Cartridge seal cartridge and submersible motor pump
By designing a cylindrical sealing box, the lower sliding ring seal, the upper sliding ring seal, and the mating stationary ring are integrated into a replaceable component, solving the problems of difficult replacement of seals and low efficiency of cooling circuit in submersible motors, and achieving a shorter shaft, more efficient cooling, and a more robust structure.
Patent Information
- Application Number
- CN202422723305.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-14
- Filing Date
- 2024-11-08
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-08
AI Technical Summary
The existing submersible motors have difficult-to-replace sliding ring seals, and their design leads to shaft bending and wear. They also have low cooling circuit efficiency and a risk of fiber blockage.
Design a cylindrical sealing box comprising a lower sliding ring seal, an upper sliding ring seal, and a mating stationary ring, integrated into a functional component that is replaceable as a whole, reducing axial extension, lowering wear, and achieving effective coolant circulation through an impeller on the mating stationary ring.
It enables convenient replacement of seals, reduces shaft bending wear, improves sealing and cooling efficiency, reduces the risk of fiber blockage, and enhances structural robustness.
Smart Images
Figure CN223622213U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a cylindrical seal box for a submersible electric motor with an axial shaft for a pump and a submersible electric motor pump. The cylindrical seal box includes a lower sliding ring seal, an upper sliding ring seal, and a mating stationary ring axially disposed between the upper and lower sliding ring seals and supported on the shaft in a non-rotatable manner. Background Technology
[0002] In particular, the dry-mounted submersible motor of the wastewater pump has an internal cooling circuit that transfers heat from the stator of the submersible motor to the heat exchanger flange. The heat exchanger flange is in contact with the wastewater and transfers the heat dissipated in this way to the wastewater to cool it.
[0003] Such submersible motors, as known from the prior art, typically include a first sliding ring seal for separating wastewater from water and / or ethylene glycol in the internal cooling circuit; a second sliding ring seal for separating the internal cooling circuit from air present in the motor housing of the submersible motor; and a mating stationary ring disposed between the first and second sliding ring seals.
[0004] However, the problem with this design is that it is generally not possible to replace the sliding ring seal and mating stationary ring due to wear without disassembling the submersible motor, which means significant costs. The cooling circuit in known designs also needs improvement. Furthermore, these designs are typically axially elongated, leading to considerable bending and corresponding wear on the submersible motor shaft. Utility Model Content
[0005] Based on this situation, the purpose of this utility model is to improve a seal for a submersible electric motor with an axial shaft used in pumps, especially wastewater pumps.
[0006] The objective of this invention is achieved through the features of a cylindrical sealing box. Advantageous design solutions are provided in the specific embodiments.
[0007] Accordingly, this objective is achieved by a cylindrical seal for a submersible electric motor with an axial shaft for a pump, the seal comprising:
[0008] The lower sliding ring seal is configured to separate wastewater from the coolant in the cooling circuit of the submersible motor, which transfers heat from the stator of the submersible motor to the heat exchanger flange.
[0009] An upper sliding ring seal, configured to separate the cooling circuit from air present in the motor housing of the submersible electric motor; and
[0010] A fixed, axially positioned stationary ring between the upper and lower sliding ring seals, and supported on the shaft to prevent rotation.
[0011] The stationary ring has an impeller configured to circulate the coolant.
[0012] The fundamental aspect of the proposed solution lies in the integration of the lower sliding ring seal, upper sliding ring seal, and mating stationary ring as functional components into a cylindrical seal housing. This allows for simple replacement as a single unit, particularly without disassembling the submersible motor. By providing these functional components as a cylindrical seal housing, a more compact structure is achieved, resulting in a shorter shaft end, i.e., a smaller axial extension range, and thus less shaft bending, thereby reducing impeller wear and improving sealing performance. Finally, the proposed solution is more robust and durable than known prior art designs, especially for pre-assembled and tested units, thereby reducing the risk of fiber clogging around the lower and / or upper sliding ring seals. Finally, the integrated impeller allows for more efficient circulation of coolant in the cooling circuit, resulting in better cooling of the submersible motor.
[0013] Within the scope of this invention, the term "cylindrical" is particularly used to refer functionally to a container for replaceable insertion into a submersible motor. Within the scope of this invention, the term "box" is also particularly understood to mean box-shaped, modular, and / or compact. This specifically means that the box can be inserted into the submersible motor as a unit and can be removed from the submersible motor again. Within the scope of this invention, the terms "axial" or "radial" specifically refer to a shaft, i.e., its axial or radial extension.
[0014] A pump typically refers to a turbine that uses rotational motion and power to primarily transport liquids as fluids. In addition to the tangential acceleration of the fluid (also called the medium), centrifugal force generated in radial flow is also used for transport, thus the pump is also called a circulating pump or centrifugal pump. The fluid preferably includes water or other liquid media, such as wastewater. The pump can be designed as a wastewater pump, where alternative designs as heating pumps or perforating pumps are conceivable in principle. The pump can also be designed as a multistage pump for increasing pressure or a so-called vertical turbine pump. The pump may have a pump impeller disposed within a pump housing, allowing it to be driven by a submersible electric motor that can be arranged in an electric motor housing. A shaft connects the submersible electric motor to the pump impeller. Within the scope of this invention, a submersible electric motor is particularly understood to be an electric motor designed and / or specified for operation completely immersed in a liquid (e.g., wastewater).
[0015] In an axial top view, the lower sliding ring seal, the upper sliding ring seal, and / or the mating stationary ring preferably have an annular shape, having at least a circular inner cross-section and preferably also a circular outer cross-section. Preferably, the inner diameter of the mating stationary ring is smaller than the inner diameter of the lower sliding ring seal and / or the upper sliding ring seal. The lower sliding ring seal and the upper sliding ring seal may have the same inner diameter and / or be symmetrically designed. More preferably, the lower sliding ring seal, the upper sliding ring seal, and / or the mating stationary ring have a rectangular shape in radial cross-section.
[0016] The coolant may include water and / or ethylene glycol. The impeller preferably has multiple impeller blades for circulating the coolant. The mating stationary ring preferably contacts and abuts the shaft, while the lower sliding ring seal and / or upper sliding ring seal are spaced apart from the shaft by their inner sides. The shaft is preferably anti-rotatably connected to the submersible motor. The impeller is preferably anti-rotatably connected to the mating stationary ring. The impeller preferably has an opening into which the mating stationary ring is inserted, i.e., the impeller preferably radially surrounds and engages the mating stationary ring. The lower sliding ring seal and the mating stationary ring and / or the upper sliding ring seal and the mating stationary ring are preferably in axial contact, rotatable relative to each other, and / or fluid-tightly abutting each other.
[0017] Preferably, the sealing box can be inserted into the submersible motor with its upper sliding ring seal. The submersible motor is preferably arranged in a motor housing, which further preferably extends toward the upper sliding ring seal when the sealing box is inserted into the submersible motor. The mating stationary ring is preferably mounted on the shaft in a rotation-resistant manner.
[0018] According to a preferred embodiment, the sealing box has a base, wherein a lower sliding ring seal, an upper sliding ring seal, and a mating stationary ring are arranged inside the base. Preferably, the aforementioned components are held internally and by the base, thereby allowing the sealing box to be easily inserted into and removed from a submersible motor as a compact component. The base, lower sliding ring seal, mating stationary ring, upper sliding ring seal, and / or impeller are preferably made of metal and / or hard plastic. Preferably, the base protrudes radially beyond the lower sliding ring seal, mating stationary ring, upper sliding ring seal, and / or impeller, while the base does not protrude axially beyond the upper sliding ring seal. The base may have an inner flange at its end facing the lower sliding ring seal, which engages radially and does not protrude axially beyond the lower sliding ring seal. Furthermore, the base may have an outer flange that protrudes axially beyond the inner flange.
[0019] According to another preferred design, the sealing box has an upper spring element and / or a lower spring element, wherein the upper spring element is arranged between the base and the upper sliding ring seal to apply an upper, axially acting elastic force to the upper sliding ring seal, and / or the lower spring element is arranged between the base and the lower sliding ring seal to apply a lower, axially acting elastic force to the lower sliding ring seal. The upper and / or lower sliding ring seals preferably have radially outwardly extending flanges on which the ends of the upper and / or lower spring elements are supported. The opposite ends of the upper and / or lower spring elements are preferably supported on the base.
[0020] Preferably, an axially extending notch is provided in the base, in which the other end of the upper spring element and / or lower spring element is held. More preferably, the base has a radially engaging flange, such that the axial movement of the upper sliding ring seal and / or lower sliding ring seal is restricted by the base. The upper sliding ring seal, the mating stationary ring, and the lower sliding ring seal are axially and fluidly sealed and / or centered relative to each other, particularly axially, within the base by the upper spring element and / or lower spring element. Preferably, a plurality of upper or lower spring elements are provided, which are arranged around the upper or lower sliding ring seal at regular intervals.
[0021] According to another preferred embodiment, the sealing box is provided with an upper seal and / or a lower seal, wherein the upper seal is radially arranged between the base and the upper sliding ring seal, and / or the lower seal is radially arranged between the base and the lower sliding ring seal. The upper and / or lower seals are preferably inserted into radially inwardly extending grooves in the base. The upper and / or lower seals are preferably implemented as O-rings or have a rectangular radial cross-section.
[0022] According to another preferred design, the sealing box has an upper anti-torsion member, particularly implemented in a pin configuration, that is axially guided through the base and the upper sliding ring seal, and / or a lower anti-torsion member, particularly implemented in a pin configuration, that is axially guided through the base and the lower sliding ring seal. Preferably, the anti-torsion member is fixedly held at one end in an axially extending recess and slides at its other opposite end in an axially extending opening within a flange. Preferably, a plurality of anti-torsion members are provided, arranged at regular intervals around the upper or lower sliding ring seal. The anti-torsion members secure the base against rotation relative to the upper and / or lower sliding ring seals.
[0023] According to another preferred design, the substrate is designed with openings on its radially opposite side from the upper and / or lower sliding ring seals to allow coolant circulation. For this purpose, multiple openings can be provided on the radially opposite side, through which coolant can pass through the impeller and be circulated accordingly.
[0024] According to another preferred design, the base has at least two rings and connecting members extending axially between these rings and holding them in a spaced-apart manner. Preferably, three rings are provided, each of which is radially arranged corresponding to the upper sliding ring seal, the mating stationary ring and the impeller, and the lower sliding ring seal. The base can be designed as a single piece, wherein it is also possible for one of the rings to be designed as a two-piece, such that the base is fitted onto the upper sliding ring seal, the mating stationary ring and the lower sliding ring seal in a divided manner, particularly axially, and in the fitted state, the two parts are connected to each other to form the base, particularly in a releasable manner. This connection can be made by means of screws or similar means. Preferably, a plurality of connecting members are provided, which are arranged at regular intervals.
[0025] According to another preferred improvement, the mating stationary ring has at least one, and particularly two, sealing bushings that are radially inserted into the mating stationary ring and supported on the shaft in a rotation-resistant manner. The sealing bushings are preferably inserted into radially outwardly extending, circumferential grooves on the inner side of the mating stationary ring. Preferably, the sealing bushings contact and abut against the shaft. More preferably, at least two sealing bushings are provided, which are axially spaced apart relative to each other.
[0026] According to another preferred design, the upper sliding ring seal and / or the lower sliding ring seal has an outer support ring facing the mating stationary ring, and / or the mating stationary ring has an inner support ring facing the upper sliding ring seal and / or the lower sliding ring seal. Particularly preferably, the mating stationary ring has two inner support rings disposed on opposite axial sides of the mating stationary ring. Preferably, the outer support ring and the inner support rings are abutted against each other in a contact and / or fluid-sealing manner. Particularly preferably, the axial sides of the upper sliding ring seal and / or the lower sliding ring seal facing the mating stationary ring, and / or the axial sides of the mating stationary ring facing the upper sliding ring seal and / or the lower sliding ring seal, engage in an axially extending groove into which the outer support ring and / or the inner support ring are inserted.
[0027] According to another preferred improvement, the outer support ring and / or inner support ring are made of silicon carbide. Silicon carbide (commonly known as diamond) is a compound of silicon and carbon, belonging to the carbon compound group. Silicon carbide ensures high sealing performance and good rotatability between the upper sliding ring seal and / or lower sliding ring seal and the mating stationary ring.
[0028] According to another preferred design, the outer support ring is axially inserted and / or retracted into the upper and / or lower sliding ring seals, and / or the inner support ring is axially inserted and / or retracted into the mating stationary ring. Thus, the outer and / or inner support rings adhere particularly well to the upper and / or lower sliding ring seals and / or the mating stationary ring.
[0029] According to another preferred design, the sealing box is provided with a fixing device extending radially through the mating stationary ring. This fixing device is configured to secure the impeller to the mating stationary ring in a positional manner. The fixing device is preferably designed as a screw, especially a headless hexagonal socket head cap screw, which can be screwed into the radially extending threads in the mating stationary ring to apply a radial force to the impeller to secure it.
[0030] The objective of this invention is also achieved by a submersible electric motor pump, which includes a sealing box, a shaft, and a submersible electric motor as described above, wherein an impeller is mounted on the shaft in an anti-rotation manner. The submersible electric motor pump preferably has an opening into which the sealing box can be inserted. The sealing box preferably has a circular outer cross-section, which narrows in diameter from the lower sliding ring seal toward the upper sliding ring seal. The opening preferably corresponds to the external shape of the sealing box. Attached Figure Description
[0031] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
[0032] In the attached diagram:
[0033] Figure 1 A schematic perspective side view of a partially cut-away cylindrical sealing box for a pump with an axial shaft, according to a preferred embodiment of the present invention, is shown.
[0034] Figure 2 A schematic side view of a partially cut-open cylindrical sealing box according to a preferred embodiment of the present invention.
[0035] Figure 3 A schematic cross-sectional view of the cylindrical sealing box according to a preferred embodiment of the present invention.
[0036] Figure 4 A schematic top view of the impeller of the cylindrical sealing box according to a preferred embodiment of the present invention, and
[0037] Figure 5 A schematic perspective side view of the cylindrical sealing box and its matching stationary ring according to a preferred embodiment of the present invention. Detailed Implementation
[0038] Figure 1A schematic perspective side view of a partially cut-away cylindrical sealing box 1 for a submersible motor 3 with an axial shaft 2 for a pump 4, according to a preferred embodiment of the present invention, is shown. Figure 2 The cylindrical sealing box 1 is shown schematically in a partially cut-out side view, and Figure 3 The cylindrical sealing box is shown in a schematic cross-sectional view.
[0039] like Figure 3 As shown, the cylindrical sealing box 1 has a lower sliding ring seal 5 and an upper sliding ring seal 6, which engage with the shaft 2 in a radially circumferential manner, but do not abut against the shaft 2. The lower sliding ring seal 5 separates wastewater from the coolant in the cooling circuit used to cool the submersible motor 3. By means of the cooling circuit, heat is transferred from the stator 7 (shown only approximate) of the submersible motor 3 to the heat exchanger flange 8 (shown only approximate). The upper sliding ring seal 6 separates the cooling circuit from the air present in the motor housing 9 (shown only approximate) of the submersible motor 3.
[0040] A mating stationary ring 10 is axially disposed between the lower sliding ring seal 5 and the upper sliding ring seal 6. The mating stationary ring 10 is mounted on the shaft 2 in a rotation-resistant manner. The lower sliding ring seal 5 and the upper sliding ring seal 6 are respectively axially contacting and abutting the mating stationary ring 10. The mating stationary ring 10 has an impeller 11 (as shown in the schematic top view). Figure 4 As shown, it is used to circulate coolant. The annular impeller 11 surrounds the mating stationary ring 10 in a radially encircling manner and is disposed on the mating stationary ring 10 in a contact and anti-rotation manner. A plurality of impeller blades 12 are provided on the impeller 11, oriented toward the submersible motor 3.
[0041] The sealing box 1 has a base 13, inside which a lower sliding ring seal 5, an upper sliding ring seal 6, a mating stationary ring 10, and an impeller 11 are arranged. The base 13 thus includes the lower sliding ring seal 5, the upper sliding ring seal 6, the mating stationary ring 10, and the impeller 11 in a radial direction. The base 13, the lower sliding ring seal 5, the upper sliding ring seal 6, the mating stationary ring 10, and / or the impeller 11 are made of metal and / or plastic (especially hard plastic).
[0042] Here, the base 13 is designed with three spaced-apart rings 14, which extend coaxially around the shaft 2 relative to the lower sliding ring seal 5, the upper sliding ring seal 6, the mating stationary ring 10, and the impeller 11. A plurality of spaced-apart, axially extending connectors 15 are provided between the rings 14. The base 13 is thus designed with openings on its radially opposite sides to the lower sliding ring seal 5 and the upper sliding ring seal 6, allowing coolant to circulate through these openings. The lower ring 14 radially surrounds and engages the lower sliding ring seal 5, the middle ring 14 radially surrounds and engages the mating stationary ring 10, and the upper ring 14 radially surrounds and engages the upper sliding ring seal 6. When the upper ring 14 is axially flush with the upper sliding ring seal 6, the lower ring 14 is also axially flush with the lower sliding ring seal 5 at its radially inner edge, but axially protrudes from the lower sliding ring seal 5 at its radially outer edge.
[0043] To fluid-tightly seal the lower sliding ring seal 5 and the upper sliding ring seal 6 relative to the mating stationary ring 10 inside the base 13, the sealing box 1 also has a lower spring element 16 and an upper spring element 17. The lower spring element 16 and the upper spring element 17 extend axially and are inserted into corresponding axial recesses in the base 13, such that the corresponding axially acting spring force is applied to the corresponding radially extending flanges of the lower sliding ring seal 5 and the upper sliding ring seal 6 away from the shaft 2.
[0044] Adjacent to the lower spring element 16 and the upper spring element 17, radially arranged corresponding rectangular cross-section seals are provided as lower seal 18 and upper seal 19 located between the corresponding ring 14 of the base 13 and the lower sliding ring seal 5 and the upper sliding ring seal 6. The lower seal 18 and upper seal 19 are inserted into the corresponding grooves of the lower sliding ring seal 5 and the upper sliding ring seal 6, which are radially introduced on the side of the lower sliding ring seal 5 and the upper sliding ring seal 6 away from the shaft 2.
[0045] To enable a rotationally fixed connection between the base 13 and the lower sliding ring seal 5 and the upper sliding ring seal 6, pin-implemented anti-torsion members 20, in the form of bolts, are provided. These anti-torsion members are axially inserted into corresponding axially extending recesses of the respective rings 14 through openings in radially extending flanges. The bolts are fixed in the recesses in a positional manner, but allow axial displacement of the lower sliding ring seal 5 and the upper sliding ring seal 6 relative to the base 13 or the corresponding rings 14.
[0046] As previously described, the impeller 11 is mounted on the shaft 2 in an anti-rotation manner. For this purpose, two rectangular sealing bushings 21 are provided on the mating stationary ring 10, which are inserted, spaced apart from each other, into radial recesses extending away from the shaft 2 of the mating stationary ring 10, thus contacting and abutting against the mating stationary ring 10 and the shaft 2, thereby fixing the mating stationary ring 10 or the impeller 11 to the shaft 2 in an anti-rotation manner. The inner diameter of the mating stationary ring 10 is smaller than the inner diameters of the lower sliding ring seal 5 and the upper sliding ring seal 6.
[0047] The lower sliding ring seal 5 and the mating stationary ring 10 have opposite, corresponding axial recesses (specifically for the lower sliding ring seal 5, in...). Figure 5 As shown in the diagram, the outer support ring 22 is axially retracted into the recess of the lower sliding ring seal 5, and correspondingly, the inner support ring 23 is axially retracted into the recess of the mating stationary ring 10. Similarly, the upper sliding ring seal 6 and the mating stationary ring 10 have other opposite, corresponding axial recesses, in which another outer support ring 22 is axially retracted and correspondingly, another inner support ring 23 is axially retracted. The corresponding pairs of outer support rings 22 and inner support rings 23 are made of silicon carbide and are respectively in axial contact with and abut against each other and with and abut against the corresponding sliding ring seals 5, 6 and the mating stationary ring 10.
[0048] In order to fix the impeller 11 to the mating stationary ring 10 in a fixed position, a fixing device 24 is provided that extends radially through the mating stationary ring 10. The device is in the form of a fixing screw, which fixes the impeller by being screwed into the thread in the mating stationary ring 10 between the sealing liner 21 and by its tip acting on the impeller 11.
[0049] The described embodiments are merely examples, and these examples can be modified and / or supplemented in various ways within the scope of the claims. Each feature used to describe one embodiment can be used independently or in combination with other features in any other embodiment. Each feature used to describe an embodiment of a certain category can also be applied accordingly to embodiments of another category.
[0050] List of reference numerals
[0051] Sealed box 1;
[0052] Axis 2;
[0053] Submersible electric motor 3;
[0054] Pump 4;
[0055] Lower sliding ring seal 5;
[0056] Upper sliding ring seal 6;
[0057] Stator 7;
[0058] Heat exchanger flange 8;
[0059] Motor housing 9;
[0060] Matching static ring 10;
[0061] Impeller 11;
[0062] Impeller blades 12;
[0063] Matrix 13;
[0064] Ring 14;
[0065] Connector 15;
[0066] Lower spring element 16;
[0067] Upper spring element 17;
[0068] Lower seal 18;
[0069] Upper seal 19;
[0070] Anti-torsion component 20;
[0071] Sealing liner 21;
[0072] Outer support ring 22;
[0073] Inner support ring 23;
[0074] Fixture 24.
Claims
1. A cylindrical sealing box (1) for a submersible electric motor (3) having an axial shaft (2) in a pump (4), comprising: The lower sliding ring seal (5) is configured to separate wastewater from the coolant in the cooling circuit of the submersible motor (3), which transfers heat from the stator (7) of the submersible motor (3) to the heat exchanger flange (8). An upper sliding ring seal (6) is configured to separate the cooling circuit from the air present in the motor housing (9) of the submersible motor (3); and A mating stationary ring (10) axially disposed between the lower sliding ring seal (5) and the upper sliding ring seal (6), and rotatably supported on the shaft (2), wherein... The mating stationary ring (10) has an impeller (11) configured to circulate the coolant.
2. The sealed box (1) according to claim 1, characterized in that... The sealing box (1) has a base (13), wherein the lower sliding ring seal (5), the upper sliding ring seal (6) and the mating stationary ring (10) are arranged inside the base (13).
3. The sealed box (1) according to claim 2, characterized in that... The sealing box (1) has an upper spring element (17) and / or a lower spring element (16), wherein the upper spring element (17) is arranged between the base (13) and the upper sliding ring seal (6) to apply an upper, axially acting elastic force to the upper sliding ring seal (6), and / or the lower spring element (16) is arranged between the base (13) and the lower sliding ring seal (5) to apply a lower, axially acting elastic force to the lower sliding ring seal (5).
4. The sealed box (1) according to claim 2 or 3, characterized in that... The sealing box (1) has an upper seal (19) and / or a lower seal (18), wherein the upper seal (19) is radially arranged between the base (13) and the upper sliding ring seal (6), and / or the lower seal (18) is radially arranged between the base (13) and the lower sliding ring seal (5).
5. The sealed box (1) according to claim 2 or 3, characterized in that... The sealing box (1) has an anti-torsion member (20) that is axially guided through the upper part of the base (13) and the upper sliding ring seal (6), and / or an anti-torsion member (20) that is axially guided through the lower part of the base (13) and the lower sliding ring seal (5).
6. The sealed box (1) according to claim 2 or 3, characterized in that... The base (13) is designed to have an opening on its radial side away from the upper sliding ring seal (6) and / or the lower sliding ring seal (5) for circulating the coolant.
7. The sealed box (1) according to claim 2 or 3, characterized in that... The base (13) has at least two rings (14) and connectors (15) extending axially between the rings (14) and holding the rings (14) in a spaced manner.
8. The sealed box (1) according to any one of claims 1 to 3, characterized in that... The mating stationary ring (10) has at least one sealing liner (21) which is radially inserted into the mating stationary ring (10) and is supported on the shaft (2) in a rotation-resistant manner.
9. The sealed box (1) according to any one of claims 1 to 3, characterized in that... The upper sliding ring seal (6) and / or the lower sliding ring seal (5) have an outer support ring (22) facing the mating stationary ring (10), and / or the mating stationary ring (10) has an inner support ring (23) facing the upper sliding ring seal (6) and / or the lower sliding ring seal (5).
10. The sealed box (1) according to claim 9, characterized in that... The outer support ring (22) and / or the inner support ring (23) are made of silicon carbide.
11. The sealed box (1) according to claim 9, characterized in that... The outer support ring (22) is axially inserted into and / or retracted into the upper sliding ring seal (6) and / or the lower sliding ring seal (5), and / or the inner support ring (23) is axially inserted into and / or retracted into the mating stationary ring (10).
12. The sealed box (1) according to any one of claims 1 to 3, characterized in that... The sealing box (1) has a fixing device (24) extending radially through the mating stationary ring (10), the fixing device being configured to fix the impeller (11) to the mating stationary ring (10) in a position-fixed manner.
13. A submersible electric motor pump (4) comprising a sealing box (1) according to any one of claims 1 to 12, the shaft (2) and the submersible electric motor (3), wherein the impeller (11) is mounted on the shaft (2) in a rotation-resistant manner.