An internal-oil type corrugated oil tank capable of balancing internal pressure

Abstract

This utility model relates to an internally mounted corrugated oil tank capable of balancing internal pressure. It includes a tank shell and a corrugated pipe. A support plate is fixedly connected inside the tank shell. The lower end of the corrugated pipe is fixedly connected to the support plate. An annular cavity is formed between the outer wall of the corrugated pipe and the tank shell. Multiple guiding and balancing mechanisms are evenly distributed within the annular cavity. Each guiding and balancing mechanism includes a piston cylinder, a piston, a piston rod, and a fixed seat. The piston cylinder is vertically fixed within the annular cavity, and the piston is slidably disposed within the piston cylinder. The piston rod is fixed to the upper end face of the piston. The fixed seat is fixed to the upper end of the piston rod and to the upper end face of the corrugated pipe. The inner cavity of the piston cylinder below the piston communicates with the inner cavity of the corrugated pipe, and the inner cavity of the piston cylinder above the piston communicates with the inner cavity of the tank shell. This utility model effectively avoids the tilting of the upper end face caused by pressure imbalance within the corrugated pipe through the support and balancing of the guiding and balancing mechanisms.

Description

Technical Field

[0001] This utility model relates to the technical field of metal corrugated internal oil storage tanks, specifically to an internal oil corrugated oil storage tank that can balance internal pressure. Background Technology

[0002] Power transformers, as devices connecting networks of different voltage levels, are a crucial component of power systems, widely used in power generation, transmission, and distribution. Transformers are typically connected to oil conservators, which supply insulating oil to the transformer. Currently, with the increasing use of corrugated metal oil conservators in high-voltage, high-capacity transformers, increasingly stringent requirements are being placed on the operational safety and stability of these conservators. In a corrugated (internal oil) sealed oil conservator, when the temperature of the insulating oil inside the transformer changes, the volume change of the insulating oil is compensated for by the "expansion-contraction" of the corrugated core.

[0003] When the current corrugated internal oil conservator is in use, when the oil level is below 0, the elasticity of the corrugated pipe will generate negative pressure inside, causing the upper end of the corrugated pipe to tilt and lose balance when it expands and contracts, resulting in air intake into the transformer and affecting the transformer performance. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing an internally-oiled corrugated oil tank that can balance internal pressure, effectively preventing the upper surface from tilting due to pressure imbalance inside the corrugated pipe.

[0005] This utility model is achieved through the following technical solution: an internal oil-type corrugated oil tank that can balance internal pressure, including a cabinet shell and a corrugated pipe. A support plate is fixedly connected inside the cabinet shell, and the lower end of the corrugated pipe is fixedly connected to the support plate. An annular cavity is formed between the outer wall of the corrugated pipe and the cabinet shell, and multiple guiding and balancing mechanisms are evenly distributed in the annular cavity. The guiding and balancing mechanism includes a piston cylinder, a piston, a piston rod, and a fixed seat. The piston cylinder is vertically fixed in an annular cavity, and the piston is slidably disposed in the piston cylinder. The piston rod is fixed to the upper end face of the piston, and the fixed seat is fixed to the upper end of the piston rod and to the upper end face of the bellows. The inner cavity of the piston cylinder below the piston is connected to the inner cavity of the bellows, and the inner cavity of the piston cylinder above the piston is connected to the inner cavity of the cabinet shell.

[0006] As an optimization, a roller is rotatably mounted on the fixed base, and the roller contacts the outer shell of the cabinet.

[0007] As an optimization, the piston cylinder cavity below the piston is connected to the bellows cavity via a connecting pipe.

[0008] As an optimization, a receiving cavity is formed between the support plate and the inner bottom of the cabinet shell, and the connecting pipe is located in the receiving cavity. One end of the connecting pipe is connected to the lower end face of the piston cylinder, and the other end is connected to the lower end face of the bellows.

[0009] As an optimization, the connecting pipe has a U-shaped structure.

[0010] As an optimization, a vent hole is provided on the upper end face of the piston cylinder.

[0011] As an optimization, a sealing ring is fixed to the outer wall of the piston, and the sealing ring is in sealing contact with the inner wall of the piston cylinder.

[0012] As an optimization, the number of the guiding and balancing mechanisms is four, and the four guiding and balancing mechanisms are arranged in pairs, with the two groups of guiding and balancing mechanisms symmetrically distributed on both sides of the long axis of the bellows.

[0013] The beneficial effects of this utility model are as follows: when the piston of the guide balancing mechanism slides up and down, it drives the fixed seat to move up and down through the piston rod, which in turn drives the upper end face of the bellows to move up and down.

[0014] The piston is connected to the inside of the bellows via a connecting pipe at the bottom and to the air inside the outer shell of the tank at the top. When the oil level drops or rises above 0, the positive or negative pressure caused by the elasticity of the bellows causes it to expand or contract. The piston's sliding position is adjusted by the pressure difference, which causes the fixed seat to suppress the vertical displacement of the upper end face of the bellows until the pressure on both sides of the piston is balanced. This achieves the effect of balancing the internal pressure, ensuring that the oil tank is in balance with atmospheric pressure during operation, thus increasing the safety and stability of the oil tank operation.

[0015] When the fixed base moves up and down, it is limited by the contact between the rollers and the cabinet shell, ensuring stable up and down movement. Furthermore, the upper end face of the corrugated pipe is symmetrically equipped with four guide and balancing mechanisms that contact the cabinet shell, providing stable support to both sides of the corrugated pipe and effectively preventing the upper surface from tilting due to pressure imbalance inside the corrugated pipe. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 This is a top sectional view of the present invention; Figure 4 for Figure 2 Enlarged view of part A; As shown in the figure: 1. Cabinet shell, 2. Corrugated pipe, 3. Guide and balance mechanism, 31. Piston cylinder, 32. Piston, 33. Sealing ring, 34. Piston rod, 35. Fixed seat, 36. Roller, 37. Vent hole, 38. Connecting pipe, 4. Support plate, 5. Annular cavity, 6. Receiving cavity. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] like Figures 1-4 As shown, an internally corrugated oil conservator with balanced internal pressure includes a cabinet shell 1 and a bellows 2. A support plate 4 is fixed inside the cabinet shell 1, and the lower end of the bellows 2 is fixed to the support plate 4. An annular cavity 5 is formed between the outer wall of the bellows 2 and the cabinet shell 1. Both the cabinet shell 1 and the bellows 2 are flattened oval structures, so the annular cavity 5 formed by them is also a flattened oval cavity. The inner cavity of the cabinet shell 1 is connected to the outside air, and the air pressure inside the cabinet shell 1 is balanced with the outside atmosphere to ensure the free expansion and contraction of the bellows 2. An oil injection and discharge pipe is fixed to the lower end of the bellows 2 for injecting oil into the transformer, and an oil vent pipe is fixed to the upper end of the bellows 2 for discharging internal air during oil injection. This is the conventional structure of existing internally corrugated oil conservators, and will not be described in detail here.

[0019] Since the lower end face of the bellows 2 is fixed to the support plate 4, the upper end face of the bellows 2 is in a free state, allowing the bellows 2 to expand and contract with changes in the temperature of the insulating oil, thus achieving volume compensation. However, when the oil level is below 0, the elasticity of the bellows 2 will generate negative pressure inside, and the upper end face of the bellows 2 is prone to tilting and losing balance when expanding and contracting, which will affect the performance of the transformer.

[0020] Therefore, to improve the balance of the upper end face of the bellows 2, multiple guiding and balancing mechanisms 3 are evenly distributed within the annular cavity 5. In this embodiment, there are four guiding and balancing mechanisms 3, arranged in pairs, with the two pairs symmetrically distributed on both sides of the long axis of the bellows 2. The four symmetrically arranged guiding and balancing mechanisms 3 provide stable support to both sides of the bellows 2, improving its balance and stability.

[0021] Specifically, the guiding and balancing mechanism 3 includes a piston cylinder 31, a piston 32, a piston rod 34, and a fixed seat 35. The piston cylinder 31 is vertically fixed in the annular cavity 5, the piston 32 is slidably disposed in the piston cylinder 31, the piston rod 34 is fixedly connected to the upper end face of the piston 32, and the fixed seat 35 is fixedly connected to the upper end of the piston rod 34 and to the upper end face of the bellows 2. The inner cavity of the piston cylinder 31 below the piston 32 communicates with the inner cavity of the bellows 2, and the inner cavity of the piston cylinder 31 above the piston 32 communicates with the inner cavity of the cabinet shell 1.

[0022] In this embodiment, the piston cylinder 31 is fixedly connected to the support plate 4 to secure the piston cylinder 31. A sealing ring 33 is fixedly connected to the outer wall of the piston 32, and the sealing ring 33 makes sealing contact with the inner wall of the piston cylinder 31. The sealing ring 33 improves the sealing performance when the piston 32 slides, ensuring a sealing effect.

[0023] In this embodiment, a roller 36 is rotatably mounted on the fixed base 35, and the roller 36 contacts the outer shell 1 of the cabinet. Since four fixed bases 35 are fixed to the upper end face of the bellows 2, and these four fixed bases 35 abut against the outer shell 1 of the cabinet through the rollers 36, the upper end face of the bellows 2 is supported and limited, further improving the expansion and contraction stability of the upper end face of the bellows 2. Simultaneously, this ensures that the piston 32 remains stable when sliding up and down along the piston cylinder 31, reducing resistance and making the sliding smoother.

[0024] In this embodiment, the inner cavity of the piston cylinder 31 below the piston 32 is connected to the inner cavity of the bellows 2 via a connecting pipe 38. A receiving cavity 6 is formed between the support plate 4 and the inner bottom of the cabinet shell 1. The connecting pipe 38 is located within the receiving cavity 6 and has a U-shaped structure. One end of the connecting pipe 38 is connected to the lower end face of the piston cylinder 31, and the other end is connected to the lower end face of the bellows 2. The connecting pipe 38 enables communication between the inner cavity of the piston cylinder 31 below the piston 32 and the inner cavity of the bellows 2.

[0025] In this embodiment, a vent hole 37 is provided on the upper end face of the piston cylinder 31. The vent hole 37 enables communication between the inner cavity of the piston cylinder 31 above the piston 32 and the inner cavity of the cabinet outer shell 1.

[0026] Working principle: When the oil level drops or rises above 0, the positive or negative pressure caused by the elasticity of the bellows 2 causes it to expand or contract. Due to the pressure difference between the air pressure inside the outer shell 1 and the internal pressure of the bellows 2, the piston 32 automatically slides and adjusts its position through the pressure difference. This causes the fixed seat 35 to suppress the vertical displacement of the upper end face of the bellows 2 until the pressure on both sides of the piston 32 is balanced, thereby achieving the effect of balancing the internal pressure.

[0027] When the bellows 2 extends or retracts, its stable up-and-down movement is limited by the contact between the rollers 36 on the fixed seat 35 and the outer shell 1 of the cabinet. By symmetrically setting four guide balancing mechanisms 3 in contact with the outer shell 1, stable support is provided for both sides of the bellows 2, effectively avoiding the tilting of the upper end face caused by the internal pressure imbalance of the bellows 2, thus increasing the safety and stability of the oil tank operation.

[0028] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. An internally-operated corrugated oil tank capable of balancing internal pressure, comprising a tank shell (1) and a corrugated pipe (2), wherein a support plate (4) is fixedly connected inside the tank shell (1), the lower end of the corrugated pipe (2) is fixedly connected to the support plate (4), and an annular cavity (5) is formed between the outer wall of the corrugated pipe (2) and the tank shell (1), characterized in that: Multiple guiding and balancing mechanisms (3) are evenly distributed inside the annular cavity (5); The guiding and balancing mechanism (3) includes a piston cylinder (31), a piston (32), a piston rod (34), and a fixed seat (35). The piston cylinder (31) is vertically fixed in the annular cavity (5). The piston (32) is slidably disposed in the piston cylinder (31). The piston rod (34) is fixed to the upper end face of the piston (32). The fixed seat (35) is fixed to the upper end of the piston rod (34) and fixed to the upper end face of the bellows (2). The inner cavity of the piston cylinder (31) below the piston (32) is connected to the inner cavity of the bellows (2). The inner cavity of the piston cylinder (31) above the piston (32) is connected to the inner cavity of the cabinet shell (1).

2. The internally-oiled corrugated oil tank with balanced internal pressure according to claim 1, characterized in that: A roller (36) is rotatably mounted on the fixed base (35), and the roller (36) is in contact with the outer shell (1) of the cabinet.

3. The internally-oiled corrugated oil tank with balanced internal pressure according to claim 1, characterized in that: The inner cavity of the piston cylinder (31) below the piston (32) is connected to the inner cavity of the bellows (2) through the connecting pipe (38).

4. The internally-oiled corrugated oil tank with balanced internal pressure according to claim 3, characterized in that: The support plate (4) and the inner bottom of the cabinet shell (1) form a receiving cavity (6). The connecting pipe (38) is located in the receiving cavity (6). One end of the connecting pipe (38) is connected to the lower end face of the piston cylinder (31), and the other end is connected to the lower end face of the corrugated pipe (2).

5. The internally-oiled corrugated oil tank capable of balancing internal pressure according to claim 4, characterized in that: The connecting pipe (38) has a U-shaped structure.

6. The internally-oiled corrugated oil tank capable of balancing internal pressure according to claim 1, characterized in that: The piston cylinder (31) has a vent hole (37) on its upper end face.

7. The internally-oiled corrugated oil tank with balanced internal pressure according to claim 1, characterized in that: A sealing ring (33) is fixed to the outer wall of the piston (32), and the sealing ring (33) is in sealing contact with the inner wall of the piston cylinder (31).

8. The internally-oiled corrugated oil conservator capable of balancing internal pressure according to any one of claims 1 to 7, characterized in that: The number of the guide balancing mechanism (3) is four. The four guide balancing mechanisms (3) are arranged in pairs, and the two groups of guide balancing mechanisms are symmetrically distributed on both sides of the long axis of the bellows (2).

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