Transformer oil passage device used between large-capacity metal bellows oil conservator and transformer.

Abstract

A transformer oil passage device for use between a large-capacity corrugated metal conservator and a transformer includes a housing (1) installed on the large-capacity corrugated metal conservator, a cylindrical shell (2) installed between the housing (1) and the transformer, and a filter screen (4) installed on the cylindrical shell (2). Through the housing (1) and the cylindrical shell (2), a pipe body with an intermediate retention area is set between the large-capacity corrugated metal conservator and the transformer. Through the filter screen (4), the transformer oil is filtered, and the permeable transformer oil is placed in a state where particulate matter is actively retained. This solves the technical problem of using a straight pipe directly between the large-capacity corrugated metal conservator and the transformer as a channel for transformer oil, thus improving the reliability of the transformer.

Description

Technical Field

[0001] This utility model relates to a transformer oil passage device, and more particularly to a transformer oil passage device used between a large-capacity metal corrugated pipe oil conservator and a transformer. Background Technology

[0002] Transformer oil is a mineral oil obtained from natural petroleum through distillation and refining. It is a mixture of pure, stable, low-viscosity, highly insulating, and cooling liquid natural hydrocarbons obtained by acid and alkali refining of lubricating oil fractions from petroleum. It serves as an insulating, heat-dissipating, and arc-suppressing agent. Therefore, the transformer oil passage device used between the large-capacity metal bellows oil conservator and the transformer is an important transformer component. In existing transformer oil passage devices between the large-capacity metal bellows oil conservator and the transformer, straight pipes are still directly used as the channel for transformer oil. However, the metal bellows oil conservator compensates for changes in transformer oil volume through the expansion and contraction of the bellows. Long-term contact and friction between the bellows and the inner wall of the conservator can easily lead to paint peeling off the inner wall. The peeled paint may enter the transformer interior with the oil flow, causing a decrease in insulation performance or wear on mechanical parts, thus affecting the reliability of the transformer.

[0003] This invention, by incorporating the technical feature of placing the permeable transformer oil in a state of active particle retention, effectively explores and studies the technical problem of directly using straight pipes as channels for transformer oil between large-capacity corrugated metal oil tanks and transformers.

[0004] The statements herein provide only background information related to this utility model and do not necessarily constitute prior art. Based on the technical disclosure provided by the applicant on March 22, 2025, which addresses practical technical problems encountered during the work process, and the existing technical problems, technical features, and technical effects in similar patent documents and background information obtained through retrieval, the technical solution of this invention is proposed. Summary of the Invention

[0005] The subject of this utility model is a transformer oil passage device used between a large-capacity metal bellows oil tank and a transformer.

[0006] In order to overcome the above-mentioned technical shortcomings, the purpose of this utility model is to provide a transformer oil passage device for a large-capacity metal bellows oil tank and a transformer, thereby improving the reliability of the transformer.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a tank shell installed on a large-capacity metal corrugated pipe oil tank, a cylindrical shell installed between the tank shell and the transformer, and a filter screen installed on the cylindrical shell.

[0008] By incorporating a casing, a cylindrical shell, and a filter screen, a pipeline with an intermediate retention area is created between the large-capacity corrugated metal oil conservator and the transformer. The filter screen filters the transformer oil, ensuring that the permeable transformer oil is in a state where particulate matter is actively retained. This solves the technical problem of using straight pipes directly between the large-capacity corrugated metal oil conservator and the transformer as a channel for transformer oil, thus improving the reliability of the transformer.

[0009] This utility model is designed to connect the tank shell, cylinder shell and filter screen in a way that allows the permeable transformer oil to be in a state where the particles are actively retained.

[0010] This utility model designs a method of connecting the tank shell and cylinder shell to the filter screen by setting a pipe body with an intermediate retention area between the large-capacity metal corrugated pipe oil tank and the transformer.

[0011] The technical effects of the above three technical solutions are: highlighting the technical feature of making the permeable transformer oil in a state of active retention of particles, and introducing it into the technical field of transformer oil passage devices used between large-capacity metal bellows oil conservators and transformers.

[0012] This utility model is designed to include a first accessory device, which is disposed between the filter screen and the cylindrical shell, and the first accessory device is configured as an inlay hook.

[0013] The technical effect of the above technical solution is that it realizes the integrated installation of other components and expands the technical effect of this utility model.

[0014] This utility model is designed with a cylindrical shell inside the box shell, a filter screen on the cylindrical shell, and an inlay hook between the filter screen and the cylindrical shell.

[0015] The technical effect of the above technical solution is that the basic technical solution of this utility model is formed by the box shell, the cylindrical shell, the inlay hook and the filter screen, which solves the technical problem of this utility model.

[0016] This utility model designs a box-shaped body with an open upper end and a through hole in the middle of the bottom wall at the lower end. The through hole of the box is connected to a cylindrical shell. The inner wall of the through hole of the box is welded to the cylindrical shell. The box is connected to the inner end of the cylindrical shell in a receiving manner. The open upper end of the box is connected to a large-capacity metal corrugated pipe oil tank in a communicating manner.

[0017] The technical effect of the above solution is that it enables the port of the cylindrical shell to be accommodated and supported.

[0018] This utility model is designed with a cylindrical shell comprising a cylindrical part and a disc part. The inner end of the cylindrical part is connected to the middle of the disc part through a central connection. The inner end of the outer peripheral side of the cylindrical part is connected to the disc part, and the outer end of the inner wall of the cylindrical part is welded to an inlay hook. The outer port of the cylindrical part is connected to a filter screen in contact, and the outer end of the outer peripheral side of the cylindrical part is connected to an inlay hook in contact. The outer end of the cylindrical part is connected to the housing through a central connection, and the inner end of the outer peripheral side of the cylindrical part is welded to the housing. The outer end face of the disc part is connected to a transformer.

[0019] This utility model is designed with a cylindrical part configured as a tubular body and a disc part configured as a seat-shaped body with a central through hole, wherein the central through hole of the disc part is configured to be connected to the cylindrical part.

[0020] The technical effect of the above two solutions is that they enable the flow of transformer oil through pipes.

[0021] This utility model designs a filter screen comprising a ring portion I, a ring portion II, and a mesh portion, wherein one end edge of the mesh portion is connected to the inner end face of the ring portion I, and the other end edge of the mesh portion is connected to the inner end face of the ring portion II. The ring portion I, the ring portion II, and the mesh portion are respectively connected to the inlay hook in a sleeve-type connection. The outer end face of the ring portion I is connected to the inlay hook in a contact-type connection, and the outer end face of the ring portion II is connected to the cylindrical shell in a contact-type connection.

[0022] The present invention is designed such that the ring part I and the ring part II are respectively set as annular bodies and the mesh part is set as a metal mesh.

[0023] The technical effect of the above two solutions is that they achieve edge support for a double-ring body.

[0024] This utility model designs an inlay hook comprising hook part I, hook part II, and hook part III. The curved bodies of hook part I, hook part II, and hook part III are respectively configured to be connected to the filter screen through the filter screen. The inner ends of hook part I, hook part II, and hook part III are respectively configured to be welded to the cylindrical shell. The outer ends of hook part I, hook part II, and hook part III are respectively configured to be connected to the cylindrical shell in contact.

[0025] This utility model is designed such that hook I, hook II and hook III are respectively set as U-shaped rods and are arranged at intervals along the periphery of the cylindrical shell.

[0026] The technical effect of the above two solutions is that they enable the U-shaped rod to install the filter screen.

[0027] This utility model is designed such that the box shell, cylindrical shell and filter screen are arranged in a mesh filtration manner, and the box shell, cylindrical shell and filter screen are arranged in a hook connection manner.

[0028] This utility model is designed such that the center lines of the housing, the cylindrical housing, and the filter screen are all on the same straight line, and hook I, hook II, and hook III are respectively configured to connect with the cylindrical part, ring I, ring II, and the screen part.

[0029] The present invention is designed such that the height h between the outer port of the cylindrical part and the bottom wall of the lower end of the box shell is set to 100-240mm.

[0030] In this technical solution, the box shell, the cylindrical shell, and the filter screen are the basic components and the necessary technical features of this utility model. The inlaid hook is a functional component and is a feature that realizes other technical effects of this utility model. The design of these technical features, such as the cylindrical part, the disc part, hook part I, hook part II, hook part III, ring part I, ring part II, and the mesh part, are technical features that comply with the Patent Law and its implementing regulations.

[0031] In this technical solution, the process of actively retaining particulate matter in the transformer oil is achieved by the tank shell and the filter screen.

[0032] In this technical solution, the key technical feature is that the transformer oil is in a state of active retention of particles in the tank shell, cylinder shell, and filter screen. In the technical field of transformer oil passage device between large-capacity metal bellows oil tank and transformer, it has novelty, inventiveness, and practicality. The terminology in this technical solution can be explained and understood using patent literature in this technical field. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of one of the first embodiments of the present utility model.

[0035] Figure 2 for Figure 1 Top view,

[0036] Figure 3 This is a schematic diagram of the structure of filter screen 4.

[0037] Box shell-1, cylindrical shell-2, inlaid hook-3, filter screen-4, cylindrical part-21, disc part-22, hook part I-31, hook part II-32, hook part III-33, ring part I-41, ring part II-42, mesh part-43. Detailed Implementation

[0038] According to the examination guidelines, terms such as “having,” “comprising,” and “including” used in this invention should be understood as not dispensing the presence or addition of one or more other elements or combinations thereof.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following embodiments are commercially available. Unless otherwise specified, please make improvements according to conventional methods in the field.

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Figure 1As one of the first embodiments of this utility model, this embodiment is described in detail with reference to the accompanying drawings. It includes a box shell 1, a cylindrical shell 2, an inlay hook 3 and a filter screen 4. The cylindrical shell 2 is disposed in the box shell 1, the filter screen 4 is disposed on the cylindrical shell 2, and the inlay hook 3 is disposed between the filter screen 4 and the cylindrical shell 2.

[0044] The second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0045] In this embodiment, the housing 1 is configured as a box-shaped body with an open upper end and a through hole in the middle of the bottom wall at the lower end. The through hole of the housing 1 is configured to be connected to the cylindrical shell 2. The inner wall of the through hole of the housing 1 is configured to be welded to the cylindrical shell 2. The housing 1 is configured to be connected to the inner end of the cylindrical shell 2 in a receiving manner. The open upper end of the housing 1 is configured to be connected to the large-capacity metal corrugated pipe oil tank in a communicating manner.

[0046] The housing 1 forms a support connection point for the cylindrical shell 2, and the housing 1 enables the connection with the cylindrical shell 2. Its technical purpose is to serve as a component for connecting with a large-capacity metal corrugated pipe oil tank.

[0047] In this embodiment, the cylindrical shell 2 is configured to include a cylindrical portion 21 and a disc portion 22, with the inner end of the cylindrical portion 21 being connected to the middle of the disc portion 22 through the middle, the inner end of the outer peripheral side of the cylindrical portion 21 being connected to the disc portion 22, and the outer end of the inner wall of the cylindrical portion 21 being welded to the inlay hook 3, the outer port of the cylindrical portion 21 being connected to the filter screen 4 in contact, and the outer end of the outer peripheral side of the cylindrical portion 21 being connected to the inlay hook 3 in contact, the outer end of the cylindrical portion 21 being connected to the housing 1 through the middle, and the inner end of the outer peripheral side of the cylindrical portion 21 being welded to the housing 1, and the outer end face of the disc portion 22 being connected to the transformer.

[0048] The cylindrical shell 2 forms a support connection point for the housing 1, the inlay hook 3, and the filter screen 4. The cylindrical part 21 realizes the connection with the housing 1, the connection with the inlay hook 3, and the connection with the filter screen 4. The disc part 22 realizes the connection with the transformer. Its technical purpose is to serve as a component for connecting with the transformer.

[0049] In this embodiment, the cylindrical portion 21 is configured as a tubular body and the disc portion 22 is configured as a seat-like body with a central through hole, and the central through hole of the disc portion 22 is configured to be connected to the cylindrical portion 21.

[0050] Its technical purpose is to achieve tube-to-tube connection with the transformer.

[0051] In this embodiment, the inlay hook 3 is configured to include hook part I 31, hook part II 32 and hook part III 33, and the curved body of hook part I 31, hook part II 32 and hook part III 33 are respectively configured to be connected to the filter screen 4 through the filter screen. The inner end of hook part I 31, hook part II 32 and hook part III 33 are respectively configured to be connected to the cylindrical shell 2 by welding, and the outer end of hook part I 31, hook part II 32 and hook part III 33 are respectively configured to be connected to the cylindrical shell 2 by contact.

[0052] By inlaying hook 3, a support connection point for the cylindrical shell 2 and the filter screen 4 is formed. The connection with the cylindrical shell 2 and the filter screen 4 is realized by hook part I 31, hook part II 32 and hook part III 33. Its technical purpose is to serve as a component for connecting the filter screen 4 and the cylindrical shell 2.

[0053] In this embodiment, hook I 31, hook II 32 and hook III 33 are respectively configured as U-shaped rods and are arranged at intervals along the periphery of the cylindrical shell 2.

[0054] Its technical purpose is to achieve a hook connection between the filter screen 4 and the cylindrical shell 2.

[0055] In this embodiment, the filter screen 4 is configured to include a ring portion I 41, a ring portion II 42, and a mesh portion 43. One end edge of the mesh portion 43 is configured to be connected to the inner end face of the ring portion I 41, and the other end edge of the mesh portion 43 is configured to be connected to the inner end face of the ring portion II 42. The ring portion I 41, the ring portion II 42, and the mesh portion 43 are respectively configured to be connected to the inlay hook 3 in a sleeve manner. The outer end face of the ring portion I 41 is configured to be connected to the inlay hook 3 in a contact manner, and the outer end face of the ring portion II 42 is configured to be connected to the cylindrical shell 2 in a contact manner.

[0056] The filter screen 4 forms a support connection point for the cylindrical shell 2 and the inlay hook 3. The connection with the cylindrical shell 2 is achieved by the ring part II 42, and the connection with the inlay hook 3 is achieved by the ring part I 41, the ring part II 42 and the mesh part 43. Its technical purpose is to serve as a component for filtering transformer oil flowing from a large-capacity metal bellows oil tank to the transformer.

[0057] In this embodiment, the ring portion I 41 and the ring portion II 42 are respectively configured as annular bodies and the mesh portion 43 is configured as a metal mesh.

[0058] Its technical objective is to enable the perforated filtration treatment of transformer oil flowing from a large-capacity metal bellows oil tank to the transformer.

[0059] In this embodiment, the housing 1 and the cylindrical housing 2 are arranged to filter the filter screen 4 in a mesh-like manner, and the housing 1, the cylindrical housing 2, and the filter screen 4 are arranged to connect the inlay hook 3 in a hook-like manner. The center lines of the housing 1, the cylindrical housing 2, and the filter screen 4 are arranged on the same straight line. Hook I 31, hook II 32, and hook III 33 are respectively connected to the cylindrical part 21, the ring part I 41, the ring part II 42, and the mesh part 43.

[0060] In this embodiment, the height h between the outer port of the cylindrical part 21 and the bottom wall of the lower end of the housing 1 is set to 100-240mm.

[0061] In one of the supporting examples of the first embodiment of this utility model, the height h between the outer port of the cylindrical part 21 and the bottom wall of the lower end of the housing 1 is set to 100mm.

[0062] In the second supporting example of the first embodiment of this utility model, the height h between the outer port of the cylindrical part 21 and the bottom wall of the lower end of the housing 1 is set to 240mm.

[0063] In the third supporting example of the first embodiment of this utility model, the height h between the outer port of the cylindrical part 21 and the bottom wall of the lower end of the housing 1 is set to 170mm.

[0064] The method of use in this embodiment is as follows: Install the outer end of the cylindrical part 21 into the through hole of the housing 1, weld the inner wall of the through hole of the housing 1 to the inner side of the outer periphery of the cylindrical part 21, place the hook part I 31, hook part II 32 and hook part III 33 on the cylindrical part 21, and arrange the hook part I 31, hook part II 32 and hook part III 33 at intervals along the periphery contour line of the cylindrical part 21, and place the inner end of the blank straight rod of hook part I 31, the inner end of the blank straight rod of hook part II 32 and the hook part The inner ends of the blank straight rods of III33 are welded to the outer ends of the inner walls of the cylinder 21, thereby connecting the box shell 1, the cylinder shell 2, and the insert hook 3 together. The interiors of the box shell 1 and the cylinder shell 2, the insert hook 3, and the filter screen 4 are painted. After the paint layer on the interiors of the box shell 1 and the cylinder shell 2, the insert hook 3, and the filter screen 4 has dried, the ring part I 41, the ring part II 42, and the mesh part 43 are fitted onto the outer ends of the blank straight rods of hook part I 31 and hook part II 32. On the outer end of the rod and the outer end of the straight rod of hook part Ⅲ33, the outer end face of ring part Ⅱ42 is brought into contact with the outer port of cylinder part 21, causing the outer ends of the straight rods of hook part Ⅰ31, hook part Ⅱ32, and hook part Ⅲ33 to bend, so that the bent body of hook part Ⅰ31, hook part Ⅱ32, and hook part Ⅲ33 contacts the outer end face of ring part Ⅰ41, causing the outer ends of hook part Ⅰ31, hook part Ⅱ32, and hook part Ⅲ33 to contact the outer end face of ring part Ⅰ41. The outer end of hook Ⅲ33 contacts the outer end of the peripheral outer side of cylinder 21, thereby installing filter screen 4 on cylinder shell 2, connecting the upper opening of the housing 1 to the large-capacity metal corrugated pipe oil conservator, and connecting the outer end face of plate 22 to the transformer. When transformer oil in the large-capacity metal corrugated pipe oil conservator flows to the transformer, the mesh part 43 filters out impurities such as paint flakes in the transformer oil and retains them in the housing 1, preventing impurities such as paint flakes from entering the transformer.

[0065] In verifying this utility model, the inventors abandoned the existing technical feature of directly using a straight pipe between the large-capacity metal corrugated oil tank and the transformer as a channel for transformer oil. Instead, they first proposed a technical feature that actively retains particulate matter in the permeable transformer oil, resulting in the first unexpected technical effect: achieving filtration-like removal of particulate impurities from the transformer oil, thus improving the purity of the transformer oil in the transformer. The second unexpected technical effect: enabling the tank shell 1 to retain and store particulate impurities in the transformer oil, increasing the storage space for particulate impurities. The third unexpected effect... Technical effects: It enables direct flow of transformer oil through the shell 2, improving the flow performance of transformer oil into the transformer. A fourth unexpected technical effect is achieved: It enables the filter screen 4 to filter particulate impurities in the transformer oil, improving the installation support strength of the screen part 43 and enhancing the filtration performance of particulate impurities in the transformer oil. A fifth unexpected technical effect is achieved: It enables the installation of the filter screen 4 on the shell 2 via the embedded hook 3, optimizing the painting operation of the housing 1, shell 2, and embedded hook 3, improving the painting effect of the housing 1, shell 2, and embedded hook 3, and reducing the interference factors of metal bodies on the transformer oil.

[0066] In the second embodiment of this utility model, the tank shell 1, the cylindrical shell 2 and the filter screen 4 are connected to each other in a manner that allows the permeable transformer oil to be in a state where the particles are actively retained.

[0067] In this embodiment, the tank shell 1 and the cylindrical shell 2 are connected to the filter screen 4 by means of a pipe body with an intermediate retention area between the large-capacity metal corrugated oil tank and the transformer.

[0068] In this embodiment, a first accessory device is also included and is disposed between the filter screen 4 and the cylindrical shell 2. The first accessory device is configured as an insert hook 3.

[0069] The second embodiment of this utility model is based on the first embodiment.

[0070] This utility model has the following features:

[0071] 1. Due to the design of the housing 1, the cylindrical shell 2, and the filter screen 4, a pipeline with an intermediate retention area is set between the large-capacity metal corrugated oil conservator and the transformer through the housing 1 and the cylindrical shell 2. The filter screen 4 is used to filter the transformer oil, so that the permeable transformer oil is in a state of active retention of particles. This solves the technical problem of using a straight pipe as a channel for transformer oil between the large-capacity metal corrugated oil conservator and the transformer, thus improving the reliability of the transformer.

[0072] 2. Due to the design of the inlay hook 3, the connection between the cylindrical shell 2 and the filter screen 4 is realized.

[0073] 3. By designing the height h between the outer port of the cylinder 21 and the bottom wall of the lower end of the casing 1, the storage of granules is achieved.

[0074] 4. Because the design limits the numerical range of the structural shape, the numerical range is a technical feature in the technical solution of this utility model, and is not a technical feature obtained by formula calculation or a limited number of experiments. The experiment shows that the technical feature of the numerical range has achieved very good technical effect.

[0075] 5. Due to the design of the technical features of this utility model, and the combined effect of the individual and collective technical features, experiments have shown that the performance indicators of this utility model are at least 1.7 times that of existing performance indicators, and it has been evaluated that it has great market value.

[0076] Other technical features that connect the tank shell 1, cylinder shell 2, and filter screen 4 to the transformer oil in a state where the particles are actively retained are also embodiments of this utility model. Furthermore, the technical features of the above embodiments can be combined in any way. In order to meet the requirements of the Patent Law, the Patent Implementation Regulations, and the Examination Guidelines, all possible combinations of the technical features in the above embodiments will not be described.

[0077] Therefore, in the technical field of transformer oil passage devices used between large-capacity metal corrugated pipe oil conservators and transformers, all technical contents including the tank shell 1 installed on the large-capacity metal corrugated pipe oil conservator, the cylindrical shell 2 installed between the tank shell 1 and the transformer, and the filter screen 4 installed on the cylindrical shell 2 are within the protection scope of this utility model.

Claims

1. A device for the passage of transformer oil between a large volume metal bellows oil reservoir and a transformer, characterised in that: It includes a tank shell (1) installed on a large-capacity metal corrugated pipe oil tank, a cylindrical shell (2) installed between the tank shell (1) and the transformer, and a filter screen (4) installed on the cylindrical shell (2). The tank shell (1), cylinder shell (2) and filter screen (4) are connected to each other in a way that allows the permeable transformer oil to be in a state where the particles are actively retained.

2. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer according to claim 1, characterized in that: The tank shell (1) and cylinder shell (2) are connected to the filter screen (4) by setting a pipe body with an intermediate retention area between the large-capacity metal corrugated oil tank and the transformer.

3. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer according to claim 1, characterized in that: It also includes a first accessory device and the first accessory device is disposed between the filter screen (4) and the cylindrical shell (2), and the first accessory device is configured as an insert hook (3).

4. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer according to claim 3, characterized in that: A cylindrical shell (2) is provided in the casing (1), a filter screen (4) is provided on the cylindrical shell (2), and an insert hook (3) is provided between the filter screen (4) and the cylindrical shell (2).

5. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer according to claim 4, characterized in that: The housing (1) is configured as a box-shaped body with an open upper end and a through hole in the middle of the bottom wall at the lower end. The through hole of the housing (1) is configured to be connected to the cylindrical shell (2). The inner wall of the through hole of the housing (1) is configured to be welded to the cylindrical shell (2). The housing (1) is configured to be connected to the inner end of the cylindrical shell (2) in a receiving manner. The open upper end of the housing (1) is configured to be connected to the large-capacity metal corrugated pipe oil storage tank in a communicating manner. Alternatively, the shell (2) is configured to include a cylindrical section (21) and a disc section (22), with the inner end of the cylindrical section (21) being connected to the middle of the disc section (22) through the middle, the inner end of the outer periphery of the cylindrical section (21) being connected to the disc section (22), and the outer end of the inner wall of the cylindrical section (21) being welded to the inlay hook (3), the outer port of the cylindrical section (21) being connected to the filter screen (4), and the outer end of the outer periphery of the cylindrical section (21) being connected to the inlay hook (3), the outer end of the cylindrical section (21) being connected to the housing (1) through the middle, and the inner end of the outer periphery of the cylindrical section (21) being welded to the housing (1), and the outer end face of the disc section (22) being connected to the transformer. Alternatively, the cylindrical part (21) is configured as a tubular body and the disc part (22) is configured as a seat-like body with a central through hole, wherein the central through hole of the disc part (22) is configured to be connected to the cylindrical part (21).

6. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer according to claim 4, characterized in that: The filter screen (4) is configured to include a ring part I (41), a ring part II (42), and a mesh part (43). One end edge of the mesh part (43) is configured to be connected to the inner end face of the ring part I (41), and the other end edge of the mesh part (43) is configured to be connected to the inner end face of the ring part II (42). The ring part I (41), the ring part II (42), and the mesh part (43) are respectively configured to be connected to the insert hook (3) in a sleeve-type manner. The outer end face of the ring part I (41) is configured to be connected to the insert hook (3) in a contact-type manner, and the outer end face of the ring part II (42) is configured to be connected to the cylindrical shell (2) in a contact-type manner. Alternatively, the ring part I (41) and the ring part II (42) are respectively set as annular bodies and the mesh part (43) is set as a metal mesh.

7. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer of claim 4, wherein: The inlay hook (3) is configured to include hook part I (31), hook part II (32) and hook part III (33), and the curved body of hook part I (31), the curved body of hook part II (32) and the curved body of hook part III (33) are respectively configured to be connected to the filter screen (4) through the filter screen. The inner end of hook part I (31), the inner end of hook part II (32) and the inner end of hook part III (33) are respectively configured to be connected to the cylindrical shell (2) by welding. The outer end of hook part I (31), the outer end of hook part II (32) and the outer end of hook part III (33) are respectively configured to be connected to the cylindrical shell (2) by contact. Alternatively, hook I (31), hook II (32) and hook III (33) are respectively set as U-shaped rods and hook I (31), hook II (32) and hook III (33) are arranged at intervals along the periphery of the cylindrical shell (2).

8. The device for transformer oil passage between a large volume metal bellows reservoir and a transformer according to any one of claims 1 to 7, characterized in that: The box shell (1) and cylindrical shell (2) are arranged with the filter screen (4) in a mesh filtering manner, and the box shell (1), cylindrical shell (2) and filter screen (4) are arranged with the inlay hook (3) in a hook connection manner. Alternatively, the center lines of the housing (1), the cylindrical housing (2), and the filter screen (4) are set on the same straight line, and the hook part I (31), hook part II (32), and hook part III (33) are respectively set to connect with the cylindrical part (21), the ring part I (41), the ring part II (42), and the screen part (43).

9. The device for passage of transformer oil between a large volume metal bellows reservoir and a transformer according to claim 8, characterized in that: The height h between the outer port of the cylindrical part (21) and the bottom wall of the lower end of the casing (1) is set to 100-240mm.

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