A low-loss three-phase combined transformer

Abstract

The present invention relates to the field of transformer technology, specifically a low-loss three-phase combined transformer, comprising a sealed shell and an iron core and windings located in the sealed shell, a disk group corresponding to the windings being fixedly mounted on the iron core, the disk group comprising an upper disk and a lower disk distributed in parallel, a movable cylinder being rotatably arranged between the upper disk and the lower disk, the inner wall of the movable cylinder being provided with a spiral downward convex strip, the convex strip and the inner wall of the movable cylinder being combined to form a spiral flow channel opening toward the windings. The low-loss three-phase combined transformer provided by the invention, when the working intensity of the secondary coil located below is high, the sealing plate moves on the convex strip to seal the portion of the spiral flow channel facing the upper secondary coil, so that the oil flowing through this portion of the flow channel has less contact with the secondary coil and can move to the spiral flow channel facing the lower secondary coil at a lower temperature, thereby improving the ability to remove heat from the lower secondary coil.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a low-loss three-phase combined transformer. Background Art

[0002] A three-phase transformer is a type of electrical equipment whose primary function is to transform voltage. It falls under the category of power transmission and transformation equipment. Its main features are an iron core surrounded by an insulated magnetic coil. When alternating current passes through it, it generates an alternating magnetizing current in the core.

[0003] According to the publication (announcement) number CN104465053B, the publication (announcement) date is 2016-08-03, which discloses a large-capacity three-phase combined phase-shifting transformer, including three single-phase transformers, which are respectively used as the A, B, and C phases to form a three-phase transformer. Each single-phase transformer includes a series transformer and an excitation transformer, which are placed in the same oil tank and are divided into two independent body parts. Each phase series transformer includes a series coil and an excitation coil, wherein the head end and the end end of the series coil serve as the power supply side input terminal and the load side output terminal respectively, and the excitation line The head and end of the coil are both led out of the oil tank. When the three phases are running together, the head and end of the three-phase series coils are connected in a triangle, and the head and end of the three-phase excitation coils are connected in a triangle; the excitation transformer includes a voltage-regulating excitation coil and a voltage-regulating coil. The head end of the voltage-regulating excitation coil is connected to the center tap of the series coil in the series transformer with the same phase, and the end is led out of the oil tank as the neutral point. The head end of the voltage-regulating coil is led out of the oil tank and connected to the triangle node of the other two-phase excitation coils, and the end is led out of the oil tank as the neutral point. When the three phases are running together, the three-phase voltage-regulating excitation coils are connected in a star shape, and the three-phase voltage-regulating coils are connected in a star shape. The three-phase combined phase-shifting transformer places phases A, B, and C in three separate oil tanks, reducing the size and weight of a single transformer and facilitating transportation and installation. This makes it suitable for applications with higher voltage levels and larger capacities. The head of the voltage-regulating excitation coil and the center tap of the in-phase series coil are connected within the same oil tank, eliminating the need for special connection structures or extraction from the oil tank. This greatly simplifies the structure and reduces technical complexity. Each line terminal is extracted through a bushing, and flexible connections between the three phases can be achieved using cables and other materials. This simplifies on-site installation, testing, and maintenance.

[0004] In the prior art including the above-mentioned patents, among the transformers in the power system, three-phase transformers usually adopt a fully sealed structure, with transformer oil used for internal insulation, and the transformer oil surrounds the windings to cool the windings during operation, thereby reducing the loss of power transmission. However, due to the lack of oil circuit guidance, the fluidity of the oil surrounding the windings is not high, resulting in only the transformer oil temperature around the windings rising, and the oil in the entire system does not exert its due heat dissipation capacity. Summary of the Invention

[0005] The purpose of the present invention is to provide a low-loss three-phase combined transformer to solve the above problems.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a low-loss three-phase combined transformer, comprising a sealed shell and an iron core and a winding located in the sealed shell, wherein a disk group corresponding to each winding is fixedly mounted on the iron core, and the disk group comprises an upper disk and a lower disk distributed in parallel, and a movable cylinder is rotatably arranged between the upper disk and the lower disk, and a spiral downward convex strip is provided on the inner wall of the movable cylinder, and the convex strip is combined with the inner wall of the movable cylinder to form a spiral flow channel with an opening toward the winding, and a sealing plate for sealing the upper part of the spiral flow channel is slidably provided on the convex strip, and the sealing plate moves so that the amount of contact between the transformer oil in the spiral flow channel and the secondary coil located above in the winding is adjustable.

[0007] Preferably, a shift rod for driving the closing plate to move and an expansion body for driving the shift rod to move are provided in the upper plate.

[0008] Preferably, a plurality of notches located on the same vertical line are movably opened on the convex strip, and a movable block is slidably arranged in the notch, and the sealing plate moves to move the movable block.

[0009] Preferably, the sealing plate is provided with a triangular top plate for pushing the movable block, and the top plate is provided with a notch for the flow of transformer oil.

[0010] Preferably, a mounting cylinder is rotatably provided inside the movable cylinder, and a first cleaning block and a second cleaning block extending into the spiral flow channel are provided on the mounting cylinder.

[0011] Preferably, a torsion spring is provided between the movable cylinder and the mounting cylinder, and a spring leaf extending into the lower plate is provided at the bottom of the mounting cylinder.

[0012] Preferably, a movable piece is rotatably provided on the second cleaning block, and a magnet for attracting the movable piece to move is provided on the sealing plate.

[0013] Preferably, the movable cylinder is provided with air ducts distributed in a circular array, and the upper plate and the lower plate are provided with air ducts extending to the outside of the sealed shell and communicating with the air ducts.

[0014] Preferably, heat dissipation fins and scrapers for cleaning the heat dissipation fins are provided inside the air duct, and the movable cylinder rotates to move the scrapers when their corresponding air ducts face the air guide pipes.

[0015] Preferably, the upper plate and the lower plate are both provided with guide grooves for guiding the movement of the scraper, and the scraper is provided with a tenon extending into the guide groove.

[0016] In the above technical solution, the present invention provides a low-loss three-phase combined transformer, which has the following beneficial effects: when working, the oil pump delivers the transformer oil to the upper plate through the oil pipe, and a small part of the oil flows downward through the gap between the movable cylinder and the secondary coil to cool the secondary coil, and most of the oil flows rapidly downward along the spiral flow channel formed by the convex strips, and the spiral flow channel is in an open state, which can carry the oil between the movable cylinder and the secondary coil to flow rapidly downward, thereby improving the flow and change speed of the oil around the secondary coil, giving full play to the cooling capacity of the oil, and ensuring that the winding works at a suitable temperature; generally, three There are two sets of secondary coils on each winding of the phase transformer. The two sets of secondary coils output electrical energy to drive the load, but the electrical energy required for the loads driven by the two sets of secondary coils is not the same. The load that requires more electrical energy will force the corresponding secondary coil to work harder, causing the secondary coil to heat up. When the working intensity of the secondary coil located below is higher, the sealing plate moves on the convex strip to seal the part of the spiral flow channel facing the upper secondary coil, so that the oil flowing through this part of the flow channel has less contact with the secondary coil, and can move to the spiral flow channel facing the lower secondary coil at a lower temperature, thereby improving the ability to take away the heat of the lower secondary coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the internal structure provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the internal structure of a movable cylinder provided in an embodiment of the present invention;

[0021] Figure 4 A schematic structural diagram of a sealing plate provided in an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0023] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0024] Figure 7 A schematic structural diagram of a lever provided in an embodiment of the present invention;

[0025] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0026] Figure 9 for Figure 7 Enlarged view of point D in the middle;

[0027] Figure 10 A schematic structural diagram of a mounting tube provided in an embodiment of the present invention;

[0028] Figure 11 for Figure 10 Enlarged view of point E in the middle;

[0029] Figure 12 A schematic diagram of the structure of an active block provided in an embodiment of the present invention;

[0030] Figure 13 A schematic diagram of a portion of the structure of a sealing plate provided in an embodiment of the present invention;

[0031] Figure 14 A schematic structural diagram of a reed according to an embodiment of the present invention;

[0032] Figure 15 A schematic structural diagram of a movable sheet provided in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Sealing shell; 11. Movable cylinder; 111. Raised strip; 112. Closing plate; 113. Blade; 114. Drag ring; 116. Movable block; 117. Air duct; 118. Heat dissipation fin; 12. Upper plate; 121. Storage chamber; 122. Heat-conducting rod; 123. Expansion body; 124. Drag rod; 125. Air duct; 126. Top plate; 127. Oil pipeline; 128. Piston; 13. Lower plate; 131. Mounting cylinder; 132. First cleaning block; 133. Reed; 134. Scraper; 135. Guide groove; 136. Tenon; 137. Second cleaning block; 138. Movable plate. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1-15As shown, a low-loss three-phase combined transformer includes a sealed shell 1 and an iron core and a winding located in the sealed shell 1. A disk group corresponding to the winding is fixedly mounted on the iron core. The disk group includes an upper disk 12 and a lower disk 13 distributed in parallel. A movable cylinder 11 is rotatably arranged between the upper disk 12 and the lower disk 13. A spiral downward convex strip 111 is provided on the inner wall of the movable cylinder 11. The convex strip 111 and the inner wall of the movable cylinder 11 are combined to form a spiral flow channel with an opening facing the winding. A sealing plate 112 for sealing the upper part of the spiral flow channel is slidably provided on the convex strip 111. The sealing plate 112 moves to adjust the amount of contact between the transformer oil in the spiral flow channel and the secondary coil located above in the winding.

[0037] Specifically, an oil pump is provided on the outside of the sealing shell 1, and an oil pipe 127 for supplying oil to the upper plate 12 is provided in the sealing shell 1, and the output direction of the oil pipe 127 is tangent to the movable cylinder 11. There is a gap between the movable cylinder 11 and the secondary coil, and a notch for oil flow out is provided on the lower plate 13. The sealing plate 112 is spiral-shaped, and blades 113 distributed in a circular array are provided on the movable cylinder 11. A rotation damper is provided between the movable cylinder 11 and the lower plate 13.

[0038] In the above technical solution, when working, the oil pump delivers the transformer oil to the upper plate 12 through the oil pipe 127, and a small part of the oil flows downward through the gap between the movable cylinder 11 and the secondary coil to cool the secondary coil, and most of the oil flows rapidly downward along the spiral flow channel formed by the ridges 111, and the spiral flow channel is in an open state, which can carry the oil between the movable cylinder 11 and the secondary coil to flow rapidly downward, thereby increasing the flow and change speed of the oil around the secondary coil, giving full play to the cooling capacity of the oil, and ensuring that the winding works at a suitable temperature; generally, each winding of the three-phase transformer has There are two sets of secondary coils, and the two sets of secondary coils output electrical energy to drive the load. However, the electrical energy required for the loads driven by the two sets of secondary coils is not the same. The load that requires more electrical energy will force the corresponding secondary coil to work harder, causing the secondary coil to heat up. When the working intensity of the secondary coil located below is greater, the sealing plate 112 moves on the convex strip 111 to seal the part of the spiral flow channel facing the upper secondary coil, so that the oil flowing through this part of the flow channel has less contact with the secondary coil, and can move to the spiral flow channel facing the lower secondary coil at a lower temperature, thereby improving the ability to take away heat from the lower secondary coil.

[0039] As a further embodiment provided by the present invention, a lever 124 for driving the closing plate 112 to move and an expansion body 123 for driving the lever 124 to move are provided in the upper plate 12 .

[0040] Specifically, a storage cavity 121 for storing an expansion body 123 is opened in the upper plate 12, and a heat-conducting rod 122 is provided in the storage cavity 121, which extends to the bottom of the upper plate 12 and is close to the secondary coil located above. A piston 128 extending into the storage cavity 121 is provided on the shift rod 124, and a protruding shift ring 114 is provided on the sealing plate 112. The heat-conducting rod 122 is specifically made of alumina ceramics, and the expansion body 123 is specifically made of a gas with a high thermal expansion coefficient (such as hydrogen, nitrogen, and oxygen).

[0041] Furthermore, when the working intensity and temperature of the secondary coil located above are higher, the temperature of the secondary coil is transferred to the expansion body 123 through the heat-conducting rod 122. The expansion body 123 expands due to the heat and pushes the piston 128 to move. The piston 128 drives the lever 124 to move downward. The lever 124 is separated from the lever ring 114. The sealing plate 112 moves downward under the action of gravity, opening the spiral flow channel facing the secondary coil above. The oil flows along the spiral flow channel and drives the oil near the secondary coil to flow, thereby accelerating the heat exchange of the secondary coil, reducing the temperature of the secondary coil, and ensuring that the secondary coil is at a suitable temperature. When the working intensity and temperature of the secondary coil above decreases, the temperature of the expansion body 123 flows back to the secondary coil through the heat-conducting rod 122, and the expansion body 123 contracts. Negative pressure is generated in the storage chamber 121, and the piston 128 is attracted to drive the lever 124 to move upward. The lever 124 pushes the sealing plate 112 upward through the shift ring 114, and seals the part of the spiral flow channel facing the secondary coil above, so that the oil flowing through this part of the flow channel has less contact with the secondary coil, and can move to the spiral flow channel facing the secondary coil below at a lower temperature, thereby improving the ability to take away heat from the secondary coil below.

[0042] As another embodiment further provided by the present invention, a plurality of notches located on the same vertical line are movably opened on the ridge 111 , and a movable block 116 is slidably provided in the notch. The sealing plate 112 moves to move the movable block 116 .

[0043] Specifically, a spring is provided between the movable block 116 and the movable cylinder 11 .

[0044] Furthermore, when the sealing plate 112 moves to seal the spiral flow channel facing the secondary coil above, the movable block 116 on the convex strip 111 moves with the sealing plate 112 and shrinks into the movable cylinder 11. At this time, the gap on the convex strip 111 opens to form a vertical downward flow channel. The oil entering the upper half of the spiral flow channel can flow quickly to the bottom along the vertical flow channel, ensuring the heat dissipation capacity of the oil flowing into the lower half of the spiral flow channel, thereby better taking away the heat from the secondary coil below.

[0045] As another embodiment further provided by the present invention, a triangular top plate 126 for resisting the movable block 116 is provided on the sealing plate 112 , and a notch is provided on the top plate 126 for the flow of transformer oil.

[0046] Specifically, in the process of the sealing plate 112 moving upward, the slope of the top plate 126 on the sealing plate 112 abuts against the side edge of the movable block 116, and pushes the movable block 116 to retract into the movable cylinder 11, so that the gap on the ridge 111 opens, forming a vertical downward flow channel, and the upper part of the top plate 126 moves to the spiral flow channel. Although there is a gap on the top plate 126 to allow oil to flow through, it will still hinder the oil and reduce the flow speed of the oil, so that more oil enters the vertical flow channel and falls along the vertical flow channel to the lower half of the spiral flow channel, thereby cooling the secondary coil below.

[0047] As another embodiment further provided by the present invention, a mounting cylinder 131 is rotatably provided inside the movable cylinder 11 , and a first cleaning block 132 and a second cleaning block 137 extending into the spiral flow channel are provided on the mounting cylinder 131 .

[0048] Specifically, the first cleaning block 132 and the second cleaning block 137 are both slidably mounted on the mounting cylinder 131 , and the first cleaning block 132 and the second cleaning block 137 are both fitted to the corners where the protruding strip 111 and the movable cylinder 11 are connected.

[0049] Furthermore, during the operation and maintenance process, a small amount of dust will enter the oil, and the sludge formed by the mixture of dust and oil will easily accumulate at the corner where the convex strip 111 and the movable cylinder 11 are connected, thereby reducing the flow path of the spiral flow channel; during the operation of the movable cylinder 11, the mounting cylinder 131 rotates relative to the movable cylinder 11, and the movable cylinder 11 pushes the first cleaning block 132 and the second cleaning block 137 to move along the upper and lower parts of the spiral flow channel respectively, and removes the sludge attached to the corner where the convex strip 111 and the movable cylinder 11 are connected, thereby ensuring smooth flow of the oil.

[0050] As another embodiment further provided by the present invention, a torsion spring is provided between the movable cylinder 11 and the mounting cylinder 131 , and a spring leaf 133 extending into the lower plate 13 is provided at the bottom of the mounting cylinder 131 .

[0051] Specifically, a groove adapted to the spring 133 is opened on the lower plate 13. The spring 133 is specifically arc-shaped and can provide a large locking force for the installation cylinder 131 during forward rotation and a small locking force for the installation cylinder 131 during reverse rotation.

[0052] Furthermore, during the rotation of the movable cylinder 11, the spring 133 on the mounting cylinder 131 is embedded in the lower plate 13 and is locked, and the mounting cylinder 131 rotates relative to the movable cylinder 11, and the first cleaning block 132 and the second cleaning block 137 move along the spiral flow channel to remove the oil sludge attached to the corner where the convex strip 111 and the movable cylinder 11 are connected, ensuring smooth flow of oil. The movable cylinder 11 continues to rotate, and the force applied to the spring 133 increases, the spring 133 deforms, and the mounting cylinder 131 is unlocked and rotates with the movable cylinder 11; when performing maintenance or low power consumption, the working intensity of the transformer is reduced, and the oil output by the oil pump is insufficient to drive the movable cylinder 11 to rotate. At this time, the torsion spring releases the accumulated elastic potential energy, driving the mounting cylinder 131 to rotate in the opposite direction, and the first cleaning block 132 and the second cleaning block 137 on the mounting cylinder 131 move in the opposite direction along the spiral flow channel to return to the initial position, and the spring 133 can be deformed under the action of a smaller force when passing through the groove on the lower plate 13, and will not hinder the reverse rotation of the mounting cylinder 131.

[0053] As another embodiment further provided by the present invention, a movable piece 138 is rotatably provided on the second cleaning block 137 , and a magnet for attracting the movable piece 138 to move is provided on the sealing plate 112 .

[0054] Specifically, a torsion spring is provided between the movable piece 138 and the second cleaning block 137 .

[0055] Furthermore, in the process of the sealing plate 112 moving upward relative to the movable cylinder 11, the strip magnets on the sealing plate 112 are gradually offset from the protruding strips 111, and some magnets are facing the movable sheet 138. The movable sheet 138 rotates relative to the second cleaning block 137 under the action of the magnet. The movable sheet 138 seals most of the spiral flow channel, which can block the oil in the spiral flow channel, allowing more oil to flow along the vertical flow channel, and the movable sheet 138 can increase the space occupied by the second cleaning block 137 in the spiral flow channel, making it easier for it to move with the mounting cylinder 131 to clean the spiral flow channel.

[0056] As another embodiment further provided by the present invention, the movable cylinder 11 is provided with air ducts 117 distributed in a circular array, and the upper plate 12 and the lower plate 13 are provided with air guide pipes 125 extending to the outside of the sealed shell 1 and communicating with the air ducts 117.

[0057] Specifically, during operation, the air in the transformer can pass through the sealed shell 1 through the air duct 125 and the air duct 117, and take away part of the heat in the sealed shell 1, thereby improving the heat dissipation capacity inside the sealed shell 1 and ensuring that the three windings operate at a suitable temperature.

[0058] As another embodiment further provided by the present invention, heat dissipation fins 118 and scrapers 134 for cleaning the heat dissipation fins 118 are provided inside the air duct 117 , and the movable cylinder 11 rotates to move the scraper 134 when its corresponding air duct 117 faces the air guide pipe 125 .

[0059] Specifically, during operation, the cold air in the transformer can pass through the sealed shell 1 through the air duct 125 and the air duct 117, and take away part of the heat in the sealed shell 1, thereby improving the heat dissipation capacity inside the sealed shell 1 and ensuring that the three windings operate at a suitable temperature. The heat dissipation fins 118 can also increase the area of ​​heat conduction, thereby improving the heat dissipation efficiency. The movable cylinder 11 rotates so that the multiple air ducts 117 face the air duct 125 in turn. When one of the air ducts 117 faces the air duct 125, the scraper 134 in the air duct 117 moves, and the scraper 134 scrapes off the dust attached to the heat dissipation fins 118, and the dust is discharged to the outside of the sealed shell 1 along the air duct 125 under the action of gravity.

[0060] As another embodiment further provided by the present invention, both the upper plate 12 and the lower plate 13 are provided with a guide groove 135 for guiding the movement of the scraper 134 , and the scraper 134 is provided with a tenon 136 extending into the guide groove 135 .

[0061] Specifically, the guide groove 135 includes an annular portion and an inclined portion, and an annular channel for gas flow is provided at the top and bottom of the movable cylinder 11, so that the cold air entering from above can flow downward through multiple air ducts 117. Furthermore, a blower can be added to the air guide pipe 125 to increase the wind speed and air volume entering the air guide pipe 125, and a spring is provided between the scraper 134 and the movable cylinder 11.

[0062] Furthermore, when working, the oil pump delivers the transformer oil to the upper plate 12 through the oil pipe 127, and a small part of the oil flows downward through the gap between the movable cylinder 11 and the secondary coil to cool the secondary coil. Most of the oil flows rapidly downward along the spiral flow channel formed by the convex strips 111, and the spiral flow channel is in an open state, which can carry the oil between the movable cylinder 11 and the secondary coil to flow downward rapidly, thereby increasing the flow and change speed of the oil around the secondary coil, giving full play to the cooling capacity of the oil, and ensuring that the winding works at a suitable temperature. At the same time, the cold air in the transformer can pass through the sealed shell 1 through the air guide pipe 125 and the air duct 117, and take away part of the heat in the sealed shell 1, thereby improving the heat dissipation capacity inside the sealed shell 1, ensuring that the three windings work at a suitable temperature, and the heat dissipation fins 118 can also increase the area of ​​heat conduction, thereby improving the heat dissipation efficiency.

[0063] When the working intensity and temperature of the secondary coil located above decreases, the temperature of the expansion body 123 flows back to the secondary coil through the heat-conducting rod 122, the expansion body 123 contracts, and negative pressure is generated in the storage chamber 121, which attracts the piston 128 to drive the lever 124 to move upward, and the lever 124 pushes the sealing plate 112 upward through the ring 114, sealing the part of the spiral flow channel facing the secondary coil above, and the slope of the top plate 126 on the sealing plate 112 abuts against the side edge of the movable block 116, and pushes the movable block 116 to retract into the movable cylinder 11, so that the notch on the ridge 111 opens, forming a vertical downward flow channel, and the upper part of the top plate 126 moves into the spiral flow channel, and although there is a notch on the top plate 126 to allow the oil to flow However, it will still hinder the oil and reduce the speed of oil flow, so that more oil can enter the vertical flow channel and fall along the vertical flow channel to the lower half of the spiral flow channel, thereby cooling the secondary coil below. The strip magnets on the sealing plate 112 are gradually staggered with the convex strips 111, and some magnets are facing the movable sheet 138. The movable sheet 138 rotates relative to the second cleaning block 137 under the action of the magnet. The movable sheet 138 seals most of the spiral flow channel, which can block the oil in the spiral flow channel, so that more oil can flow along the vertical flow channel, so that the oil flowing through this part of the flow channel has less contact with the secondary coil, and can move to the spiral flow channel facing the secondary coil below at a lower temperature, thereby improving the ability to take away the heat of the secondary coil below.

[0064] As the movable cylinder 11 moves with the scraper 134, the tenon 136 on the scraper 134 moves along the ring portion of the guide groove 135. When one of the air ducts 117 faces the air guide pipe 125, the tenon 136 on the scraper 134 in the air duct 117 moves along the inclined portion of the guide groove 135. The two scrapers 134 gradually move toward the middle of the air duct 117, scraping off the dust attached to the heat dissipating fins 118. The dust is discharged to the outside of the sealed shell 1 along the air guide pipe 125 under the action of gravity. After the tenon 136 separates from the guide groove 135, the tenon 136 is reset under the action of the spring.

[0065] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A low-loss three-phase combined transformer, comprising a sealed shell and an iron core and a winding located in the sealed shell, characterized in that: A disk group corresponding to the winding is fixedly mounted on the iron core, the disk group includes an upper disk and a lower disk distributed in parallel, a movable cylinder is rotatably arranged between the upper disk and the lower disk, the inner wall of the movable cylinder is provided with a spiral downward convex strip, the convex strip and the inner wall of the movable cylinder are combined to form a spiral flow channel opening toward the winding, a sealing plate for sealing the upper part of the spiral flow channel is slidably provided on the convex strip, and the sealing plate moves so that the amount of contact between the transformer oil in the spiral flow channel and the secondary coil located above the winding is adjustable; The upper plate is provided with a lever for driving the closing plate to move and an expansion body for driving the lever to move; The convex strip is provided with a plurality of notches on the same vertical line, wherein a movable block is slidably arranged in the notch, and the sealing plate moves to move the movable block; The sealing plate is provided with a triangular top plate for pushing the movable block, and the top plate is provided with a notch for the flow of transformer oil.

2. A low-loss three-phase combined transformer according to claim 1, characterized in that: A mounting cylinder is rotatably provided inside the movable cylinder, and a first cleaning block and a second cleaning block extending into the spiral flow channel are provided on the mounting cylinder.

3. A low-loss three-phase combined transformer according to claim 2, characterized in that: A torsion spring is provided between the movable cylinder and the installation cylinder, and a spring leaf extending into the lower plate is provided at the bottom of the installation cylinder.

4. A low-loss three-phase combined transformer according to claim 2, characterized in that: A movable piece is rotatably provided on the second cleaning block, and a magnet for attracting the movable piece to move is provided on the sealing plate.

5. The low-loss three-phase combined transformer according to claim 1, characterized in that: The movable cylinder is provided with air ducts distributed in a circumferential array, and the upper plate and the lower plate are provided with air guide pipes extending to the outside of the sealed shell and communicating with the air ducts.

6. A low-loss three-phase combined transformer according to claim 5, characterized in that: The air duct is provided with heat dissipation fins and a scraper for cleaning the heat dissipation fins. The movable cylinder rotates to make the scraper move when its corresponding air duct faces the air guide pipe.

7. A low-loss three-phase combined transformer according to claim 6, characterized in that: The upper plate and the lower plate are both provided with guide grooves for guiding the movement of the scraper, and the scraper is provided with a tenon block extending into the guide groove.

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