Observation window structure and oil type transformer

Abstract

The utility model discloses an observation window structure and an oil type transformer, relates to the related technical field of oil type transformers, and is used for solving the problem that the observation process of the oil quantity and the residual space in an oil collecting cavity of an oil collecting part is tedious. The observation window structure is applied to the oil collecting piece, an oil collecting cavity used for collecting oil is formed in the oil collecting piece, an opening communicated with the oil collecting cavity is formed in a top cover of the oil collecting piece, and the observation window structure is used for being arranged at the opening; the observation window structure comprises a body and an oil leakage hole formed in the body, the body is provided with a first surface and a second surface which are arranged oppositely, and the oil leakage hole penetrates through the first surface and the second surface. The residual capacity in the oil collection cavity can be rapidly and visually observed through the oil leakage hole, and the effect of collecting leaked oil is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil type transformer, and particularly relates to an observation window structure and an oil type transformer. BACKGROUND

[0002] The oil type transformer usually uses mineral oil for cost consideration, and the customer selects environmentally friendly vegetable oil with higher cost only when the customer has a demand. During the use of the oil type transformer, oil leakage may occur. In order to avoid environmental pollution and the influence on the site caused by the oil leakage, an oil storage tank is arranged at the bottom of the oil type transformer to collect the leaked oil.

[0003] The oil storage tank collects the leaked oil and rainwater flows into the oil storage tank at the same time, so a window needs to be arranged to maintain and observe the remaining capacity of the oil storage tank through the window. However, the existing window is provided with a sealing plate, and the sealing plate needs to be removed when the remaining capacity of the oil storage tank is observed, and the sealing plate is installed to the window after the observation is completed, so that the observation process of the remaining capacity of the oil storage tank is relatively cumbersome and the remaining capacity of the oil storage tank is inconvenient to observe. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an observation window structure and an oil type transformer, which can solve the problem that the observation process of the remaining capacity of the existing oil tank is cumbersome.

[0005] To achieve the above purpose, in a first aspect, the observation window structure is applied to an oil collecting member, an oil collecting cavity for collecting oil is formed in the oil collecting member, an opening in communication with the oil collecting cavity is arranged on a top cover of the oil collecting member, and the observation window structure is arranged at the opening.

[0006] The observation window structure comprises a body and an oil leakage hole arranged in the body, the body has a first surface and a second surface arranged oppositely, and the oil leakage hole is arranged through the first surface and the second surface.

[0007] In some embodiments of the present application, the oil leakage hole comprises a plurality of first oil leakage holes arranged in an array, each first oil leakage hole is arranged through the first surface and the second surface, and the hole wall thereof is continuous and uninterrupted in the circumferential direction.

[0008] In some embodiments of the present application, the body further has a side wall connecting the first surface and the second surface, the oil leakage hole comprises a plurality of second oil leakage holes, the plurality of second oil leakage holes are arranged close to the edge of the body, each second oil leakage hole is arranged through the first surface, the second surface and the side wall, and at least part of the second oil leakage hole is in communication with the opening.

[0009] In some embodiments of the present application, the body has a first direction and a second direction intersecting each other, the first direction and the second direction are both parallel to the first surface, the body comprises a first side and a second side arranged oppositely along the first direction, and a third side and a fourth side arranged oppositely along the second direction.

[0010] The second oil leakage hole is arranged on the first side and the second side.

[0011] And / or.

[0012] The second oil leakage hole is arranged on the third side and the fourth side.

[0013] In some embodiments of the present application, when the body is stacked on the top cover, a part of the second oil leakage hole is projected on the opening, and another part is projected out of the opening.

[0014] In some embodiments of the present application, the oil leakage hole comprises a tapered hole section, one end of the tapered hole section is located in the first surface, and the flow area of the tapered hole section gradually decreases from the first surface to the second surface.

[0015] In some embodiments of the present application, the overlapping area of the oil leakage hole and the opening is greater than or equal to 3 square millimeters and less than or equal to 38.5 square millimeters.

[0016] In some embodiments of the present application, the body is provided with a connecting portion, and the body is detachably connected to the top cover through the connecting portion.

[0017] In the second aspect, the oil transformer provided by the present application comprises:

[0018] A transformer body;

[0019] An oil collecting member connected with the transformer body; and

[0020] The observation window structure of any one of the above technical solutions.

[0021] In some embodiments of the present application, the top cover has an outer wall surface and an inner wall surface arranged opposite to each other, and the inner wall surface and the second surface both face the oil collecting cavity.

[0022] The body is arranged in the opening, or the outer wall surface is provided with a mounting groove arranged on the outer periphery of the opening, and the body is arranged in the mounting groove.

[0023] So that the first surface is flush with the outer wall surface or closer to the inner wall surface relative to the outer wall surface.

[0024] In some embodiments of the present application, the bottom of the oil collecting member is provided with a discharge structure for discharging the oil in the oil collecting member to the outside of the oil collecting member.

[0025] The above technical solutions of the present application have at least the following beneficial effects:

[0026] The oil leakage hole is provided on the body and penetrates the first surface and the second surface. In this way, on the one hand, when observing the remaining capacity in the oil collecting member, the user does not need to remove the body from the top cover of the oil collecting member, and can quickly and intuitively observe the remaining capacity in the oil collecting cavity through the oil leakage hole, thereby facilitating the observation of the remaining capacity in the oil collecting cavity. On the other hand, due to long-time operation or aging of the sealing structure, the oil in the transformer may leak, and the oil can quickly enter the oil collecting cavity through the oil leakage hole. The oil leakage hole can collect the leaked oil, prevent the oil from spreading to the environment, and reduce the safety hazard. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is an exploded view of the observation window structure and the top cover of the oil groove in the embodiment of the present application;

[0029] Figure 2 is an assembly structure schematic view of the observation window structure and the top cover of the oil groove in the embodiment of the present application;

[0030] Figure 3 is a top view of one assembly mode of the observation window structure and the top cover in the embodiment of the present application;

[0031] Figure 4 is a sectional view of one observation window structure in the embodiment of the present application;

[0032] Figure 5 is an enlarged view of A part in Figure 4

[0033] Figure 6 is a top view of another observation window structure in the embodiment of the present application;

[0034] Figure 7 is a top view of still another observation window structure in the embodiment of the present application;

[0035] Figure 8 is a top view of another assembly mode of the observation window structure and the top cover in the embodiment of the present application. The main reference signs in the drawings in the specification of the present application are explained as follows:

[0036] 1-oil collecting member; 11-top cover; 11a-outer wall surface; 11b-inner wall surface; 111-opening;

[0037] ​2 - body; 2a - first surface; 2b - second surface; 2c - side wall; 21 - oil drain hole; 211 - first oil drain hole; 212 - second oil drain hole; 213 - tapered hole section; 22 - first side portion; 23 - second side portion; 24 - third side portion; 25 - fourth side portion; 26 - connecting portion; 22 - body portion; 221 - first oil drain hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The present application provides a kind of observation window structure and oil type transformer, which will be described in detail below respectively.It should be noted that the description order of the following embodiments is not as the preferred order of the embodiments of the present application is limited.And in the following embodiments, the description of each embodiment has its own emphasis, which is not described in detail in a certain embodiment, can be seen from the related description of other embodiments.

[0043] Oil transformer is a kind of power transformer using transformer oil (insulating oil) as cooling and insulating medium. It is widely used in power transmission and distribution system, especially in the field of medium and high voltage. Oil transformer usually uses mineral oil for cost consideration, and customers choose environmentally friendly vegetable oil with higher cost when needed. Oil leakage may occur during the use of oil transformer. In order to avoid the environmental pollution and the influence of oil leakage on the site, an oil collecting part is arranged at the bottom of the oil transformer for collecting the leaked oil.

[0044] The oil tank collects leaked oil and rainwater at the same time, so a window is needed to maintain and observe the remaining capacity of the oil collecting part. Therefore, the application provides an observation window structure, which can make the observation of the remaining capacity in the oil collecting part more convenient.

[0045] Please refer to Figure 1 and Figure 2 The observation window structure is applied to the oil collecting part 1, and the oil collecting cavity for collecting oil is formed in the oil collecting part 1. The top cover 11 of the oil collecting part 1 is provided with an opening 111 communicating with the oil collecting cavity, and the observation window structure is arranged on the opening 111. The observation window structure comprises a body 2 and an oil leakage hole 21 formed in the body 2. The body 2 has a first surface 2a and a second surface 2b arranged opposite to each other, and the oil leakage hole 21 is arranged through the first surface 2a and the second surface 2b.

[0046] In the above manner, the oil leakage hole 21 is formed through the first surface 2a and the second surface 2b on the body 2. Thus, on the one hand, when observing the remaining capacity in the oil collecting part 1, the user does not need to remove the body 2 from the top cover 11 of the oil collecting part 1, and can quickly and intuitively observe the remaining capacity in the oil collecting cavity through the oil leakage hole 21, which facilitates the observation of the remaining capacity in the oil collecting cavity. On the other hand, due to long time operation or aging of the sealing structure, oil leakage may occur in the transformer. The oil can quickly enter the oil collecting cavity through the oil leakage hole 21, and the oil leakage hole 21 can collect the leaked oil, prevent the oil from spreading to the environment, and reduce the safety hazard.

[0047] The oil leakage hole 21 includes a plurality of first oil leakage holes 211 arranged in an array. Each first oil leakage hole 211 is arranged through the first surface 2a and the second surface 2b, and the hole wall is continuous and uninterrupted in the circumferential direction. The plurality of first oil leakage holes 211 arranged in an array can work simultaneously, which can more efficiently collect oil, and is suitable for scenarios with relatively large amount of oil leakage, and can also help to ensure the observation field of view. In other words, the plurality of first oil leakage holes 211 arranged in an array can provide a plurality of oil leakage channels, so that the oil can quickly enter the oil collecting piece 1 from the outside of the oil collecting piece 1 or enter the oil collecting piece 1 uniformly, avoiding the problem that foreign matter outside the oil collecting piece 1 can easily enter the oil collecting piece 1 through a single hole with a relatively large aperture. The first oil leakage hole 211 is arranged through the first surface 2a and the second surface 2b, which can ensure that the oil flows without obstruction, and helps to achieve efficient collection of oil leakage. For example, the plurality of first oil leakage holes 211 are arranged in an array and are arranged close to the center of the body 2.

[0048] In addition, the plurality of first oil leakage holes 211 arranged in an array can make the stress distribution of the entire body 2 more uniform, avoiding the stress concentration phenomenon that can be caused by using a single hole with a relatively large aperture, thereby improving the mechanical strength and deformation resistance of the body 2. The first oil leakage holes 211 arranged in an array have standardized characteristics, and the number, size and spacing of the first oil leakage holes 211 can be flexibly adjusted according to the size requirements of the oil collecting piece 1, thereby realizing modular design. In the actual processing and manufacturing process, the plurality of first oil leakage holes 211 can be processed at one time by stamping, which can greatly reduce the processing steps and time, and the production efficiency can be significantly improved compared with drilling or step-by-step processing.

[0049] In some embodiments, the body 2 also has a side wall 2c connecting the first surface 2a and the second surface 2b, and the oil leakage hole 21 includes a plurality of second oil leakage holes 212 arranged close to the edge of the body 2. Each second oil leakage hole 212 is arranged through the first surface 2a, the second surface 2b and the side wall 2c, and at least partially communicates with the opening 111. The plurality of second oil leakage holes 212 arranged close to the edge of the body 2 can help to quickly guide the oil accumulated at the edge of the body 2 into the oil collecting cavity through the opening 111, avoiding the retention of oil. In particular, when the amount of oil leakage is relatively small, i.e., the oil level is low, the second oil leakage hole 212 can more efficiently collect the leaked oil.

[0050] It should be noted that in some embodiments, the oil leakage hole 21 includes a plurality of first oil leakage holes 211 and a plurality of second oil leakage holes 212. The design that the second oil leakage hole 212 communicates with the opening 111 makes the layout of the oil leakage hole 21 more functional. For example, even if the central oil leakage hole 21 (the first oil leakage hole 211) cannot normally collect the leaked oil due to insufficient oil or blockage, the edge second oil leakage hole 212 can still play an auxiliary role to prevent the oil from spreading to the environment. At the same time, the first oil leakage hole 211 and the second oil leakage hole 212 can realize multi-directional collection of leaked oil, that is, the first oil leakage hole 211 can collect the leaked oil from the top, and the second oil leakage hole 212 can collect the leaked oil from the side, reducing the risk of residual accumulation of the leaked oil.

[0051] Please continue to refer to Figure 1 and Figure 2 The body 2 has a first direction X, a second direction Y, and a third direction Z that intersect with each other. The first direction X and the second direction Y are both parallel to the first surface 2a, and the third direction Z is perpendicular to the first surface 2a. For example, the body 2 has a plate structure, and the third direction Z is the thickness direction of the body 2.

[0052] The body 2 includes a first side 22 and a second side 23 opposite each other along the first direction X, and a third side 24 and a fourth side 25 opposite each other along the second direction Y. The first side 22 and the second side 23 are both provided with the second oil leakage hole 212; and / or; the third side 24 and the fourth side 25 are both provided with the second oil leakage hole 212. Thus, when the second oil leakage hole 212 is provided on the first side 22 and the second side 23, it can be ensured that the body 2 can collect the leaked oil on both sides in the first direction X. When the second oil leakage hole 212 is provided on the third side 24 and the fourth side 25, it can be ensured that the body 2 can collect the leaked oil on both sides in the second direction Y. When the second oil leakage hole 212 is provided on the first side 22, the second side 23, the third side 24, and the fourth side 25, it can be ensured that the body 2 can collect the leaked oil on the sides, and can realize omnidirectional collection from different directions without being limited by the collection direction, thereby further reducing the risk of residual accumulation of the leaked oil.

[0053] It should be noted that Figure 2 The dashed box in the above figure is the projection area of the opening 111 on the body 2.

[0054] As Figure 3As shown, when the body 2 is stacked on the top cover 11, a part of the second oil leakage hole 212 is projected onto the opening 111, and another part is projected outside the opening 111. The stacking design of the body 2 facilitates disassembly, and users can quickly remove the body 2 from the top cover 11, which helps to reduce equipment maintenance time and cost. The stacking of the body 2 and the top cover 11 enhances the strength and carrying capacity of the top cover 11, making the entire structure more stable, especially when subjected to external pressure or vibration, which can effectively prevent deformation or damage.

[0055] The structure and parameters of the oil leakage hole 21 are described in detail below.

[0056] Please refer to Figure 4 and Figure 5 The body 2 provided by the present application is provided with an oil leakage hole 21, and each oil leakage hole 21 includes a tapered hole section 213. One end of the tapered hole section 213 is located in the first surface 2a, and the flow area of the tapered hole section 213 gradually decreases from the first surface 2a to the second surface 2b. The design of the tapered hole section 213 gradually reduces the flow area, which increases the flow rate, thereby accelerating the speed of oil entering the oil collection member 1, which helps to quickly remove accumulated oil and prevent it from stagnating. In addition, as the flow area of the tapered hole section 213 gradually decreases, the increase in flow rate can help carry impurities and particles through the oil leakage hole 21, reducing the likelihood of blockage. Furthermore, using the effect of fluid dynamics, the increase in flow rate can produce a self-cleaning effect, helping to remove deposits and impurities in the oil leakage hole 21, keeping the oil leakage hole 21 clean and functional.

[0057] In some embodiments, the overlapping area of the oil leakage hole 21 and the opening 111 is greater than or equal to 3 square millimeters and less than or equal to 38.5 square millimeters. The overlapping area is the flow area of each oil leakage hole 21, and an overlapping area greater than or equal to 3 square millimeters ensures that the oil leakage hole 21 is large enough for the leaked oil to pass through smoothly and be collected in the oil collection cavity of the oil collection member 1, while an overlapping area less than or equal to 38.5 square millimeters limits the possibility of excessive hole diameter causing impurities and particles to enter the oil collection cavity of the oil collection member 1.

[0058] It should be noted that for embodiments in which each oil leakage hole includes a tapered hole section 213, one end of the tapered hole section 213 is located in the first surface 2a, and the flow area of the tapered hole section 213 gradually decreases from the first surface 2a to the second surface 2b. The flow area of the other end of the tapered hole section 213 is greater than or equal to 3 square millimeters and less than or equal to 38.5 square millimeters.

[0059] Please refer to Figure 6In another embodiment of the present application, the body 2 is provided with oil leakage holes 21, each of which (the first oil leakage hole 211 in the oil leakage holes 21) is a circular through hole with a flow area greater than or equal to 3 square millimeters and less than or equal to 38.5 square millimeters.

[0060] Please refer to Figure 7 In another embodiment of the present application, the body 2 is provided with oil leakage holes 21, each of which (the first oil leakage hole 211 in the oil leakage holes 21) is a circular through hole with a flow area greater than or equal to 3 square millimeters and less than or equal to 38.5 square millimeters.

[0061] In some embodiments of the present application, the body 2 is provided with a connecting portion 26, and the body 2 is detachably connected to the top cover 11 through the connecting portion 26, so as to realize detachable connection between the body 2 and the top cover 11. When maintenance, repair or replacement of components is required, the body 2 and the top cover 11 can be easily detached, thereby reducing maintenance time and labor cost. At the same time, the body 2 can be replaced or adjusted in different application occasions to adapt to different operation requirements or conditions, which helps to improve the versatility of the body 2.

[0062] For example, the connecting portion 26 includes a plurality of connecting holes, and the body 2 and the top cover 11 are connected by bolt fastening. Alternatively, the connecting portion 26 includes a plurality of magnetic members, and the body 2 and the top cover 11 are connected by magnetic connection. Alternatively, the body 2 and the top cover 11 are connected by buckle clamping connection, which can be quickly connected and disconnected without tools, and is suitable for occasions requiring quick replacement. Alternatively, a plug-in type clamping groove structure is designed on the top cover 11, and the body 2 is fixed in place by sliding or rotating the body 2.

[0063] In some embodiments of the present application, the oil transformer includes a transformer body, an oil collecting member 1 and the observation window structure described in any of the above technical solutions. The oil collecting member 1 is connected to the transformer body and is used to collect oil (i.e. transformer oil). Since the observation window structure in the oil transformer provided by the present application has the same structure as the above observation window structure, both can solve the same technical problems and achieve the same technical effects.

[0064] As Figure 8As shown, the top cover 11 has an outer wall surface 11a and an inner wall surface 11b opposite to each other, and the inner wall surface 11b and the second surface 2b both face the oil collecting cavity. The body 2 is arranged in the opening 111, or a mounting groove is arranged on the outer wall surface 11a and arranged on the outer periphery of the opening 111, and the body 2 is arranged in the mounting groove, so that the first surface 2a is flush with the outer wall surface 11a or closer to the inner wall surface 11b relative to the outer wall surface 11a. In other words, the above two mounting modes aim to make the first surface 2a flush with the outer wall surface 11a or lower than the outer wall surface 11a, so as to eliminate the height difference between the body 2 and the top cover 11, and since the oil is more likely to flow back to the oil collecting piece 1 than to accumulate on the outer periphery of the body 2, the possibility of oil retention is reduced, thereby reducing the risk of leakage and pollution. At the same time, by avoiding the accumulation of oil on the outer periphery of the body 2, the influence of corrosion and other environmental factors on the equipment can be reduced, thereby prolonging the service life of the equipment.

[0065] In some embodiments of the present application, the bottom of the oil collecting piece 1 is provided with a discharge structure for discharging the oil in the oil collecting piece 1 to the outside of the oil collecting piece 1. The discharge of the oil can be safely controlled through the discharge structure, the risk of oil overflow or leakage in the oil collecting piece 1 is reduced, and the safety of the operating environment is ensured.

[0066] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. In addition, the principles and implementation modes of the present application are described by applying specific examples in the specification, and the above description of the embodiments is only used to help understand the method and its core idea of the present application, and the content of the specification should not be understood as limiting the present application.

Claims

1. An observation window structure, characterized in that, An oil collecting device is used in an oil collecting component, wherein an oil collecting cavity is formed inside the oil collecting component for collecting oil, and an opening communicating with the oil collecting cavity is provided on the top cover of the oil collecting component, and an observation window structure is provided in the opening; The observation window structure includes a body and an oil leakage hole formed in the body. The body has a first surface and a second surface arranged opposite to each other, and the oil leakage hole is disposed through the first surface and the second surface.

2. The observation window structure according to claim 1, characterized in that, The oil leakage hole includes a plurality of first oil leakage holes arranged in an array, each of the first oil leakage holes penetrating the first surface and the second surface, and its hole wall is continuous and uninterrupted in the circumferential direction.

3. The observation window structure according to claim 1, characterized in that, The body also has a sidewall connecting the first surface and the second surface. The oil leakage hole includes a plurality of second oil leakage holes. The plurality of second oil leakage holes are disposed near the edge of the body. Each second oil leakage hole is disposed through the first surface, the second surface and the sidewall, and is at least partially connected to the opening.

4. The observation window structure according to claim 3, characterized in that, The body has intersecting first and second directions, both of which are parallel to the first surface. The body includes a first side and a second side disposed opposite to each other along the first direction, and a third side and a fourth side disposed opposite to each other along the second direction. The first side and the second side are each provided with the second oil leakage hole; and / or; The third side and the fourth side are each provided with the second oil leakage hole.

5. The observation window structure according to claim 3, characterized in that, When the body is stacked on the top cover, a portion of the orthographic projection of each of the second oil leakage holes on the top cover is located inside the opening, and another portion is located outside the opening.

6. The observation window structure according to claim 1, characterized in that, The oil leakage hole includes a tapered section, one port of which is located within the first surface. The flow area of ​​the tapered section gradually decreases from the first surface to the second surface.

7. The observation window structure according to claim 1, characterized in that, The overlapping area of ​​the oil leakage hole and the opening is greater than or equal to 3 square millimeters and less than or equal to 38.5 square millimeters.

8. The observation window structure according to claim 1, characterized in that, The main body is provided with a connecting part, and the main body is detachably connected to the top cover through the connecting part.

9. An oil-fired transformer, characterized in that, include: Transformer body; An oil collecting device, connected to the transformer body, is used to collect oil. as well as The observation window structure as described in any one of claims 1 to 8.

10. The oil-fired transformer according to claim 9, characterized in that, The top cover has an outer wall surface and an inner wall surface that are opposite to each other, and both the inner wall surface and the second surface face the oil collection cavity; The main body is disposed within the opening, or the outer wall surface is provided with a mounting groove, the mounting groove is disposed on the outer periphery of the opening, and the main body is disposed within the mounting groove; So that the first surface is flush with the outer wall surface or closer to the inner wall surface relative to the outer wall surface.

11. The oil-fired transformer according to claim 9, characterized in that, The bottom of the oil collecting component is provided with a discharge structure, which is used to discharge the oil inside the oil collecting component to the outside of the oil collecting component.

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