Electric appliance
The integration of a vibration damping system with shielding plates and intermediate plates, using mechanical fastening and damping materials, addresses the noise issue caused by magnetic shunts in electric appliances, achieving reduced noise and loss through efficient vibration mitigation.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HITACHI ENERGY LTD
- Filing Date
- 2025-12-05
- Publication Date
- 2026-06-11
AI Technical Summary
Magnetic shunts mounted to the inner walls of electric appliance tanks cause vibrations leading to noise, which conventional solutions fail to adequately address.
A vibration damping system is integrated into the electric appliance, comprising a shielding plate with an intermediate plate and mechanical fastening connections, utilizing damping materials and mechanical spring elements to mitigate vibration transfer.
Significantly reduces noise during operation by effectively damping vibrations, thereby minimizing tank wall vibrations and thermal hotspots while reducing losses and eddy currents.
Smart Images
Figure EP2025085665_11062026_PF_FP_ABST
Abstract
Description
[0001] P2024, 0670 WO N / P240068W001 December 5, 2025
[0002] Description
[0003] Electric appliance
[0004] The present disclosure relates to an electric appliance.
[0005] In electric appliances such as power transformers used in energy distribution networks, losses caused by the tank walls can be reduced by means of magnetic shunts mounted to the inner walls of the tank. However, the magnetic shunts may cause vibrations of the tank wall, resulting in noise.
[0006] Embodiments of the disclosure relate to a way to dampen noise during operation of an electric appliance.
[0007] According to an embodiment of the electric appliance, the electric appliance comprises a tank and a shielding plate mounted to an inner wall of the tank wherein the electric appliance comprises a vibration damping system configured to dampen a transfer of vibrations from the shielding plate to the tank. In particular, the electric appliance further comprises an intermediate plate arranged between the shielding plate and the inner wall of the tank, wherein a plurality of shielding plates is mounted to the intermediate plate and wherein the intermediate plate is mounted to the inner wall of the tank by a mechanical fastening connection comprising a mechanical spring element.
[0008] Compared to conventional solutions, the vibration damping system may significantly reduce noise during operation of the electric appliance as the vibrations of the tank can be mitigated. P2024, 0670 WO N / P240068W001 December 5, 2025
[0009] For example, the electric appliance comprises a power device immersed in a liquid such as oil. Thus, the tank receives the power device and the liquid.
[0010] In the context of the present disclosure the term "inner wall of the tank" refers to that side of the tank that faces the power device. For example, the inner wall is in direct contact with the liquid.
[0011] For example, the electric appliance includes at least one of: a transformer, a phase shifter, a reactor, an inductor.
[0012] For example, the electric appliance is configured for use in a power distribution network.
[0013] By means of the shielding plate, losses of the electric appliance can be reduced. In particular, the shielding plate may mitigate losses caused by eddy currents in the tank wall. Further, the appearance of local thermal hotspots on the tank wall may be avoided. Thus a highly efficient and low-noise electric appliance can be achieved by the combination of the shielding plate and the vibration damping system.
[0014] The tank may comprise reinforcement bars to mechanically stabilize the tank. The number of reinforcement bars may vary from 2 to 50 reinforcement bars per sidewall of the tank. The tank may comprise horizontal reinforcement bars, vertical reinforcement bars, oblique reinforcement bars or combinations thereof.
[0015] For example, a thickness of the shielding plate is in a range from 5 mm to 100 mm. If more than one shielding plate is present, the shielding plates may differ from one another P2024, 0670 WO N / P240068W001 December 5, 2025
[0016] 3
[0017] with respect to the thickness. For example, shielding plates located closer to the middle of the respective wall of the tank may be thicker than shielding plates arranged closer to the corners of the tank.
[0018] For example, a thickness of the shielding plate is 10 mm or 20 mm or 50 mm or 100 mm.
[0019] A width of the shielding plate may be in a range from 100 mm to 15000 mm. For example, a width of the shielding plate is 100 mm, 200 mm or 500 mm or 1000 mm.
[0020] A height of the shielding plate may be in a range f rom 100 mm to 10000 mm. For example, a height of the shielding plate is 100 mm or 200 mm or 500 mm or 1000 mm.
[0021] The terms "height" and "width" refer to two directions within the main extension plane that are perpendicular to one another. The terms do not necessarily imply a limitation with respect to the orientation of the shielding plate in space when mounted to the inner wall of the tank.
[0022] Further, the width and / or the height may vary between the shielding plates of the electric appliance.
[0023] The shielding plate may be configured such that it dampens a specific acoustic frequency band of a particular electric appliance. For example, the shielding plate is configured to dampen vibrations during a loading stage. In particular, the vibration modes may be changed in a targeted manner by means of a frequency tuning element of the shielding plate so that the shielding plate has the highest noise reduction in a predetermined frequency range. Thus, during its production, P2024, 0670 WO N / P240068W001 December 5, 2025
[0024] 4
[0025] the shielding plate may be specifically adapted by means of the frequency tuning element to efficiently dampen noise in a frequency band where the noise emission of the electric appliance during operation is particularly high. For example, typical dominant noise frequencies are around 100 Hz, 120 Hz, 300 Hz, or 400 Hz.
[0026] Further, the reduction of vibrations may be achieved by appropriately selecting the vibration damping system and / or by combining different vibration damping systems within the electric appliance.
[0027] The electric appliance may comprise a single shielding plate or a plurality of shielding plates. For example, up to 30 shielding plates may be mounted to a single wall of the tank. For example, the shielding plates may be mounted horizontally, vertically or diagonally to one or more of the inner walls of the tank. The orientations of the individual shielding plates may also differ from one another.
[0028] The number of connection points at the inner wall of the tank for mounting the shielding plate may be in a range from 2 to 500.
[0029] According to a further embodiment of the electric appliance, the shielding plate is mounted to the inner wall of the tank by means of a welding connection. Thus, a permanent j oint is formed between the inner wall of the tank and the shielding plate. The welding connection may comprise a line or point pattern. The transfer of vibrations from the shielding plate to the tank may be further reduced by appropriately selecting the number of welding connections and the positions thereof. P2024, 0670 WO N / P240068W001 December 5, 2025
[0030] According to a further embodiment of the electric appliance, the shielding plate is mounted to the inner wall of the tank by means of a mechanical fastening connection. In particular, the mechanical fastening connection may be used to create a non-permanent j oint. For example, the mechanical fastening connection comprises a fastener such as a threaded fastener like a screw, a nut, a bolt, or combinations thereof.
[0031] Compared to welding connections, a mechanical fastening connection may help to further reduce the transfer of vibrations from the shielding plate to the tank.
[0032] According to a further embodiment of the electric appliance, the vibration damping system comprises a damping material arranged between the shielding plate and the inner wall of the tank.
[0033] For example, the damping material may comprise at least one of the following materials: cork rubber, rubber, cork, fabric glass.
[0034] For example, the damping material may be provided as a pad or a stripe or a mat.
[0035] For example, the damping material is arranged between the shielding plate and the tank. For example, the damping material may be arranged such that it overlaps with one or more reinforcement bars of the tank.
[0036] According to a further embodiment of the electric appliance, the vibration damping system comprises a mechanical spring element. P2024, 0670 WO N / P240068W001 December 5, 2025
[0037] For example, the mechanical spring element may comprise a spring washer or a combination of spring washers.
[0038] Alternatively or in addition, the spring element may be formed by another component of the electric appliance.
[0039] According to a further embodiment of the electric appliance, the mechanical spring element is a part of the mechanical fastening connection. For example, the mechanical spring element extends around a threading of a component of the mechanical fastening connection. A mechanical fastening connection comprising a mechanical spring element may provide a mechanical connection between two components with a reduced transfer of vibrations.
[0040] According to a further embodiment of the electric appliance, the electric appliance comprises a further vibration damping system. The further vibration damping system may be one of the damping systems described above in connection with the vibration damping system. The vibration damping system and the further vibration damping system may also be different types of vibration damping systems. For example, the vibration damping system comprises a damping material and the further vibration damping system comprises a mechanical spring element or vice versa.
[0041] Further, the vibration damping system and the further vibration damping system may be provided on or between different components of the electric appliance.
[0042] According to a further embodiment of the electric appliance, the electric appliance comprises an intermediate plate arranged between the shielding plate and the inner wall of P2024, 0670 WO N / P240068W001 December 5, 2025
[0043] the tank. For example, one or more shielding plates are mounted to the intermediate plate and the intermediate plate is mounted to the inner wall of the tank. Thus, the mechanical connection between the shielding plate and the inner wall of the tank is obtained via the intermediate plate.
[0044] For example, the intermediate plate comprises aluminum, copper, steel or a combination thereof.
[0045] For example, the intermediate plate has a thickness in a range from 5 mm to 50 mm.
[0046] For example, the intermediate plate has a width in a range from 100 mm to 15000 mm. For example, a width of the intermediate plate is 100 mm, 200 mm, 500 mm or 1000 mm.
[0047] For example, the intermediate plate has a height in a range from 100 mm to 10000 mm. For example, a height of the intermediate plate is 100 mm, 200 mm, 500 mm or 1000 mm.
[0048] According to a further embodiment of the electric appliance, a plurality of shielding plates is mounted to the intermediate plate. The intermediate plate may help to reduce the number of connection points at the inner wall of the tank. This helps to further reduce the vibrations transferred to the tank.
[0049] According to a further embodiment of the electric appliance, the vibration damping system is provided between the shielding plate and the intermediate plate and the further damping system is provided between the intermediate plate and P2024, 0670 WO N / P240068W001 December 5, 2025
[0050] 8
[0051] the inner wall of the tank. This helps to further reduce the vibrations transferred from the shielding plate to the tank.
[0052] According to a further embodiment of the electric appliance, the mechanical spring element comprises spring washers arranged on both sides of the intermediate plate. This helps to reduce the vibrations transferred from the shielding plate via the intermediate plate to the tank.
[0053] According to a further embodiment of the electric appliance, the mechanical spring element is formed by a flexible portion of a plate of the electric appliance. For example, the plate is the shielding plate or the intermediate plate. In particular, the flexible portion may be formed in one piece with the remaining part of the plate such as the shielding plate or the intermediate plate. For example, cutouts are formed in the plate such as the shielding plate or the intermediate plate to define the flexible portion. In other words, the flexible portion may represent a reed such as a metal reed creating a spring effect in a direction perpendicular to a main extension plane of the plate such as the shielding plate or the intermediate plate.
[0054] According to a further embodiment of the electric appliance, the shielding plate is configured as a magnetic shunt comprising a magnetic material. A magnetic shunt may efficiently divert the magnetic flux away from the walls of the tank so that eddy currents within the walls of the tank can be avoided or at least significantly reduced.
[0055] For example, the magnetic shunt comprises carbon steel or electrical steel (also referred to as silicon steel ). P2024, 0670 WO N / P240068W001 December 5, 2025
[0056] 9
[0057] The magnetic shunt may further comprise non-magnetic material such as aluminum or copper.
[0058] According to a further embodiment of the electric appliance, the shielding plate is formed from a non-magnetic metallic material. For example, the shielding plate is formed from aluminum or copper or a combination thereof.
[0059] For example, the shielding plate covers the entire area of the wall of the tank or at least 80% or at least 90% thereof.
[0060] Good electrical conductors such as copper and aluminum can shield alternating magnetic fields, in particular due to large eddy currents within the shielding plate. This may result in an efficient shielding, even though the material of the shielding plate is non-magnetic.
[0061] Every feature described above in connection with one embodiment may be combined with other features described in connection with other embodiments unless they are contradictory.
[0062] The accompanying figures are included to provide a further understanding. In the figures, elements of the same structure and / or functionality may be referenced by the same reference signs. It is to be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
[0063] In the Figures: P2024, 0670 WO N / P240068W001 December 5, 2025
[0064] 10
[0065] Figures 1A to 1C show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 1A) and two associated sectional views in Figures 1B and 1C;
[0066] Figures 2A to 2C show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 2A) and two associated sectional views in Figures 2B and 2C;
[0067] Figures 3A to 3C show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 3A) and two associated sectional views in Figures 3B and 3C;
[0068] Figures 4A to 4C show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 4A) and two associated sectional views in Figures 4B and 4C;
[0069] Figures 5A to 5C show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 5A) and two associated sectional views in Figures 5B and 5C;
[0070] Figures 6A to 6F show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 6A) with two corresponding sectional views in Figures 6B and 6C, wherein Figures 6D to 6F show details of the electric appliance in sectional views;
[0071] Figures 7A to 7E show an exemplary embodiment of an electric appliance in a view onto an inner wall of the tank (Figure 7A) with corresponding sectional views in Figures 7B and 7C, wherein Figure 7D shows a detail of the electric appliance in a perspective view and Figure 7E shows a detail of the electric appliance in a cross-sectional view. P2024, 0670 WO N / P240068W001 December 5, 2025
[0072] While the disclosure is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the figures and will be described in detail. It should be understood, however, that the intention is not to limit the disclosure to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure defined by the appended claims.
[0073] The electric appliance illustrated in Figures 1A to 1C comprises a tank 2 and a plurality of shielding plates 3 mounted to an inner wall 21 of the tank. The electric appliance 1 comprises a vibration damping system 4 configured to dampen a transfer of vibrations from the shielding plate 3 to the tank 2.
[0074] As schematically illustrated in Fig. 1B, the inner wall 21 of the tank 2 faces a power device 15 arranged within the tank 2. For example, the power device 15 is immersed in a liquid such as oil. For example, the power device 15 is configured for use in an energy distribution network. For example, the power device 15 is a transformer.
[0075] In the exemplary embodiment shown, the vibration damping system 4 comprises a vibration damping material 41 arranged between the shielding plate 3 and the tank 2. As illustrated in Figure 1C, the shielding plate 3 may be mounted to the inner wall 21 of the tank 2 by means of a welding connection 59. For example, the welding connection 59 may have a line or point pattern.
[0076] For example, the damping material may comprise cork rubber, rubber, cork or fabric glass. P2024, 0670 WO N / P240068W001 December 5, 2025
[0077] - 12 -
[0078] The shielding plates may be configured as a magnetic shunt comprising a magnetic material such as electrical steel.
[0079] Alternatively, a non-magnetic material such as aluminum or copper may be used.
[0080] By means of the shielding plates 3, losses caused by eddy currents induced in the tank can be reduced. Further, thermal hotspots on the tank wall can be avoided.
[0081] By means of the vibration damping system 4, a transfer of vibrations of the shielding plates 3 to the tank 2 can be significantly reduced. This helps to reduce the noise during operation of the electric appliance 1.
[0082] The number of shielding plates 3, as well as their geometric dimensions and thicknesses, may vary in wide ranges depending on the configuration of the tank 2 of the electric appliance 1.
[0083] For example, a thickness of the shielding plates 3 is in a range from 5 mm to 100 mm. The shielding plates 3 may differ from one another with respect to the thickness. For example, shielding plates 3 located closer to the middle of the respective wall of the tank may be thicker than shielding plates 3 arranged closer to the corners of the tank 2.
[0084] For example, a thickness of the shielding plate 3 is 10 mm or 20 mm or 50 mm or 100 mm.
[0085] A width of the shielding plate 3 may be in a range from 100 mm to 15000 mm. For example, a width of the shielding plate 3 is 100 mm, 200 mm or 500 mm or 1000 mm. P2024, 0670 WO N / P240068W001 December 5, 2025
[0086] 13
[0087] A height of the shielding plate 3 may be in a range from 100 mm to 10000 mm. For example, a height of the shielding plate 3 is 100 mm or 200 mm or 500 mm or 1000 mm.
[0088] The exemplary embodiment of Figures 2A to 2C substantially corresponds to the exemplary embodiment described in connection with Figures 1A to 1C.
[0089] In departure therefrom, the shielding plates 3 are mounted to the tank 2 by means of a mechanical fastening connection 5. For example, the mechanical fastening connection 5 comprises a threaded fastener such as a screw or a nut or a bolt.
[0090] Compared to a welding connection, the transfer of vibrations can be further reduced. Further, the degree of compression of the damping material 41 can be appropriately adapted by means of the mechanical fastening connection 5.
[0091] The exemplary embodiment illustrated in Figures 3A to 3C substantially corresponds to the exemplary embodiment of Figures 2A to 2C.
[0092] In departure therefrom, the mechanical fastening connection 5 comprises a further vibration damping system 45 configured as a mechanical spring element 42 such as a spring washer.
[0093] Consequently two different types of vibration damping systems 4 are combined to further reduce the vibrations transferred to the tank 2.
[0094] The exemplary embodiment of Figures 4A to 4C substantially corresponds to the exemplary embodiment described in connection with Figures 2A to 2C. P2024, 0670 WO N / P240068W001 December 5, 2025
[0095] - 14 -
[0096] In departure therefrom, the electric appliance 1 comprises an intermediate plate 6 arranged between the shielding plates 3 and the inner wall 21 of the tank 2. Thus, the shielding plates 3 are mounted to the inner wall 21 of the tank 2 via the intermediate plate 6. The shielding plates 3 are mounted to the intermediate plate 6 by means of a mechanical fastening connection 5. The intermediate plate 6 is mounted to the inner wall 21 of the tank 2 by means of a further mechanical fastening connection 55.
[0097] A vibration damping material 41 may be arranged between the shielding plates 3 and the intermediate plate 6 and / or between the intermediate plate 6 and the inner wall 21 of the tank 2.
[0098] Alternatively or in addition, the mechanical fastening connection 5 and / or the further mechanical fastening connection 55 may comprise a mechanical spring element 42 such as one or more spring washers as described in connection with Figures 3A to 3C.
[0099] Several shielding plates 3 may be mounted to a single intermediate plate 6. This helps to reduce the number of mechanical contact points at the inner wall 21 of the tank 2. The transfer of the vibrations from the shielding plates 3 to the tank 2 may be mitigated.
[0100] The exemplary embodiment of Figures 5A to 5C substantially corresponds to the exemplary embodiment described in connection with Figures 2A to 2C. P2024, 0670 WO N / P240068W001 December 5, 2025
[0101] 15
[0102] In departure therefrom, the shielding plate 3 is formed from a non-magnetic metal having a high electric conductivity such as copper or aluminum.
[0103] The mechanical fastening connection 5 and the damping material 41 can be configured as described in connection with Figures 2A to 2C.
[0104] For example, a damping material such as fabric glass arranged between the shielding plate 3 and the inner wall 21 of the tank 2 may act as dielectric insulation.
[0105] Additionally, mechanical spring elements 42 such as spring washers may be used as described in connection with Figures 3A to 3C in this exemplary embodiment as well.
[0106] The exemplary embodiment illustrated in Figures 6A to 6F substantially corresponds to the exemplary embodiment described in connection with Figures 4A to 4C.
[0107] In departure therefrom, the electric appliance 1 does not necessarily require a damping material 41. However, such damping materials may be additionally provided.
[0108] As illustrated in the sectional view of Figure 6D, the vibration damping system 4 is formed by a mechanical spring element 42 that is used in the further mechanical fastening connection 55 between the intermediate plate 6 and the inner wall 21 of the tank 2.
[0109] A further mechanical spring element 42 is used for the mechanical fastening connection 5 between the shielding plate 3 and the intermediate plate 6. P2024, 0670 WO N / P240068W001 December 5, 2025
[0110] - 16 -
[0111] As illustrated in Figures 6E and 6F, the degree of compression of the mechanical spring element 42 can be appropriately tuned via the further mechanical fastening connection 55 to further reduce the transfer of vibrations from the shielding plate 3 to the tank 2.
[0112] The further mechanical fastening connection 55 may optionally comprise a tubular damping material 53 to reduce vibrations between the mechanical spring element 42 and components of the further mechanical fastening connection 55 such as bolts or screws.
[0113] For example, the mechanical spring element 42 may comprise a plurality of stacked spring washers. In particular, mechanical spring elements 42 such as spring washers may be arranged on both sides of the intermediate plate 6.
[0114] The exemplary embodiment of Figures 7A to 7E substantially corresponds to the exemplary embodiment described in connection with Figures 6A to 6F.
[0115] In departure therefrom, the vibration damping system 4 is configured as a flexible portion 43 of a plate 65. In the exemplary embodiment shown, the plate 65 is the intermediate plate 6.
[0116] As illustrated in Figure 7D, the plate 65 comprises cutouts 44 defining a reed formed in one piece with the remaining plate 65. As an arrow 7 illustrates, the reed provides flexibility in a direction perpendicular to a main extension plane of the plate 6. P2024, 0670 WO N / P240068W001 December 5, 2025
[0117] 17
[0118] The resulting spring effect provided by the flexible portions 43 may reduce the vibrations transferred to the wall of the tank 2.
[0119] The further mechanical fastening connection 55 extends through the flexible portion 43. For example, the further mechanical fastening connection 55 comprises a nut 56 welded to the tank 2 together with a bolt 58 and a washer 57.
[0120] Instead of a washer 57, a spring washer may be used to further reduce the vibrations.
[0121] As illustrated in Figure 7E, a further mechanical spring element 42 may be provided for the mechanical fastening connection 5 between the shielding plate 3 and the intermediate plate 6.
[0122] However, flexible portions 43 may also be used in other plates, so that the flexible portions may also be provided in embodiments that do not comprise an intermediate plate 6. For example, the flexible portion 43 may also be formed in the shielding plate 3 of the exemplary embodiment described in connection with Figures 5A and 5C.
[0123] In all of the above exemplary embodiments one or more vibration damping systems, in particular different types of vibration damping systems, may be combined in a single electric appliance 1 to reduce the transfer of vibrations from the shielding plates to the tank.
[0124] The embodiments shown in the Figures 1A to 7E as stated represent exemplary embodiments of the improved electric appliance; therefore, they do not constitute a complete list of all embodiments according to the improved electric P2024, 0670 WO N / P240068W001 December 5, 2025
[0125] - 18 -
[0126] appliance. Actual configurations may vary from the embodiments shown in terms of arrangements, devices, dimensions, or materials, for example. P2024, 0670 WO N / P240068W001 December 5, 2025
[0127] 19
[0128] Reference Signs
[0129] 1 electric appliance
[0130] 15 power device
[0131] 2 tank
[0132] 21 inner wall
[0133] 3 shielding plate
[0134] 4 vibration damping system
[0135] 41 vibration damping material
[0136] 42 mechanical spring element
[0137] 43 flexible portion
[0138] 44 cutout
[0139] 45 further vibration damping system
[0140] 5 mechanical fastening connection
[0141] 53 tubular damping material
[0142] 55 further mechanical fastening connection 56 nut
[0143] 57 washer
[0144] 58 bolt
[0145] 59 welding
[0146] 6 intermediate plate
[0147] 65 plate
[0148] 7 arrow
Claims
P2024, 0670 WO N / P240068W001 December 5, 2025- 20 -Claims1. An electric appliance (1) comprising a tank (2) and a shielding plate (2) mounted to an inner wall (21) of the tank (2 ), wherein- the electric appliance (1) comprises a vibration damping system (4) configured to dampen a transfer of vibrations from the shielding plate to the tank;- the electric appliance (1) comprises an intermediate plate (6) arranged between the shielding plate (2) and the inner wall (21) of the tank (2);- a plurality of shielding plates (2) is mounted to the intermediate plate (6) by means of a mechanical fastening connection (5); and- the intermediate plate (6) is mounted to the inner wall (21) of the tank (2) by a further mechanical fastening connection (55) comprising a mechanical spring element (42).
2. The electric appliance according to claim 1,wherein the vibration damping system (4) comprises a damping material (41) arranged between the shielding plate (2) and the inner wall (21) of the tank (2).
3. The electric appliance according to any one of the preceding claims,wherein the vibration damping system (4) comprises the mechanical spring element (42).
4. The electric appliance according to claim 3,wherein the mechanical spring element (42) is a part of the further mechanical fastening connection (55).P2024, 0670 WO N / P240068WO01 December 5, 2025215. The electric appliance according to any one of the preceding claims,wherein the mechanical spring element (42) comprises spring washers arranged on both sides of the intermediate plate (6).
6. The electric appliance according to any one of the preceding claims,wherein the mechanical spring element is formed by a flexible portion (43 ) of the intermediate plate (6).
7. The electric appliance according to claim 6,wherein the flexible portion (43 ) of the intermediate plate (6) is formed by cutouts (44) in the intermediate plate (5) representing a reed creating a spring effect.
8. The electric appliance according to any one of the preceding claims,wherein the electric appliance (1) comprises a further vibration damping system (45).
9. The electric appliance according to claim 8,wherein the vibration damping system (4) is provided between the shielding plate (2) and the intermediate plate (6) and wherein the further damping system (45) is provided between the intermediate plate (6) and the inner wall (21) of the tank (2 ).
10. The electric appliance according to any one of the preceding claims,wherein the shielding plate is configured as a magnetic shunt comprising a magnetic material.P2024, 0670 WO N / P240068WO01 December 5, 202522 -11. The electric appliance according to any one of claims 1 to 9,wherein the shielding plate is formed from a non-magnetic metallic material.