Corrugated internal oil type oil conservator

Abstract

The invention belongs to the technical field of transformers, and discloses a corrugated inner oil type oil conservator which is characterized in that an oil level digital display screen and a pair of conservator bases are mounted at the bottom of an oil conservator shell, junction boxes are mounted on the conservator bases, and a plurality of corrugated pipes are uniformly mounted in the oil conservator shell side by side in the length direction; the distance sensor is installed on the outer side of one corrugated pipe core body, a top pull wire matched with the distance sensor is fixed to the upper portion of an upper cover plate of the corrugated pipe core body, and the junction box is electrically connected with the distance sensor and the oil level digital display screen. A plurality of limiting mechanisms are arranged above each corrugated pipe core body upper cover plate; the pressure relief valve is installed above an upper cover plate of one corrugated pipe core body, one end of the pressure relief valve is communicated with the interior of the corrugated pipe core body, the other end of the pressure relief valve is communicated with one end of the pressure relief pipe, and the other end of the pressure relief pipe penetrates through the oil conservator shell to be led to the lower portion. According to the invention, the oil level reading is convenient to observe, the corrugated pipe core body is prevented from being damaged, and the overpressure condition can be effectively controlled.

Description

Technical Field

[0001] The invention discloses a corrugated inner oil type oil storage cabinet which meets the requirements of expansion limit self-locking and pressure relief function, and belongs to the technical field of transformers. Background Art

[0002] The oil conservator is located on the top of the transformer oil tank, also called the oil pillow. It is a container connected to the transformer oil tank to adapt to the volume change of the transformer oil in the oil tank. As an alternative to the capsule oil conservator, the corrugated oil conservator is widely used in oil-immersed power transformers of various voltage levels, and can achieve the compensation requirements for oil volume changes caused by environmental changes.

[0003] In the existing corrugated oil storage cabinet, the oil level indicator mechanism is located on the upper part of the transformer during normal operation, which is not conducive to observing the oil level reading during nighttime operation and maintenance. There is no expansion limit measure, and there is a risk of over-limit expansion of the bellows core due to on-site operational errors, which may damage the bellows core. There is no pressure relief mechanism to control overpressure conditions. If an incorrect operation occurs, the bellows core may be damaged and oil leakage may occur.

[0004] As the requirements for power system operation and maintenance become increasingly stringent, more stringent requirements are placed on the technology of oil storage cabinets, which not only need to meet the oil compensation requirements, but also require further intelligent and digital configuration. In order to meet the requirements of power operation and maintenance for oil storage cabinets, it is urgent to develop a new type of corrugated internal oil storage cabinet that meets the expansion limit self-locking, over-limit pressure relief, and data collection and conversion functions. Summary of the invention

[0005] In order to solve the above technical problems, the present invention discloses a novel corrugated inner oil type oil storage cabinet. The technical solution adopted by the present invention is: A corrugated inner oil type oil storage cabinet, comprising an oil storage cabinet shell of a rectangular structure, a bellows located in the oil storage cabinet shell, the bellows comprising a bellows core body, the bellows core body is welded with an upper cover plate and a lower cover plate for sealing, an oil level digital display screen and a pair of cabinet bases are installed at the bottom of the oil storage cabinet shell, a junction box is installed on the cabinet base, a plurality of bellows are evenly installed side by side in the length direction of the oil storage cabinet shell, a distance sensor is installed on the outside of one of the bellows core bodies, a top pull wire matched with the distance sensor is fixed above the upper cover plate corresponding to the bellows core body, the junction box is electrically connected to the distance sensor and the oil level digital display screen; a plurality of limit mechanisms are arranged above the upper cover plate corresponding to each bellows core body; a pressure relief valve is installed above the upper cover plate corresponding to one of the bellows core bodies, one end of the pressure relief valve is communicated with the inside of the bellows core body, the other end of the pressure relief valve is communicated with one end of the pressure relief pipe, and the other end of the pressure relief pipe passes through the oil storage cabinet shell and is led to the bottom of the oil storage cabinet shell and fixed.

[0006] Preferably, the pressure relief pipe comprises a corrugated hose and a steel pipe, the main body of the pressure relief pipe is made of the steel pipe, and the corrugated hose is used at the joint between the upper end of the main body of the pressure relief pipe and the pressure relief valve.

[0007] Preferably, the top ends of the several bellows core bodies are connected through an exhaust connecting pipe, which includes an exhaust steel pipe and an exhaust hose. The exhaust steel pipe is connected to the interior of the bellows core body through a connecting piece, and adjacent exhaust steel pipes are connected through an exhaust hose. A branch pipe joint is led out from one section of the exhaust steel pipe, and the top end of the exhaust pipe is sealed and connected to the branch pipe joint, and the bottom end of the exhaust pipe passes through the bottom of the oil conservator outer shell and is led to the bottom of the oil conservator outer shell and is fixed.

[0008] Preferably, an exhaust valve is installed at the bottom end of the exhaust pipe, and the exhaust valve is in a normally closed state.

[0009] Preferably, the main connecting pipe is fixedly installed below the bottom of the oil storage cabinet shell, and the main connecting pipe is sealed and connected to the inside of several bellows cores respectively. One end of the oil filling pipe is sealed and connected to the main connecting pipe, and an oil filling valve is installed at the other end of the oil filling pipe.

[0010] Preferably, a high and low oil level alarm device is fixedly installed inside the oil storage cabinet shell, and the high and low oil level alarm device includes an oil level alarm rod and a travel switch. The lower end of the oil level alarm rod is fixedly installed in the gap between adjacent bellows core bodies, and mounting holes are provided at the upper and lower parts of the oil level alarm rod. The travel switch is installed in the mounting hole. The travel switch includes a travel switch body and an alarm trigger rod. The alarm trigger rod of the upper travel switch is installed above the upper cover plate, and the alarm trigger rod of the lower travel switch is installed in the gap between two adjacent corrugations. The travel switch body is electrically connected to the junction box.

[0011] Preferably, a rubber pad is fixedly mounted on the upper surface of the limiting mechanism.

[0012] Preferably, a vertical oil level indication observation window is provided on the side of the oil conservator shell, and the oil level indication observation window is sealed with a plate made of a transparent material. The outer surfaces of the oil conservator shell on both sides of the oil level indication observation window are respectively provided with ambient temperature scale markings and oil level scale markings, and an oil level warning mechanism is provided on the outer surface of the corrugated tube core corresponding to the oil level indication observation window.

[0013] Preferably, a grounding wire connection socket is fixedly arranged on the cabinet base, and the grounding wire connection socket is connected to the transformer body.

[0014] Preferably, a plurality of reinforcing ribs are arranged in the length direction of the top of the oil conservator shell, and both ends of the length direction of the oil conservator shell are arc structures adapted to the bellows core body, and fixed connecting plates made of rigid material are installed between the plurality of bellows core bodies, and both ends of the fixed connecting plates are fixedly installed above the upper cover plates corresponding to the adjacent bellows core bodies.

[0015] Beneficial effects of the present invention: The present invention facilitates observation of oil level readings by providing an oil level digital display screen; avoids damage to the bellows core by providing a limit mechanism; and effectively controls overpressure conditions by providing a pressure release valve to ensure safe operation of the oil storage cabinet, so that the oil storage cabinet product can better meet the State Grid's requirements for smart substations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a corrugated inner oil storage cabinet according to an embodiment of the present invention; Figure 2 It is a left side view of the corrugated inner oil storage cabinet according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a main coupling pipe according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a cabinet base viewed from the left side of an embodiment of the present invention; In the figure, 1. oil storage cabinet shell, 2. cabinet base, 3. bellows core, 4. main connecting pipe, 5. exhaust pipe, 6. oil filling pipe, 7. pressure relief pipe, 8. pressure release valve, 9. limit mechanism, 10. exhaust steel pipe, 11. exhaust hose, 12. reinforcing ribs, 13. oil level indication observation window, 14. oil level digital display screen, 15. high and low oil level alarm device, 16. oil level warning mechanism, 17. grounding wire connection socket. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings.

[0018] like Figure 1-4 ( Figure 1As shown in the figure (including partial perspective effect), a corrugated inner oil type oil conservator includes an oil conservator shell 1 of rectangular structure, and a plurality of corrugated pipes (three in this embodiment, the number of which can be determined according to the total oil weight of the transformer and the ambient temperature) are evenly and fixedly installed side by side in the inner length direction of the oil conservator shell 1, and the corrugated pipe includes a corrugated pipe core 3, and the corrugated pipe core 3 is sealed by welding through an upper cover plate and a lower cover plate, and transformer oil is stored in the corrugated pipe core 3 to ensure that the corrugated pipe core 3 does not leak oil. A company nameplate is installed on the positive side of the length direction of the oil conservator shell 1, and a pair of cabinet bases 2 are fixedly installed on the outer side of the bottom of the oil conservator shell 1, and the oil conservator shell 1 is fixedly installed above the transformer oil tank by bolts and the cabinet base 2. A plurality of reinforcing ribs 12 are provided on the top length direction of the oil conservator shell 1 by welding. In the embodiment of the present invention, two parallel and symmetrical reinforcing ribs 12 are arranged on the outer side of the top of the oil conservator shell 1, so as to enhance the anti-deformation capability of the top of the oil conservator shell 1. The reinforcing ribs 12 can be made of 14# channel steel.

[0019] In order to better meet the installation requirements of the bellows core 3, the two ends of the oil storage cabinet shell 1 in the length direction can be processed into arc structures that match the bellows core 3. A fixed connecting plate made of rigid material is installed between several bellows cores 3. The two ends of the fixed connecting plate can be fixedly installed on the upper cover plate corresponding to the adjacent bellows core 3 by bolts. The fixed connecting plate can make each bellows core 3 form a whole to achieve synchronous expansion and contraction, ensuring the consistency of the expansion and contraction movement of the bellows core 3. Studs are welded on the lower surface of the lower cover plate corresponding to the bellows core 3, and the bellows is fixedly installed on the lower part of the oil storage cabinet shell 1 through the studs and nuts. The main connecting pipe 4 is fixedly installed below the bottom outer side of the oil storage cabinet housing 1. An oil filling hole is opened at the center of the lower cover plate corresponding to the bellows core 3, and studs are welded around the oil filling hole. The main connecting pipe 4 is sealed and connected to the inside of several bellows cores 3 through connecting flanges, seals, studs and nuts. By setting the main connecting pipe 4, several bellows cores 3 can be connected to each other to ensure that the oil level of the transformer oil in several bellows cores 3 is always consistent, and oil can be injected into several bellows cores 3 synchronously. One end of the oil injection pipe 6 is connected to the main connecting pipe 4, and the other end of the oil injection pipe 6 is installed with an oil injection valve. The oil valve is opened to connect the oil injection machine to inject transformer oil into the bellows core 3. The lower part of the main connecting pipe 4 is connected to the transformer oil tank through a connector, and the transformer oil in the bellows core 3 is used to adjust and adapt to the volume change of the transformer oil in the tank. The main connecting pipe 4 plays the role of a main breathing pipe for the oil system to expand and contract due to heat. When the oil system expands due to heat, the transformer oil flows into the bellows core 3. When the oil system contracts due to cold, the transformer oil flows back from the bellows core 3 into the transformer oil tank.

[0020] A pressure relief valve 8 is arranged on the top of one of the bellows core bodies 3. The pressure relief valve 8 is fixedly mounted on the outer surface of the upper cover plate corresponding to the bellows core body 3 by bolts. One end of the pressure relief valve 8 is communicated with the inside of the bellows core body 3, and the other end of the pressure relief valve 8 is communicated with one end of a pressure relief pipe 7. The other end of the pressure relief pipe 7 passes through the oil storage cabinet shell 1 and is led to the bottom of the oil storage cabinet shell 1 for fixation. The pressure relief pipe 7 can adopt a structure of a corrugated hose and a steel pipe. The main part of the pressure relief pipe 7 adopts a DN25 steel pipe. A corrugated hose is used when the upper part of the main body of the pressure relief pipe 7 is connected to the pressure relief valve 8. Because the pressure relief valve 8 moves up and down with the bellows core body 3, the use of a corrugated hose facilitates the movement of the pressure relief valve 8 and is not easy to be damaged. The pressure relief valve 8 can adopt a mechanical structure with a spring. When the oil pressure inside the bellows core 3 reaches the specified threshold of the pressure relief valve (for example, 55kPa), the spring action of the pressure relief valve 8 automatically opens the pressure relief channel, and the transformer oil or gas automatically releases pressure along the pressure relief pipe 7. The pressure is released by draining the oil during oil filling and by exhausting the air during pressure relief.

[0021] The top ends of the several bellows core bodies 3 are connected through an exhaust connecting pipe, which includes an exhaust steel pipe 10 and an exhaust hose 11. The exhaust steel pipe 10 is connected to the inside of the bellows core body 3 through a connector, and the adjacent exhaust steel pipes 10 are connected through the exhaust hose 11. The exhaust hose 11 can be a bellows with a wire sleeve. When the bellows core body 3 is in long-term operation, there may be operation errors between each other. The exhaust hose 11 is soft and easy to bend, so as to avoid damage to the exhaust connecting pipe when there is an operation error in the bellows core body 3. A branch pipe joint is machined and led out on the first section of the exhaust steel pipe 10 at the left end. The top end of the exhaust pipe 5 made of rigid material is sealed and connected to the branch pipe joint. The bottom end of the exhaust pipe 5 passes through the bottom of the oil storage cabinet shell 1 and is led to the bottom of the oil storage cabinet shell 1 and fixed. The bottom end of the exhaust pipe 5 is installed with an exhaust valve that can be opened or closed. The exhaust valve of the exhaust pipe 5 is in a normally closed state and can only be opened during the oil filling stage. After the exhaust valve is opened, the interior of the bellows core 3 is connected to the external atmosphere through the exhaust pipe 5. The exhaust pipe 5 serves as an inner cavity exhaust pipeline of the bellows core 3, realizing the exhaust function of the bellows core 3 during the oil filling process, ensuring that no air accumulates inside the bellows core 3 after the oil filling is completed.

[0022] A pair of limiting mechanisms 9 spaced a certain distance apart are fixedly provided on the upper surface of the upper cover plate corresponding to each bellows core body 3 by welding, and rubber pads are fixedly installed on the upper surface of the limiting mechanisms 9 by bonding, so as to prevent the limiting mechanisms 9 from scratching the inner surface of the oil storage cabinet shell 1.

[0023] The left side of the oil storage tank housing 1 is provided with a vertical oil level indication observation window 13, and the oil level indication observation window 13 is sealed with a transparent plate material, which is convenient for observing the oil level and dustproof. The outer surface of the oil storage tank housing 1 on the left side of the oil level indication observation window 13 is provided with an ambient temperature scale mark, and the outer surface of the oil storage tank housing 1 on the right side of the oil level indication observation window 13 is provided with an oil level scale mark, which is convenient for observing the oil level according to the current ambient temperature. An oil level warning mechanism 16 is provided on the outer surface of the left corrugated pipe core 3 at the position corresponding to the oil level indication observation window 13. The oil level warning mechanism 16 is an L-shaped structure. The oil level warning mechanism 16 is fixedly installed on the upper side of the left end of the corrugated pipe core 3 near the position of the oil level indication observation window 13. The oil level warning mechanism 16 can be a steel plate with a red mark on the surface. The red mark is designed as a red thick line with a width of about 5 cm. The red mark can make the oil level indication of the oil level warning mechanism 16 more eye-catching.

[0024] A high and low oil level alarm device 15 is fixedly installed inside the oil storage cabinet shell 1. The high and low oil level alarm device 15 includes an oil level alarm rod and a travel switch. The oil level alarm rod is fixedly installed in the gap between the adjacent bellows core bodies 3, and the lower end of the oil level alarm rod is fixedly installed on the bottom of the oil storage cabinet shell 1 by bolts or welding. The upper and lower parts of the oil level alarm rod are provided with mounting holes, and the travel switch is fixedly installed in the mounting holes by bolts. The travel switch includes an alarm trigger rod. The upper alarm trigger rod corresponds to the fixed connecting plate at the top of the bellows core body 3, and the lower alarm trigger rod is installed in the gap between two adjacent corrugations. The travel switch is electrically connected to the junction box on the cabinet base 2, and the junction box is connected to the alarm device at the remote backend by wire. When the bellows core 3 runs upward, when the fixed connecting plate touches the upper alarm trigger rod, the travel switch sends a high oil level electrical signal to the alarm device through the junction box, thereby triggering a high oil level alarm (high oil level means that the oil level reaches 95%); when the bellows core 3 runs downward, when the corrugation touches the lower alarm trigger rod, the travel switch sends a low oil level electrical signal to the alarm device through the junction box, thereby triggering a low oil level alarm (low oil level means that the oil level reaches 5%).

[0025] An oil level digital display screen 14 is fixedly installed at the lower left end of the oil storage cabinet housing 1. The oil level digital display screen 14 is electrically connected to a junction box installed on the cabinet base 2. The junction box is a collection mechanism for all signals inside the oil storage cabinet, including high and low oil level signals, 4-20mA signals, etc. The oil level digital display screen 14 receives the 4-20mA signal transmitted by the distance sensor inside the oil storage cabinet. The oil level digital display screen 14 performs digital conversion on the 4-20mA signal and finally displays the value of the oil level. This design solves the technical defect that the oil level in the existing corrugated internal oil storage cabinet is not easy to observe.

[0026] The distance sensor is fixed beside the outside of one of the bellows core bodies 3, and the top pull wire of the distance sensor is fixed on the upper cover plate at the top of the bellows core body 3. The distance sensor is electrically connected to the junction box. The distance sensor cooperates with the top pull wire to monitor the up and down movement of the bellows core body 3, and converts the movement distance signal into a 4-20mA signal, which is transmitted to the junction box on the cabinet base 2 and finally displayed on the screen through the oil level digital display screen 14.

[0027] The cabinet base 2 is an inverted trapezoidal structure formed by welding 14# channel steel, and a through hole for the pipeline to pass through is opened on the cabinet base 2 ( Figure 3 The through hole is not shown in the figure), and the inverted trapezoidal structure can make the oil storage cabinet housing 1 more firmly installed. The lower outer surface of the cabinet base 2 is provided with a grounding wire connection seat 17 by welding. The grounding wire connection seat 17 is connected to the transformer body by a connecting wire. The transformer requires that all the connection points of the components be connected across the grounding wire to play an equipotential role.

[0028] The working principle of a corrugated inner oil storage cabinet provided in an embodiment of the present invention is as follows: The volume change of the transformer oil in the oil tank is adapted to by synchronously extending and contracting a plurality of bellows core bodies 3 upward and downward. When the bellows core body 3 expands beyond the high oil level and is about to reach its height limit, the limiting mechanism 9 abuts against the top inner surface of the oil storage cabinet shell 1. The limiting mechanism 9 can limit the bellows core body 3 from further expansion and causing damage.

[0029] Through the cooperation of the oil level indication observation window 13 and the oil level warning mechanism 16, the oil level change in the bellows core body 3 can be conveniently and intuitively observed. The ambient temperature scale mark is set with several typical temperature points such as -10°C, +20°C and +40°C, and the oil level scale mark is set with several typical oil point points such as lower limit (0), upper limit (100%), 20%, 40%, 60% and 80%. The oil level is closely related to the ambient temperature. When the ambient temperature is -10°C, the optimal oil level height is slightly lower than the 20% scale, when the ambient temperature is +20°C, the optimal oil level height is slightly higher than the 40% scale, and when the ambient temperature is +40°C, the optimal oil level height is slightly lower than the 60% scale.

[0030] The pressure relief pipe 7 is connected to the pressure release valve 8 as a directional pressure relief pipeline, and directional oil discharge and pressure relief are performed when the internal pressure of the bellows core 3 exceeds the set pressure value. The pressure relief pipe 7 and the pressure release valve 8 are mainly set to play a fault-tolerant function. Because the internal structure principle may not be clear, the on-site staff may make mistakes during oil filling or pressure testing, resulting in oil filling exceeding 100% or continued pressure testing exceeding the standard pressure value, causing the internal pressure of the bellows core 3 to rise sharply. At this time, the pressure relief pipe 7 and the pressure release valve 8 automatically open to release pressure to avoid damage to the bellows core 3.

[0031] The corrugated internal oil type oil storage cabinet provided in the embodiment of the present invention changes the number of bellows from one to three. If one bellows is used to compensate for the total oil capacity, under certain demand conditions, the diameter of the bellows will be too large or the height will be too high, because the bellows is limited by the mold and the height cannot be increased indefinitely. If the bellows are too high, they will be unstable and there will be processing barriers on the external shell. Therefore, the existing bellows usually have about 40 corrugations. By setting three bellows core bodies 3, the embodiment of the present invention reduces the processing difficulty of the bellows core body 3, which not only meets the total oil capacity compensation requirements, but also avoids the oil storage cabinet being too high (too high will cause the bellows core body to operate unstably and increase the risk of oil leakage) and too wide (too wide will affect the discharge distance of the transformer bushing), greatly improving the technical performance of the corrugated internal oil type oil storage cabinet.

[0032] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0033] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A corrugated inner oil conservator, comprising a conservator shell of a rectangular structure, a bellows located in the conservator shell, the bellows comprising a bellows core, the bellows core is welded to an upper cover plate and a lower cover plate for sealing, characterized in that: An oil level digital display screen and a pair of cabinet bases are installed at the bottom of the oil storage cabinet shell, and a junction box is installed on the cabinet base. Several bellows are evenly installed side by side in the length direction of the oil storage cabinet shell, and a distance sensor is installed on the outside of one of the bellows cores. The top pull wire matched with the distance sensor is fixed above the upper cover plate corresponding to the bellows core. The junction box is electrically connected to the distance sensor and the oil level digital display screen; several limit mechanisms are arranged above the upper cover plate corresponding to each bellows core; a pressure relief valve is installed above the upper cover plate corresponding to one of the bellows cores, one end of the pressure relief valve is connected to the inside of the bellows core, and the other end of the pressure relief valve is connected to one end of the pressure relief pipe, and the other end of the pressure relief pipe passes through the oil storage cabinet shell and is led to the bottom of the oil storage cabinet shell and fixed.

2. A corrugated inner oil storage tank according to claim 1, characterized in that: The pressure relief pipe comprises a corrugated hose and a steel pipe. The main body of the pressure relief pipe is made of the steel pipe, and the corrugated hose is used at the joint between the upper end of the main body of the pressure relief pipe and the pressure relief valve.

3. The corrugated inner oil storage tank according to claim 1, characterized in that: The top ends of the several bellows core bodies are connected through an exhaust connecting pipe, which includes an exhaust steel pipe and an exhaust hose. The exhaust steel pipe is connected to the interior of the bellows core body through a connector, and adjacent exhaust steel pipes are connected through an exhaust hose. A branch pipe joint is led out from one section of the exhaust steel pipe, and the top end of the exhaust pipe is sealed and connected to the branch pipe joint, and the bottom end of the exhaust pipe passes through the bottom of the oil conservator shell and is led to the bottom of the oil conservator shell for fixation.

4. A corrugated inner oil storage tank according to claim 3, characterized in that: An exhaust valve is installed at the bottom end of the exhaust pipe, and the exhaust valve is in a normally closed state.

5. The corrugated inner oil storage tank according to claim 1, characterized in that: The main connecting pipe is fixedly installed under the bottom of the oil storage cabinet shell. The main connecting pipe is sealed and connected with the inside of several bellows core bodies respectively. One end of the oil filling pipe is sealed and connected with the main connecting pipe, and the other end of the oil filling pipe is equipped with an oil filling valve.

6. The corrugated inner oil storage tank according to claim 1, characterized in that: A high and low oil level alarm device is fixedly installed inside the oil storage cabinet shell, and the high and low oil level alarm device includes an oil level alarm rod and a travel switch. The lower end of the oil level alarm rod is fixedly installed in the gap between adjacent bellows core bodies, and mounting holes are provided at the upper and lower parts of the oil level alarm rod. The travel switch is installed in the mounting hole. The travel switch includes a travel switch body and an alarm trigger rod. The alarm trigger rod of the upper travel switch is installed above the upper cover plate, and the alarm trigger rod of the lower travel switch is installed in the gap between two adjacent corrugations. The travel switch body is electrically connected to the junction box.

7. The corrugated inner oil storage tank according to claim 1, characterized in that: A rubber pad is fixedly mounted on the upper surface of the limiting mechanism.

8. The corrugated inner oil storage tank according to claim 1, characterized in that: A vertical oil level indication observation window is provided on the side of the oil conservator shell, and the oil level indication observation window is sealed with a transparent plate. Ambient temperature scale marks and oil level scale marks are respectively provided on the outer surface of the oil conservator shell on both sides of the oil level indication observation window, and an oil level warning mechanism is provided on the outer surface of the corrugated tube core corresponding to the oil level indication observation window.

9. The corrugated inner oil storage tank according to claim 1, characterized in that: A grounding wire connection seat is fixedly arranged on the cabinet base, and the grounding wire connection seat is connected to the transformer body.

10. A corrugated inner oil storage tank according to any one of claims 1 to 9, characterized in that: A plurality of reinforcing ribs are arranged on the top length direction of the oil conservator shell, and arc structures are provided at both ends of the length direction of the oil conservator shell to match the bellows core body. A fixed connecting plate made of a rigid material is installed between the plurality of bellows core bodies, and both ends of the fixed connecting plate are fixedly installed above the upper cover plates corresponding to the adjacent bellows core bodies.

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