Metal corrugated oil conservator and transformer

Abstract

The utility model relates to a metal corrugated oil conservator which comprises a shell internally provided with an oil storage cavity used for storing oil; the core body made of metal materials is fixedly connected with the shell in the oil storage cavity, the core body is provided with corrugated joints, and a breathing cavity is formed in the interior after the core body and the shell are assembled. The utility model also provides a transformer adopting the metal corrugated oil conservator, which has the advantages that the phenomenon of structural damage or oil leakage caused by pressure overload like that of a traditional capsule oil conservator is not easy to occur, and the service life is more prominent than that of the traditional capsule oil conservator; and material embrittlement, fracture and elasticity loss caused by working in a high-temperature and high-pressure extreme environment are not easy to occur.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrical equipment, in particular to a metal corrugated oil conservator and a transformer. Background Art

[0002] Transformers typically play a crucial role in power generation systems. Oil-immersed transformers are common, using transformer oil for heat dissipation and insulation. Therefore, these transformers are often equipped with an oil tank, known as a pillow-like shape. The oil tank is not only a crucial component of the transformer system but also a key factor in ensuring stable and secure power transmission throughout the hydropower plant.

[0003] A conventional transformer oil conservator is simply a shell used to store transformer oil. It typically has a safety margin for internal pressure. However, if the transformer oil temperature rises abnormally, this margin can be breached, leading to an explosion.

[0004] To overcome these drawbacks, existing transformer oil pillows typically incorporate a capsule (or airbag) within the pillow's outer shell. Initially, the capsule is filled with gas. If the temperature of the transformer oil within the pillow rises abnormally, the oil expands, increasing the pressure within the outer shell. The capsule then contracts due to the oil's compression, freeing up more space within the shell to store the oil. This reduces internal pressure and improves safety.

[0005] Capsule oil pillows in transformers are susceptible to pressure overload caused by the thermal expansion and compression of the transformer oil, which can easily lead to structural damage or oil leakage. Furthermore, capsule oil pillows are typically made of plastic or rubber, which ages over time, especially in high-temperature and high-pressure environments. This can easily cause the capsule to become brittle, crack, or lose its elasticity. Furthermore, they are prone to reacting with the transformer oil, not only reducing capsule performance but also contaminating the transformer oil. Contaminated transformer oil can easily deteriorate, and rubber debris can circulate with the transformer oil, eventually depositing in the pipes and causing blockages, ultimately affecting the transformer's heat dissipation. Utility Model Content

[0006] Based on this, it is necessary to propose a metal corrugated oil storage cabinet to solve the problems of embrittlement, cracking and loss of elasticity of the capsule oil pillow. A transformer is also proposed.

[0007] According to one aspect of the present disclosure, a metal corrugated oil storage cabinet includes: a shell having an oil storage cavity for storing oil therein; a core body made of a metal material and fixedly connected to the shell body in the oil storage cavity, the core body having corrugated sections, and the core body and the shell body forming a breathing cavity therein after being assembled.

[0008] In some embodiments, the invention further comprises a displacement assisting member in the oil storage cavity, wherein the displacement assisting member is distributed around the periphery of the core body and fixedly assembled therewith, and each of the displacement assisting members is in contact with the inner wall of the shell;

[0009] The oil in the oil storage cavity expands due to heat and presses the core body in the first direction, so that each of the displacement auxiliary components moves in the first direction.

[0010] In some embodiments, each of the displacement assisting components includes two fixed frames that are mirror images of each other with the pulley as the midpoint, and a connecting shaft passing through the two fixed frames and the pulley;

[0011] The fixing frame is fixedly mounted on the core body, and the pulley contacts the inner wall of the shell and can move on the inner wall of the shell toward the first direction.

[0012] In some embodiments, each of the fixing brackets includes a welding portion and a mounting portion extending toward the inner wall of the housing;

[0013] The welding portion is welded to the core;

[0014] The mounting portion is provided with a through hole for the connecting shaft to pass through.

[0015] In some embodiments, the invention further comprises a desiccant tube fixedly mounted on the shell, wherein the desiccant tube is connected to the breathing cavity.

[0016] In some embodiments, the oil storage chamber further includes an exhaust pipe fixedly mounted on the housing, wherein the exhaust pipe is in communication with the oil storage chamber.

[0017] In some embodiments, the core includes at least one hollow bellows and a sealing plate that seals an opening at one end of the bellows, and the sealing plate is fixedly connected to the bellows.

[0018] In some embodiments, the outer surface of the core is coated with an anti-corrosion layer and an insulation layer in sequence.

[0019] In some embodiments, the volume of the oil storage chamber is larger than that of the breathing chamber.

[0020] According to another aspect of the present disclosure, a transformer includes the metal corrugated oil storage cabinet as described above.

[0021] Compared with traditional capsule oil pillows, the metal core with corrugated sections has better pressure resistance and is not prone to pressure overload, which may cause structural damage or oil leakage like traditional capsule oil pillows. In addition, its service life is more outstanding than that of traditional capsule oil pillows, and it is not prone to material embrittlement, cracking, and loss of elasticity due to working in extreme environments of high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional view of the overall structure of the internal structure of a metal corrugated oil conservator in one embodiment of the present disclosure.

[0023] Figure 2 1 is a side view of a metal corrugated oil conservator in one embodiment of the present disclosure.

[0024] Figure 3 2. It is a side view of the overall structure of the displacement assist component in one embodiment of the present disclosure.

[0025] Figure 4 This is a front view of the overall structure of the displacement assist component in one embodiment of the present disclosure.

[0026] Figure 5 Schematic diagram of the overall structure of a transformer in one embodiment of the present disclosure.

[0027] Reference numerals:

[0028] 100. Transformer;

[0029] 1. Metal corrugated oil conservator; 10. Shell; 10A, Oil storage chamber; 20. Core; 20A, Breathing chamber; 201, Bellows; 202, Closing plate; 30, Displacement assisting member; 301, Pulley; 302, Fixing bracket; 3021, Welding section; 3022, Mounting section; 303, Connecting shaft; 40, Dehumidifier tube; 50, Exhaust pipe;

[0030] P. First direction. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0032] In the description of the present disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this disclosure, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly or specifically limited.

[0034] Transformers are commonly used in various power generation systems, and oil-immersed transformers are a common type. Because the housing that stores transformer oil resembles a pillow, it's often called a transformer oil pillow. The transformer oil pillow is not only a crucial component of the transformer system but also a key factor in ensuring stable and secure power transmission throughout the entire power generation and transmission system. Typically, a capsule (air bladder) is placed within the pillow's outer shell. Initially, the capsule is filled with gas. If the temperature of the transformer oil within the pillow rises abnormally, the oil expands, increasing the pressure within the shell. At this point, the capsule contracts due to the oil's compression, freeing up more space within the shell to store the oil, thereby alleviating internal pressure and improving safety. Existing transformers with capsule oil pillows are susceptible to pressure overload caused by the thermal expansion and compression of the transformer oil, which can easily lead to structural damage or oil leakage. The primary materials of capsule oil pillows are typically plastic or rubber, which age over time. Especially in high-temperature and high-pressure environments, this can easily cause the capsule to become brittle, crack, or lose its elasticity, reducing its efficiency.

[0035] like Figures 1 to 4 As shown, an embodiment of the first aspect of the present disclosure provides a metal corrugated oil storage cabinet 1, wherein Figure 1 This is a cross-sectional view of the overall structure of the metal corrugated oil conservator 1 in one embodiment of the present disclosure; Figure 2 This is a side view of a metal corrugated oil conservator 1 according to an embodiment of the present disclosure; Figure 3Figure 3 is a side view of the overall structure of the displacement auxiliary member 30 in an embodiment of the present disclosure. Figure 4 Figure 4 is a front view of the overall structure of the displacement auxiliary member 30 in an embodiment of the present disclosure.

[0036] As shown in Figures 1 to 4 The metal corrugated oil tank 1 includes a shell 10 and a core 20. The shell 10 has an oil storage cavity 10A inside for storing oil. The core 20 made of metal material is fixedly connected with the shell 10 in the oil storage cavity 10A. Compared with the traditional capsule oil pillow, the metal corrugated oil tank 1 of the present disclosure is made of new technology. Specifically, the core 20 has corrugated sections, and the inside of the core 20 after assembly with the shell 10 forms a breathing cavity 20A.

[0037] As shown in Figure 5 An example of the metal corrugated oil tank 1 of the present disclosure is shown, wherein, Figure 5 Figure 1 is a schematic diagram of the overall structure of the transformer 100 in an embodiment of the present disclosure. The transformer 100 includes the metal corrugated oil tank 1.

[0038] When the metal corrugated oil tank 1 of the present disclosure is applied to the transformer 100, during operation of the transformer 100, the core 20 in the oil storage cavity 10A is expanded and pressed by heat. The pressed core 20 deforms through the corrugated sections to change the volume of the breathing cavity 20A.

[0039] Compared with the traditional capsule oil pillow, the metal corrugated oil tank 1 of the present disclosure is made of new materials. Specifically, unlike the traditional capsule oil pillow, the core 20 of the present disclosure is made of a metal core 20 with corrugated sections. The metal core 20 has excellent pressure resistance and is not prone to structural damage or oil leakage caused by pressure overload, as is the case with traditional capsule oil pillows. In addition, the service life of the metal corrugated oil tank 1 of the present disclosure is more prominent than that of traditional capsule oil pillows, and it is not prone to material embrittlement, cracking, and loss of elasticity caused by working in extreme environments of high temperature and high pressure. Therefore, the metal corrugated oil tank 1 of the present disclosure has reliable and stable performance.

[0040] It is worth noting that the breathing cavity 20A formed after assembly of the core 20 and the shell 10 can also be understood as a flat surface formed by assembly of the shell 10 and the core 20. The surface of the shell 10 inside the breathing cavity 20A forms the inner wall surface of the breathing cavity 20A.

[0041] In specific implementations, the metal or metal material mentioned in this disclosure can be stainless steel. The core 20 and housing 10 mentioned in this disclosure can be fixedly connected, for example, by welding. Furthermore, the metal or metal material mentioned above can be the same material as the housing 10 to facilitate welding or other fixing methods. Since the housing 10 is the shell of the metal corrugated oil conservator 1, the core 20 and housing 10 can be fixed by welding. The same material between the housing 10 and the core 20 makes the weld more secure. Furthermore, even if the core 20 repeatedly expands and contracts due to repeated increases and decreases in transformer oil temperature, it is unlikely to break at its fixed position, thus extending the overall service life. Furthermore, by using the same metal material as the housing 10, the drawback of the capsule-type design used in the prior art is overcome: in actual use, transformer oil is unlikely to react with the material of the core 20. Consequently, the transformer oil is unlikely to become contaminated or deteriorated during use, extending the life of the transformer oil and, consequently, the service life of the entire equipment.

[0042] like Figure 3 、 4 As shown, Figure 3 This is a side view of the overall structure of the displacement assisting member 30 in one embodiment of the present disclosure; Figure 4 This is a front view of the overall structure of the displacement assist member 30 in one embodiment of the present disclosure. The metal corrugated oil conservator 1 also includes a displacement assist member 30 located within the oil storage chamber 10A. Several displacement assist members 30 are distributed around the periphery of the core 20 and fixedly assembled thereto, with each displacement assist member 30 contacting the inner wall of the housing 10. Thermal expansion of the oil in the oil storage chamber 10A compresses the core 20 in a first direction P, enabling each displacement assist member 30 to move in the first direction P.

[0043] For more detailed information, see Figure 1 、 3 As shown, a displacement assist member 30 is fixed to the outer wall of the core 20 and contacts the inner wall of the housing 10, thereby maintaining the core 20 structure within the oil reservoir 10A. This also limits the direction in which the heated oil in the oil reservoir 10A exerts pressure on the core 20, making the device's operation more reliable. For illustrative purposes, the aforementioned pressure direction should be understood as being in the first direction P or a direction opposite to the first direction P.

[0044] It is worth noting that the above-mentioned displacement auxiliary components 30 are distributed on the periphery of the core body 20. It should be understood that the distribution of the displacement auxiliary components 30 on the outer peripheral wall of the core body 20 is relatively distributed. Of course, it can also be understood as the displacement auxiliary components 30 relatively distributed on the outer peripheral wall of the core body 20.

[0045] Optionally, the number of the displacement assisting members 30 is at least two. Of course, the number of the displacement assisting members 30 mentioned above being at least two is not limited by the present disclosure, and those skilled in the art may add or select more displacement assisting members according to actual needs.

[0046] Continue to refer to Figure 4 As shown, Figure 4 This is a front view of the overall structure of a displacement assist member 30 in one embodiment of the present disclosure. Each displacement assist member 30 comprises two fixed frames 302, mirror images of each other with a pulley 301 as the midpoint, and a connecting shaft 303 extending through the two fixed frames 302 and the pulley 301. The fixed frames 302 are fixed to the core 20, while the pulley 301 contacts the inner wall of the housing 10 and can move along the inner wall of the housing 10 in a first direction P.

[0047] To further illustrate, the core 20 deforms under pressure in the first direction P, driving the displacement assist member 30 affixed thereto to move synchronously. Simultaneously, the pulley 301 rolls on the inner wall of the housing 10. Thus, the displacement assist member 30 not only maintains the core 20 within the oil reservoir 10A but also reduces friction during displacement.

[0048] More specifically, the two mirror-image mounting brackets 302 mentioned above, which are mirror images of the pulley 301, have the axial midpoint of the pulley 301 as the mirror point. For example, the distance between the two mounting brackets 302 is greater than the axial dimension of the pulley 301.

[0049] For more details, please refer to Figure 4 As shown, Figure 4 This is a front view of the overall structure of the displacement assist member 30 in one embodiment of the present disclosure. Each mounting bracket 302 includes a welding portion 3021 and a mounting portion 3022 extending toward the inner wall of the housing 10. The welding portion 3021 is welded to the core 20. The mounting portion 3022 is provided with a through hole (not shown in the figure) for the connecting shaft 303 to pass through.

[0050] The fixing frame 302 is arranged so that the fixing frame 302 and the core 20 are assembled by welding, and the connecting shaft 303 passes through the two opposite mounting portions 3022, which reflects the scientific and reasonable structural design of the device.

[0051] It is worth noting that the fixing frame 302 can be made in one piece, and the mounting portion 3022 is folded and extended from the welding portion 3021 toward the inner wall of the shell 10, and the mounting portion 3022 does not contact the inner wall of the shell 10, that is, there is a gap between the mounting portion 3022 and the inner wall of the shell 10.

[0052] like Figure 1 、 2 As shown, Figure 1This is a cross-sectional view of the overall structure of the metal corrugated oil conservator 1 in one embodiment of the present disclosure; Figure 2 This is a side view of a metal corrugated oil conservator 1 according to one embodiment of the present disclosure. The metal corrugated oil conservator 1 also includes a desiccant tube 40 fixedly mounted on the housing 10. The desiccant tube 40 communicates with the breathing chamber 20A. This allows commercially available desiccant devices to dehumidify the breathing chamber 20A via the desiccant tube 40.

[0053] like Figure 1 、 2 As shown, Figure 1 This is a cross-sectional view of the overall structure of the metal corrugated oil conservator 1 in one embodiment of the present disclosure; Figure 2 This is a side view of a metal corrugated oil conservator 1 according to one embodiment of the present disclosure. The metal corrugated oil conservator 1 also includes an exhaust pipe 50 fixedly mounted on the housing 10 and communicating with the oil storage chamber 10A. The provision of the exhaust pipe 50 facilitates exhausting the oil storage chamber 10A.

[0054] In some embodiments, the exhaust pipe 50 is further provided with a valve.

[0055] like Figure 1 As shown, Figure 1 This is a cross-sectional view of the overall structure of a metal corrugated oil conservator 1 in one embodiment of the present disclosure. The core 20 includes at least one hollow bellows 201 and a sealing plate 202 that seals one end of the bellows 201. The sealing plate 202 is fixedly connected to the bellows 201.

[0056] The sealing plate 202 that seals one end of the bellows 201 can be understood as being assembled by welding, and the other end of the bellows 201 should be understood as being fixedly connected to the inner wall of the shell 10, thereby forming the breathing chamber 20A.

[0057] In some embodiments, those skilled in the art may choose to connect multiple bellows 201 in series by welding according to the actual volume requirements of the breathing chamber 20A, and weld one end of the series-connected bellows 201 to the flat surface of the inner wall of the shell 10, and weld the other end of the series-connected bellows 201 to the sealing plate 202.

[0058] It is worth noting that the above-mentioned bellows section is possessed by the bellows 201 .

[0059] In the present disclosure, the outer surface of the core 20 is coated with an anti-corrosion layer and an insulation layer in sequence.

[0060] Optionally, the anti-corrosion layer is composed of epoxy anti-corrosion coating with excellent adhesion to metal, excellent electrical insulation performance, and resistance to alkali, oil and water; the insulating coating is composed of ceramic insulating coating, that is, the anti-corrosion layer has an insulating effect and the insulating coating has an anti-corrosion effect.

[0061] Further, the volume of the oil storage cavity 10A is greater than the volume of the breathing cavity 20A. As an example, a person skilled in the art can set the volume of the oil storage cavity 10A and the volume of the breathing cavity 20A according to actual needs.

[0062] As shown in Figure 5 An embodiment of the second aspect of the present disclosure provides a transformer 100, which comprises the metal corrugated oil conservator 1 provided in the first aspect. Figure 5 FIG. 1 is a schematic diagram of the overall structure of the transformer 100 in an embodiment of the present disclosure.

[0063] In the present disclosure, compared with the traditional capsule oil pillow, the metal core 20 provided with the corrugated section has excellent pressure resistance, and is not prone to structural damage or oil leakage caused by pressure overload as the traditional capsule oil pillow. In addition, the service life of the metal corrugated oil conservator 1 is more prominent than that of the traditional capsule oil pillow, and is not prone to material embrittlement, rupture, loss of elasticity caused by working in an extreme environment of high temperature and high pressure. Therefore, the service performance of the metal corrugated oil conservator 1 is reliable and stable. Further, the metal or metal material mentioned in the present disclosure can be stainless steel. The fixed connection between the core 20 and the shell 10 mentioned in the present disclosure can be, for example, a welding assembly. Further, the metal or metal material mentioned above can be the same material as the shell 10 to facilitate welding or other fixing methods. Since the shell 10 is the shell of the metal corrugated oil conservator 1, the core 20 and the shell 10 are fixed by welding. The same material between the shell 10 and the core 20 makes the welding more firm. Therefore, even if the core 20 repeatedly expands and contracts due to repeated temperature rise and fall of the transformer oil, the fixed position is difficult to break, prolonging the overall service life. At the same time, since the same metal material as the shell 10 is used, the disadvantages of the existing technology using the capsule type are overcome, that is, the transformer oil is difficult to react with the material of the core 20 in actual use, and the transformer oil is basically not polluted and deteriorated during use, prolonging the service life of the transformer oil and the service life of the entire equipment.

[0064] In the present disclosure, unless otherwise explicitly specified and limited, if the terms "mounting", "connection", "connecting", "fixing" and the like appear, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0065] In this disclosure, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions appear, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, the phrase "above," "above," and "above" a first feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The phrase "below," "below," and "below" a first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0066] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only embodiment.

[0067] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments merely illustrate several implementations of the present disclosure, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art would be able to make numerous variations and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A metal corrugated oil storage cabinet, characterized in that: include: a housing having an oil storage cavity therein for storing oil; and The core body is made of metal material and is fixedly connected to the shell in the oil storage cavity. The core body has a corrugated section, and a breathing cavity is formed inside the core body and the shell after being assembled.

2. The metal corrugated oil conservator according to claim 1, characterized in that: It also includes a displacement assisting member in the oil storage cavity, wherein the displacement assisting members are distributed around the periphery of the core and fixedly assembled therewith, and each of the displacement assisting members contacts the inner wall of the shell; The oil in the oil storage cavity expands due to heat and presses the core body in the first direction, so that each of the displacement auxiliary components moves in the first direction.

3. The metal corrugated oil conservator according to claim 2, characterized in that: Each of the displacement auxiliary components includes two fixed frames that are mirror images with the pulley as the midpoint, and a connecting shaft passing through the two fixed frames and the pulley; The fixing frame is fixedly mounted on the core body, and the pulley contacts the inner wall of the shell and can move on the inner wall of the shell toward the first direction.

4. The metal corrugated oil conservator according to claim 3, characterized in that: Each of the fixing brackets includes a welding portion and a mounting portion extending toward the inner wall of the shell; The welding portion is welded to the core; The mounting portion is provided with a through hole for the connecting shaft to pass through.

5. The metal corrugated oil conservator according to claim 1, characterized in that: It also includes a desiccant tube fixedly mounted on the shell, and the desiccant tube is communicated with the breathing cavity.

6. The metal corrugated oil conservator according to claim 1, characterized in that: It also includes an exhaust pipe fixedly mounted on the shell, and the exhaust pipe is communicated with the oil storage chamber.

7. The metal corrugated oil conservator according to any one of claims 1 to 4, characterized in that: The core body includes at least one hollow corrugated tube and a sealing plate for sealing an opening at one end of the corrugated tube, and the sealing plate is fixedly connected to the corrugated tube.

8. The metal corrugated oil conservator according to any one of claims 1 to 4, characterized in that: The outer surface of the core is coated with an anti-corrosion layer and an insulation layer in sequence.

9. The metal corrugated oil conservator according to claim 1, characterized in that: The volume of the oil storage chamber is larger than that of the breathing chamber.

10. A transformer, characterized in that: include: The metal corrugated oil conservator according to any one of claims 1 to 9.

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