Improved internal oil type metal corrugated oil conservator with double-sealing structure

Abstract

The utility model relates to a metal corrugated sealing type oil conservator for an oil-immersed transformer, in particular to an improved inner oil type metal corrugated oil conservator with a double-sealing structure, which comprises an outer cover, a corrugated core body, an oil level gauge and an observation sight glass, the bottom of the corrugated core body is installed on a bottom plate of the outer cover, and a limiting supporting frame used for limiting the unfolding height of the corrugated core body is arranged on the lower surface of an upper cover of the outer cover. One end of the exhaust pipeline is communicated with the inside of the corrugated core body, the other end of the exhaust pipeline penetrates out of the bottom plate to be communicated with the atmosphere, one end of the breathing pipeline is communicated with a sealed air cavity formed between the corrugated core body and the outer cover, the other end of the breathing pipeline penetrates out of the bottom plate to be communicated with the atmosphere, the main connecting pipeline is communicated with the inside of the corrugated core body, and the oil injection pipeline is installed on the main connecting pipeline. According to the utility model, the state of the corrugated core body of the oil conservator in the processes of positive pressure detection, vacuum oil injection and daily operation can be directly checked through the observation sight glass, so that problems can be found and solved early.

Description

Technical Field

[0001] The utility model relates to a metal corrugated sealed oil storage cabinet for an oil-immersed transformer, in particular to an improved inner-oil metal corrugated oil storage cabinet with a double-sealed structure. Background Art

[0002] In order to meet the technical requirements that the internal oil type metal corrugated oil conservator should be able to undergo positive pressure sealing testing together with the transformer oil tank, a double-sealed internal oil type metal corrugated oil conservator has emerged in the oil conservator industry, such as Figure 2 As shown, the corrugated core 8 is connected to the transformer oil tank through its lower main connecting pipe 12 to form a sealed oil cavity; the outer surface of the corrugated core 8 and the inner surface of the sealed outer cover form a sealed air cavity, and the air cavity is connected to the atmosphere through the breathing pipe 10. The valve 15 installed on the breathing pipe 10 controls the opening and closing of the air cavity. The operation process is: when the internal oil type metal corrugated oil storage cabinet and the transformer are tested for 0.04-0.06MPa pressure sealing, it is necessary to fill the air cavity of the oil storage cabinet with 0.1MPa clean gas through the breathing pipe 10 in advance, so that the corrugated core 8 is in a completely closed state, and the valve 15 on the breathing pipe 10 is closed; because the detection pressure value of the oil cavity of the oil storage cabinet is always lower than the pressure value of the air cavity, therefore, during the detection process, it can be ensured that the corrugated core 8 is always in a closed state without damage. After the detection, the valve 15 on the breathing pipe 10 is opened to make the air cavity communicate with the atmosphere.

[0003] The above-mentioned existing internal oil type metal corrugated oil conservator has been actually used and operated in transformer factories and on-site, and it is found that there are the following deficiencies: (1) The outer cover 4 of the oil conservator is a closed structure, and the surrounding body is all plate material. During the inspection, oil filling or operation of the oil conservator, the real-time status of the internal corrugated core 8 cannot be visually viewed, and it is impossible to directly judge whether the corrugated core 8 is in a closed state or in good condition; (2) When the oil conservator and the transformer are tested for sealing together, there is a risk that the user does not inflate the air cavity in advance, resulting in overpressure in the oil cavity of the corrugated core 8, and the flexible corrugated core 8 is fully unfolded, which may cause the corrugated core 8 to be damaged. Utility Model Content

[0004] Aiming at the above-mentioned problems existing in the existing double-sealed internal oil type metal corrugated oil conservator during transformer application, the utility model aims to provide an improved double-sealed internal oil type metal corrugated oil conservator.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The utility model comprises an outer cover and a corrugated core installed inside the outer cover, and a breathing pipeline and a main connecting pipeline are respectively installed on the outer cover; it also comprises an oil level gauge and an observation mirror located outside the outer cover for observing the state of the corrugated core, and the oil level gauge and the observation mirror are respectively installed on the outer cover; the bottom of the corrugated core is installed on the bottom plate of the outer cover, and the lower surface of the upper cover of the outer cover is provided with a limiting support frame for limiting the unfolding height of the corrugated core; one end of the exhaust pipeline is connected with the interior of the corrugated core, and the other end of the exhaust pipeline passes through the bottom plate and communicates with the atmosphere, one end of the breathing pipeline is connected with a sealed air cavity formed between the corrugated core and the outer cover, and the other end of the breathing pipeline passes through the bottom plate and communicates with the atmosphere, the main connecting pipeline is connected with the interior of the corrugated core, and the oil filling pipeline is installed on the main connecting pipeline.

[0007] Wherein: a core reinforcement ring is installed on the corrugated core.

[0008] The observation mirror includes a cylinder, a cylinder flange, a window glass and a pressure plate. One end of the cylinder is installed on the outer cover, and the other end of the cylinder is fixedly connected to the cylinder flange. The pressure plate is connected to the cylinder flange. A window glass is sandwiched between the cylinder flange and the pressure plate. The window glass is sealed with the cylinder flange and the pressure plate respectively.

[0009] The pressure plate is an annular plate, which is fixed to the cylinder flange by multiple bolts. The opposite surfaces of the cylinder flange and the pressure plate are respectively provided with sealing grooves. Sealing gaskets are accommodated in the sealing grooves of the cylinder flange and the sealing grooves of the pressure plate. The window glass is located between the sealing gasket of the cylinder flange and the sealing gasket of the pressure plate.

[0010] The oil level gauge is installed above one side of the axial cross section of the outer cover, and the observation mirror is installed below the other side of the axial cross section of the outer cover.

[0011] There are one or more corrugated cores. When there are multiple corrugated cores, one end of the exhaust pipe is divided into multiple paths, which are respectively connected to the upper part of each corrugated core, and one end of the main connecting pipe is divided into multiple paths, which are respectively connected to the lower part of each corrugated core, and the other end of the main connecting pipe is connected to the oil filling pipe.

[0012] A maintenance flange is provided on the upper surface of the upper cover.

[0013] The advantages and positive effects of the utility model are:

[0014] 1. The utility model is provided with an oil level gauge and an observation mirror on the outer cover of the oil conservator. The state of the corrugated core of the oil conservator during positive pressure detection, vacuum oil filling and daily operation can be directly checked through the observation mirror, which is conducive to early detection and early resolution of problems.

[0015] 2. The utility model adds a core reinforcement ring to the corrugated core to enhance the rigidity of the corrugated core and reduce the risk of damaging the corrugated core due to negligent operation and failure to fill the air cavity with gas in advance during the positive pressure detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the internal structure of an existing internal oil type metal corrugated oil storage cabinet with a double sealing structure;

[0018] Figure 3 This is a schematic diagram of the structure of the observation mirror of the utility model;

[0019] Among them: 1 is an oil level gauge, 2 is a maintenance flange, 3 is an upper cover, 4 is an outer cover, 5 is a fixing frame, 6 is a limit support frame, 7 is an exhaust pipe, 8 is a corrugated core, 9 is a core reinforcement ring, 10 is a breathing pipe, 11 is an oil filling pipe, 12 is a main connecting pipe, 13 is a bottom plate, 14 is an observation mirror, 1401 is a cylinder, 1402 is a cylinder flange, 1403 is a sealing gasket, 1404 is a mirror glass, 1405 is a pressure plate, 1406 is a bolt, and 15 is a valve. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the utility model includes an outer cover 4 and a corrugated core 8 installed inside the outer cover 4, and also includes an oil level gauge 1 and an observation mirror 14 located outside the outer cover 4 for observing the state of the corrugated core 8, and the oil level gauge 1 and the observation mirror 14 are respectively installed on the outer cover 4; the bottom of the corrugated core 8 is installed on the bottom plate 13 of the outer cover 4, the upper surface of the upper cover 3 of the outer cover 4 is provided with a maintenance flange 2, and the lower surface is provided with a limit support frame 6 for limiting the unfolding height of the corrugated core 8; one end of the exhaust pipe 7 is connected to the inner surface of the corrugated core 8 The other end of the exhaust pipe 7 passes through the bottom plate 13 and communicates with the atmosphere; the breathing pipe 10 is installed on the bottom plate 13 of the outer cover 4, one end of the breathing pipe 10 is connected to the sealed air cavity formed between the corrugated core 8 and the outer cover 4, and the other end of the breathing pipe 10 passes through the bottom plate 13 to the bottom of the oil storage cabinet and communicates with the atmosphere; the main connecting pipe 12 is installed on the bottom plate 13 of the outer cover 4, the main connecting pipe 12 is connected to the inside of the corrugated core 8, and the oil filling pipe 11 is installed on the main connecting pipe 12.

[0022] There are one or more corrugated cores 8. When there are multiple corrugated cores 8, one end of the exhaust pipe 7 is divided into multiple paths, which are respectively connected to the upper part of each corrugated core 8, and one end of the main connecting pipe 12 is divided into multiple paths, which are respectively connected to the lower part of each corrugated core 8. The other end of the main connecting pipe 12 is connected to the oil filling pipe 11. In this embodiment, there are two corrugated cores 8, which are arranged side by side. The expansion and contraction direction of the two corrugated cores 8 is in the same direction as the height direction of the outer cover 4; one end of the exhaust pipe 7 is divided into two paths, which are respectively connected to the upper part of the two corrugated cores 8. One end of the breathing pipe 10 is located between the two corrugated cores 8, and one end of the main connecting pipe 12 is divided into two paths, which are respectively connected to the lower part of the two corrugated cores 8.

[0023] In this embodiment, a core reinforcement ring 9 is installed on each corrugated core 8 to enhance the rigidity of the corrugated core 8 . The number of core reinforcement rings 9 can be determined according to the size of the corrugated core 8 and the number of corrugations. In this embodiment, two core reinforcement rings 9 are installed on each corrugated core 8 .

[0024] The oil level gauge 1 of this embodiment is installed above one side of the axial section of the outer cover 4, and the observation mirror 14 is installed below the other side of the axial section of the outer cover 4. The oil level gauge 1 of this embodiment is a commercially available product purchased from Shenyang Special Electric Appliance Factory, model YZS2-250. The oil level gauge 1 has its own connecting rod, which is connected to the fixing frame 5 installed on the top of one of the corrugated cores 8.

[0025] like Figure 1 and Figure 3 As shown, the observation mirror 14 of this embodiment includes a cylinder 1401, a cylinder flange 1402, a window glass 1404 and a pressure plate 1405. One end of the cylinder 1401 is welded to the outer cover 4, and the other end of the cylinder 1401 is welded with the cylinder flange 1402. The pressure plate 1405 is connected to the cylinder flange 1402. The window glass 1404 is sandwiched between the cylinder flange 1402 and the pressure plate 1405. The window glass 1404 is sealed with the cylinder flange 1402 and the pressure plate 1405 respectively. The pressure plate 1405 of this embodiment is an annular plate, and a plurality of threaded holes are evenly arranged on the cylinder flange 1402 along the circumferential direction. The pressure plate 1405 is fixedly connected to the cylinder flange 1402 by a plurality of bolts 1406, and the number of the bolts 1406 and the threaded holes are the same and correspond one to one. The opposite surfaces of the cylinder flange 1402 and the pressure plate 1405 are respectively processed with sealing grooves, and sealing gaskets 1403 are accommodated in the sealing grooves of the cylinder flange 1402 and the sealing grooves of the pressure plate 1405, and the window glass 1404 is located between the sealing gasket 1403 of the cylinder flange 1402 and the sealing gasket 1403 of the pressure plate 1405.

Claims

1. An improved internal oil type metal corrugated oil storage cabinet with double sealing structure, comprising an outer cover (4) and a corrugated core (8) installed inside the outer cover (4), a breathing pipeline (10) and a main connecting pipeline (12) are respectively installed on the outer cover (4); characterized in that: The invention also comprises an oil level gauge (1) and an observation mirror (14) located outside the outer cover (4) and used for observing the state of the corrugated core (8); the oil level gauge (1) and the observation mirror (14) are respectively mounted on the outer cover (4); the bottom of the corrugated core (8) is mounted on the bottom plate (13) of the outer cover (4); the lower surface of the upper cover (3) of the outer cover (4) is provided with a limit support frame (6) for limiting the unfolding height of the corrugated core (8); one end of the exhaust pipe (7) is connected to the corrugated core (8) The interior of the core (8) is connected, the other end of the exhaust pipe (7) passes through the bottom plate (13) and communicates with the atmosphere, one end of the breathing pipe (10) is connected to the air cavity formed between the corrugated core (8) and the outer cover (4), the other end of the breathing pipe (10) passes through the bottom plate (13) and communicates with the atmosphere, the main connecting pipe (12) is connected to the interior of the corrugated core (8), and the oil filling pipe (11) is installed on the main connecting pipe (12).

2. According to the improved double-sealed internal oil type metal corrugated oil storage cabinet of claim 1, it is characterized by: A core reinforcement ring (9) is installed on the corrugated core (8).

3. According to the improved double-seal structure internal oil type metal corrugated oil storage cabinet of claim 1, it is characterized by: The observation mirror (14) comprises a cylinder (1401), a cylinder flange (1402), a window glass (1404) and a pressure plate (1405); one end of the cylinder (1401) is mounted on the outer cover (4); the other end of the cylinder (1401) is fixedly connected to the cylinder flange (1402); the pressure plate (1405) is connected to the cylinder flange (1402); a window glass (1404) is sandwiched between the cylinder flange (1402) and the pressure plate (1405); and the window glass (1404) is sealed with the cylinder flange (1402) and the pressure plate (1405), respectively.

4. According to claim 3, the improved internal oil type metal corrugated oil storage cabinet with double sealing structure is characterized in that: The pressure plate (1405) is an annular plate, which is fixed to the cylinder flange (1402) by multiple bolts (1406). The opposite surfaces of the cylinder flange (1402) and the pressure plate (1405) are respectively provided with sealing grooves, and the sealing grooves of the cylinder flange (1402) and the pressure plate (1405) are both provided with sealing gaskets (1403). The window glass (1404) is located between the sealing gasket (1403) of the cylinder flange (1402) and the sealing gasket (1403) of the pressure plate (1405).

5. According to the improved double-sealed internal oil type metal corrugated oil storage cabinet of claim 1, it is characterized by: The oil level gauge (1) is installed above one side of the axial cross section of the outer cover (4), and the observation mirror (14) is installed below the other side of the axial cross section of the outer cover (4).

6. The improved internal oil type metal corrugated oil storage cabinet with double sealing structure according to claim 1 is characterized in that: There are one or more corrugated cores (8). When there are more than one corrugated cores (8), one end of the exhaust pipe (7) is divided into multiple paths, which are respectively connected to the upper part of each of the corrugated cores (8); one end of the main connecting pipe (12) is divided into multiple paths, which are respectively connected to the lower part of each of the corrugated cores (8); and the other end of the main connecting pipe (12) is connected to the oil injection pipe (11).

7. The improved internal oil type metal corrugated oil storage cabinet with double sealing structure according to claim 1 is characterized in that: A maintenance flange (2) is provided on the upper surface of the upper cover (3).

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