Housing for a drive device of an on-load tap changer, on-load tap changer and transformer

Abstract

The utility model relates to a kind of housings for the drive device of on-load tap changer.To reliably seal the drive device of on-load tap changer on transformer tank and realize simple assembly, the housing (1) includes the pedestal (2) for accommodating drive device, the intermediate part (3) at least partially sheaths the pedestal and the outer cover (4) at least partially covers the pedestal and the intermediate part, wherein the pedestal (2) and the intermediate part (3) are clamped to the edge of the mounting port in the wall portion (5) of transformer tank, first sealing portion (7) is provided between the pedestal (2) and the inside of the wall portion (5), second sealing portion (8) is provided between the intermediate part (3) and the outside of the wall portion (5), and third sealing portion (9) is provided between the outer cover (4) and the pedestal (2).The utility model also includes a kind of on-load tap changer and a kind of transformer.

Description

Technical Field

[0001] This utility model relates to a housing for a drive device for an on-load tap changer, an on-load tap changer, and a transformer. Background Technology

[0002] An on-load tap-change (OLTC) is a core component of a transformer, especially an adjustable transformer or distribution transformer, enabling load switching. The OLTC adjusts the turns ratio by switching the taps of the transformer windings, thereby achieving stable regulation of the output voltage. An OLTC typically includes a drive unit, a switching switch, a selector, and an optional preselector.

[0003] When the on-load tap changer is integrated with the transformer, the main body of the on-load tap changer needs to be embedded in the transformer tank, specifically immersed in the transformer oil. To avoid transformer oil immersion, reduce electromagnetic interference, and facilitate operation and maintenance, the drive unit of the on-load tap changer needs to be externally mounted within the transformer tank and equipped with a corresponding housing. Since transformers are mostly used outdoors, this places high demands on the housing of the drive unit for the on-load tap changer: it must not only prevent rainwater, moisture, dust, and even air from entering the drive unit, but also prevent rainwater, moisture, dust, and even air from entering the transformer interior through the connection between the housing and the transformer tank, thus avoiding contamination of the transformer oil, corrosion of the main body of the on-load tap changer and the transformer windings, and even short-circuit faults.

[0004] In view of this, there is an urgent need to improve the housing of the drive unit for the on-load tap changer, the on-load tap changer itself, and the transformer, so that the drive unit for the on-load tap changer is reliably sealed in the transformer housing. Utility Model Content

[0005] The objective of this invention is to provide a housing for an on-load tap changer drive unit, an on-load tap changer, and a transformer that can reliably seal the drive unit of an on-load tap changer onto the transformer housing, while also enabling simple assembly.

[0006] The first aspect of this utility model relates to a housing for a drive device of an on-load tap changer, wherein the housing includes a base for accommodating the drive device, an intermediate component that at least partially mounts the base, and an outer cover that at least partially covers the base and the intermediate component, wherein the base and the intermediate component are clamped to the edge of a mounting opening in a wall of a transformer housing, a first sealing portion is provided between the inner side of the base and the wall, a second sealing portion is provided between the outer side of the intermediate component and the wall, and a third sealing portion is provided between the outer cover and the base.

[0007] Within the scope of this utility model, the housing of the drive device for an on-load tap changer is divided into three parts: a base, an intermediate component, and an outer cover. The base accommodates the drive device for the on-load tap changer, which is externally mounted on the transformer. The intermediate component is at least partially fitted onto the base, such that the base and the intermediate component are clamped to the edges of the mounting openings in the transformer tank wall from the inside and outside, respectively. In this way, the housing can be securely fastened to the transformer tank. To prevent rainwater, moisture, dust, and even air from entering the transformer interior through the gaps between the intermediate component, the base, and the transformer tank wall, a first sealing part is provided not only between the inner side of the base and the wall but also a second sealing part is provided between the outer side of the intermediate component and the wall. Thus, the two seals effectively prevent rainwater, moisture, dust, and even air from intruding into or accumulating in these gaps, thereby effectively preventing transformer oil contamination, corrosion of the on-load tap changer and transformer windings, and even short-circuit faults caused by these factors. This also prevents transformer oil from leaking into the transformer through the aforementioned gaps, which could lead to a drop in oil level and weakened insulation performance. Furthermore, an outer cover is provided to protect the on-load tap changer's drive mechanism, at least partially shielding the base and the portion of the intermediate components located outside the transformer tank. To prevent rainwater, moisture, dust, and even air from entering the on-load tap changer's drive mechanism, a third sealing section is provided between the outer cover and the base, effectively preventing the influence of rainwater, moisture, dust, and even air on the drive mechanism.

[0008] The housing of the on-load tap changer drive unit according to this invention firstly ensures a secure fastening of the drive unit to the transformer. Secondly, the three-part housing allows for layered installation and sealing, greatly simplifying assembly and facilitating subsequent maintenance and repair. Furthermore, the first and second sealing parts located between the base, intermediate components, and the transformer tank wall, respectively, prevent rainwater, moisture, dust, and even air from intruding into or accumulating in these gaps. Simultaneously, the third sealing part between the outer casing and the base protects the on-load tap changer drive unit from the influence of rainwater, moisture, dust, and even air.

[0009] According to one embodiment of this utility model, the base may include a receiving cavity with an opening and a first flange extending outwardly around the bottom surface of the receiving cavity. The first flange may be configured to fasten the base to the inner side of the wall of the transformer housing, such that the receiving cavity extends from the mounting opening in the wall of the transformer housing to the outside of the transformer housing. The intermediate component may include a sleeve for fitting onto the receiving cavity and a second flange extending radially around the bottom end of the sleeve. The second flange may be configured to fasten the intermediate component to the outer side of the wall of the transformer housing. The outer cover may be configured to fasten to the opening of the base and at least partially cover the sleeve of the intermediate component. Here, the first flange and the second flange are used to securely fasten the housing to the edge of the mounting opening in the wall of the transformer housing, while providing sealing surfaces for the first sealing portion and the second sealing portion.

[0010] According to one embodiment of this utility model, the fastening can be achieved using screws, and a first blind hole for the screw is provided in the first flange, and / or a second blind hole for the screw is provided in the side wall of the receiving cavity. To avoid unwanted leakage at the threaded connection, the first blind hole prevents rainwater, moisture, dust, and even air from seeping into the transformer tank; while the second blind hole prevents rainwater, moisture, dust, and even air from seeping into the receiving cavity through the threaded connection. Here, the first blind hole may, for example, protrude from the first flange toward the interior of the transformer tank.

[0011] According to one embodiment of this utility model, the first blind hole is disposed on the inner side of the first sealing part; and / or the second blind hole is disposed on the outer side of the third sealing part. By scientifically designing the positional relationship between the blind hole and the sealing part, the sealing effect is further optimized and rainwater, moisture, dust, and even air are prevented from intruding into the transformer tank and / or drive device along the screw.

[0012] According to one embodiment of this utility model, a first through hole for a screw can be provided in the second flange, through which a screw passing through the first through hole can penetrate the wall of the transformer housing and be screwed into the first blind hole; and / or a second through hole for a screw can be provided in the outer casing, through which a screw passing through the second through hole can be screwed into the second blind hole. Here, the first through hole is provided to cooperate with the clamping of the intermediate component and the base onto the wall of the transformer housing. It should be noted that the first blind hole in the first flange can not only receive screws for fastening the first flange to the wall of the transformer housing, but also screws for fastening the second flange, the wall of the transformer housing, and the first flange together. It is particularly advantageous that these two types of screws are alternately arranged around the mounting opening in the wall of the transformer housing.

[0013] According to one embodiment of this utility model, the second sealing part can be provided at least inside the first through hole. Since rainwater, moisture, dust, etc. often accumulate at the bottom of the sleeve of the intermediate component, providing a second sealing part inside the first through hole can effectively prevent such situations from occurring.

[0014] According to one embodiment of this utility model, the first sealing portion, the second sealing portion, and / or the third sealing portion are respectively formed by at least one of an elastic sealing element, a sealant, and a labyrinth sealing structure; and / or the first sealing portion, the second sealing portion, and / or the third sealing portion are provided with grooves. Here, the first sealing portion, the second sealing portion, and / or the third sealing portion can be selected in various ways as needed. To achieve the best possible sealing effect, one or a combination of two or three of the elastic sealing element, the sealant, and the labyrinth sealing structure are all acceptable.

[0015] According to one embodiment of this utility model, the elastic seal can be configured as a sealing ring, a sealing strip, or a sealing gasket. In particular, different elastic seals can be used for different sealing parts. For example, sealing rings can be selected for the first and third sealing parts, while sealing strips, especially adhesive-coated sealing strips, can be selected for the second sealing part to facilitate simple assembly of intermediate components.

[0016] According to one embodiment of this utility model, the driving device may include a drive motor. Additionally, the driving device may include a transmission mechanism connected to the drive motor. Here, the main body of the on-load tap changer can be directly driven by the drive motor or can be connected to the drive motor via an intermediate transmission mechanism.

[0017] According to one embodiment of this utility model, a shaft hole may be provided in the base, particularly its bottom surface, for the drive device to be driven and connected to the main body of the on-load tap changer. Needless to say, the shaft hole is preferably sealed to prevent transformer oil from overflowing into the housing through the shaft hole.

[0018] According to one embodiment of the present invention, the base may be configured with a protruding tongue extending toward the interior of the transformer housing to serve as a support frame for supporting the main body of the on-load tap changer; and / or the housing may be made of metal, particularly aluminum alloy.

[0019] According to one embodiment of this invention, the cable for the drive device can be connected to the interior of the housing via a sealing joint on the outer casing. Here, the sealing joint for the cable reliably prevents rainwater, moisture, dust, and even air from entering the housing.

[0020] The second aspect of this utility model relates to an on-load tap changer, wherein the on-load tap changer includes a housing of a drive device for an on-load tap changer according to the first aspect of this utility model.

[0021] The third aspect of this utility model relates to a transformer, wherein the transformer includes: a housing for a drive device for an on-load tap changer according to the first aspect of this utility model; and / or an on-load tap changer according to the second aspect of this utility model.

[0022] It should be noted that the features, functions, effects, and advantages of one aspect of this utility model can also be referred to the above description of other aspects of this utility model. Furthermore, the various aspects described in this utility model can be combined with each other in various ways.

[0023] Other features of this invention are derived from the accompanying drawings and the detailed description. All features and combinations thereof mentioned above in the specification, as well as features and combinations thereof mentioned below in the detailed description and / or shown separately in the drawings, can be used not only in the corresponding combinations given, but also in other combinations, or in their individual states. Attached Figure Description

[0024] Figure 1 A perspective view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention is shown.

[0025] Figure 2 A partial cross-sectional view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention is shown.

[0026] Figure 3A side view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention is shown.

[0027] Figure 4 The base of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention is shown;

[0028] Figure 5 The diagram shows an intermediate component of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention;

[0029] Figure 6 The diagram shows the housing cover of a drive device for an on-load tap changer according to an embodiment of the present invention; and

[0030] Figure 7 A partial cross-sectional view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention is shown. Detailed Implementation

[0031] First, it should be noted that the same components are substantially referred to by the same reference numerals or the same component names in different embodiments. In the figures, to facilitate understanding of the structure of the housing for the drive device of the on-load tap changer, the various components are shown not to scale and / or enlarged and / or reduced.

[0032] Figure 1 This diagram shows a perspective view of the housing of a drive unit for an on-load tap changer according to an embodiment of the present invention. The housing 1 of the drive unit for the on-load tap changer includes a base 2 for accommodating the drive unit, an intermediate component 3 for at least partially fitting the base 2, and an outer cover 4 for at least partially covering the base 2 and the intermediate component 3. The base 2 and the intermediate component 3 are clamped to the edge of a mounting opening in a wall of a transformer housing (not shown). A first sealing portion 7 is provided between the inner side of the base 2 and the wall 5, a second sealing portion 8 is provided between the outer side of the intermediate component 3 and the wall 5, and a third sealing portion 9 is provided between the outer cover 3 and the base 2.

[0033] Figure 2A partial cross-sectional view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention is shown. It can be clearly seen in the figure that the base 2 includes a receiving cavity 22 with an opening and a first flange 24 extending outwardly around the bottom surface of the receiving cavity 22. The first flange 24 is configured to fasten the base 2 to the inner side of the wall 5 of the transformer housing, such that the receiving cavity 22 protrudes from a mounting port 6 in the wall 5 of the transformer housing to the outside of the transformer housing. The intermediate component 3 includes a sleeve 25 for fitting onto the receiving cavity 22 and a second flange 26 extending radially around the bottom end of the sleeve 25. The second flange 26 is configured to fasten the intermediate component 3 to the outer side of the wall 5 of the transformer housing. The outer cover 4 is configured to fasten to the opening of the base 2 and at least partially cover the sleeve 25 of the intermediate component 3.

[0034] exist Figure 1 and 2 In the illustrated embodiment, the base 2 is used to house the drive unit 19 of the on-load tap changer, which needs to be externally mounted on the transformer. The intermediate component 3 is at least partially fitted onto the base 2, such that the base 2 and the intermediate component 3 are clamped from the inside and outside to the edges of the mounting openings 6 in the wall 5 of the transformer housing, respectively. In this way, the housing 1 can be securely fastened to the transformer housing (not shown). Furthermore, the housing 1, divided into the aforementioned three parts, allows for layered installation and sealing, greatly simplifying assembly operations and facilitating subsequent maintenance and repair.

[0035] On the other hand, to prevent rainwater, moisture, dust, and even air from entering the transformer tank through the gaps between the intermediate component 3, the base 2, and the transformer tank wall 5, a first sealing part 7 is provided between the inner side of the base 2 and the wall 5, and a second sealing part 8 is provided between the outer side of the intermediate component 3 and the wall 5. This double sealing effectively prevents rainwater, moisture, dust, and even air from intruding through the aforementioned gaps or accumulating in these gaps, especially at the bottom of the bushing. It also prevents transformer oil from overflowing from the aforementioned gaps, thus avoiding a drop in oil level and weakened insulation performance. Furthermore, an outer cover 4 is provided to protect the on-load tap changer drive unit 19, at least partially covering the portions of the base 2 and intermediate component 3 that are external to the transformer tank. To prevent rainwater, moisture, dust, and even air from entering the on-load tap changer drive unit 19, a third sealing part 9 is provided between the outer cover 4 and the base 2. Thus, the base 2, intermediate component 3, and outer cover 4 of the housing 1 are nested together and installed in the mounting opening 6 of the wall 5 of the transformer box, and the sealing effect, especially liquid sealing and / or gas sealing effect, is reliably achieved through triple sealing between them.

[0036] Preferably, the first sealing portion 7, the second sealing portion 8, and / or the third sealing portion 9 can each be formed by at least one of an elastic seal, a sealant, and a labyrinth seal structure. Particularly advantageously, liquid and / or gas tightness can be further ensured by combining different sealing measures, such as an elastic seal with a sealant or an elastic seal with a labyrinth seal structure. Here, the elastic seal can be configured, for example, as a sealing ring (e.g., Figure 2 (As shown), sealing strips or gaskets. Using resilient seals can at least partially reduce the mechanical impact of transformer vibration on the on-load tap changer. Considering the application scenarios of transformers and on-load tap changers, resilient seals can be selected from: rubber seals, such as nitrile rubber seals, fluororubber seals, silicone rubber seals, etc.; plastic seals, such as PTFE seals, nylon seals, etc.; or metal seals, such as metal-coated gaskets, metal O-rings, etc.

[0037] Alternatively or additionally, the first sealing part 7, the second sealing part 8, and / or the third sealing part 9 may be provided with grooves, as in subsequent applications. Figure 7 The first groove 7' and / or the third groove 9' shown are illustrated. These grooves simplify the assembly of the housing 1 and ensure the installation position of the corresponding resilient seals.

[0038] also, Figure 2 The partial cross-sectional view also shows the housing of the drive unit 19 within the housing 1. The base 2 has an opening, a receiving cavity 22, which is enclosed by an outer casing 4. It is particularly advantageous to use the outer casing to increase the total volume of the receiving cavity 22. The drive unit 19 may include at least a drive motor 17. Particularly preferably, as... Figure 2 As shown, the drive unit 19 may also include a transmission mechanism 18 connected to the drive motor 17 if necessary. The transmission mechanism 18 may include, for example, gears, Maltese wheels, and / or linkage mechanisms, etc., for precisely controlling the switching position of the on-load tap changer. Figure 2 In this configuration, the drive motor 17 and the transmission mechanism 18 are preferably arranged in layers within the receiving cavity 22. To adjust the main body of the on-load tap changer located within the transformer tank, such as the switching switch, selector, and, if necessary, preselector, a shaft hole (not shown here) is provided in the base 2, particularly its bottom surface, to facilitate the drive unit 19's transmission connection to the main body of the on-load tap changer within the transformer tank. Through this shaft hole, the drive shaft of the drive unit 19 can extend vertically downwards into the transformer tank and be transmitted to a transmission shaft orthogonal to the drive shaft in the main body of the on-load tap changer via a bevel gear or the like.

[0039] In addition, to provide power and / or control signals to the drive unit 19, the cable 21 for the drive unit 19 can be connected to the interior of the housing 1 via a sealing joint 20 on the outer casing 4. The sealing joint 20 prevents rainwater, moisture, dust, and even air from entering the housing 1 along the cable 21. For this purpose, the sealing joint 20 may include, for example, a gasket and a threaded connection structure.

[0040] exist Figure 2 In the illustrated embodiment, the base 2 and intermediate component 3 are clamped and fastened to the edge of the mounting opening 6 in the wall portion 5 of the transformer housing using screws. For this purpose, a first blind hole 10 for the screw, specifically a flat-head screw 14, is provided in the first flange 24 of the base 2. Simultaneously, a first through hole 12 for the flat-head screw 14 can be provided in the second flange 26 of the intermediate component 3. Thus, the flat-head screw 14 passes through the second flange 26, through the wall portion 5 of the transformer housing, and is screwed into the first blind hole 10 in the first flange 24, thereby fastening the intermediate component 3, the wall portion 5 of the transformer housing, and the base 2 together. The fastening of the flat-head screw 14 simultaneously compresses the first sealing portion 7 located between the inner sides of the base 2 and the wall portion 5, along with the second sealing portion 8 located between the outer sides of the intermediate component 2 and the wall portion 5, thereby achieving reliable sealing. Figure 2 It can also be seen that the first blind hole 10 is located inside the first sealing part 7, while the second sealing part 8 is located inside the first through hole 12. To further improve the sealing effect, it is also possible to provide another second sealing part 8' outside the first through hole 12.

[0041] Figure 3 This is a side view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention. Figure 3 Understandably, in addition to the flat-head screws 14 that fasten the intermediate component 3, the transformer housing wall 5, and the base 2 to each other, the first blind hole 10 in the first flange 24 can also be used for screws that pass only through the transformer housing wall 5 and the first flange 24, so that during assembly, only the base 2 is fastened to the transformer housing wall 5 first, thereby enabling the individual installation of the parts of the housing 1 and thus simplifying the assembly complexity. Particularly advantageously, to avoid and protect such screws, a protrusion 27 can be provided on the second flange 26 of the intermediate component 3.

[0042] from Figure 3 It can be seen that below the first flange 24, except for the first blind hole 10,

[0043] The base 2 also has a protruding tongue 31 extending toward the interior of the transformer tank for supporting the main body of the on-load tap changer 33 (see...). Figure 7The tongue 31 has a connecting hole 32 for connecting to the support frame 33, particularly for threaded connection.

[0044] In addition, in order to flexibly accommodate the drive unit 19, the bottom surface of the base 2 can also be partially displaced downwards.

[0045] Figure 4 This illustration shows a base for the housing of a drive device for an on-load tap changer according to an embodiment of the present invention. The base 2 can be divided into a receiving cavity 22 with an opening and a first flange 24 extending outwards or radially around the bottom surface of the receiving cavity 22. Here, one or more positioning posts and / or one or more positioning recesses can be provided in the receiving cavity 22 for positioning the drive device 19, such as a drive motor 17, and, if necessary, a transmission mechanism 18. A plurality of evenly distributed first blind holes 10 can be provided on the first flange 24 around the receiving cavity 22, effectively preventing rainwater, moisture, dust, and even air from seeping into the transformer tank through the threaded connections. The first blind holes 10 can, for example, protrude from the first flange 24 toward the interior of the transformer tank. Furthermore, the plurality of evenly distributed first blind holes 10 can facilitate uniform stress on the wall portion 5 of the transformer tank and uniformly press the first sealing portion 7. Another advantage is that the screws for fastening the first flange 24 to the wall 5 of the transformer housing and the screws for fastening the second flange 26, the wall 5 of the transformer housing, and the first flange 24 can be alternately arranged around the mounting opening 6 in the wall 5 of the transformer housing.

[0046] To ensure stable holding and convenient installation of the first sealing part 7, a first groove 7' may also be provided on the first flange 24. Particularly advantageously, the first blind hole 10 may be provided inside the first sealing part 7.

[0047] exist Figure 4 As can be clearly seen, a second blind hole 11 for a screw is provided in the side wall 23 of the receiving cavity 22. Figure 1 As shown, the screw, specifically the countersunk screw 16, can be screwed into the second blind hole 11 through the second through hole 13 on the outer cover 4, thereby fastening the outer cover 4 to the base 2. Multiple second blind holes 11 can advantageously be evenly distributed around the receiving cavity 22 in the side wall 23 of the receiving cavity 22 to uniformly press the third sealing part 9. Furthermore, the third sealing part 9 can also be provided with a third groove 9'. Particularly advantageously, the second blind holes 11 can be located on the outside of the third sealing part 9, thereby further optimizing the sealing effect and preventing rainwater, moisture, dust, and even air from entering the drive device 19 along the screw. To facilitate the tightening operation of the screw, i.e., the countersunk screw 16, a through groove 28 recessed inward from the arcuate surface of the outer cover is provided above the second through hole 13.

[0048] Figure 5 This illustration shows an intermediate component of the housing of a drive unit for an on-load tap changer according to an embodiment of the present invention. The intermediate component 3, which at least partially houses a base 2, includes a sleeve 25 for fitting onto a receiving cavity 22 of the base 2, and a second flange 26 extending radially around the bottom end of the sleeve 25. The second flange 26 is configured to secure the intermediate component 3 to the outer side of a wall 5 of a transformer housing. The second flange 26 is substantially identical in shape and size to and therefore overlaps with a first flange 24 of the base 2. In the second flange 26, first through holes 12 for screws used to secure the second flange 26, the wall 5 of the transformer housing, and the first flange 24 are alternately distributed with protrusions 27 covering the screws used to secure the wall 5 of the transformer housing to the first flange 24.

[0049] Figure 6 The diagram shows the outer casing of a drive unit for an on-load tap changer according to an embodiment of the present invention. The casing 4, which at least partially covers the base 2 and the intermediate component 3, is configured as a sleeve 25 for fastening to the opening in the base 2 and at least partially covering the intermediate component 3. Figure 6 As shown, the outer cover 4 is constructed with a boss 27. The boss 27 extends flat to secure itself to the opening of the base 2 and provides a sealing surface below for the third sealing portion 9. To achieve this securing, a second through hole 13 for a screw, specifically a countersunk screw 16, is provided on the boss 27. An arc-shaped cover 30 is connected above the boss 27. This cover 30 closes the opening of the receiving cavity 22 of the base 2 and increases the volume of the receiving cavity 22, while a vertically extending enclosure 29 is constructed below the boss 27. From Figure 2 and Figure 7 It can be seen that the enclosure 29 at least partially covers the side wall 23 of the receiving cavity 22 of the base 2 and the sleeve 25 of the intermediate component 3.

[0050] Figure 7 This diagram shows a partial cross-sectional view of the housing of a drive device for an on-load tap changer according to an embodiment of the present invention. Compared to Figure 2 ,exist Figure 7The transformer housing wall 5, second sealing part 8, third sealing part 9, and drive device 19 are not shown in the diagram, which allows for a clearer view of the shape of the receiving cavity and the positional relationship of the three parts of the housing 1 in the assembled state. Here, the first sealing part 7 is configured as a sealing ring as an elastic seal. An annular first groove 7' is formed for this sealing ring in the first flange 24 of the base 2. It is particularly advantageous that the lower side of the second flange 26 of the intermediate part 3 is configured such that the middle region protrudes slightly relative to the side regions to provide positioning assistance for the second sealing part 8 and optionally an additional second sealing part 8'. At the same time, in order to properly hold the third sealing part 9, a third groove 9' is also formed on the top of the side wall 23 of the receiving cavity 22 of the base 2. The lower side of the boss 27 of the outer cover 4 is configured to be flat, so that the lower side can rest against the top of the side wall 23 when the third sealing part 9 is provided in the middle.

[0051] also, Figure 7 The diagram also shows a protruding tongue 31 extending into the transformer tank from the base 2, serving as a support frame 33 for supporting the main body of the on-load tap changer. Here, the support frame 33 is configured as one or more slats that support the on-load tap changer's switching mechanism, selector, and optional preselector below. A connection hole 32 is provided on the protruding tongue 31 for connection, particularly a threaded connection, to the support frame 33, i.e., the vertically extending slats. Here, the lower side of the base 2, the first blind hole 10, the protruding tongue 31, and the main body of the on-load tap changer can be immersed in the transformer oil within the transformer tank.

[0052] In order to reliably carry the on-load tap changer, the housing 1, especially its base 2, intermediate components 3 and outer cover 4 can be made of metal, especially aluminum alloy.

[0053] Not limited to Figures 1 to 7 In the case shown where the housing 1 is set on the top surface of the transformer box, the housing 1 of the drive device for the on-load tap changer can be arbitrarily set on any surface of the transformer box, such as the side surface or the bottom surface.

[0054] Other embodiments of the present invention may also include an on-load tap changer and a transformer, wherein the on-load tap changer includes a housing of a drive device for an on-load tap changer according to the present invention; and the transformer includes a housing of a drive device for an on-load tap changer according to the present invention and / or an on-load tap changer according to the present invention.

[0055] This invention is not limited to the embodiments shown, but includes or extends to all technical equivalents that fall within the scope of the appended claims. The positional descriptions chosen in the specification, such as, for example, top, bottom, left, right, etc., refer to the direct description and the accompanying drawings, and can be adapted to new positions according to their meaning when the positions change.

[0056] The features disclosed in this application are important for the implementation of embodiments in different design aspects, not only individually but also in any combination.

[0057] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solution of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A housing for a drive device of an on-load tap changer, characterized in that, The housing (1) includes a base (2) for accommodating a drive unit, an intermediate component (3) for at least partially fitting the base, and an outer cover (4) for at least partially covering the base and the intermediate component. The base (2) and the intermediate component (3) are clamped to the edge of the mounting opening (6) in the wall (5) of the transformer housing. A first sealing part (7) is provided between the inner side of the base (2) and the wall (5), a second sealing part (8) is provided between the outer side of the intermediate component (3) and the wall (5), and a third sealing part (9) is provided between the outer cover (4) and the base (2).

2. The housing of the drive device for an on-load tap changer according to claim 1, characterized in that, The base (2) includes a receiving cavity (22) with an opening and a first flange (24) extending outward from the bottom surface of the receiving cavity (22), the first flange being configured to fasten the base (2) to the inner side of the wall portion (5) of the transformer housing, such that the receiving cavity (22) extends outward from the mounting port (6) in the wall portion (5) of the transformer housing; the intermediate component (3) includes a sleeve (25) for fitting onto the receiving cavity (22) and a second flange (26) extending radially around the bottom end of the sleeve (25), the second flange (26) being configured to fasten the intermediate component (3) to the outer side of the wall portion (5) of the transformer housing; and the outer cover (4) is configured to fasten to the opening of the base (2) and at least partially cover the sleeve (25) of the intermediate component (3).

3. The housing of the drive device for an on-load tap changer according to claim 2, characterized in that, The fastening is performed by screws, and a first blind hole (10) for the screw is provided in the first flange (24), and / or a second blind hole (11) for the screw is provided in the sidewall (23) of the receiving cavity (22).

4. The housing of the drive device for an on-load tap changer according to claim 3, characterized in that, The first blind hole (10) is disposed inside the first sealing part (7); and / or the second blind hole (11) is disposed outside the third sealing part (9).

5. The housing of the drive device for an on-load tap changer according to claim 4, characterized in that, A first through hole (12) for screws is provided in the second flange (26), through which screws passing through the first through hole (12) penetrate the wall (5) of the transformer housing and are screwed into the first blind hole (10); and / or a second through hole (13) for screws is provided in the outer cover (4), through which screws passing through the second through hole (13) are screwed into the second blind hole (11).

6. The housing of the drive device for an on-load tap changer according to claim 5, characterized in that, The second sealing part (8) is provided at least inside the first through hole (12).

7. The housing of the drive device for an on-load tap changer according to any one of claims 1 to 6, characterized in that, The first sealing part (7), the second sealing part (8) and / or the third sealing part (9) are formed by at least one of the following: an elastic seal, a sealant and a labyrinth seal structure.

8. The housing of the drive device for an on-load tap changer according to claim 7, characterized in that, The elastic seal is configured as a sealing ring, sealing strip or sealing gasket; and / or the first sealing part (7), the second sealing part (8) and / or the third sealing part (9) are provided with grooves.

9. The housing of the drive device for an on-load tap changer according to any one of claims 1 to 6, characterized in that, The drive unit (19) includes a drive motor (17).

10. The housing of the drive device for an on-load tap changer according to claim 9, characterized in that, The drive device (19) includes a transmission mechanism (18) connected to the drive motor (17).

11. The housing of the drive device for an on-load tap changer according to claim 9, characterized in that, A shaft hole is provided in the base (2) so that the drive device (19) can be connected to the main body of the on-load tap changer.

12. The housing of the drive device for an on-load tap changer according to any one of claims 1 to 6, characterized in that, The base (2) has a protruding tongue (31) extending toward the inside of the transformer housing for supporting the main body of the load tap changer (33); and / or the housing (1) is made of metal.

13. The housing of the drive device for an on-load tap changer according to any one of claims 1 to 6, characterized in that, The cable (21) for the drive unit (19) is connected to the interior of the housing (1) via a sealing joint (20) on the outer cover (4).

14. An on-load tap changer, characterized in that, The on-load tap changer includes a housing of a drive device for an on-load tap changer as described in any one of claims 1 to 13.

15. A transformer, characterized in that, The transformer includes: Housing for a drive device for an on-load tap changer according to any one of claims 1 to 13; and / or The on-load tap changer according to claim 14.

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