 5 mm. In particular, the curtain seal 53 can include a height less than 3 mm. Preferably, the curtain seal 53 can include a height less than 2 mm. In order to ensure fixation, a friction enhancement bead 56 can be arranged at the edge of the curtain seal 53. The bead 56 can also provide a sealing effect and can be arranged at the top (as shown) and / or below the curtain seal 53. According to various embodiments, the height of the fixed edge of the curtain seal 53 may be greater than the height of the middle area to increase the rigidity of the fixed place. In particular, the edge can include a height of at least 1 mm. Preferably, the edge can include a height of at least 3 mm. Particularly preferably, the edge of the curtain seal 53 can include a height of at least 5 mm. In particular, these edges can be embodied as shoulders. In various embodiments, the curtain seal 53 can be made of a plastic material. In various embodiments, the curtain seal 53 can be made of a metal material.

[0056] Finally, the fixing can be provided, for example, by a first screw 59a which can be screwed through a hole so as to push against the pressure strip 56. According to various embodiments, the curtain seal 53 can be embodied such that the curtain seal 53 can be fixed to the seal carrier 20, the holding carrier 10 and / or the stator cover 30 in a positively locking manner.

[0057] Still reference Figure 3, the seal carrier may include four sealing elements 21, 23: two lip seals 21 and two main seals 23. The sealing elements 21, 23 may be fixed by a fixing member, which may be, for example, a plurality of first screws 59b according to the fixing of the curtain seal 53. In various embodiments, the main seal 23 may be fixed by a clamping fixing member. The clamping fixing member may be embodied in a circular shape and include a recess. Rotating the clamping fixing member may fix or release the main seal 23.

[0058] The spring 50 may provide a restoring force 62 acting at least on the seal carrier 20 , so that the sealing elements 21 , 23 may be pressed against the rotor cover 40 in order to ensure sealing.

[0059] Figure 4 A cross-sectional view of a modular sealing system according to an embodiment of the present disclosure in a first maintenance state 200 is shown. To set the modular sealing system to the first maintenance state 200, a second screw 52 may be screwed through a first bore 31 of the stator cover 30 and a second bore 11 of the holding carrier 10 and screwed into a first threaded hole 25 of the seal holder 20. The bores 31, 11 and the threaded hole 25 may be aligned. The second screw 52 may be different from or the same as the first screw 59. Screwing in the second screw 52 may move the seal carrier 20 in a direction 60 toward the holding carrier 10, such that a distance 61 between the seal carrier 20 and the holding carrier 10 may be reduced. The seal carrier 20 may be moved from its initial position in a direction opposite to the rotor cover 40. The curtain seal 53 is illustrated as being in a compressed state. The spring 50 may be in a more compressed state than in the operating state 100.

[0060] A gap 63 may be produced between the rotor cover 40 and the seal carrier 20 and this gap 63 may make it possible to replace the sealing elements 21 and 23 after the fixing of the sealing elements 21 , 23 has been released.

[0061] In order to move the seal carrier 20 back to its initial position, ie the position of the operating state 100 , the second screw 52 may be loosened.

[0062] Figure 5 A perspective cutaway view of a second maintenance state 300 of an embodiment of the present disclosure is illustrated. The retaining carrier 10 may be connected to the seal carrier 20 via a curtain seal 53, a Y-shaped spring 50 and / or a second screw 52. The seal carrier 20 may include four sealing elements 21, 23 and may be connected to the rotor cover 40 via a clamp 54.

[0063] The clamp 54 may be fixed by a third screw 54a screwed into the second threaded hole 26 of the seal carrier 20, and may be mounted to the rotor cover 40 by a fourth screw 54b which may be threaded against the rotor cover 40. The clamp 54 may be frictionally connected to the rotor cover 40. In order to increase the stability of the connection, a friction increasing strip may be arranged at the contact surface of the clamp 54 with the rotor cover 40. The third screw 54a and / or the fourth screw 54b may be different from or the same as the first screw 52 and / or the first screw 59.

[0064] To place the modular sealing system in the second maintenance state 300, the modular sealing system may be placed in the first maintenance state 200. Subsequently, the clamp 54 may be secured to the rotor cover 40 and the seal carrier 20 as described above. The retaining carrier 10 may be released from the stator cover 30 so that other components may be maintained without removing the entire modular sealing system. To release the load on the spring 50, the screw 52 may be removed as described above. Figure 5 Unscrew as shown.

[0065] Figure 6 A perspective view of an embodiment of a modular sealing system according to the present disclosure is shown. In particular, the modular sealing system can be divided into circular segments. On one side between the holding carrier 10 and the seal carrier 20, a rectangular recess 55 can be provided. A connecting plate 51 can also be provided for connecting two segments of the holding carrier 10 and / or the seal carrier 20. The connecting plate 51 can be fixed by fixing members, such as, for example, by a plurality of screws.

[0066] The connecting plate 51 can increase the rigidity of the entire modular sealing system. The entire modular sealing system can be divided into several circular segments, which can be suitable for convenient handling and logistics and will not disproportionately increase the workload of assembly, that is, considering the size of this modular sealing system, it can be divided into at least four, particularly at least eight, preferably at least 16, particularly preferably at least 32 circular segments.

[0067] Figure 7 An embodiment of a seal carrier 1 with a sealing component according to the present disclosure is shown. The seal carrier 1 may include a substantially T-shaped groove 3. A sealing component 2 is illustrated, which may at least partially include a substantially T-shape and may be embodied as a lip seal. The sealing component 2 may be fixed to the seal carrier 1 in a positive locking manner.

[0068] The groove 3 may include a first portion similar to the I portion of a T-shape and a second portion similar to the — portion of a T-shape. Thus, the sealing member 2 may at least partially include a first section and a second section. Figure 7As shown, the length of the second portion of the groove 3 may be greater than the length of the second section of the sealing member 2. The lengths of the first section and the second section of the sealing member 2 may be substantially the same. The first section may be centered on the second section. The first portion may be centered on the second portion.

[0069] According to various embodiments, the seal carrier 1 may be a circular segment of a sealing device. The sealing component 2 may be mounted to the seal carrier 1 by laterally moving the sealing component 2 in the groove 3 .

[0070] Thus, a modular sealing system has been presented in the foregoing description with reference to specific examples. In particular, a sealing device has been presented in the foregoing description with reference to specific examples. It should be understood that the various aspects disclosed herein may be combined in combinations different from the specific combinations presented in the accompanying drawings. It should be appreciated that various modifications may be made to the cited examples without departing from the scope of the present disclosure and the appended claims.

Claims

1. A modular sealing system for sealing between a stator cover (30) and a rotor cover (40) of an electric motor for a gearless mill, comprising: a seal carrier (20) for carrying at least one sealing element (21) for sealing the rotor cover (40), wherein the seal carrier (20) is connected to the stator cover (30) so as to be movable in a direction toward the stator cover (30), and The modular sealing system further comprises at least one operating state (100) and a first maintenance state (200), Wherein in the first maintenance state (200), the distance (63) between the rotor cover (40) and the seal carrier (20) is greater than the distance in the operating state (100).

2. A modular sealing system according to claim 1, wherein the modular sealing system is divided into at least two circular segments, preferably at least eight segments, in particular at least 16 segments, particularly preferably at least 32 segments.

3. The modular sealing system according to any one of the preceding claims, wherein the modular sealing system further comprises a holding carrier (10) for providing a connection to the stator cover (30), and The seal carrier (20) is connected to the retaining carrier (10) so as to be movable in directions (60) towards each other.

4. The modular sealing system according to any one of the preceding claims, wherein the seal carrier (20) is connectable to the rotor cover (40), and The modular sealing system further comprises a second maintenance state (300) wherein the seal carrier (20) is attached to the rotor cover (40) via a first connection device (54) and the stator cover (30) is disconnected from the modular sealing system.

5. A modular sealing system according to claim 2 or according to claim 3 or 4 as dependent on claim 2, wherein the at least two circular segments are connected by at least one second connecting device (51) between the two segments.

6. A modular sealing system according to any one of claims 3 to 5, wherein a restoring force (62) is acting at least on the seal carrier (20), and The retaining carrier (10) and the seal carrier (20) are preferably connected to each other via at least one spring (50), the at least one spring (50) also supplying at least the restoring force (62) acting on the seal carrier (20).

7. The modular sealing system according to claim 6, wherein the at least one spring (50) is embodied in a Y-shape or a V-shape.

8. Modular sealing system according to claim 6 or 7, wherein the retaining carrier (10) and the seal carrier (20) are connected to each other by at least 64 springs (50), in particular by at least 96 springs (50).

9. Modular sealing system according to any one of claims 3 to 8, wherein a curtain seal (53) is arranged between the retaining carrier (10) and the seal carrier (20).

10. Modular sealing system according to any of the preceding claims, wherein the at least one sealing element (21) is carried by the seal carrier (20) in a positive locking manner.

11. A modular sealing system according to claim 10, wherein the forced locking is achieved by the seal carrier (20), the seal carrier (20) further comprising at least one substantially T-shaped groove, and the at least one sealing element (21) is at least partially embodied as a substantially T-shaped shape.

12. A modular sealing system according to any one of claims 3 to 11, wherein the retaining carrier (10) further comprises at least one bore (11), and the seal carrier (20) further comprises at least one threaded hole (25), A screw (52) is screwed into the threaded hole (25) and passed through the bore (11), so that the distance (63) between the rotor cover (40) and the seal carrier (20) can be adjusted by tightening the screw (52).

13. An electric motor comprising a rotor cover (40), a stator cover (30) and a modular sealing system according to any one of the preceding claims.

14. A gearless mill comprising a mill body (80) and the electric motor according to claim 13.

15. A method for replacing a sealing element (21, 23) of a sealing system for an electric motor of a gearless mill in an installed state, comprising: a) moving the seal carrier (20) from an initial position in a direction opposite to the rotor cover (40), b) replacing the sealing element (21, 23), c) moving the seal carrier (20) to the initial position.

16. A sealing device for sealing between a stator and a rotor of an electric motor for a gearless mill, comprising: A seal holder (1) divided into at least two circular segments; as well as Sealing member (2), wherein the seal holder (1) comprises a substantially T-shaped groove (3), and wherein the sealing member (2) is at least partially embodied in a substantially T-shape, and The sealing component (2) is fixed in the groove (3) of the seal holder (1) in a positive locking manner by means of the substantially T-shape.

17. Use of a sealing component (2), the sealing component (2) being at least partially embodied in a substantially T-shape, for sealing between a stator and a rotor of an electric motor for a gearless mill, The sealing component (2) is fixed between the stator and the rotor in a positive locking manner through the substantially T-shape.

18. Use of the sealing component (2) according to claim 17 in the sealing device according to claim 16.

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