A kind of oil-immersed transformer pressure maintaining seal detection device

Abstract

The application discloses an oil-immersed transformer pressure-maintaining sealing detection device, and relates to the technical field of detection devices, which comprises a transformer body, an oil storage tank arranged on the outer surface of the transformer body, and a preliminary survey assembly arranged on the outer surface of the transformer body and used for preliminarily detecting whether the inner wall of the oil storage tank is slightly damaged. When the infrared measuring instrument detects that there is a suspicious gap in the outer wall of the oil storage tank, the negative pressure bin can be inserted into the inside of the oil storage tank, rotated in all directions to face the suspicious small gap in the inner wall of the oil storage tank, and moved to tightly adhere to the inner wall of the oil storage tank, so that the oil stain at the position is cleaned by heating and negative pressure, and then the mixed gas of helium and fluorescent powder is delivered into the sealing space, the fluorescent powder is driven by the helium to pass through the inner wall of the oil storage tank along the small gap and adhere to the outer surface of the oil storage tank.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of detection devices, in particular to an oil-immersed transformer pressure-maintaining sealing detection device. BACKGROUND

[0002] The oil-immersed transformer is a transformer using oil as insulation and cooling medium, and the main structure of the oil-immersed transformer comprises a core, a winding, an oil tank and a cooling device. The working principle of the oil-immersed transformer is the same as that of other transformers, that is, based on the electromagnetic induction law, when alternating current passes through the primary winding of the transformer, an alternating magnetic field is generated, the alternating magnetic field is transmitted to the secondary winding through the core, and alternating voltage is induced in the secondary winding, so that the transformation of voltage is realized. The oil-immersed transformer pressure-maintaining sealing detection device is mainly used for detecting the sealing performance of the transformer to ensure that the transformer does not leak oil during operation. The working principle is based on the stability monitoring of air pressure and oil pressure. By applying a certain pressure to the inside of the transformer and observing the pressure change, it is judged whether the sealing performance meets the standard.

[0003] The existing oil-immersed transformer pressure-maintaining sealing detection device is mainly used for detecting the sealing condition of the oil tank part of the transformer. The sealing detection device mainly fills a certain pressure gas into the oil tank to observe the pressure drop to judge the leakage. However, during long-term operation of the transformer, the insulating oil is affected by high temperature, electric field and oxygen factors and will undergo oxidation reaction to generate oil sludge, acid and gum aging products. These substances are sticky and easy to deposit in the gap. Since the existing pressure-maintaining sealing detection device mainly detects whether there is oil leakage by detecting the pressure change to judge the sealing performance of the oil tank, the oil stain will block the gap and hinder the oil leakage and pressure release. In addition, the gap is difficult to find, so that the detection device cannot accurately detect the existence of the gap, resulting in false negative results, that is, the oil tank is mistakenly considered to be tightly sealed, but in fact there is a gap hidden danger, which affects the normal operation of the transformer in the later period.

[0004] Therefore, the oil-immersed transformer pressure-maintaining sealing detection device is proposed to solve the above problems. SUMMARY

[0005] The oil-immersed transformer pressure-maintaining sealing detection device is provided to solve the problem that the oil-immersed transformer pressure-maintaining sealing detection device cannot detect the existence of the gap in the oil tank when detecting the sealing condition of the oil tank.

[0006] In order to achieve the above object, the present application provides the following technical scheme: An oil-immersed transformer pressure maintenance sealing detection device, comprising a transformer body, an oil storage tank is arranged on the outer surface of the transformer body, a preliminary survey assembly for preliminarily detecting whether the inner wall of the oil storage tank is damaged is arranged on the outer surface of the transformer body, a deep cleaning assembly for cleaning the inner wall of the oil storage tank is arranged on the outer surface of the preliminary survey assembly, the deep cleaning assembly comprises a negative pressure bin, two heating wires for liquefying solid oil stains on the inner wall of the oil storage tank are arranged on the inner wall of the negative pressure bin, a waste tank for negative pressure adsorption and collection of liquefied oil stains is coupled and arranged on the outer surface of the negative pressure bin near one side edge, a marking assembly for displaying micro cracks is arranged on the outer surface of the negative pressure bin near the other side edge, the marking assembly comprises a sealed tank for storing helium, a leak hole box for storing fluorescent powder is arranged on the inner wall of the sealed tank, and a conveying pipe is fixedly connected to the outer surface of the sealed tank; when the helium is output outward through the sealed tank, the fluorescent powder in the leak hole box is mixed with the helium under the impact of the gas and is conveyed to the inside of the negative pressure bin through the conveying pipe, and the micro damaged part of the inner wall of the oil storage tank is marked.

[0007] Preferably, the deep cleaning assembly further comprises a first hydraulic rod, a lifting plate is fixedly installed at the top end of the first hydraulic rod, two limiting tubes are slidably connected to the inner wall of the lifting plate, the bottom of each of the two limiting tubes is fixedly connected to the top of an auxiliary plate, the outer surface of the first hydraulic rod is fixedly connected to the top of the auxiliary plate through a screw, and a bent pipe is fixedly installed at the top of the lifting plate near the center.

[0008] Preferably, a servo motor is arranged at the bottom end of the bent pipe, a rotating shaft is fixedly connected to the output end of the servo motor, a connecting frame is fixedly sleeved on the outer surface of the rotating shaft, a connecting shaft is movably embedded in the connecting frame, a driven gear ring is fixedly sleeved on the outer surface of the connecting shaft, a pressure-resistant frame is fixedly installed on the outer surface of the connecting frame, a stepping motor is arranged on the inner wall of the pressure-resistant frame, and a positioning tube is fixedly connected to the output end of the stepping motor.

[0009] Preferably, one end of the positioning tube is movably embedded in the connecting frame, a driving gear ring is fixedly sleeved on the outer surface of the positioning tube, the outer surface of the driving gear ring is meshingly connected with the outer surface of the driven gear ring, a second hydraulic rod is arranged at the bottom of the connecting shaft, the bottom end of the second hydraulic rod is fixedly connected to the top of the negative pressure bin, and the bottom end of the waste tank is fixedly connected to the outer surface of the negative pressure bin.

[0010] Preferably, the inside of the negative pressure bin is provided with a fan through an auxiliary rod, one side of the outer surface of the negative pressure bin is fixedly provided with a negative pressure pump through screws, the input end of the negative pressure pump is fixedly communicated with a negative pressure pipe, one end of the negative pressure pipe is fixedly penetrated into the inside of the negative pressure bin, the output end of the negative pressure pump is fixedly communicated with a recovery pipe, and one end of the recovery pipe is fixedly penetrated into the inside of the waste tank.

[0011] Preferably, the bottom end of the sealing tank is fixedly connected with the outer surface of the negative pressure bin through screws, the inside bottom surface of the sealing tank is provided with a first cylinder, the top end of the first cylinder is fixedly connected with a piston, the piston is arranged in the inside of the sealing tank, and the top of the piston is provided with a pressure sensor.

[0012] Preferably, the inner wall of the sealing tank is provided with a second cylinder through an auxiliary block, the top end of the second cylinder is fixedly provided with a sealing piece, the outer surface of the sealing piece is in sliding connection with the inner wall of the sealing tank, the bottom end of the conveying pipe is fixedly penetrated into the inside of the negative pressure bin, and the outer surface of the conveying pipe is provided with a solenoid valve.

[0013] Preferably, the preliminary survey assembly comprises a base frame, the transformer body is arranged at the top of the base frame, the outer surface of the base frame is fixedly connected with the outer surface of the auxiliary plate, the top of the base frame is fixedly provided with an extension rod near one side edge, the top end of the extension rod is fixedly connected with an arc-shaped frame, and the top of the base frame is provided with a plurality of electric push rods near the other side edge.

[0014] Preferably, the top end of the electric push rod is fixedly connected with the bottom of the arc-shaped frame, the top of the arc-shaped frame is fixedly provided with an arc-shaped rack, the outer surface of the arc-shaped frame is in sliding connection with a sliding frame, the inside of the sliding frame is coupled with a positioning rod, one end of the positioning rod is provided with an infrared measuring instrument, the inside of the sliding frame is provided with a gear, and the outer surface of the sliding frame is fixedly provided with a driving motor through screws.

[0015] Preferably, the output end of the driving motor is fixedly connected with a driving shaft, the two ends of the driving shaft are movably penetrated into the opposite outer parts of the sliding frame, the outer surface of the driving shaft is fixedly connected with the inner wall of the gear, the outer surface of the gear is in meshing connection with the outer surface of the arc-shaped rack, and the outer surface of the sliding frame is in sliding connection with the inner wall of the arc-shaped frame.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1、When the infrared measuring instrument detects that there is a suspicious gap in the outer wall of the oil storage tank, the negative pressure bin can be inserted into the inside of the oil storage tank, and rotated to face the suspicious small gap in the inner wall of the oil storage tank, and the negative pressure bin is moved to tightly adhere to the inner wall of the oil storage tank, and the oil stain at the position is cleaned by heating and negative pressure, and then the mixed gas of helium and fluorescent powder is transported into the sealed space, and the fluorescent powder will pass through the inner wall of the oil storage tank along the small gap under the driving of the helium, and adhere to the outer surface of the oil storage tank, and the worker can detect whether there is a small gap by detecting whether there is fluorescent powder on the outer wall of the oil storage tank, thereby solving the problem that the oil-immersed transformer pressure maintaining sealing detection device in the prior art cannot detect the small gap caused by oil stain plugging when detecting the sealing condition of the oil tank.

[0018] 2、When detecting the pressure maintaining sealing condition in the oil-immersed transformer oil storage tank, in order to prevent oil stain from plugging the gap and making the detection device unable to accurately detect the existence of the gap, first, the driving motor and the multi-stage electric push rod are started, the infrared measuring instrument is driven to rotate around the outer wall of the oil storage tank, the infrared measurement of the outer wall of the oil storage tank is performed, and whether there is a suspicious small gap in the outer wall of the oil storage tank is detected, so that the worker does not need to conduct comprehensive and accurate survey on the inner wall of the oil storage tank when detecting whether there is a small gap in the outer wall of the oil storage tank, and the subsequent detection task is facilitated.

[0019] 3、In order to realize the sufficient mixing between the helium and the fluorescent powder, when the helium needs to be transported into the negative pressure bin, the helium in the sealed tank is first pressurized, and when the pressure sensor detects that the pressure of the helium in the sealed tank reaches a specified value, the sealing member is separated from the leak hole box, so that the helium is mixed with the fluorescent powder through the leak hole box, and the mixed helium and fluorescent powder are transported outward along the conveying pipe under the action of the pressure difference, thereby realizing the sufficient mixing between the helium and the fluorescent powder, and preventing the insufficient transportation of the fluorescent powder in the later stage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front view of the oil-immersed transformer pressure maintaining sealing detection device of the application;

[0021] Figure 2 It is a partial perspective view of the preliminary survey assembly of the oil-immersed transformer pressure maintaining sealing detection device of the application;

[0022] Figure 3 It is a partial cross-sectional perspective view of the preliminary survey assembly of the oil-immersed transformer pressure maintaining sealing detection device of the application;

[0023] Figure 4 It is a partial cross-sectional perspective view of the arc-shaped rack of the oil-immersed transformer pressure maintaining sealing detection device of the application;

[0024] Figure 5It is oil tank part perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0025] Figure 6 It is deep cleaning assembly part perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0026] Figure 7 It is negative pressure bin part perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0027] Figure 8 It is anti-pressure frame part structure development perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0028] Figure 9 It is recovery pipe part perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0029] Figure 10 It is fan part perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0030] Figure 11 It is waste tank part cutaway perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application;

[0031] Figure 12 It is marking assembly part structure development perspective view of the oil immersed transformer pressure maintaining sealing detection device of the application.

[0032] In the figure:

[0033] 1, transformer body; 2, oil storage tank; 3, preliminary survey assembly; 301, base frame; 302, telescopic rod; 303, multi-stage electric push rod; 304, arc-shaped frame; 305, arc-shaped rack; 306, sliding frame; 307, positioning rod; 308, infrared measuring instrument; 309, driving motor; 310, driving shaft; 311, gear; 4, deep cleaning assembly; 401, first hydraulic rod; 402, lifting plate; 403, limiting tube; 404, elbow; 405, servo motor; 406, rotating shaft; 407, connecting frame; 408, connecting shaft; 409, driven gear ring; 410, anti-pressure frame; 411, stepping motor; 412, positioning tube; 413, driven gear ring; 414, waste tank; 415, second hydraulic rod; 416, negative pressure bin; 417, heating wire; 418, fan; 419, negative pressure pump; 420, negative pressure pipe; 421, recovery pipe; 5, marking assembly; 501, sealing tank; 502, first cylinder; 503, piston; 504, pressure sensor; 505, second cylinder; 506, sealing element; 507, leakage hole box; 508, conveying pipe; 509, electromagnetic valve. DETAILED DESCRIPTION

[0034] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0035] Please refer to Figures 1-4 The present application provides a technical solution: an oil-immersed transformer pressure-maintaining sealing detection device, a preliminary survey assembly 3 includes a base frame 301, a transformer body 1 is arranged on the top of the base frame 301, the outer surface of the base frame 301 is fixedly connected with the outer surface of an auxiliary plate, a telescopic rod 302 is fixedly arranged on the top of the base frame 301 near one side edge, the top end of the telescopic rod 302 is fixedly connected with an arc-shaped frame 304, a plurality of electric push rods 303 are arranged on the top of the base frame 301 near the other side edge, the top end of the plurality of electric push rods 303 is fixedly connected with the bottom of the arc-shaped frame 304, an arc-shaped rack 305 is fixedly arranged on the top of the arc-shaped frame 304, a sliding frame 306 is slidingly connected with the outer surface of the arc-shaped frame 304, a positioning rod 307 is coupled and connected in the sliding frame 306, an infrared measuring instrument 308 is arranged on one end of the positioning rod 307, a gear 311 is arranged in the sliding frame 306, a driving motor 309 is fixedly installed on the outer surface of the sliding frame 306 through screws, a driving shaft 310 is fixedly connected with the output end of the driving motor 309, the two ends of the driving shaft 310 are movably penetrated into the opposite outer portions of the sliding frame 306, the outer surface of the driving shaft 310 is fixedly connected with the inner wall of the gear 311, the outer surface of the gear 311 is meshingly connected with the outer surface of the arc-shaped rack 305, and the outer surface of the sliding frame 306 is slidingly connected with the inner wall of the arc-shaped frame 304.

[0036] In the embodiment, when detecting the pressure-maintaining sealing condition of the oil-immersed transformer oil tank 2, first, the external pressure-maintaining sealing detection equipment is used to fill a certain pressure gas into the oil tank 2, and the pressure drop amplitude is observed to determine the leakage. In the process of detecting the tiny gap in the oil tank 2, in order to prevent the oil stain from blocking the gap and making the detection device unable to accurately detect the existence of the gap, first, the transformer body 1 is placed on the base frame 301 as Figure 1The top of the base frame 301 is shown, and then the drive motor 309 is started, driving the drive shaft 310 to rotate, and in turn driving the gear 311 to rotate, so that the gear 311 moves along the outer surface of the arc-shaped rack 305, and the infrared measuring instrument 308 is started, and the outer wall of the oil tank 2 is measured by the infrared measuring instrument 308, to detect whether there is a suspicious small gap in the outer wall of the oil tank 2. When there is a small gap in the transformer oil tank 2 that is blocked by oil stains, the thermal conductivity characteristics at the gap will change due to the presence of oil stains, and the infrared measuring instrument 308 can still indirectly detect the temperature anomaly caused by the local thermal resistance difference. When the gap is partially blocked, the oil stain does not completely fill the gap, and there is still a small channel. At this time, the gap on both sides will generate a dynamic heat effect due to oil penetration. When the gap is completely sealed by oil stains and isolated from the internal oil, only a static thermal resistance difference is present at this time, forming a low-temperature spot, and it can be detected whether there is a small gap in the inner wall of the oil tank 2 at this position. After the measurement on the same horizontal line on the outer wall of the oil tank 2 is completed, the multi-stage electric push rod 303 is started to extend or shorten, driving the arc-shaped frame 304 to move upwards or downwards, and in turn driving the infrared measuring instrument 308 to move upwards or downwards, while rotating along the outer wall of the oil tank 2 in all directions, to measure whether there is a suspicious small gap in the outer wall of the oil tank 2. Through the action of the preliminary survey assembly 3, the worker does not need to conduct comprehensive and accurate survey of the inner wall of the oil tank 2 when detecting whether there is a small gap in the outer wall of the oil tank 2, which facilitates the subsequent detection task.

[0037] As Figure 1 and Figures 5-12As shown, a kind of oil-immersed transformer pressure maintaining sealing detection device, including transformer body 1, the outer surface of transformer body 1 is provided with oil tank 2, the outer surface of transformer body 1 is provided with the preliminary survey component 3 for the preliminary detection whether there is small breakage in the inner wall of oil tank 2, the outer surface of preliminary survey component 3 is provided with the depth cleaning component 4 for cleaning the inner wall of oil tank 2, depth cleaning component 4 includes negative pressure bin 416, the inner wall of negative pressure bin 416 is provided with two heating wires 417 for heating liquefaction of solid oil dirt in the inner wall of oil tank 2, the outer surface of negative pressure bin 416 is coupled and is provided with waste tank 414 for the negative pressure adsorption collection of liquefied oil dirt near one side edge, the outer surface of negative pressure bin 416 is provided with marking component 5 for the display of small crack near the other side edge, marking component 5 includes sealed tank 501 for storing helium, the inner wall of sealed tank 501 is provided with leakage hole box 507 for storing fluorescent powder, the outer surface of sealed tank 501 is fixedly connected with conveying pipe 508, when helium is outputted outward through sealed tank 501, fluorescent powder in leakage hole box 507 is mixed with helium under the ramming of gas and is conveyed to the inside of negative pressure bin 416 through conveying pipe 508, and the small breakage in the inner wall of oil tank 2 is marked, depth cleaning component 4 further includes first hydraulic rod 401, the top end of first hydraulic rod 401 is fixedly installed with lifting plate 402, the inner wall of lifting plate 402 is slidably connected with two limit tubes 403, the bottom of two limit tubes 403 is fixedly connected with the top of auxiliary plate, the outer surface of first hydraulic rod 401 is fixedly connected with the top of auxiliary plate by screw, the top of lifting plate 402 is fixedly installed with elbow pipe 404 near the center, the bottom end of elbow pipe 404 is provided with servo motor 405, the output end of servo motor 405 is fixedly connected with rotating shaft 406, the outer surface of rotating shaft 406 is fixedly sleeved with connecting frame 407, connecting frame 407 is movably embedded with connecting shaft 408, the outer surface of connecting shaft 408 is fixedly sleeved with driven gear ring 409, the outer surface of connecting frame 407 is fixedly installed with pressure-resistant frame 410, the inner wall of pressure-resistant frame 410 is provided with step motor 411, the output end of step motor 411 is fixedly connected with positioning tube 412, one end of positioning tube 412 is movably embedded in the inside of connecting frame 407, the outer surface of positioning tube 412 is fixedly sleeved with driving gear ring 413, the outer surface of driving gear ring 413 is meshingly connected with the outer surface of driven gear ring 409, the bottom of connecting shaft 408 is provided with second hydraulic rod 415, the bottom end of second hydraulic rod 415 is fixedly connected with the top of negative pressure bin 416, the bottom end of waste tank 414 is fixedly connected with the outer surface of negative pressure bin 416, the inside of negative pressure bin 416 is provided with fan 418 through auxiliary rod, the outer surface of one side of negative pressure bin 416 is fixedly installed with negative pressure pump 419 by screw, the input end of negative pressure pump 419 is fixedly connected with negative pressure pipe 420, one end of negative pressure pipe 420 is fixedly penetrated to the inside of negative pressure bin 416, the output end of negative pressure pump 419 is fixedly connected with recovery pipe 421,One end of the recovery pipe 421 is fixedly penetrated into the inside of the waste tank 414, the bottom end of the sealing tank 501 is fixedly connected with the outer surface of the negative pressure bin 416 through screws, the inside bottom surface of the sealing tank 501 is provided with the first air cylinder 502, the top end of the first air cylinder 502 is fixedly connected with the piston 503, the piston 503 is arranged in the inside of the sealing tank 501, the top of the piston 503 is provided with the pressure sensor 504, the inner wall of the sealing tank 501 is provided with the second air cylinder 505 through an auxiliary block, the top end of the second air cylinder 505 is fixedly connected with the sealing piece 506, the outer surface of the sealing piece 506 is in sliding connection with the inner wall of the sealing tank 501, the bottom end of the conveying pipe 508 is fixedly penetrated into the inside of the negative pressure bin 416, the outer surface of the conveying pipe 508 is provided with the electromagnetic valve 509.

[0038] In this embodiment, when the infrared measuring instrument 308 detects that there is a gap in the outer wall of the oil storage tank 2, in order to accurately locate the gap and prevent oil stains from blocking and being difficult to find, the staff can manually open the sealing cover at the top of the oil storage tank 2, and then start the first hydraulic rod 401 to make it shorter, drive the negative pressure bin 416 to move downward to the inside of the oil storage tank 2, then start the servo motor 405 to drive the rotating shaft 406 to rotate, and then drive the connecting frame 407 to rotate, at the same time, start the stepping motor 411 to drive the positioning pipe 412 to rotate, and then drive the driving gear ring 413 to rotate, the rotation of the driving gear ring 413 drives the driven gear ring 409 to rotate, and then drives the connecting shaft 408 to rotate, thereby driving the negative pressure bin 416 to rotate in all directions, when the opening of the negative pressure bin 416 is rotated to be opposite to the suspicious small gap in the inner wall of the oil storage tank 2, the servo motor 405 and the stepping motor 411 can be closed, then the second hydraulic rod 415 is started to make it longer, drive the negative pressure bin 416 to move to the inner wall of the oil storage tank 2, until the outer surface of the negative pressure bin 416 tightly fits the inner wall of the oil storage tank 2, then the two heating wires 417 can be respectively electrically connected with the external power supply to release heat outward, thereby increasing the temperature in the sealed space between the negative pressure bin 416 and the inside of the oil storage tank 2, so as to heat and soften the solid oil stains attached to the inner wall of the oil storage tank 2, reduce the adhesion of the oil stains to the inner wall of the oil storage tank 2, at the same time, start the fan 418 to speed up the flow of hot gas in the negative pressure bin 416, and start the negative pressure pump 419 to drive the negative pressure pipe 420 to extract gas into the inside of the negative pressure bin 416, so that the negative pressure bin 416 is in a state of negative pressure, thereby collecting the oil stains sealed in the negative pressure bin 416 into the inside of the waste tank 414 under the action of negative pressure, realizing the removal of suspicious position dirt, preventing the oil stains from covering the small gap and making it difficult to detect whether there is a small gap, after the oil stain cleaning is completed, the first air cylinder 502 can be started to make it longer, drive the piston 503 to move upward, thereby pressurizing the helium gas in the sealing tank 501, the helium gas is used for precise positioning of extremely fine leakage by using its small molecule characteristics, high diffusion capacity and low environmental background concentration, the characteristics of the helium gas make it become an ideal leak detection gas molecule, which is small and easy to pass through the small gap, the diameter of the helium gas molecule is only 0.26nm, smaller than air molecules, even through the micron 1 to 10 pm gap, and helium is inert gas, and does not react with the insulating oil in the oil tank 2, metal material, also will not produce condensation and deposition in the detection process, avoid the secondary damage to the equipment, when the pressure sensor 504 detects the gas pressure of the sealed tank 501 reaches the specified value, the first cylinder 502 can be closed, wherein the working principle of the pressure sensor 504 detecting the pressure value in the sealed tank 501 is based on the deformation of the elastic element, the pressure signal is converted into an electrical signal, and then the readable data is output through the signal processing circuit, which is a mature technology, and will not be described in detail. At the same time, the second cylinder 505 is started to shorten, which drives the sealing element 506 to move downward to separate the bottom of the leak hole box 507, so that the helium in the sealed tank 501 enters the inside of the leak hole box 507 through the small hole in the leak hole box 507, and mixes with the fluorescent powder in the leak hole box 507. The mixed helium and fluorescent powder are transported outward along the conveying pipe 508 under the action of pressure difference, and the electromagnetic valve 509 is opened, so that the mixed gas enters the closed space formed by the negative pressure bin 416 and the inner wall of the oil tank 2. If there is a small gap in the inner wall of the oil tank 2 at this time, the fluorescent powder will be driven by the helium along the small gap to pass through the inner wall of the oil tank 2 and adhere to the outer surface of the oil tank 2. The worker can detect whether there is a small gap in the oil tank 2 by detecting whether there is fluorescent powder on the outer wall of the oil tank 2. Through the cooperation between the deep cleaning assembly 4 and the marking assembly 5, the oil-immersed transformer pressure sealing detection device can accurately detect the small gap in the oil tank 2 and display it. It does not need to fill helium into the oil tank 2, which reduces the cost and prevents the small gap blocked by oil from being difficult to detect, solving the problem that the oil-immersed transformer pressure sealing detection device in the prior art is difficult to detect the small gap blocked by oil during the detection of the oil tank, which affects the normal operation of the transformer later.

[0039] The use method and working principle of the device: when detecting the pressure sealing condition of the oil-immersed transformer oil tank 2, first fill a certain pressure gas into the oil tank 2 through the external pressure sealing detection equipment, and observe the pressure drop to judge the leakage. In order to prevent the oil from blocking the gap and making the detection device unable to accurately detect the existence of the gap during the detection of the small gap in the oil tank 2, first place the transformer body 1 in the Figure 1The top of the base frame 301 is shown, and then the drive motor 309 is started to drive the drive shaft 310 to rotate, and then drive the gear 311 to rotate, so that the gear 311 moves along the outer surface of the arc-shaped rack 305, and the infrared measuring instrument 308 measures the outer wall of the oil tank 2, detects whether there is a small gap in the outer wall of the oil tank 2, when there is a small gap in the transformer oil tank 2 blocked by oil stains, the heat conduction characteristics at the gap will change due to the presence of oil stains, and the infrared measuring instrument 308 can still indirectly detect the temperature anomaly caused by the local thermal resistance difference, when the gap is partially blocked, the oil stain does not completely fill the gap, and there is still a small channel, at this time the gap on both sides will generate a dynamic heat effect due to oil penetration, when the gap is completely sealed by the oil stain and isolated from the internal oil, at this time only a static thermal resistance difference is formed, a low temperature spot is formed, and whether there is a small gap in the inner wall of the oil tank 2 at this position can be detected, when the measurement on the same horizontal line of the outer wall of the oil tank 2 is completed, the multi-stage electric push rod 303 can be started to be elongated or shortened, driving the arc-shaped frame 304 to move upwards or downwards, and then driving the infrared measuring instrument 308 to move upwards or downwards, while rotating along the outer wall of the oil tank 2 in all directions, so that the worker does not need to conduct comprehensive and accurate investigation on the inner wall of the oil tank 2 when detecting whether there is a small gap in the outer wall of the oil tank 2, when the infrared measuring instrument 308 detects that there is a small gap in the outer wall of the oil tank 2, the worker can manually open the sealing cover at the top of the oil tank 2, and then start the first hydraulic rod 401 to be shortened, driving the negative pressure bin 416 to move downwards to the inside of the oil tank 2, then start the servo motor 405 to drive the rotating shaft 406 to rotate, and then drive the connecting frame 407 to rotate, and at the same time start the stepping motor 411 to drive the positioning pipe 412 to rotate, and then drive the driving gear ring 413 to rotate, the driving gear ring 413 drives the driven gear ring 409 to rotate, and then drives the connecting shaft 408 to rotate, thereby driving the negative pressure bin 416 to rotate in all directions, when the opening of the negative pressure bin 416 is rotated to be opposite to the suspicious small gap in the inner wall of the oil tank 2, the servo motor 405 and the stepping motor 411 can be closed, wherein the servo motor 405 and the stepping motor 411 both have self-locking function, then start the second hydraulic rod 415 to be elongated, driving the negative pressure bin 416 to move towards the inner wall of the oil tank 2, until the outer surface of the negative pressure bin 416 tightly abuts against the inner wall of the oil tank 2, such as Figure 10As shown, the position of the negative pressure bin 416 in contact with the inner wall of the oil storage tank 2 is provided with a ring of sealing ring, which is made of rubber material, has strong sealing performance, improves the sealing strength of the negative pressure bin 416 and the inner wall of the oil storage tank 2, and then the two heating wires 417 are respectively electrically connected with the external power supply, so that they release heat outward, so that the temperature in the closed space between the negative pressure bin 416 and the inside of the oil storage tank 2 rises, thereby heating and softening the solid oil stains attached to the inner wall of the oil storage tank 2, reducing the adhesion of the oil stains to the inner wall of the oil storage tank 2, and simultaneously starting the fan 418 to speed up the flow of hot gas in the negative pressure bin 416, and simultaneously starting the negative pressure pump 419 to drive the negative pressure pipe 420 to extract gas from the inside of the negative pressure bin 416, so that the negative pressure bin 416 is in a state of negative pressure, thereby the oil stains sealed in the negative pressure bin 416 are under the action of negative pressure and enter the inside of the waste tank 414 along the negative pressure pipe 420 to be collected. After the oil stain cleaning is completed, the first cylinder 502 can be started to elongate and drive the piston 503 to move upward, thereby pressurizing the helium gas in the sealing tank 501. Helium gas is used for precise positioning of extremely fine leaks due to its small molecular characteristics, high diffusion capacity and low environmental background concentration. The characteristics of helium gas make it an ideal leak detection gas molecule, which is small and easy to pass through a small gap. The diameter of helium gas molecule is only 0.26 nm, smaller than that of air molecule, and even can pass through a micron-level 1-10 μm gap. Helium is an inert gas and does not react with insulating oil and metal materials in the oil storage tank 2, and will not produce condensation and deposition during the detection process, avoiding secondary damage to the equipment. When the pressure sensor 504 detects that the pressure of the helium gas in the sealing tank 501 reaches a specified value, the first cylinder 502 can be closed, and the second cylinder 505 can be started to shorten and drive the sealing member 506 to move downward to separate from the bottom of the leak hole box 507, thereby allowing the helium gas in the sealing tank 501 to enter the inside of the leak hole box 507 through the small holes in the leak hole box 507 and mix with the fluorescent powder in the leak hole box 507. The mixed helium gas and fluorescent powder are transported outward along the conveying pipe 508 under the action of pressure difference. At the same time, the electromagnetic valve 509 is opened to allow the mixed gas to enter the closed space between the negative pressure bin 416 and the inner wall of the oil storage tank 2. If there is a small gap in the inner wall of the oil storage tank 2 at this time, the fluorescent powder will be driven by the helium gas to pass through the inner wall of the oil storage tank 2 along the small gap and adhere to the outer surface of the oil storage tank 2. The workers can detect whether there is a small gap in the oil storage tank 2 by detecting whether there is fluorescent powder on the outer wall of the oil storage tank 2. Through the cooperation between the deep cleaning assembly 4 and the marking assembly 5, the oil-immersed transformer pressure-maintaining sealing detection device can accurately detect the small gap in the oil storage tank 2.

[0040] The wiring diagram of the transformer body 1, the multi-stage electric push rod 303, the infrared measuring instrument 308, the driving motor 309, the first hydraulic rod 401, the stepping motor 411, the second hydraulic rod 415, the heating wire 417, the fan 418, the negative pressure pump 419, the first air cylinder 502, the pressure sensor 504, the second air cylinder 505 and the electromagnetic valve 509 in the application belongs to the common knowledge in the art, and the working principle is the known technology, and the model is selected according to the actual use, so the control mode and the wiring arrangement of the transformer body 1, the multi-stage electric push rod 303, the infrared measuring instrument 308, the driving motor 309, the first hydraulic rod 401, the stepping motor 411, the second hydraulic rod 415, the heating wire 417, the fan 418, the negative pressure pump 419, the first air cylinder 502, the pressure sensor 504, the second air cylinder 505 and the electromagnetic valve 509 will not be explained in detail.

[0041] Although the application has been described in detail with reference to the foregoing embodiments, technical solutions recorded in the foregoing embodiments can be modified or some technical features can be replaced by equivalent ones by those skilled in the art, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An oil-immersed transformer pressure-maintenance seal detection device, comprising a transformer body (1), an oil storage tank (2) is arranged on the outer surface of the transformer body (1), a preliminary survey assembly (3) for preliminarily detecting whether the inner wall of the oil storage tank (2) has a slight damage is arranged on the outer surface of the transformer body (1), characterized in that: The outer surface of the preliminary survey assembly (3) is provided with a deep cleaning assembly (4) for cleaning the inner wall of the oil storage tank (2), the deep cleaning assembly (4) comprises a negative pressure bin (416), the inner wall of the negative pressure bin (416) is provided with two heating wires (417) for liquefying the solid oil stains on the inner wall of the oil storage tank (2), and the outer surface of the negative pressure bin (416) is coupled to a waste tank (414) near one side edge for negative pressure adsorption and collection of liquefied oil stains; The outer surface of the negative pressure bin (416) is provided with a marking assembly (5) for displaying micro cracks near the other side edge, the marking assembly (5) comprises a sealed tank (501) for storing helium, the inner wall of the sealed tank (501) is provided with a leak hole box (507) for storing fluorescent powder, the outer surface of the sealed tank (501) is fixedly connected with a conveying pipe (508), when the helium is outputted outward through the sealed tank (501), the fluorescent powder in the leak hole box (507) is mixed with the helium under the ramming of the gas and is conveyed to the inside of the negative pressure bin (416) through the conveying pipe (508), and the micro damage of the inner wall of the oil storage tank (2) is marked.

2. The oil-immersed transformer pressure-maintenance seal detection device according to claim 1, characterized by: The deep cleaning assembly (4) further comprises a first hydraulic rod (401), the top end of the first hydraulic rod (401) is fixedly installed with a lifting plate (402), the inner wall of the lifting plate (402) is slidably connected with two limiting tubes (403), the bottom of each of the two limiting tubes (403) is fixedly connected with the top of an auxiliary plate, the outer surface of the first hydraulic rod (401) is fixedly connected with the top of the auxiliary plate through screws, and the top of the lifting plate (402) is fixedly installed with an elbow pipe (404) near the center.

3. The oil-immersed transformer pressure-maintenance seal detection device according to claim 2, characterized by: The bottom end of the elbow pipe (404) is provided with a servo motor (405), the output end of the servo motor (405) is fixedly connected with a rotating shaft (406), the outer surface of the rotating shaft (406) is fixedly sleeved with a connecting frame (407), the inner part of the connecting frame (407) is movably embedded with a connecting shaft (408), the outer surface of the connecting shaft (408) is fixedly sleeved with a driven gear ring (409), the outer surface of the connecting frame (407) is fixedly installed with a pressure-resistant frame (410), the inner wall of the pressure-resistant frame (410) is provided with a stepping motor (411), and the output end of the stepping motor (411) is fixedly connected with a positioning tube (412).

4. The oil-immersed transformer pressure-maintenance seal detection device according to claim 3, characterized by: One end of the positioning tube (412) is movably embedded in the inner part of the connecting frame (407), the outer surface of the positioning tube (412) is fixedly sleeved with a driving gear ring (413), the outer surface of the driving gear ring (413) is meshingly connected with the outer surface of the driven gear ring (409), the bottom of the connecting shaft (408) is provided with a second hydraulic rod (415), the bottom end of the second hydraulic rod (415) is fixedly connected with the top of the negative pressure bin (416), and the bottom end of the waste tank (414) is fixedly connected with the outer surface of the negative pressure bin (416).

5. The oil-immersed transformer pressure-maintenance seal detection device according to claim 4, characterized by: The inside of the negative pressure bin (416) is provided with a fan (418) through an auxiliary rod, one side outer surface of the negative pressure bin (416) is fixedly provided with a negative pressure pump (419) through screws, an input end of the negative pressure pump (419) is fixedly communicated with a negative pressure pipe (420), one end of the negative pressure pipe (420) penetrates into the inside of the negative pressure bin (416), and an output end of the negative pressure pump (419) is fixedly communicated with a recovery pipe (421).

6. The oil-immersed transformer pressure-maintenance seal detection device according to claim 5, characterized by: The bottom end of the sealed tank (501) is fixedly connected with the outer surface of the negative pressure bin (416) through screws, the inside bottom surface of the sealed tank (501) is provided with a first air cylinder (502), the top end of the first air cylinder (502) is fixedly connected with a piston (503), the piston (503) is arranged in the inside of the sealed tank (501), and the top of the piston (503) is provided with a pressure sensor (504).

7. The oil-immersed transformer pressure-maintenance seal detection device according to claim 6, characterized by: The inner wall of the sealed tank (501) is provided with a second air cylinder (505) through an auxiliary block, the top end of the second air cylinder (505) is fixedly provided with a sealing element (506), the outer surface of the sealing element (506) slides with the inner wall of the sealed tank (501), the bottom end of the conveying pipe (508) penetrates into the inside of the negative pressure bin (416), and the outer surface of the conveying pipe (508) is provided with a solenoid valve (509).

8. The oil-immersed transformer pressure-maintenance seal detection device according to claim 7, characterized by: The preliminary survey assembly (3) comprises a base frame (301), the transformer body (1) is arranged on the top of the base frame (301), the outer surface of the base frame (301) is fixedly connected with the outer surface of an auxiliary plate, the top of the base frame (301) is fixedly provided with a telescopic rod (302) near one side edge, the top end of the telescopic rod (302) is fixedly connected with an arc-shaped frame (304), and the top of the base frame (301) is provided with a multi-stage electric push rod (303) near the other side edge.

9. The oil-immersed transformer pressure-maintenance seal detection device according to claim 8, characterized by: The top end of the multi-stage electric push rod (303) is fixedly connected with the bottom of the arc-shaped frame (304), the top of the arc-shaped frame (304) is fixedly provided with an arc-shaped rack (305), the outer surface of the arc-shaped frame (304) is slidably connected with a sliding frame (306), the inside of the sliding frame (306) is coupled with a positioning rod (307), one end of the positioning rod (307) is provided with an infrared measuring instrument (308), the inside of the sliding frame (306) is provided with a gear (311), and the outer surface of the sliding frame (306) is fixedly provided with a driving motor (309) through screws.

10. The oil-immersed transformer pressure-maintenance seal detection device according to claim 9, characterized by: The output end of the driving motor (309) is fixedly connected with a driving shaft (310), the two ends of the driving shaft (310) are movably penetrated into the opposite outer parts of the sliding frame (306), the outer surface of the driving shaft (310) is fixedly connected with the inner wall of the gear (311), the outer surface of the gear (311) is meshingly connected with the outer surface of the arc-shaped rack (305), and the outer surface of the sliding frame (306) slides with the inner wall of the arc-shaped frame (304).

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