A leak-proof vacuum drying device for oil-immersed transformers

Abstract

The present invention discloses a leak-proof oil-immersed transformer vacuum drying device, comprising a vacuum box, a regulating device, an auxiliary heating device and a vacuum pump. The vacuum pump is connected to the vacuum box, the vacuum box has a built-in regulating device, the auxiliary heating device is connected to the vacuum box pipeline, the regulating device is connected to the vacuum pump pipeline, the transformer is placed in the vacuum box, and the regulating device is used to conduct layered diversion of the vacuum drying gas. The vacuum box is used as the main installation body for installing other devices and providing space for vacuum drying of the transformer. The regulating device is a movable structure for conducting layered drying of the transformer. During the drying process, the transformer surface is automatically cleaned by diverting the gas. After the vacuum drying is completed, a hot air flow is introduced into the vacuum box through the auxiliary heating device for heating and drying to improve the drying quality. The vacuum pump is used as a vacuum manufacturing unit, and the negative pressure end is connected to the internal pipeline of the vacuum box.

Description

Technical Field

[0001] The invention relates to the technical field of transformer drying, in particular to a leakage-proof oil-immersed transformer vacuum drying device. Background Art

[0002] Transformers include oil-immersed transformers and dry-type transformers, which are generally used in high-voltage power distribution processes. Therefore, high requirements are placed on the sealing of the transformer itself. If the transformer itself is not sealed enough, it is easy to cause local sparks under the action of high voltage, affecting the service life of the transformer. Therefore, leakage detection is required.

[0003] Generally, when vacuum drying a transformer, overall drying is usually adopted. The transformer is placed in a fixed cavity and pumped by a vacuum pump to achieve the purpose of vacuum drying. However, due to the poor environmental quality of the transformer production and assembly workshop, impurities are easily adhered to the transformer locally, affecting the factory quality of the transformer. Conventional drying devices, due to their relatively single drying mode, cannot achieve the effect of automatic surface cleaning during the drying process. Summary of the invention

[0004] The object of the present invention is to provide a leakage-proof vacuum drying device for oil-immersed transformers to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A leak-proof oil-immersed transformer vacuum drying device, the vacuum drying device is used to vacuum dry the transformer, the vacuum drying device comprises a vacuum box, a regulating device, an auxiliary heating device and a vacuum pump, the vacuum pump is connected to the vacuum box, the vacuum box has a built-in regulating device, the auxiliary heating device is connected to the vacuum box pipeline, the regulating device is connected to the vacuum pump pipeline, the transformer is placed in the vacuum box, and the regulating device is used to conduct layered diversion of vacuum drying gas.

[0007] The vacuum box is the main installation body, used for installing other devices and providing space for vacuum drying of the transformer. The adjustment device is a movable structure, used for layered drying of the transformer. During the drying process, the surface of the transformer is automatically cleaned by diverting the gas. After the vacuum drying is completed, a hot air flow is introduced into the vacuum box through the auxiliary heating device for heating and drying to improve the drying quality. The vacuum pump serves as a vacuum manufacturing unit, and the negative pressure end is connected to the internal pipeline of the vacuum box.

[0008] Furthermore, the vacuum box includes a drying chamber, the transformer is placed in the drying chamber, a guide groove is provided on the vacuum box, the adjustment device includes a partition plate and a vertical module, the vertical module is placed in the guide groove, the movable end of the vertical module is fastened to the partition plate, and the partition plate is slidably connected to the drying chamber;

[0009] The partition plate includes a bottom plate, a transverse plate and a sealing plate. The middle part of the bottom plate is through-set. The cross-sectional area of ​​the through groove of the bottom plate is larger than the cross-sectional area of ​​the transformer. A slide groove is arranged on the bottom plate. The transverse plates and the sealing plates are symmetrically arranged in pairs. The transverse plates and the sealing plates arranged in groups are respectively slidably connected with the slide grooves. Drainage components are respectively arranged on the upper sides of the transverse plates and the sealing plates. The negative pressure end of the vacuum pump passes through the wall of the vacuum box and is connected with the drainage component pipeline.

[0010] A drying space is provided through a drying chamber, and the transformer is placed in the drying chamber. The vertical module is installed through the guide groove. The movable end of the vertical module is connected to the partition plate. The vertical module adopts the existing technology and can be in the form of an electric cylinder or a screw nut pair, which is used to drive the partition plate to move up and down, so as to facilitate gas drainage. The cross-sectional area of ​​the through groove in the middle of the bottom plate is larger than the cross-sectional area of ​​the transformer, so that the transformer can pass through the through groove. When layered drying is carried out, the partition plate is divided and the bottom plate is used as a bearing base. The horizontal plate and the sealing plate are slid and guided by the slide groove, so that when the horizontal plate and the sealing plate shrink toward the slide groove, they can shrink according to the surface of the transformer. The vacuum pump creates negative pressure on the upper side of the horizontal plate through the drainage component. The pressure on the lower side of the horizontal plate is greater than the pressure on the upper side. In the initial state, the horizontal plate is located at the most On the upper layer, by starting the vacuum pump, first evacuate the upper space of the horizontal plate. At this time, the two horizontal plates and the sealing plate are in contact with each other. After the upper end is evacuated, the horizontal plate and the sealing plate are driven to expand to the surroundings, and a channel is generated in the middle surrounded by the horizontal plate and the sealing plate. Under the action of the pressure difference, the airflow moves laterally along the upper surface from the circumference of the transformer, thereby removing impurities from the upper surface of the transformer. After the upper surface impurities are removed, when the middle channel surrounded by the horizontal plate and the sealing plate is larger than the cross-section of the transformer, the bottom plate is driven downward by the vertical module, so that the transformer on the upper side of the horizontal plate is always in a low-pressure state. Since the surface of the transformer is an irregular surface, under the action of the pressure difference, the gas will flow upward from the gap between the horizontal plate, the sealing plate and the transformer surface, providing vertical flow efficiency of the airflow, which is convenient for airflow impact removal of surface impurities.

[0011] Furthermore, the adjustment device also includes a transverse cylinder and a closing cylinder, the output end of the transverse cylinder is tightly connected to the transverse plate, the output end of the closing cylinder is tightly connected to the closing plate, the output directions of the transverse cylinder and the closing cylinder are perpendicular, and the cylinder bodies of the transverse cylinder and the closing cylinder are tightly connected to the wall surface of the slide groove respectively;

[0012] During vacuum drying: the bottom plate moves from top to bottom.

[0013] The transverse cylinder and the closing cylinder are fixed in the slide groove respectively. The transverse cylinder is used to drive the movement of the transverse plate, and the closing cylinder is used to drive the movement of the closing plate. The movement of the transverse plate and the closing plate is used to change the size of the middle enclosed channel, thereby guiding the gas flow direction on the upper surface and side wall of the transformer, impacting and removing impurities on the transformer surface, and improving the diversity of gas flow. During vacuum drying, the bottom plate is driven to move gradually from top to bottom through the vertical module to improve the quality of layered drying.

[0014] Furthermore, the drainage component includes a drainage tube, which is connected to the vacuum pump pipeline. Air nozzles are provided on the inner sides of the transverse plate and the sealing plate. The end of the drainage tube away from the vacuum pump is connected to the air nozzle.

[0015] The negative pressure end of the vacuum pump is connected to the drainage pipe, and the gas nozzles are respectively placed on the horizontal plate and the sealing plate. As the horizontal plate and the sealing plate move downward, the flow path of the vacuum drying gas is shortened and the drying efficiency is improved.

[0016] Furthermore, the regulating device also includes a pressure-sensitive component, a pressure-sensitive groove is provided on the horizontal plate, the pressure-sensitive groove is set in an "L" shape, the pressure-sensitive component includes a pressure-sensitive diaphragm, a fixed pole piece and a moving pole piece, the pressure-sensitive diaphragm is placed at the corner seal of the pressure-sensitive groove, and a moving pole piece is extended outward from the pressure-sensitive diaphragm, the fixed pole piece is tightly connected to the wall of the pressure-sensitive groove, the moving pole piece and the fixed pole piece are arranged alternately, and the moving pole piece and the fixed pole piece are respectively electrically connected to two wiring terminals of the power supply to form a detection circuit.

[0017] The pressure-sensitive component is set to detect the sealing of the transformer. When the vacuum drying reaches the end, the bottom plate moves to the bottom of the drying chamber. At this time, the vacuum drying is completed. Under the action of the vacuum pump, the pressure inside the drying chamber is the lowest, and one end of the pressure-sensitive groove is connected to the drying chamber. Under the action of the pressure difference, the pressure-sensitive diaphragm is an elastic sheet. When it is deformed, it moves the moving electrode sheet toward the fixed electrode sheet, so that the overlapping area between the fixed electrode sheet and the moving electrode sheet increases. As the cross-sectional area of ​​the overcurrent increases, the local resistance decreases. When the power supply outputs the rated voltage, the current value generated on the detection circuit is the largest. When the leakage prevention detection is performed, after reaching the minimum air pressure, the vacuum pump no longer evacuates the air, and the transformer remains stationary in the drying chamber for a period of time. When the transformer leaks, the fluid medium inside the transformer flows out and enters the drying chamber, so that the pressure in the drying chamber increases, and the pressure difference on both sides of the pressure-sensitive diaphragm decreases. Under the action of its own elasticity, the moving electrode sheet is driven to move away from the fixed electrode sheet. As the overlapping area decreases, the resistance increases, and the current on the detection circuit decreases, thereby detecting the leakage problem of the transformer.

[0018] Furthermore, the auxiliary heating device includes an air duct and a fan. The air duct is provided at the output end of the fan. The outlet of the air duct is placed at the bottom of the drying chamber. The air duct has a built-in electric heating wire.

[0019] The fan is used to compress the gas and send the compressed gas into the air duct. An electric heating wire is arranged inside the air duct to heat the compressed gas. After the heating is completed, the hot gas enters the drying chamber to perform auxiliary heat drying on the transformer.

[0020] As an optimization, the fan and the detection circuit are electrically connected;

[0021] During auxiliary heat drying: the bottom plate moves from bottom to top. During anti-leakage detection, if the current does not change, that is, if the current does not decrease, the fan will be automatically turned on to perform auxiliary heat drying. When the current decreases, that is, if leakage occurs, auxiliary heat drying will not be performed to ensure the safety of drying.

[0022] As an optimization, a sealing groove is provided on the transverse plate, and the sealing plate and the sealing groove are slidably connected. By providing the sealing groove, auxiliary guidance is provided for the sliding of the sealing plate, and the sealing plate can be stored during the centering movement.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: in the initial state of the present invention, the horizontal plate is located at the uppermost layer of the transformer, and by starting the vacuum pump, the upper space of the horizontal plate is evacuated first. At this time, the two horizontal plates and the sealing plate are in contact with each other. When the upper end is evacuated, the horizontal plate and the sealing plate are driven to expand to the surroundings, and a channel is generated in the middle surrounded by the horizontal plate and the sealing plate. Under the action of the pressure difference, the airflow moves laterally along the upper surface from the circumference of the transformer, thereby removing impurities from the upper surface of the transformer; after the upper surface impurities are removed, when the middle channel surrounded by the horizontal plate and the sealing plate is larger than the cross-section of the transformer, the bottom plate is driven downward by the vertical module, so that the transformer on the upper side of the horizontal plate is always in a low-pressure state. Since the surface of the transformer is an irregular surface, under the action of pressure difference, the gas will flow upward from the gap between the horizontal plate, the sealing plate and the transformer surface, providing vertical flow efficiency of the airflow, which is convenient for the airflow impact removal of surface impurities; changing the size of the middle enclosed channel to guide the gas flow direction of the upper surface and side wall of the transformer, impact and remove impurities on the transformer surface, and improve the diversity of gas flow. During vacuum drying, the bottom plate is driven to move gradually from top to bottom through the vertical module to improve the quality of layered drying; the negative pressure end of the vacuum pump is connected to the drainage pipe, and the gas nozzles are respectively placed on the horizontal plate and the sealing plate. As the horizontal plate and the sealing plate move downward, the vacuum drying gas flow path is shortened and the drying efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the layered drying structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the partition plate of the present invention;

[0028] Figure 4 It is a schematic diagram of the transverse contraction structure of the present invention;

[0029] Figure 5It is a schematic diagram of the transmission structure of the sealing cylinder and sealing plate of the present invention;

[0030] Figure 6 yes Figure 4 A magnified view of a part of the view;

[0031] Figure 7 yes Figure 2 A magnified view of a part B of the view;

[0032] In the figure: 1-vacuum box, 11-drying chamber, 12-guide groove, 2-adjusting device, 21-partition plate, 211-bottom plate, 212-cross plate, 2121-sealing groove, 2122-pressure-sensitive groove, 213-sealing plate, 22-drainage component, 221-drainage pipe, 222-air nozzle, 23-pressure-sensitive component, 231-pressure-sensitive diaphragm, 232-fixed pole piece, 233-moving pole piece, 24-transverse cylinder, 25-sealing cylinder, 26-vertical module, 3-auxiliary heating device, 31-air duct, 32-electric heating wire, 33-blower, 4-vacuum pump, 5-transformer. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides a technical solution:

[0035] like Figure 1 to Figure 7 As shown, a leak-proof oil-immersed transformer vacuum drying device is used to vacuum dry a transformer 5. The vacuum drying device includes a vacuum box 1, a regulating device 2, an auxiliary heating device 3 and a vacuum pump 4. The vacuum pump 4 is connected to the vacuum box 1. The regulating device 2 is built in the vacuum box 1. The auxiliary heating device 3 is connected to the vacuum box 1 through a pipeline. The regulating device 2 is connected to the vacuum pump 4 through a pipeline. The transformer 5 is placed in the vacuum box 1. The regulating device 2 is used to conduct layered diversion of the vacuum drying gas.

[0036] The vacuum box 1 is used as the main installation body for installing other devices and providing space for vacuum drying of the transformer 5. The adjustment device 2 is a movable structure for layered drying of the transformer 5. During the drying process, the surface of the transformer 5 is automatically cleaned by guiding the gas. After the vacuum drying is completed, a hot air flow is introduced into the vacuum box 1 through the auxiliary heating device for heating and drying to improve the drying quality. The vacuum pump 4 is used as a vacuum manufacturing unit, and the negative pressure end is connected to the internal pipeline of the vacuum box 1.

[0037] Further, the vacuum box 1 includes a drying chamber 11, the transformer 5 is placed in the drying chamber 11, the vacuum box 1 is provided with a guide groove 12, the adjustment device 2 includes a partition plate 21 and a vertical module 26, the vertical module 26 is placed in the guide groove 12, the movable end of the vertical module 26 is fastened to the partition plate 21, and the partition plate 21 is slidably connected to the drying chamber 11;

[0038] The partition plate 21 includes a bottom plate 211, a transverse plate 212 and a sealing plate 213. The bottom plate 211 is through-set in the middle, and the cross-sectional area of ​​the through groove of the bottom plate 211 is larger than the cross-sectional area of ​​the transformer 5. A slide groove is provided on the bottom plate 211, and the transverse plates 212 and the sealing plates 213 are symmetrically arranged in pairs. The transverse plates 212 and the sealing plates 213 arranged in groups are respectively slidably connected to the slide grooves. The drainage components 22 are respectively arranged on the upper sides of the transverse plates 212 and the sealing plates 213. The negative pressure end of the vacuum pump 4 passes through the wall of the vacuum box 1 and is connected to the drainage component 22 pipeline.

[0039] The drying chamber 11 provides a drying space, and the transformer 5 is placed in the drying chamber 11. The vertical module 26 is installed through the guide groove 12. The movable end of the vertical module 26 is connected to the partition plate 21. The vertical module 26 adopts the existing technology and can be in the form of an electric cylinder or a screw nut pair, which is used to drive the partition plate 21 to move up and down, so as to facilitate gas drainage. The cross-sectional area of ​​the through groove in the middle of the bottom plate 211 is larger than the cross-sectional area of ​​the transformer 5, so that the transformer 5 can pass through the through groove. When layered drying is performed, the partition plate 21 is split and the bottom plate 211 serves as a bearing base. The horizontal plate 212 and the sealing plate 213 are slidably guided by the slide groove, so that when the horizontal plate 212 and the sealing plate 213 shrink toward the slide groove, they can shrink according to the surface of the transformer 5. The vacuum pump 4 creates negative pressure on the upper side of the horizontal plate 212 through the drainage component 22. The pressure on the lower side of the horizontal plate 212 is greater than the pressure on the upper side. In the initial state, the horizontal plate 212 is located at the transformer The uppermost layer of the transformer 5 is firstly evacuated by starting the vacuum pump 4. At this time, the middle of the two horizontal plates 212 and the sealing plate 213 are in contact. After the upper end is evacuated, the horizontal plate 212 and the sealing plate 213 are driven to expand to the surroundings. A channel is generated in the middle surrounded by the horizontal plate 212 and the sealing plate 213. Under the action of the pressure difference, the airflow moves laterally along the upper surface from the circumference of the transformer 5, thereby removing impurities from the upper surface of the transformer 5. After the upper surface impurities are removed, when the middle channel surrounded by the horizontal plate 212 and the sealing plate 213 is larger than the cross section of the transformer 5, the bottom plate 211 is driven downward by the vertical module 26, so that the transformer 5 on the upper side of the horizontal plate 212 is always in a low-pressure state. Since the surface of the transformer 5 is an irregular surface, under the action of the pressure difference, the gas will flow upward from the gap between the horizontal plate 212, the sealing plate 213 and the surface of the transformer 5, providing the vertical flow efficiency of the airflow, which is convenient for the airflow impact removal of surface impurities.

[0040] Furthermore, the adjustment device 2 further includes a transverse cylinder 24 and a closed cylinder 25, the output end of the transverse cylinder 24 is tightly connected to the transverse plate 212, the output end of the closed cylinder 25 is tightly connected to the closing plate 213, the output directions of the transverse cylinder 24 and the closed cylinder 25 are perpendicular, and the cylinder bodies of the transverse cylinder 24 and the closed cylinder 25 are tightly connected to the wall surface of the slideway respectively;

[0041] During vacuum drying: the bottom plate 211 moves from top to bottom.

[0042] The transverse cylinder 24 and the closing cylinder 25 are respectively fixed in the slide groove. The transverse cylinder 24 is used to drive the transverse plate 212 to move, and the closing cylinder 25 is used to drive the closing plate 213 to move. The movement of the transverse plate 212 and the closing plate 213 is used to change the size of the middle enclosed channel, thereby guiding the gas flow direction on the upper surface and side wall of the transformer 5, impacting and removing impurities on the surface of the transformer 5, and improving the diversity of gas flow. When vacuum drying is performed, the bottom plate 211 is driven to move gradually from top to bottom through the vertical module 26 to improve the quality of layered drying.

[0043] Furthermore, the drainage assembly 22 includes a drainage tube 221, which is connected to the vacuum pump 4 pipeline. An air nozzle 222 is provided on the inner side of the transverse plate 212 and the sealing plate 213, and the end of the drainage tube 221 away from the vacuum pump 4 is connected to the air nozzle 222.

[0044] The negative pressure end of the vacuum pump 4 is connected to the drainage pipe 221, and the gas nozzle 222 is respectively placed on the horizontal plate 212 and the sealing plate 213. As the horizontal plate 212 and the sealing plate 213 move downward, the vacuum drying gas flow path is shortened to improve the drying efficiency.

[0045] Furthermore, the regulating device 2 also includes a pressure-sensitive component 23, a pressure-sensitive groove 2122 is provided on the horizontal plate 212, the pressure-sensitive groove 2122 is "L"-shaped, the pressure-sensitive component 23 includes a pressure-sensitive diaphragm 231, a fixed pole piece 232 and a moving pole piece 233, the pressure-sensitive diaphragm 231 is placed at the corner seal of the pressure-sensitive groove 2122, the pressure-sensitive diaphragm 231 extends outwardly to be provided with a moving pole piece 233, the fixed pole piece 232 and the wall of the pressure-sensitive groove 2122 are tightly connected, the moving pole piece 233 and the fixed pole piece 232 are alternately arranged, and the moving pole piece 233 and the fixed pole piece 232 are respectively electrically connected to the two wiring terminals of the power supply to form a detection circuit.

[0046] The pressure-sensitive component 23 is provided to detect the sealing of the transformer 5. When the vacuum drying reaches the end, the bottom plate 211 moves to the bottom of the drying chamber 11. At this time, the vacuum drying is completed. Under the action of the vacuum pump 4, the pressure inside the drying chamber 11 is the lowest. One end of the pressure-sensitive groove 2122 is connected to the drying chamber 11. Under the action of the pressure difference, the pressure-sensitive diaphragm 231 is an elastic sheet. When it is deformed, it moves with the moving pole piece 233 toward the fixed pole piece 232, so that the overlapping area between the fixed pole piece 232 and the moving pole piece 233 increases. As the cross-sectional area of ​​the overcurrent increases, the local resistance decreases. When the power supply outputs the rated voltage When the current value generated in the detection circuit is the largest, when the leakage detection is performed, after the minimum air pressure is reached, the vacuum pump 4 no longer evacuates air, and the transformer 5 remains stationary in the drying chamber 11 for a period of time. When the transformer 5 leaks, the fluid medium inside the transformer 5 flows out and enters the drying chamber 11, causing the pressure in the drying chamber 11 to increase, and the pressure difference on both sides of the pressure-sensitive diaphragm 231 to decrease. Under the action of its own elasticity, the moving electrode piece 233 is driven to move away from the fixed electrode piece 232. As the overlapping area decreases, the resistance increases, and the current in the detection circuit decreases, thereby detecting the leakage problem of the transformer 5.

[0047] Furthermore, the auxiliary heating device 3 includes an air duct 31 and a fan 33 . The air duct 31 is provided at the output end of the fan 33 . The outlet of the air duct 31 is located at the bottom end of the drying chamber 11 . The air duct 31 has a built-in electric heating wire 32 .

[0048] The fan 33 is used to compress the gas and send the compressed gas into the air duct 31. The air duct 31 is provided with an electric heating wire 32 for heating the compressed gas. After the heating is completed, the hot gas enters the drying chamber 11 for auxiliary heat drying of the transformer 5.

[0049] As an optimization, the fan 33 is electrically connected to the detection circuit;

[0050] During auxiliary heat drying: the bottom plate 211 moves from bottom to top. During anti-leakage detection, if the current does not change, that is, if the current does not decrease, the fan 33 is automatically turned on to perform auxiliary heat drying. When the current decreases, that is, if leakage occurs, auxiliary heat drying is not performed to ensure the safety of drying.

[0051] As an optimization, a sealing groove 2121 is provided on the transverse plate 212, and the sealing plate 213 is slidably connected to the sealing groove 2121. By providing the sealing groove 2121, the sliding of the sealing plate 213 is auxiliary guided, and the sealing plate 213 can be stored when moving in the center.

[0052] The working principle of the present invention is as follows: in the initial state, the transverse plate 212 is located at the uppermost layer of the transformer. By starting the vacuum pump 4, the upper space of the transverse plate 212 is evacuated first. At this time, the two transverse plates 212 and the sealing plate 213 are in contact with each other. After the upper end is evacuated, the transverse plate 212 and the sealing plate 213 are driven to expand to the surroundings. A channel is generated in the middle surrounded by the transverse plate 212 and the sealing plate 213. Under the action of the pressure difference, the airflow moves laterally along the upper surface from the circumference of the transformer 5, thereby removing impurities from the upper surface of the transformer 5. After the upper surface is cleaned, when the middle channel surrounded by the transverse plate 212 and the sealing plate 213 is larger than the cross section of the transformer 5, the bottom plate 211 is driven downward by the vertical module 26, so that the transformer 5 on the upper side of the transverse plate 212 is always in a low-pressure state. The surface of the transformer 5 is an irregular surface. Under the action of the pressure difference, the gas will flow upward from the gap between the horizontal plate 212, the sealing plate 213 and the surface of the transformer 5, providing vertical flow efficiency of the airflow, and facilitating the airflow impact removal of surface impurities; changing the size of the middle enclosed channel, thereby guiding the gas flow direction of the upper surface and side wall of the transformer 5, impacting and removing impurities on the surface of the transformer 5, and improving the diversity of gas flow. During vacuum drying, the bottom plate 211 is driven to move gradually from top to bottom through the vertical module 26 to improve the quality of layered drying; the negative pressure end of the vacuum pump 4 is connected to the drainage pipe 221, and the gas nozzle 222 is respectively placed on the horizontal plate 212 and the sealing plate 213. As the horizontal plate 212 and the sealing plate 213 move downward, the vacuum drying gas flow path is shortened and the drying efficiency is improved.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A leak-proof oil-immersed transformer vacuum drying device, the vacuum drying device being used to vacuum dry a transformer (5), characterized in that: The vacuum drying device comprises a vacuum box (1), a regulating device (2), an auxiliary heating device (3) and a vacuum pump (4); the vacuum pump (4) is connected to the vacuum box (1); the regulating device (2) is built into the vacuum box (1); the auxiliary heating device (3) and the vacuum box (1) are connected by a pipeline; the regulating device (2) and the vacuum pump (4) are connected by a pipeline; the transformer (5) is placed in the vacuum box (1); and the regulating device (2) is used to conduct layered flow diversion of the vacuum drying gas; The vacuum box (1) comprises a drying chamber (11), the transformer (5) is placed in the drying chamber (11), a guide groove (12) is provided on the vacuum box (1), the adjustment device (2) comprises a partition plate (21) and a vertical module (26), the vertical module (26) is placed in the guide groove (12), a movable end of the vertical module (26) is tightly connected to the partition plate (21), and the partition plate (21) is slidably connected to the drying chamber (11); The partition plate (21) comprises a bottom plate (211), a transverse plate (212) and a sealing plate (213); the bottom plate (211) is provided with a through groove in the middle; the cross-sectional area of ​​the through groove of the bottom plate (211) is larger than the cross-sectional area of ​​the transformer (5); a slide groove is provided on the bottom plate (211); the transverse plates (212) and the sealing plates (213) are symmetrically arranged in pairs; the transverse plates (212) and the sealing plates (213) arranged in groups are respectively slidably connected to the slide grooves; drainage components (22) are respectively provided on the upper sides of the transverse plates (212) and the sealing plates (213); the negative pressure end of the vacuum pump (4) passes through the wall of the vacuum box (1) and is connected to the drainage component (22) pipeline.

2. The leak-proof oil-immersed transformer vacuum drying device according to claim 1, characterized in that: The regulating device (2) further comprises a transverse cylinder (24) and a closing cylinder (25); the output end of the transverse cylinder (24) is tightly connected to the transverse plate (212); the output end of the closing cylinder (25) is tightly connected to the closing plate (213); the output directions of the transverse cylinder (24) and the closing cylinder (25) are perpendicular; and the cylinder bodies of the transverse cylinder (24) and the closing cylinder (25) are tightly connected to the wall surface of the slide groove respectively; During vacuum drying: the bottom plate (211) moves from top to bottom.

3. The leak-proof oil-immersed transformer vacuum drying device according to claim 2, characterized in that: The drainage assembly (22) comprises a drainage tube (221), the drainage tube (221) being connected to a pipeline of the vacuum pump (4), an air nozzle (222) being provided on the inner sides of the transverse plate (212) and the sealing plate (213), and an end of the drainage tube (221) away from the vacuum pump (4) being connected to the air nozzle (222).

4. The leak-proof oil-immersed transformer vacuum drying device according to claim 3, characterized in that: The regulating device (2) further comprises a pressure-sensitive component (23), wherein a pressure-sensitive groove (2122) is provided on the horizontal plate (212), wherein the pressure-sensitive groove (2122) is arranged in an "L" shape, wherein the pressure-sensitive component (23) comprises a pressure-sensitive diaphragm (231), a fixed pole piece (232) and a moving pole piece (233), wherein the pressure-sensitive diaphragm (231) is disposed at the corner seal of the pressure-sensitive groove (2122), wherein the pressure-sensitive diaphragm (231) is provided with a moving pole piece (233) extending outwardly, wherein the fixed pole piece (232) is tightly connected to the wall surface of the pressure-sensitive groove (2122), wherein the moving pole piece (233) and the fixed pole piece (232) are arranged in an alternating manner, and wherein the moving pole piece (233) and the fixed pole piece (232) are respectively electrically connected to two wiring terminals of a power supply to form a detection circuit.

5. The leak-proof oil-immersed transformer vacuum drying device according to claim 4, characterized in that: The auxiliary heating device (3) comprises an air duct (31) and a fan (33); the output end of the fan (33) is provided with the air duct (31); the outlet of the air duct (31) is disposed at the bottom end of the drying chamber (11); and the air duct (31) has a built-in electric heating wire (32).

6. The leak-proof oil-immersed transformer vacuum drying device according to claim 5, characterized in that: The fan (33) is electrically connected to the detection circuit; During auxiliary heat drying: the bottom plate (211) moves from bottom to top.

7. The leak-proof oil-immersed transformer vacuum drying device according to claim 6, characterized in that: The transverse plate (212) is provided with a sealing groove (2121), and the sealing plate (213) and the sealing groove (2121) are slidably connected.

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