mechanical seal arrangement

Abstract

comprising a mechanical seal arrangement (10): - a sealing body (11) that can be driven to rotate about an axis of rotation (D) and which has a sealing surface (14) on a first axial side (15) that is designed to slide against a contact surface (40) when the sealing body (11) rotates about the axis of rotation (D), wherein the sealing body (11) is monolithic and made of plastic material, - several permanent magnetic or magnetizable retaining elements (30) arranged on the sealing body (11), - at least one permanent magnetic or magnetizable counter-holding body (39), - several retaining recesses (31) arranged circumferentially (U) around the axis of rotation (D) at intervals from each other in the sealing body (11), wherein each retaining recess (31) has a mounting opening (33) on a second axial side (32) of the sealing body (11) facing away from the first axial side (15), through which one of the retaining bodies (30) can be inserted into the retaining recess (31) in an axial direction (A) parallel to the axis of rotation (D) and / or removed from the retaining recess, wherein each retaining recess (31) is bounded by a recess wall (34) of the sealing body (11) following the mounting opening (33), so that a retaining body (30) inserted into an associated retaining recess (31) is held radially to the axis of rotation (D) by means of the recess wall.

Description

[0001] The invention relates to a mechanical seal assembly with a sealing body having a sealing surface. In the installed state of the mechanical seal assembly, or of the sealing body, the sealing surface slides against a contact surface to fluidically seal an area between the sealing surface and the contact surface. The sealing body is rotatably mounted about an axis of rotation, and the sealing surface is oriented substantially perpendicular to this axis. A component on which the contact surface is mounted can be fixed or immovable in the circumferential direction about the axis of rotation.

[0002] Such a mechanical seal arrangement is known, for example, from CN 111306303 A. The seal body consists of polytetrafluoroethylene (PTFE) with a ring of iron oxide (Fe3O4). The ring is secured to the PTFE body by radially extending threaded bolts.

[0003] EP 0 351 554 A1 describes a mechanical seal with a rotating ring and a counter ring stationary around the axis of rotation. The counter ring is a permanent magnet, and the rotating ring is ferromagnetic. They bear against each other at their sliding surfaces and are attracted to each other by a magnetic force. The counter ring has a coating of a diamond-like carbon on its sliding surface for wear and corrosion resistance.

[0004] Another mechanical seal is known from GB 1 256 549 A. This mechanical seal has a rotating ring and a stationary ring, which bear against each other in the axial direction parallel to the axis of rotation. The stationary ring is made of magnetizable material. The rotating ring has a series of blind holes circumferentially around the axis of rotation, open towards the stationary ring. Permanent magnets are arranged in these blind holes. The permanent magnets have different magnetic pole orientations in the axial direction, so that the magnetic north pole of some permanent magnets and the magnetic south pole of others is associated with the rotating ring.

[0005] Starting from the prior art, it is an object of the present invention to create a mechanical seal arrangement which has a simple design and enables easy assembly and disassembly of the mechanical seal arrangement.

[0006] This problem is solved by a mechanical seal arrangement with the features of claim 1.

[0007] The mechanical seal assembly according to the present invention comprises a sealing body with a first axial side and a second axial side opposite the first axial side. A sealing surface is provided on the first axial side. In the installed position, the sealing surface slides against an associated contact surface. A sealing effect is thereby achieved in the contact area between the sealing surface and the contact surface to prevent the passage of a fluid (gas and / or liquid). The mechanical seal assembly is therefore a fluid seal.

[0008] The installation position of the mechanical seal assembly refers to the state when the mechanical seal assembly is fully assembled at its installation location, for example in a pump or other fluid-conducting and / or conveying device or machine.

[0009] The sealing body is a monolithic body made of plastic. Alternatively, it is also possible for the sealing body to have two or more parts, for example, a base part with a coating on the first axial side to form the sealing surface. In one embodiment, the sealing body is made of polytetrafluoroethylene, for example.

[0010] The sealing body can, for example, have a cylindrical outer contour or a stepped cylindrical outer contour with at least two cylindrical sections that have different diameters.

[0011] The sealing element can be fixed to a rotating component in its installed position, for example, a rotating driven or driveable shaft. In any case, the sealing element is rotatably mounted about an axis of rotation, whereas the contact surface is preferably stationary in a circumferential direction about the axis of rotation. At least during operation of a machine or device incorporating the mechanical seal assembly, the sealing surface and the contact surface can move relative to each other in a circumferential direction about the axis of rotation. The contact surface can, for example, be located on a stationary component that is not rotatable about the axis of rotation. For example, the mechanical seal assembly can be used in a pump, particularly a gear pump.

[0012] The mechanical seal assembly comprises at least one permanent magnetic or magnetizable retaining element, which is separate from the seal body and can, for example, be arranged immovably in the circumferential direction adjacent to the axis of rotation and preferably at a distance from the first axial side of the seal body. Several permanent magnetic or magnetizable retaining elements are arranged on the seal body. It is sufficient if either the retaining elements or the at least one retaining element is permanent magnetic. For example, the retaining elements can be permanent magnetic and the retaining element can have magnetizable material, or vice versa. However, both the retaining elements and the at least one retaining element can also be permanent magnetic.

[0013] In the installed position of the mechanical seal assembly, a net magnetic force is generated in an axial direction between the retaining elements and the at least one counter-retaining element. The axial direction is oriented parallel to the axis of rotation.

[0014] The magnetizable material is preferably ferromagnetic, or alternatively ferrimagnetic. The magnetizable material can, for example, be a ferromagnetic metallic alloy.

[0015] The permanent magnetic material can be, for example, a hard magnetic ferrite, a rare earth magnet (e.g., made of a neodymium alloy), an aluminum-nickel-cobalt alloy, a bismuth-manganese-iron alloy, a plastic magnet material, or any combination thereof.

[0016] To attach the retaining elements to the sealing body, the latter has several retaining recesses. These recesses are arranged circumferentially around the axis of rotation, spaced apart from one another and preferably evenly spaced around the axis of rotation. The retaining recesses may be blind holes. Each retaining recess has a mounting opening on a second axial side facing away from the first axial side. The mounting opening is dimensioned and / or designed such that a retaining element can be inserted into the associated retaining recess through the mounting opening and / or a retaining element located in the retaining recess can be removed through the mounting opening. Apart from the mounting opening, none of the retaining recesses has any further opening through which the retaining element could be inserted or removed.Preferably, the retaining recesses are, apart from the mounting opening, at least predominantly or completely closed by a recess wall adjoining the mounting opening.

[0017] A retaining element inserted into a retaining recess is held there in a radial direction, radial to the axis of rotation, by a recess wall that delimits the retaining recess. In particular, each retaining element is held in the retaining recess against undesirably large movement in the radial direction. Preferably, an interference fit can be avoided to simplify the insertion and removal of the retaining elements from the respective retaining recess – thus, a clearance can exist between each retaining element and the corresponding recess wall around the retaining recess, allowing for sliding relative movement in the axial direction.

[0018] Additional mechanical and / or material fasteners for fixing the retaining elements in the retaining recesses are unnecessary. In particular, a material bond between the retaining elements and the sealing body is avoided. Additional retaining or fixing elements, such as threaded bolts, locking elements, or clamping elements that secure the retaining elements, are also unnecessary. This is because the retaining elements are held radially by the sealing body itself, and axially, the retaining elements are forced, or in particular pulled, away from the mounting opening into the retaining recess by the magnetic attraction of at least one opposing retaining element.

[0019] This design allows the retaining elements to be inserted into or removed from the retaining recesses very easily and, optionally, without tools. The respective mounting opening facilitates this process. Additional adhesive, screw, or snap-fit ​​connections are unnecessary. This simplifies the assembly and disassembly of the mechanical seal assembly. In particular, disassembly can be achieved by first removing one or more retaining elements from the seal body, thereby reducing the total axial magnetic force between the seal body and the counter-retaining element. The total magnetic force corresponds to the sum of the individual magnetic attraction forces between all retaining elements arranged on the seal body and the at least one counter-retaining element.If the total magnetic force has been sufficiently reduced by removing one or more retaining elements from the sealing body, the sealing body can then be moved away from the counter-retaining element or the contact surface in the axial direction.

[0020] Additionally or alternatively, the total axial magnetic force acting during the assembly of the mechanical seal assembly can be gradually changed and, in particular, increased during different assembly phases by varying the number of retaining elements used, thus enabling simple and safe assembly. For example, the maximum total magnetic force can be generated only at the end of the assembly by initially not inserting all retaining elements into the retaining recesses. This facilitates handling during assembly and also reduces the risk of accidentally trapping objects or a finger.

[0021] The sealing body preferably comprises a sealing part with a sealing surface and a retaining part arranged at a distance from the sealing surface. The retaining part includes the retaining recesses. The retaining part preferably has an end face on its first axial side, which is arranged at a distance from the sealing surface in the axial direction. The sealing surface may be located on an axial projection of the sealing body. Preferably, the sealing surface is arranged closer to the axis of rotation than the end face of the retaining part.

[0022] The sealing element and the retaining element can each have a cylindrical outer contour. The outer diameter of the sealing surface can correspond to the inner diameter of the end face of the retaining element.

[0023] As explained, in the installed position, a total axial magnetic force is generated between the counter-retaining body on the one hand and the retaining elements arranged on the sealing body on the other, thereby pressing the sealing surface of the sealing body against the contact surface. In one embodiment, the total magnetic force in the installed position of the mechanical seal assembly is so large that manually moving the sealing body axially away from the counter-retaining body is not possible, or not easily possible (e.g., not without additional tools). In the installed position (i.e., in the fully assembled state) of the mechanical seal assembly, the total axial magnetic force can be, for example, at least 150 N, at least 200 N, or at least 300 N. Preferably, the total axial magnetic force in the installed position of the mechanical seal assembly is a maximum of 500 N or 450 N.

[0024] In a preferred embodiment, the counter-holding element is a counter-holding ring (for example, a circular ring or a polygonal ring). The counter-holding ring can be arranged coaxially to the axis of rotation. Regardless of its exact geometric shape, the at least one counter-holding element preferably completely surrounds the axis of rotation in the circumferential direction. Several counter-holding elements can also be arranged circumferentially distributed around the axis of rotation – with or without a circumferential spacing. The counter-holding element is preferably an integral part of a housing or a housing component, for example, a pump housing.

[0025] In all embodiments of the mechanical seal arrangement, it is sufficient to use a single counter-retaining element, for example a counter-retaining ring.

[0026] In the installed position of the mechanical seal assembly, the sealing body is preferably fixed to a rotating component that can be driven to rotate about its axis of rotation. The rotating component can, for example, be a shaft or another rotating component driven by the rotor of a motor. Thus, the sealing body is fixed in the circumferential direction about the axis of rotation relative to the rotating component. In one embodiment, the rotating component is the shaft of a pump, preferably a gear pump.

[0027] It is preferred if the sealing body is arranged to be axially displaceable relative to the rotating component. For example, the rotating component may have an axially extending elongated hole into which a projection on the sealing body engages, allowing axial displacement in the direction of the elongated hole and preventing movement perpendicular to the direction of the elongated hole. Such a projection can be formed by the end of a pin that can be attached to the sealing body.

[0028] It is preferred that, in the installed position of the mechanical seal assembly, an axial gap exists between the sealing body and the counter-retaining body, at least when the sealing body and the contact surface are still free of wear, i.e., in an unused initial state. This axial gap prevents additional friction between the sealing body and the counter-retaining body when the sealing body rotates around its axis of rotation. Furthermore, by monitoring the axial gap, wear occurring in the area of ​​the sealing surface and / or the contact surface of the sealing body can be detected, determined, and / or monitored. The size of the axial gap can thus serve as an indicator of the wear condition of the sealing body and / or the contact surface.

[0029] It is advantageous if the sealing body has a through-opening extending along the axis of rotation. For example, a rotating component, on which the sealing body is mounted, can extend through the through-opening. In the region of the through-opening, at least one sealing ring can be arranged on the sealing body, which is oriented coaxially to the axis of rotation. For example, this can create a fluidic seal between the sealing body and a rotating component (e.g., a shaft).

[0030] Any embodiment of the mechanical seal assembly can be mounted as follows:

[0031] The retaining element is positioned in the region of the axis of rotation, in particular such that either an annular retaining element coaxially surrounds the axis of rotation or several retaining elements are arranged distributed around the axis of rotation. The sealing element is rotatably positioned around the axis of rotation so that its sealing surface faces a contact surface and can slide against it. For example, the sealing element can be attached to a rotating component that can be driven to rotate around the axis of rotation. At this assembly stage, at least not all retaining elements are yet inserted into the retaining recesses. However, it is possible to insert a subset of the available retaining elements into their respective retaining recesses before positioning the sealing element around the axis of rotation (e.g., attaching it to the rotating component).

[0032] Following this, all retaining elements, or those not yet inserted, are placed into their respective recesses. As explained, each recess has a mounting opening for this purpose. After insertion, the retaining elements are not secured to the sealing body by any further locking mechanisms, but are held in place by the sealing body itself and the magnetic force acting axially towards at least one counter-retaining element, and thus away from the mounting opening. Once all retaining elements are in place, a sufficiently strong overall magnetic force is generated in the axial direction between all retaining elements on the sealing body and the counter-retaining element. This overall magnetic force presses the sealing surface against the mating surface. The mechanical seal assembly is then ready for use.

[0033] Disassembly of any embodiment of the mechanical seal assembly is performed in the reverse order of assembly. First, at least one, several, or even all of the retaining elements are removed from their respective retaining recesses, for which purpose the mounting opening of each recess is used. Because the retaining elements are not secured to the seal body by any additional means, removal can be carried out very easily by hand. When not all or no retaining elements are present on the seal body, the overall axial magnetic force is reduced or eliminated, and the seal body can be moved axially away from the counter-retaining element, so that the sealing surface moves away from the corresponding contact surface.

[0034] Following this, the sealing body and / or the counter-holding body can be removed, repaired or cleaned, as required.

[0035] Advantageous embodiments of the invention are described in the dependent claims, the description, and the drawing. Preferred embodiments of the invention are explained in detail below with reference to the accompanying drawing. The drawing shows: Fig. 1 A schematic representation of an embodiment of a mechanical seal arrangement in a view perpendicular to an axis of rotation, Fig. 2 a perspective view of an embodiment of a sealing body looking towards an axial side facing away from a sealing surface of the sealing body and Fig. 3 a sectional view through the embodiment of the sealing body along section line III-III in Fig. 2.

[0036] In Fig. Figure 1 is a highly schematic illustration of an embodiment of a mechanical seal assembly 10. The mechanical seal assembly 10 has a sealing body 11, which, in the embodiments described here, comprises a sealing part 12 and a retaining part 13. The sealing body 11 has a sealing surface 14 on the sealing part 12. The sealing surface 14 is located on a first axial side 15 of the sealing body 11 and is, for example, oriented perpendicular to a rotational axis D about which the sealing body 11 can be rotatably arranged. In the embodiment, the sealing surface 14 is designed as an annular surface and coaxially surrounds the rotational axis D.

[0037] A direction parallel to the axis of rotation D is called the axial direction. A direction radial to the axis of rotation D is called the radial direction. A direction along a circular path around the axis of rotation is called the circumferential direction U or direction of rotation.

[0038] The sealing body 11 is designed to be attached to a rotating component 20. The rotating component 20 can be driven to rotate about the axis of rotation D. In one embodiment, the rotating component 20 can be a shaft 21 ( Fig. 1) For example, the shaft 21 can be driven by a motor to rotate around the axis of rotation D.

[0039] To attach the sealing body 11 to the shaft 21, the sealing body 11 can have a through-opening 24. The through-opening 24 has a contour and dimensions that essentially correspond to the contour and dimensions of the shaft 21. For sealing against the shaft 21, one or more annular grooves 25 can be provided in the area of ​​the through-opening in the sealing body 11 and preferably in the retaining part 13, into each of which a sealing ring 26 can be inserted. One sealing ring 26 or two annular grooves 25 with two sealing rings 26 are shown by way of example in the Fig. 1 and Fig. Figure 3 shows the number of ring grooves 25 and sealing rings 26. The number of ring grooves 25 and sealing rings 26 can vary and be defined depending on the application.

[0040] In this embodiment, the sealing part 12 and the retaining part 13 each have a circular cylindrical outer contour. Viewed in the axial direction A, the sealing body 11 is therefore partially cylindrical overall. By way of example, the diameter of the retaining part 13 is larger than the diameter of the sealing part 12, so that an end face 16 is formed on the retaining part 13 adjacent to the sealing part 12 on the first axial side 15.

[0041] The mechanical seal assembly 10 also has several retaining elements 30, which are arranged or can be arranged on the sealing body 11. For this purpose, the sealing body 11 has a retaining recess 31 for each retaining element 30. Each retaining recess 31 is at least partially, but preferably completely, closed in the axial direction A towards the first axial side 15 and is accessible via a mounting opening 33 towards a second axial side 32 opposite the first axial side 15. The mounting opening 33 is, for example, formed by the opening of the retaining recess 31 on the second axial side 32 of the sealing body 11.

[0042] In the embodiment illustrated here, the retaining recesses 31 are arranged in the retaining part 13 of the sealing body 11 and have a greater distance to the axis of rotation D than the sealing surface 14 on the sealing part 12.

[0043] In the exemplary embodiment, the retaining recesses 31 are cylindrical. Depending on the shape and, in particular, the cross-sectional shape of the retaining elements 30, the retaining recesses 31 can also have a different contour adapted to the shape of the retaining elements 30. The cross-section of the retaining recesses 31 in the axial direction A is preferably constant.

[0044] Following the respective mounting opening 33, each retaining recess 31 is bounded by a recess wall 34, which may have an annular, closed shape. The recess wall 34 secures a retaining element 30 inserted into the retaining recess 31 against unwanted movement in the radial direction R relative to the sealing element 11. Each retaining recess 31 can be dimensioned such that an inserted retaining element 30 is positively locked in the radial direction R by means of the recess wall 34, but can slide in the axial direction A. Thus, there is a clearance between the retaining element 30 and the recess wall 34.

[0045] On the side opposite the mounting opening 33, each retaining recess 31 is partially or completely closed, so that a retaining element 30 inserted into the retaining recess 31 cannot be removed from the retaining recess 31 in axial direction A towards the first axial side 16 of the sealing body 11. Preferably, each retaining recess 31 is bounded on the side opposite the mounting opening 33 by a recess bottom 35 and, in particular, is completely closed. The recess wall 34 and the recess bottom 35 are formed by the sealing body 11. In the exemplary embodiment, the retaining recesses 31 are designed as blind holes.

[0046] The number of retaining recesses 31 and retaining bodies 30 can vary. In the fully assembled state, exactly one retaining body 30 is arranged in each retaining recess 31. The retaining recesses 31 are arranged circumferentially U around the axis of rotation D at a distance from each other and, in particular, regularly distributed ( Fig. 2) Depending on the size of the sealing body and the application, the number of retaining openings 31 can be appropriately selected, preferably with at least 3 or at least 4 or at least 5 retaining recesses 31 and correspondingly at least 3, at least 4 or at least 5 retaining bodies 30 being present.

[0047] The retaining elements 30 arranged on the sealing body 11 are designed to interact with at least one, and by way of example exactly one, counter-retaining element 39 and thereby generate a total magnetic force F in the axial direction – at least in the installed position of the mechanical seal assembly 10 (i.e., in the fully assembled state of the mechanical seal assembly 10). The total force F acting in the axial direction A forces the sealing body 11 with its sealing surface 14 against a contact surface 40 in order to fluidically seal the contact area between the sealing surface 14 and the contact surface 40.

[0048] The counter-holding body 39 surrounds the axis of rotation D in an annular and preferably coaxial manner. It can be designed as a counter-holding ring. The counter-holding body 39 or counter-holding ring is, for example, arranged opposite the end face 16 of the holding part 13 in the axial direction A.

[0049] Instead of a single counter-holding body 39 enclosing the axis of rotation D in a ring-like manner, several counter-holding bodies 39 can alternatively be arranged in the circumferential direction U around the axis of rotation D, wherein counter-holding bodies 39 adjacent to each other in the circumferential direction U can be in direct contact or arranged at a distance from each other. If several counter-holding bodies 39 are present, they are preferably arranged in the circumferential direction U evenly distributed around the axis of rotation D.

[0050] The contact surface 40 is preferably located on a preferably stationary component 41, which, when the rotating component 20 rotates, does not rotate together with the rotating component 20 about the axis of rotation D, but preferably remains stationary in the circumferential direction U about the axis of rotation D. Alternatively, the contact surface 40 could also be located on a component 41 that rotates about the axis of rotation D with a different direction or speed relative to the rotating component 20 or the sealing body 11, so that a relative movement between the contact surface 40 and the sealing surface 14 can occur when the mechanical seal arrangement 10 is used.

[0051] If the contact surface 40 and the sealing body 11 are still unused and not subject to wear, the sealing body 11 has an axial distance x to the counter-support body 39 in the installed position of the mechanical seal assembly 10. This prevents additional friction during the intended use of the mechanical seal assembly 10. The size of the axial distance x can also serve as an indicator of wear occurring in the area of ​​the sealing surface 14 and / or the contact surface 40 and can be monitored, for example, manually by an operator or automatically by a suitable sensor device.

[0052] The counter-holding body 39 is preferably attached to the component 41, for example by means of a screw connection or another detachable or non-detachable connection.

[0053] In preferred embodiments, the counter-holding body 39 consists of a magnetizable material, in particular a ferromagnetic or ferrimagnetic material. The at least one counter-holding body 39 is, for example, not permanently magnetic.

[0054] To generate a magnetic attraction, the holding bodies 30 are made of or contain permanent magnetic material. The magnetic poles are aligned in the axial direction A. Preferably, all magnetic north poles or all magnetic south poles face the first axial side 15.

[0055] In a modification of the preferred embodiments, the at least one counter-holding body 39 could also be permanent magnets, and the holding bodies 30 could be non-permanent magnets, but magnetizable. In a further modification, both the holding bodies 30 and the at least one counter-holding body 39 could be permanent magnets, although this is not strictly necessary. In this case, the magnetic north poles of the holding bodies 30 would be arranged adjacent to the magnetic south poles of the at least one counter-holding body 39 (or vice versa) in order to generate the magnetic attraction force in the axial direction A.

[0056] The sealing element 11 is preferably arranged on the rotating body 20 or the shaft 21 such that it is movable relative to the rotating body 20 or the shaft 21 in the axial direction A and, in particular, is linearly movable. For this purpose, the rotating component 20 or the shaft 21 may, for example, have an elongated hole or an axial groove into which a radial projection 42 of the sealing element 11 engages. The radial projection 42 may, for example, project radially into the through-opening 24 in the radial direction R.

[0057] The radial projection 42 can, for example, be formed by one end of a pin (e.g., a threaded pin) that can be attached to the sealing body 11. To insert a pin into the sealing body 11, the sealing body can have a corresponding pin holder 43, for example, a radial hole 44 that passes through the sealing body between a radially outwardly facing circumferential surface and the through-opening 24. Fig. 3) The radial hole 44 is arranged in particular between two retaining recesses 31 in the retaining part 13 of the sealing body 11. In modification of the illustration in Fig. 3 The pin holder 43 could also be formed by a hole in the sealing body 11 extending obliquely to the radial direction and obliquely to the axis of rotation D.

[0058] The mechanical seal device 10 can be mounted as follows:

[0059] The sealing body 11 is arranged on the rotating component 20 so as to be rotationally fixed in the circumferential direction U and preferably movable or displaceable in the axial direction A. Prior to or following this, at least one retaining element 31 is attached to the component 41. As long as the retaining elements 30 are not arranged in the retaining recesses 31 on the sealing body 11, no magnetic attraction force is generated in the axial direction A. The sealing body 11 can therefore preferably be moved in the axial direction A relative to the rotating component 20 or the shaft 21, so that the sealing surface 14 can be moved towards or away from the contact surface 40. When the sealing surface 14 is in contact with the contact surface 40 of the component 41, there is preferably an axial distance x between the sealing body 11 and the at least one retaining element 31.In the embodiment, a single counter-holding body 39 is present, which surrounds the sealing part 12 of the sealing body 11 in an annular manner and is opposite the end face 16 of the holding part 13 of the sealing body 11, forming the axial distance x.

[0060] To generate the magnetic attraction force and the desired total magnetic force F, the retaining elements 30 are inserted into the retaining recesses 31. When all retaining elements 30 are arranged in the retaining recesses 31, a total magnetic force F is generated which corresponds to the sum of the individual magnetic attraction forces between each retaining element arranged on the sealing body 11 and the at least one or exactly one counter-retaining element 39.

[0061] In the installed position of the mechanical seal assembly 10, the sealing surface 14 and the contact surface 40 are pressed together in such a way that the connection between the sealing surface 14 and the contact surface 40 is maintained during operation in order to achieve a sealing effect in this area of ​​the assembly that can prevent the passage of a fluid (for example, a liquid).

[0062] In the installed position of the mechanical seal assembly 10, the total magnetic force F can be relatively large, making manual separation of the sealing surface 14 from the contact surface 40 impossible or nearly impossible. Therefore, the mechanical seal assembly can be disassembled, for example, as follows:

[0063] With the rotating component 20 at rest, one, several, or preferably all of the retaining elements 30 are first removed from the retaining recesses 31 via the mounting openings 33. The total magnetic force F acting between the sealing element 11 and the at least one counter-retaining element 39 thereby decreases, so that the sealing element 11 can finally be moved away from the contact surface 40 in the axial direction A. Subsequently, the components of the mechanical seal assembly 10 can be removed, exchanged, cleaned, or replaced as required.

[0064] Generally speaking, the disassembly steps can be carried out in a sequence that is the reverse of the assembly sequence.

[0065] The invention relates to a mechanical seal assembly 10 with a sealing body 11 rotatable about an axis of rotation D, at least one counter-retaining body 39 which is formed separately from the sealing body 11, and several retaining bodies 30 which can be detachably arranged on the sealing body 11. For this purpose, the sealing body 11 has a retaining recess 31 for each retaining body 30, accessible via a mounting opening 33, into which a respective retaining body 30 can be loosely inserted without the need for securing or fixing it by means of additional retaining elements, adhesives, or the like. The retaining bodies 30 and the at least one counter-retaining body 39 are designed such that a total magnetic force F is generated parallel to the axis of rotation D in order to press a sealing surface 14 on the sealing body 11 against an associated contact surface 40, so that the area between the contact surface 40 and the sealing surface 14 can be fluidically sealed. Reference symbol list: 10 Mechanical seal arrangement 11 sealing bodies 12 Sealing part 13 Holding part 14 Sealing surface 15 first axial side 16 Front surface 20 Rotating component 21st wave 24 Through opening 25 Ring groove 26 sealing ring 30 holding bodies 31 Retaining recess 32 second axial side 33 Mounting opening 34 recess wall 35 depression bottom 39 Counterholding bodies 40 m² of installation area 41 Component 42 radial lead 43 Pen holder 44 radial holes A Axial direction D axis of rotation F Total force R Radial direction U circumferential direction x Axial distance QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 111306303 A

[0002] EP 0 351 554 A1

[0003]

Claims

[1] comprising a mechanical seal arrangement (10): - a sealing body (11) that can be driven to rotate about an axis of rotation (D) and which has a sealing surface (14) on a first axial side (15) that is designed to slide against a contact surface (40) when the sealing body (11) rotates about the axis of rotation (D), wherein the sealing body (11) is monolithic and made of plastic material, - several permanent magnetic or magnetizable retaining elements (30) arranged on the sealing body (11), - at least one permanent magnetic or magnetizable counter-holding body (39), - several retaining recesses (31) arranged circumferentially (U) around the axis of rotation (D) at intervals from each other in the sealing body (11), wherein each retaining recess (31) has a mounting opening (33) on a second axial side (32) of the sealing body (11) facing away from the first axial side (15), through which one of the retaining bodies (30) can be inserted into the retaining recess (31) in an axial direction (A) parallel to the axis of rotation (D) and / or removed from the retaining recess, wherein each retaining recess (31) is bounded by a recess wall (34) of the sealing body (11) following the mounting opening (33), so that a retaining body (30) inserted into an associated retaining recess (31) is held radially to the axis of rotation (D) by means of the recess wall. [2] Sliding ring seal arrangement according to claim 1, wherein each retaining recess (31) is closed towards the first axial side (15) in such a way that the retaining body (30) inserted is held in the retaining recess (31) in the axial direction (A) towards the first axial side (15). [3] Sliding ring seal arrangement according to claim 1 or 2, wherein each retaining element (30) inserted into an associated retaining recess (31) is held exclusively by positive locking in the radial direction (R). [4] Mechanical seal arrangement according to one of the preceding claims, wherein the sealing body (11) has a sealing part (12) with the sealing surface (14) and a retaining part (13) with the retaining recesses (31) which have a greater distance to the axis of rotation (D) than the sealing surface (14). [5] Sliding ring seal arrangement according to claim 4, wherein the sealing surface (14) is arranged on the first axial side (15) of the sealing body (11) in the axial direction (A) at a distance from an end face (16) of the retaining part (13). [6] Sliding ring seal arrangement according to one of the preceding claims, wherein the counter-holding body (39) is arranged to be stationary about the axis of rotation (D), wherein a total magnetic force (F) is generated in an axial direction (A) parallel to the axis of rotation (D) between the holding bodies (30) and the at least one counter-holding body (39). [7] Mechanical seal arrangement according to claim 6, wherein the total magnetic force (F) between the retaining bodies (30) and the at least one counter-retaining body (39) is such that a relative movement in the axial direction (A) between the sealing body and the at least one counter-retaining body (39) is prevented during the intended use of the mechanical seal arrangement (10). [8] Mechanical seal arrangement according to claim 6 or 7, wherein the at least one counter-holding body (39) is part of a counter-holding ring or the at least one counter-holding body (39) is a permanent magnetic or magnetizable counter-holding ring. [9] Mechanical seal arrangement according to one of the preceding claims, comprising a rotating component (20) rotatably driven about the axis of rotation (D), on which the sealing body (11) is arranged immovably in the circumferential direction (U) about the axis of rotation (D) relative to the rotating component (20). [10] Sliding ring seal arrangement according to claim 9, wherein the sealing body (11) is arranged to be movable or displaceable in the axial direction (A) relative to the rotating component (20) on the rotating component (20). [11] Sliding ring seal arrangement according to claim 10, wherein a slotted hole or an axial groove is provided in the rotating component (20) into which a radial projection (42) of the sealing body (11) engages. [12] Sliding ring seal arrangement according to one of the preceding claims, wherein at least in an unused initial state of the sealing body (11) there is an axial distance (x) between the sealing body (11) and the at least one counter-holding body (39). [13] Mechanical seal arrangement according to claim 12 and according to one of claims 10 or 11, wherein a sensor device is provided and is configured to monitor the axial distance (x). [14] Mechanical seal arrangement according to one of the preceding claims, wherein the sealing body (11) has a through opening (24) extending along the axis of rotation (D) and at least one sealing ring (26) arranged in the through opening (24) and coaxial to the axis of rotation (D). [15] Sliding ring seal arrangement according to claim 14 and according to one of claims 11 to 13, wherein the radial projection (42) extends in the radial direction (R) into the through opening (24). [16] Mechanical seal arrangement according to claim 14 or 15, wherein the sealing surface (14) is aligned perpendicular to the axis of rotation (D). [17] Mechanical seal arrangement according to one of the preceding claims, wherein the sealing body (11) consists of polytetrafluoroethylene (PTFE).

Images