ELECTRICAL APPLIANCE COMPRISING A BOILER HAVING A SHAPE COMPLEMENTARY TO THE ACTIVE PART

Abstract

An electrical appliance for connecting to a high voltage includes an active part, which is provided with a magnetizable core and at least two winding assemblies, each surrounding a core section of the core and having windings that are inductively coupled to one another. The active part is entirely arranged a tank, which can be filled with an insulating fluid. The tank has two end casings and a central part arranged between the end casings. The electrical appliance is compact and has a low tare weight. The central part forms a hollow body for each winding assembly, through which a respective one of the core sections extends, which is surrounded by an associated winding assembly. The hollow bodies are connected to one another on the inside and only via the internal volume of the end casings.

Claims

1-12. (canceled)

13. An electrical device for connection to a high voltage, the electrical device comprising: an active part having a magnetizable core and at least two winding assemblies, each surrounding a core section of said core and having windings that are inductively coupled to one another; and a tank to be filled with an insulating fluid and containing said active part completely; said tank having two end casings and a central part arranged between said end casings; said central part forming a hollow body for each winding assembly, with a respective one of said core sections, surrounded by an associated said winding assembly, extending through said hollow body; and said hollow bodies being connected to one another on an inside and only via an internal volume of said end casings.

14. The electrical device according to claim 13, wherein each hollow body is a circular-cylindrical tube section.

15. The electrical device according to claim 13, wherein said central part comprises two flat flange sections, between which said hollow bodies extend, wherein each said flange section is mechanically detachably connected to a respective flange section of one of said end casings, and wherein sealing means are disposed between said flange sections.

16. The electrical device according to claim 13, wherein said central part consists of a plastic.

17. The electrical device according to claim 13, wherein said central part is formed of a fiber-reinforced plastic.

18. The electrical device according to claim 13, wherein said end casings are formed of a metal or a metal alloy.

19. The electrical device according to claim 13, wherein said end casings are box-shaped.

20. The electrical device according to claim 13, wherein said end casings are formed to be complementary in shape relative to a section of said active part, opposite to which said end casings are located.

21. The electrical device according to claim 13, wherein at least one of said end casings is formed with at least one of a viewing window or a hand opening.

22. The electrical device according to claim 13, wherein said core has two core legs and an upper yoke and a lower yoke connecting said core legs to one another, and wherein each of said core legs extends through one of said hollow bodies and is surrounded by a respective said winding assembly.

23. The electrical device according to claim 13, wherein said active part is only mechanically connected to said tank at said end casings, and wherein said end casings are connected to fastening means for mounting on a rail vehicle.

24. The electrical device according to claim 23, wherein said end casings are each connected to a cross member of a supporting frame.

Description

[0035] FIG. 1 shows an exemplary embodiment of the electrical device according to the invention, which is designed as railway transformer 1. The railway transformer 1 has an externally visible housing 1, which comprises a central part 3, a rear end casing 4, and a front end casing 5. The central part 3 comprises two tube sections 6 and 7 as hollow bodies, which delimit a circular cylindrical inner cavity. Respectively one flange portion 8 and 9 is molded onto both front sides of the tube sections 6 and 7, which flange portion extends radially outward from the tube section at right angles to the longitudinal direction of the tube sections 6 and 7. In this case, each flange portion 8 and 9 is configured to be flat. In other words, the outer surface of the flange portions 8 and 9 each lie in a plane. Each end casing 4 and 5 has a corresponding flange portion 10 and 11, wherein the flange portion 10 of the rear end casing 4 lies opposite the flange portion 8 and the flange portion 11 of the front end casing 5 lies opposite the flange portion 9 of the central part 3. Through-holes can be identified in the flange portion 11 of the front end casing 5, in which screws can be disposed, which screws are screwed into holes of the flange portion 9 of the central part 3, which are open on one side. A corresponding fastening is provided for the flange portions 8 and 10, wherein, however, the through-holes are not shown as a result of the selected view.

[0036] Disposed between the flange portions 8, 19 or 9, 11 respectively is a circumferential O ring, which is inserted in a groove introduced in each case into the flange portions 8 and 9. By tightening screws not shown in the figures, the flange portions 9 and 11 or 8 and 10 respectively are pressed together, wherein the O ring inserted between them in the groove provides for a fluid-tight connection of these two components as a result of its elastic deformation.

[0037] The end casings 4 and 5 have a box-like structure and have a front wall 12 facing away from the respective flange portion 10 or 11 respectively, wherein a side wall 12 extends between the front wall 12 and the flange portion 11. At the corners the box-shaped structure is beveled in order to avoid unnecessary internal volume of the end casings 4 or 5, respectively. Furthermore, hand openings 14 can be identified, which are detachably fastened to the side wall 13 of the end casings 4 or 5, respectively. Furthermore, a high-voltage feedthrough 15 and cable outlets 16 can be seen in the anterior front wall.

[0038] L-shaped brackets 17 are used for mechanical reinforcement of the bottom region of the end casings 4 and 5 not shown in the figures, which brackets extend for the most part underneath the end casing 4 or 5 respectively and which are firmly connected to the respective end casing. The brackets are furthermore used to fasten the spacers to the inner side of the respective end casing. Furthermore the brackets and therefore the end casing can be connected more firmly by means of a fastening means.

[0039] An active part not shown in FIG. 1 is disposed in the tank or, in other words, the housing 2.

[0040] FIG. 2 shows the railway transfer 1 according to FIG. 1 from behind, wherein parts of the housing have been omitted to obtain a free view of the active part 18. The active part 18 comprises two winding assemblies 19 and 20, wherein each winding assembly 19, 20 comprises an outer primary or higher-voltage winding 21 and an inner low-voltage or secondary winding 22. The higher-voltage winding 21 and the lower-voltage winding 22 are each disposed concentrically to one another. As has already been stated, each winding assembly can also have further windings such as, for example, an auxiliary operating winding and/or a step winding. In one variant of the invention, the secondary winding and optionally further windings lie on the outside while the primary winding lies on the inside.

[0041] A core leg 23 or 24, respectively, of a core 25 extends through each winding assembly 19 or 20 respectively, which core has, in addition to the core legs 23 and 24, an upper yoke 26 and a lower yoke 27, to which the core legs 23 and 24 of their two ends are connected. In this way, the core 25 forms a closed iron circle. It can be further identified that the winding assemblies 19 or 20 respectively of the active part 18 are each disposed in one of the tube sections 6 or 7 respectively of the central part 3. The tube sections enclose the respective winding assembly over the entire circumference. During operation of the railway transformer, the tank 2 is filled with an insulating fluid, for example, an ester oil, a mineral oil, a silicone oil, or the like. Since the tube sections surround their associated winding assembly over the entire circumference, insulating fluid from the tube section 6 can only enter into the tube section 7 via the internal volume of one of the end casings 4 or 5.

[0042] In the axial direction, the winding assemblies 19 or 20 respectively are surmounted by the core legs. The ends of the core legs 24 and the yokes 26, 27 are therefore not disposed in the central part 3 but in the respective end casings 4 or 5 respectively of the tank 2. More precisely, the upper yoke 26 is disposed inside the end casing 4 and the lower yoke 27 is disposed inside the end casing 5. In each case, the active part with its core 25 is disposed completely inside the tank 2.

[0043] FIG. 3 shows the structure of the middle 3 of the housing 2 of the railway transformer according to FIG. 1 more precisely. In particular, in this perspective view the tube sections 6 and 7 can be identified as well as the cavities 28 and 29 delimited by them in each case, which are configured to be circular cylindrical. These circular cylindrical hollow cylinders have a somewhat larger radius than the respective winding assembly so that in the radial direction, a uniform spacing of 3-5 mm is provided between winding assembly and inner side of the tube sections. This makes it possible to receive the winding assemblies of the active part fabricated from a non-conducting material in a shape-complementary manner.

[0044] FIG. 3 also shows the front flange portion 9 in more detail. In particular, it can be seen that this has holes open on one side, that are provided with an internal thread, into which suitable screws can be screwed. Furthermore the circumferential O ring 31 can be identified, which is used for fluid tight connection of the central part 3 to the respective end casing 4 or 5, respectively.

[0045] FIG. 4 shows the end casing 5 of the railway transformer 1 according to FIG. 1 in a perspective view from inside. The hand holes 14 are shown in FIG. 4 without the cover required during operation. A simple plate, which is placed on the side wall and, for example, is firmly connected to the corresponding side wall of the end casing 5 by screwing, is used as cover. A circumferential O ring 31 is again used for fluid tight closure of the hand hole 14. Furthermore, the longitudinal sections of the L-shaped retaining parts 17 can be seen, which enable mounting of the end casing on the bottom region. Furthermore, through-holes 32 can be identified, which enable the insertion of feedthroughs and/or other connections in the interior of the end casing 5.

[0046] FIG. 5 shows the railway transformer 1 according to FIG. 1 together with the fastening means 33, which are designed as supporting frame 33. The supporting frame 33 has two mutually opposite longitudinal members 34, which are aligned parallel to one another, between which a front and rear cross member 35 extend. In this case, the railway transformer 1 rests only with its end casings 4 or 5 respectively and specifically with the retaining part 17 mounted firmly on the end casings, on the respective cross member 35 and can be fastened mechanically there. In this way, the introduction of high forces into the central part 3 is avoided. According to the present invention, the central part 3 can therefore be fabricated from a light material and, in the exemplary embodiment shown, consists of a glass-fiber-reinforced base material (GFP). Fastening bolts 36 used to mount the railway transformer 1 on a rail vehicle in the horizontal position project laterally at the longitudinal members 34.