Emergency tank system

Abstract

To provide an emergency tank device for insulating oil in transformers that can improve work efficiency during manufacturing. [Solution] An emergency tank device 100 for storing insulating oil supplied from a transformer 200 via an oil supply pipe 202, comprising an oil tank section 10 and a lid section 20 covering the opening of the oil tank section 10, comprising a relay pipe 30 having one end communicating with the oil tank section 10 and the other end connected to the oil supply pipe 202 via a through hole formed in the lid section 20, a hollow plate section provided around the outer surface of the relay pipe 30, a cylindrical section provided on the lower surface of the hollow plate section and extending to a position above the lid section, a mesh section 50 surrounding the outer surface of the cylindrical section and sealing the gap between the cylindrical section and the lid section 20, and a band member 60 fitted onto the mesh section 50 and pressing the mesh section 50 against the cylindrical section.

Description

Technical Field

[0001] The present invention relates to an emergency tank device for insulating oil of a transformer.

Background Art

[0002] In a transformer, in an emergency such as a short circuit, the insulating oil (hereinafter referred to as insulating oil) in the transformer is overheated to generate gas, and due to the increase in such gas pressure, there is a risk that the insulating oil leaks outside the transformer. To prepare for such an emergency, in addition to a conservator, an emergency tank device for temporarily transferring and storing the insulating oil in the transformer is connected to the transformer. That is, the emergency tank device is connected to the transformer via an oil delivery pipe, and insulating oil is sent from the transformer in an emergency.

[0003] For example, Patent Document 1 describes that by placing the emergency tank device on the upper part of the tank of the transformer, space can be saved and the transformer can be made more compact.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above emergency tank device, insulating oil is sent from the transformer via an oil delivery pipe. When there is a gap between the tip of the oil delivery pipe and the oil filling port of the oil tank part of the emergency tank device, in order to prevent insects and the like from entering the tank part, it is necessary to block such a gap with a net member. Specifically, an attachment operation is performed to fix the net member to the oil delivery pipe, for example, by screwing.

[0006] However, the aforementioned installation process requires screwing the oil supply pipe in multiple locations around its circumference. Furthermore, if the screw holes in the oil supply pipe overlap with the wire portion of the mesh member, the wire portion may be forcibly deformed in order to screw it in, potentially leading to damage to the mesh member. The emergency tank device described in Patent Document 1 does not address these problems and therefore cannot be used to solve them.

[0007] This invention has been made in view of the above circumstances, and aims to provide an emergency tank device for insulating oil in transformers that can improve workability during manufacturing. [Means for solving the problem]

[0008] The emergency tank device according to the present invention comprises an oil tank section and a lid section that covers the opening of the oil tank section, and is an emergency tank device for storing insulating oil supplied from a transformer via an oil supply pipe, and comprises a relay pipe having one end communicating with the oil tank section and the other end connected to the oil supply pipe via a through hole formed in the lid section, a hollow plate section provided around the outer surface of the relay pipe, a cylindrical section provided on the lower surface of the hollow plate section and extending to a position above the lid section, a mesh section surrounding the outer surface of the cylindrical section and sealing the gap between the cylindrical section and the lid section, and a band member fitted onto the mesh section and pressing the mesh section against the cylindrical section. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an emergency tank device for insulating oil in transformers that can improve work efficiency during manufacturing. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an emergency tank device according to Embodiment 1 of the present invention. [Figure 2] This figure shows the lid portion of the emergency tank device according to Embodiment 1. [Figure 3] This figure shows the relay pipe and cover section of the emergency tank device according to Embodiment 1. [Figure 4]This is a longitudinal cross-sectional view of the emergency tank device according to Embodiment 1. [Figure 5] This is a perspective view showing the cover and mesh portions of the emergency tank device according to Embodiment 2. [Modes for carrying out the invention]

[0011] A transformer has insulating oil stored inside, and is equipped with an emergency tank device for transferring this insulating oil in an emergency. For example, in an emergency such as when the gas pressure inside the transformer suddenly increases due to a short circuit, the insulating oil is sent to the emergency tank device. This invention relates to such an emergency tank device. The present invention will be described below with reference to the drawings illustrating its embodiments.

[0012] (Embodiment 1) Figure 1 shows an emergency tank device 100 according to Embodiment 1 of the present invention. For convenience, Figure 1 shows the emergency tank device 100 attached to a transformer 200, and some parts of the transformer 200 are omitted from the illustration.

[0013] The emergency tank device 100 according to Embodiment 1 comprises an oil tank section 10, a lid section 20, a relay pipe 30, a cover section 40, and a mesh section 50. An oil supply pipe 202 is connected to the transformer 200, and the emergency tank device 100 is attached to the transformer 200. The emergency tank device 100 is connected to the transformer 200 via the relay pipe 30 and the oil supply pipe 202.

[0014] The oil tank section 10 is fixed to the side wall of the transformer 200, and its upper opening is covered by a lid section 20. The oil tank section 10 is in communication with the oil supply pipe 202 via a relay pipe 30.

[0015] The oil tank part 10 is made of metal and has a bottomed cylindrical tank part 101. In the tank part 101, the upper side is open and a circular opening is formed. The upper end part of the tank part 101 is bent outward of the oil tank part 10 in the radial direction of the tank part 101, and the flange part 103 is formed. A plurality of through holes 104 are formed in the flange part 103 at equal intervals in the circumferential direction. **During the above-mentioned emergency**, insulating oil is sent from the transformer 200 to the emergency tank device 100 through the oil delivery pipe 202 and stored in the tank part 101.

[0016] In addition, the oil tank part 10 is provided with mounting brackets 11 on the outer peripheral surface of the tank part 101. The mounting brackets 11 are made of metal, and two mounting brackets 11 are provided at intervals in the vertical direction. Each mounting bracket 11 projects outward from the outer peripheral surface of the tank part 101 in the radial direction of the tank part 101, that is, in a direction orthogonal to the axial direction of the tank part 101. The protruding end part of the mounting bracket 11 is bent downward and screwed to the fixture 201 of the transformer 200. Thereby, the tank part 101 (emergency tank device 100) is fixed to the transformer 200.

[0017] FIG. 2 is a view showing the lid part 20 of the emergency tank device 100 according to Embodiment 1. FIG. 2A is a plan view of the lid part 20, and FIG. 2B is a side view of the lid part 20.

[0018] The lid part 20 is made of metal like the oil tank part 10 and covers the opening of the tank part 101. The lid part 20 has a lid body 24 having a flat disc shape and a surrounding part 22, and through holes 21 are formed in the lid body 24.

[0019] The diameter of the lid body 24 is slightly larger than the diameter of the opening of the tank part 101 and is the same as the outer diameter of the flange part 103 of the tank part 101. A plurality of bolt holes 23 are formed at equal intervals in the circumferential direction at the edge of the lid body 24. The bolt holes 23 are through holes penetrating the lid body 24 in the thickness direction and are formed at positions corresponding to the through holes 104 of the tank part 101 (flange part 103) (see FIG. 1).

[0020] That is, the lid 24 is disposed on the same axis as the oil tank portion 10 (tank portion 101). A bolt is inserted into the bolt hole 23 of the lid 24 and the through hole 104 of the tank portion 101 and tightened with a nut, and the lid portion 20 is fixed to the oil tank portion 10. An O-ring R (see FIG. 1) is interposed between the edge of the lid 24 and the flange portion 103 of the tank portion 101.

[0021] The through hole 21 is circular and penetrates the lid 24 in the thickness direction. It is formed at a position offset from the center of the lid 24 and near the edge of the lid 24. Specifically, the through hole 21 is formed at the edge of the lid 24, at a position near the transformer 200. Further, at the lower end of the edge related to the through hole 21, a rib 25 extending downward is provided along the through hole 21.

[0022] Further, on the upper surface of the lid 24, a surrounding portion 22 protrudes so as to surround the through hole 21. Specifically, on the upper surface of the lid 24, at a position separated from the through hole 21 in the radial direction of the through hole 21, a surrounding portion 22 extending upward is provided. In other words, the surrounding portion 22 has a cylindrical shape with an inner diameter slightly larger than the diameter of the through hole 21 and surrounds the through hole 21. For example, the surrounding portion 22 is made of the same metal as the lid 24 and is welded to the upper surface of the lid 24.

[0023] FIG. 3 is a diagram showing the relay pipe 30 and the cover portion 40 of the emergency tank device 100 according to Embodiment 1. FIG. 3A is a plan view of the relay pipe 30, and FIG. 3B is a side view of the relay pipe 30 and the cover portion 40. For convenience of explanation, FIG. 3B shows a half-cut cross-sectional view of the relay pipe 30 and the cover portion 40.

[0024] The relay pipe 30 has a cylindrical portion 31, and the cover portion 40 is attached to the cylindrical portion 31. The cylindrical portion 31 of the relay pipe 30 is made of metal and has a cylindrical shape with the axial direction being the vertical direction. One upper end portion of the cylindrical portion 31 is connected to the end portion of the oil supply pipe 202 of the transformer 200 (see FIG. 1). Further, the other lower end portion of the cylindrical portion 31 opens toward the inside of the oil tank portion 10 in the vicinity of the through hole 21 of the lid portion 20.

[0025] Figure 4 is a longitudinal cross-sectional view of the emergency tank device 100 according to Embodiment 1. For convenience, only a portion of the oil tank section 10 is shown in Figure 4.

[0026] The other end of the cylindrical portion 31 is inserted into the surrounding portion 22 such that the axial direction of the cylindrical portion 31 is the direction of penetration of the through hole 21. The other end of the cylindrical portion 31 is positioned near the through hole 21 and communicates with the inside of the oil tank portion 10 through the through hole 21 of the lid portion 20.

[0027] The outer diameter of the cylindrical portion 31 is smaller than the inner diameter of the surrounding portion 22 of the lid portion 20, and also smaller than the diameter of the through hole 21. Therefore, a certain gap is formed between the lower end of the cylindrical portion 31 and the edge related to the through hole 21 (see Figure 4).

[0028] In the cylindrical portion 31, one upper end is bent outward in the radial direction of the cylindrical portion 31, forming a connecting flange 32. That is, as shown in Figure 3, the connecting flange 32 has a hollow disc shape in plan view. Four connecting bolt holes 33 are formed in the connecting flange 32 at equal intervals in the circumferential direction.

[0029] The intermediate pipe 30 is positioned on the same axis as the oil supply pipe 202 of the transformer 200. The intermediate pipe 30 is connected to the end of the oil supply pipe 202 by inserting bolts into connecting bolt holes 33 of the connecting flange 32 and through holes (not shown) in the flange at the lower end of the oil supply pipe 202 and tightening them with nuts. An O-ring R is interposed between the connecting flange 32 and the flange at the lower end of the oil supply pipe 202. Therefore, the intermediate pipe 30 is detachable from the oil supply pipe 202.

[0030] As described above, a cover portion 40 is attached to the cylindrical portion 31 of the relay pipe 30. The cover portion 40 is provided on the outer circumferential surface of the cylindrical portion 31 and covers the through hole 21 (upper side of the surrounding portion 22) of the lid portion 20. The cover portion 40 has a hollow plate portion 42 and a cylindrical portion 41.

[0031] The hollow plate portion 42 is a flat disc shape with a through hole in the center, and is provided around the outer surface of the cylindrical portion 31 of the relay pipe 30 so as to face the through hole 21 and surrounding portion 22 of the lid portion 20 in the vertical direction. More specifically, the hollow plate portion 42 is provided around the cylindrical portion 31 in the radial direction, outward, at the middle of the outer surface of the cylindrical portion 31 in the vertical direction.

[0032] In other words, the hollow plate portion 42 is a hollow disc shape in plan view and is fitted onto the cylindrical portion 31. The dimension of the hollow plate portion 42 from the base to the tip is constant in the circumferential direction of the hollow plate portion 42, and the outer diameter of the hollow plate portion 42 is larger than the outer diameter of the surrounding portion 22 of the lid portion 20. The hollow plate portion 42 is attached to the cylindrical portion 31, for example, by welding or riveting.

[0033] The cylindrical portion 41 is located on the lower surface 421 of the hollow plate portion 42, is circumferentially positioned around the edge of the hollow plate portion 42, and extends downward to a position above the upper surface of the lid 24 of the lid portion 20. That is, the cylindrical portion 41 is cylindrical in shape and is provided on the lower surface 421 of the hollow plate portion 42 with its axial direction being vertical. Therefore, a gap G is formed between the lower end of the cylindrical portion 41 and the upper surface of the lid 24. The outer diameter of the cylindrical portion 41 is smaller than the outer diameter of the hollow plate portion 42. Therefore, the edge of the hollow plate portion 42 protrudes outward from the cylindrical portion 41 in the radial direction of the hollow plate portion 42. The cylindrical portion 41 and the hollow plate portion 42 are integrally formed.

[0034] The dimension of the cylindrical portion 41 from its upper end to its lower end is constant in the circumferential direction, and the inner diameter of the cylindrical portion 41 is larger than the outer diameter of the surrounding portion 22. That is, the cylindrical portion 41 is positioned outside the surrounding portion 22. The lower end of the cylindrical portion 41 is located above the upper surface of the lid 24 and below the upper end of the surrounding portion 22 (see Figure 4). In other words, the surrounding portion 22 and the cylindrical portion 41 partially overlap in the radial direction of the cylindrical portion 41, or in the radial direction of the surrounding portion 22.

[0035] The upper end of the surrounding portion 22 is positioned below the hollow plate portion 42 of the cover portion 40, and the lower end of the cylindrical portion 41 is positioned above the lid 24 of the lid portion 20. Also, as described above, the other end of the cylindrical portion 31 is positioned near the through hole 21. Therefore, the upper end of the surrounding portion 22 is higher than the lower ends of the cylindrical portion 41 and the cylindrical portion 31.

[0036] As described above, the cylindrical portion 41 is positioned outside the surrounding portion 22, and the cylindrical portion 31 (lower end) of the relay pipe 30 is positioned inside the surrounding portion 22. Therefore, a gap is formed between the surrounding portion 22 and the cylindrical portion 31, and a gap is also formed between the surrounding portion 22 and the cylindrical portion 41. That is, the surrounding portion 22 is positioned between the cylindrical portion 41 and the cylindrical portion 31, and the gap between the surrounding portion 22 and the cylindrical portion 41 is almost the same size as the gap between the surrounding portion 22 and the cylindrical portion 31 (see Figure 4).

[0037] A mesh portion 50 is fitted onto the outer circumferential surface of the cylindrical portion 41 of the cover portion 40 (see Figures 1 and 4). That is, the mesh portion 50 surrounds the outer circumferential surface of the cylindrical portion 41 and has a cylindrical shape. The mesh portion 50 is made of, for example, expanded metal, and the lower end of the mesh portion 50 is in contact with the upper surface of the lid 24 of the lid portion 20, sealing the gap G between the cylindrical portion 41 and the upper surface of the lid 24.

[0038] A band member 60 is wound endlessly around the outer circumferential surface of the mesh portion 50. That is, the band member 60 is fitted onto the mesh portion 50. The band member 60 is, for example, a strip-shaped steel band, and it fixes the mesh portion 50 to the cylindrical portion 41 by pressing it against the cylindrical portion 41. The band member 60 is positioned at a location corresponding to the upper part of the cylindrical portion 41, that is, on the outer circumferential surface of the cylindrical portion 41, closer to the hollow plate portion 42.

[0039] With the above configuration, in the emergency tank device 100 according to Embodiment 1, when the insulating oil in the transformer 200 is sent to the emergency tank device 100 via the oil supply pipe 202 during the above-mentioned emergency, the insulating oil is guided by the relay pipe 30 and flows down into the tank section 101 of the oil tank section 10 (see the solid arrow in Figure 4). At this time, the air inside the tank section 101 is discharged to the outside of the relay pipe 30 through the gap between the surrounding section 22 and the cylindrical section 31 and the gap between the surrounding section 22 and the cylindrical section 41 (see the dashed arrow in Figure 4).

[0040] Furthermore, as described above, the emergency tank device 100 according to Embodiment 1 has a band member 60, making the installation of the mesh portion 50 easy. The worker can easily attach the mesh portion 50 to the cylindrical portion 41 of the cover portion 40 by simply spreading the mesh member that will become the mesh portion 50 on the outer surface of the cylindrical portion 41 and then wrapping the band member 60 around the outside of the mesh member. Thus, in the emergency tank device 100 according to Embodiment 1, the installation of the mesh portion 50 is easy, which improves work efficiency in the manufacturing process and increases productivity.

[0041] Furthermore, as described above, the emergency tank device 100 according to Embodiment 1 is equipped with a mesh portion 50, which prevents insects from entering the tank portion 101 of the oil tank portion 10 through the gap G (through hole 21).

[0042] Furthermore, in the emergency tank device 100 according to Embodiment 1, as described above, the band member 60 is positioned on the outer circumferential surface of the cylindrical portion 41, closer to the hollow plate portion 42. That is, since the band member 60 is positioned closer to the base of the cylindrical portion 41, where the resistance to deformation is stronger compared to the tip, the problem of the band member 60 loosening over time can be suppressed.

[0043] Furthermore, in the emergency tank device 100 according to Embodiment 1, as described above, since the edge of the hollow plate portion 42 protrudes outward from the cylindrical portion 41, corrosion of the band member 60 due to sunlight, rain, etc. can be suppressed.

[0044] Furthermore, in the emergency tank device 100 according to Embodiment 1, as described above, a surrounding portion 22 extending upward is provided around the edge of the through hole 21, so that rainwater can flow over the upper surface of the lid body 24 of the lid portion 20 and into the tank portion 101 of the oil tank portion 10 through the through hole 21. Moreover, since the lower end of the cylindrical portion 31 is positioned inside the surrounding portion 22, the surrounding portion 22 also serves as a guide when aligning the cylindrical portion 31 with the through hole 21. In addition, it is possible to prevent the falling insulating oil from splashing back and flying out through the through hole 21.

[0045] Furthermore, in the emergency tank device 100 according to Embodiment 1, as described above, the surrounding portion 22 is disposed between the cylindrical portion 41 and the cylindrical portion 31, and the upper end of the surrounding portion 22 is higher than the lower ends of the cylindrical portion 41 and the cylindrical portion 31. Therefore, the surrounding portion 22 and the cylindrical portion 41 overlap in the radial direction of the cylindrical portion 41, that is, in the radial direction of the surrounding portion 22, so that rainwater droplets are carried by the wind and enter the tank portion 101 of the oil tank portion 10 through the through hole 21.

[0046] (Embodiment 2) The emergency tank device 100 according to Embodiment 2, like the emergency tank device 100 according to Embodiment 1, includes an oil tank section 10, a lid section 20, a relay pipe 30, a cover section 40, and a mesh section 50. The emergency tank device 100 according to Embodiment 2 differs from Embodiment 1 only in the configuration of the cover section 40, so only the cover section 40 will be described below.

[0047] Figure 5 is a perspective view showing the cover portion 40 and the mesh portion 50 of the emergency tank device 100 according to Embodiment 2. The cover portion 40 of the emergency tank device 100 according to Embodiment 2 includes a hollow plate portion 42 and a cylindrical portion 41, similar to Embodiment 1. The shape of the hollow plate portion 42 is the same as in Embodiment 1, so its description is omitted. Note that in Figure 5, for the sake of explanation, the mesh portion 50 is shown attached to the cylindrical portion 41 of the cover portion 40, and the hollow plate portion 42 and the band member 60 are not shown.

[0048] As in Embodiment 1, the cylindrical portion 41 is cylindrical in shape and is provided on the lower surface 421 of the hollow plate portion 42, which is a hollow disc shape, with its axial direction being vertical. The outer diameter of the cylindrical portion 41 is smaller than the outer diameter of the hollow plate portion 42. In addition, a gap G is formed between the lower end of the cylindrical portion 41 and the upper surface of the lid 24.

[0049] As shown in Figure 5, in the emergency tank device 100 according to Embodiment 2, hook portions 70 are provided protruding from the outer circumferential surface of the cylindrical portion 41. Two hook portions 70 are provided on the cylindrical portion 41, and the two hook portions 70 are arranged at the same position in the circumferential direction of the cylindrical portion 41 and are separated in the vertical direction. The protruding end of each hook portion 70 is bent upward.

[0050] A mesh portion 50 is fitted onto the outer circumferential surface of the cylindrical portion 41 of the cover portion 40. That is, the mesh portion 50 surrounds the outer circumferential surface of the cylindrical portion 41 and has a cylindrical shape. In this case, one end 51 (see dashed line in Figure 5) and the other end 52 of the mesh portion 50 overlap in the circumferential direction. Furthermore, the overlapping portion 53 where the one end 51 and the other end 52 of the mesh portion 50 overlap is hooked by a hook portion 70. That is, the hook portion 70 is inserted through the mesh 511 (hole) of one end 51 and the mesh 521 (hole) of the other end 52 of the mesh portion 50 at positions corresponding to each hook portion 70, so that the one end 51 and the other end 52 are caught on the hook portion 70 and the mesh portion 50 is held on the cylindrical portion 41. The mesh portion 50 is made of, for example, expanded metal, and the lower end of the mesh portion 50 is in contact with the upper surface of the lid 24 of the lid portion 20, sealing the gap G between the cylindrical portion 41 and the upper surface of the lid 24 (see Figure 4). In this state, the band member 60 is wound endlessly around the outer surface of the mesh portion 50, at a position closer to the hollow plate portion 42.

[0051] With the above configuration, when attaching the mesh portion 50 to the cylindrical portion 41 in the emergency tank device 100 according to Embodiment 2, the worker can hook the mesh 511 and 521 at one end 51 and the other end 52 of the mesh portion 50 onto the hook portion 70 to hold the mesh portion 50 to the cylindrical portion 41, and then wrap the band member 60 around it. Accordingly, in the emergency tank device 100 according to Embodiment 2, the attachment work of the mesh portion 50 is made even simpler, the work efficiency in the manufacturing process is further improved, and productivity can be increased.

[0052] Parts similar to those in Embodiment 1 are denoted by the same reference numerals, and detailed descriptions are omitted.

[0053] The technical features (constituent elements) described in Embodiments 1 and 2 are combinable with each other, and by combining them, new technical features can be conceived. The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the claims, not in the sense described above, and all modifications are intended to be in the sense and scope equivalent to the claims.

[0054] The matters described in each embodiment can be combined with each other. Furthermore, the independent and dependent claims described in the claims can be combined with each other in any combination, regardless of the form of reference. In addition, the claims use a form in which claims referencing two or more other claims (multi-claim form), but are not limited to this. A form in which multi-claims referencing at least one multi-claim (multi-multi-claim) may also be used. [Explanation of symbols]

[0055] 10: Oil tank section, 20: Lid section, 21: Through hole, 24: Lid body, 22: Surrounding section, 30: Relay pipe, 31: Cylindrical section, 40: Cover section, 41: Cylindrical section, 42: Hollow plate section, 50: Mesh section, 60: Band member, 70: Hook section, 100: Emergency tank device, 200: Transformer, 202: Oil supply pipe, 421: Bottom surface, 511, 521: Mesh (hole), G: Gap

Claims

1. An emergency tank device comprising an oil tank section and a lid section covering the opening of the oil tank section, for storing insulating oil supplied from a transformer via an oil supply pipe, A relay pipe is connected to the oil tank section at one end and to the oil supply pipe at the other end, through a through hole formed in the lid. A hollow plate portion is provided around the outer surface of the aforementioned relay pipe, A cylindrical portion is provided on the lower surface of the hollow plate portion and extends to a position above the lid portion, A mesh portion surrounds the outer surface of the cylindrical portion and seals the gap between the cylindrical portion and the lid portion, A band member that is fitted onto the mesh portion and presses the mesh portion against the cylindrical portion. An emergency tank system equipped with this system.

2. The emergency tank device according to claim 1, wherein the band member is disposed near the hollow plate portion.

3. The emergency tank device according to claim 2, wherein the edge of the hollow plate portion protrudes outward from the cylindrical portion.

4. The lid portion has a surrounding portion that protrudes from its upper surface so as to surround the through hole. The surrounding portion is, It is disposed between the cylindrical portion and the relay pipe, The emergency tank device according to claim 2 or 3, wherein the upper end is higher than the lower end of the cylindrical portion and the relay pipe.

5. The emergency tank device according to any one of claims 1 to 3, further comprising hook portions protruding from the outer circumferential surface of the cylindrical portion and inserted through holes at both ends in the circumferential direction of the mesh portion.

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