Vacuum pouring dry-changing mold for transformer

Abstract

The invention discloses a vacuum pouring dry-change mold for a transformer, and relates to the technical field of vacuum pouring molds. The device comprises a shell, the shell is fixedly connected with supporting legs, the surface of a deformation assembly is fixedly connected with the inner side face of the shell, one side of the deformation assembly is fixedly connected with the outer side face of a pouring mold, the surface of a demolding assembly is slidably connected with the inner side face of the pouring mold, and the surface of the demolding assembly is fixedly connected with the inner side face of the shell. The surface of the vacuum assembly is fixedly connected with the inner side face of the demolding assembly, the vacuum assembly pumps air in the pouring mold into the interval between the shell and the pouring mold, the volume of the pouring mold is shrunk before and after demolding, and then a transformer iron core and a coil after pouring are taken out conveniently. And the integrated pouring mold can be smoothly demolded, and the outer mold, the decomposition plate, the clamp and the like do not need to be disassembled.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum casting moulds, and in particular to a transformer vacuum casting dry-type transformer mould. Background Art

[0002] Resin-insulated dry-type transformers are gaining more and more market share because of their safety, fireproof, pollution-free, can be directly installed at the load center, are maintenance-free and easy to install. However, the increase in market share has also correspondingly increased the output of transformer manufacturers; The traditional resin insulated dry-type transformer casting mold consists of an outer mold, a decomposition plate, a clamp, etc. There are too many structures that need to be disassembled during demoulding, and the demoulding cannot be completed quickly, which can easily cause over-curing of the epoxy resin and adhesion of the epoxy resin to the mold. Stress concentration is easily generated during demoulding, thereby causing defects such as cracks and deformation of the product. Before curing, the epoxy resin needs to maintain a certain temperature. When the epoxy resin is injected into the mold, temperature loss will inevitably occur, affecting the curing temperature. Therefore, we proposed a transformer vacuum casting dry transformer mold. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a transformer vacuum casting dry-type transformer mold, comprising: A bottom plate, and a supporting leg arranged on the top of the bottom plate, wherein a plurality of the supporting legs are arranged along the circumference of the bottom plate; A mold mechanism, the mold mechanism having a vacuum structure, used for pressing epoxy resin into the gap between the coil and the iron core; The top of the bottom plate is fixedly connected to the bottom of the supporting leg, the side of the supporting leg away from the bottom plate is fixedly connected to the outer side of the mold mechanism, and the mold mechanism is arranged just above the bottom plate; Wherein, the mold mechanism comprises: A housing, and a front cover and a rear cover arranged at both ends of the housing, wherein the rear cover is arranged on a side of the housing close to the bottom plate, and the front cover is arranged on a side of the housing far from the bottom plate; A casting mold, which is arranged at the interval between the front cover and the rear cover and is used for casting epoxy resin on the iron core and the coil; A vacuum component, wherein the vacuum component has a casting structure for passing epoxy resin; A deformation component, which has a limiting structure for demoulding after pouring; A demoulding assembly having a lifting structure for placing and removing the iron core and the coil; The outer side surface of the shell is fixedly connected to the side of the supporting leg away from the bottom plate, the surface of the deformation component is fixedly connected to the inner side surface of the shell, the side of the deformation component away from the inner side surface of the shell is fixedly connected to the outer side surface of the casting mold, the surface of the demoulding component is slidably connected to the inner side surface of the casting mold, and the surface of the demoulding component is fixedly connected to the inner side surface of the front end cover of the shell, the surface of the vacuum component is fixedly connected to the inner side surface of the demoulding component, and the side of the vacuum component away from the demoulding component extends to the gap between the shell and the casting mold, and one end of the vacuum component close to the demoulding component extends to the inside of the casting mold, which is used to draw air inside the casting mold into the gap between the shell and the casting mold. The end of the casting structure of the component close to the front end cover extends into the casting mold, and the end of the casting structure of the vacuum component away from the front end cover passes through the rear end cover and extends to the outside of the shell, which is used to pass epoxy resin from the inside of the shell into the inside of the casting mold. First, the demoulding component is started, and the demoulding component drives the front end cover and the vacuum component of the shell to rise, and the end of the casting mold away from the bottom plate leaks out, and the iron core and the coil are placed in the casting mold. Then the demoulding component drives the front end cover and the vacuum component of the shell to reset again, and the vacuum component is started. The vacuum component pumps the air inside the casting mold into the gap between the shell and the casting mold. Then, the casting structure of the vacuum component passes epoxy resin, and the epoxy resin contacts the iron core and the coil. After the casting is completed, The epoxy resin is cured. After the curing is completed, the demoulding component is started again to drive the front cover of the shell and the vacuum component to rise. Under the vacuum environment, the impurities after pouring are low, which reduces the by-products after the epoxy resin reaction. The absence of air also means that no bubbles will be generated, which can improve the quality after pouring. Under vacuum pressure, the epoxy resin can fully enter the gap between the iron core and the coil, further avoiding the generation of bubbles and voids, and improving the insulation and protection effect after molding. After the vacuum component pumps the air inside the casting mold into the gap between the shell and the casting mold, the pressure inside the casting mold drops, and the pressure at the gap between the casting mold and the shell rises, thereby causing the casting mold to deform and the internal volume of the casting mold to decrease, making the casting mold before demoulding. The volume of the post-casting mold shrinks first and then recovers, which makes it easy to demould and take out the transformer core and coil after casting, so that the integrated casting mold can also be demoulded smoothly without disassembling the outer mold, decomposition plate, clamps, etc. After the curing is completed, the pressure at the gap between the shell and the casting mold is released, the pressure drops rapidly, the volume of the casting mold is gradually restored, and the demoulding is completed quickly to avoid over-curing, avoid adhesion between the casting mold and the coil and the core, avoid stress concentration during demoulding, thereby avoiding defects such as cracks and deformation of the product, and drawing the gas inside the casting mold into the gap between the casting mold and the shell instead of discharging it into the atmosphere, which can increase the pressure difference, make the uniform shrinkage and deformation of the casting mold more thorough, and make demoulding more convenient.

[0004] Furthermore, the deformation component includes a first limit plate, which is set to a T shape and is fixedly connected to the inner side surface of the shell. Four first limit plates are evenly arranged along the circumference of the shell, and L plates are symmetrically arranged on both sides of the four first limit plates, and the L plates are fixedly connected to the outer side surface of the casting mold. The surface of the first limit plate is slidingly connected to the side where the two L plates are close to each other. The casting mold is deformed, driving the L plate to slide on the surface of the first limit plate. The T-shaped first limit plate cooperates with the L plate to limit the deformation and recovery of the casting mold, ensuring that the casting mold can shrink and recover evenly, and ensuring that the shape and size of each workpiece after casting are uniform during batch processing. The first limit plate and the symmetrical L plates are circumferentially distributed on the four sides of the casting mold, which can ensure that the four sides of the casting mold can be evenly deformed and recovered, ensuring the regularity of the shape of the workpiece after molding.

[0005] Furthermore, a first spring is provided at the interval between the two L-plates and the first limit plate, and the two first springs are symmetrically arranged, and the two ends of the first spring are respectively fixedly connected to the side where the L-plate and the first limit plate are close to each other. The first limit plate moves, driving the first spring to compress, and the first spring can buffer the first limit plate, ensuring that the first limit plate can move slowly, avoiding sudden contraction or recovery of the casting mold, avoiding fatigue of the casting mold, and ensuring that the casting mold can maintain deformation ability for a long time.

[0006] Furthermore, a second limit plate is fixedly connected to a side of the rear end cover of the shell close to the casting mold, and a support plate is slidably connected to the surface of the second limit plate. Four support plates are evenly arranged along the circumference of the second limit plate, and a side of the support plate away from the rear end cover of the shell is fixedly connected to the bottom of the outer side surface of the casting mold. When the casting mold is not contracted, the support plate supports the bottom of the casting mold. When the casting mold contracts, the support plate is driven to move, and the support plate slides on the surface of the second limit plate to limit the contraction of the bottom of the casting mold, thereby ensuring uniform contraction of the bottom of the casting mold and regularity of the bottom of the workpiece.

[0007] Furthermore, second springs are arranged at the intervals between the four support plates and the second limit plates, and the second springs are evenly distributed along the circumference of the second limit plates. Both ends of the second springs are respectively fixedly connected to the sides where the support plates and the second limit plates are close to each other. The movement of the support plates drives the second springs to be compressed, thereby further buffering the bottom of the casting mold.

[0008] Furthermore, the vacuum assembly includes an outer tube, four of which are evenly distributed at the interval between the outer shell and the casting mold, and the surfaces of the four outer tubes close to the rear end cover of the outer shell are fixedly connected to the pump air assembly, the surface of the pump air assembly is slidably connected to the inner side surface of the outer shell, the end of the outer tube away from the pump air assembly passes through the front end cover of the outer shell and extends to the interior of the casting mold, the surface of the outer tube is fixedly connected to the front end cover of the outer shell, an inner tube is arranged inside the outer tube, the end of the inner tube away from the pump air assembly extends to the interior of the casting mold, the end of the inner tube away from the front end cover of the outer shell passes through the rear end cover of the outer shell, and the surface of the inner tube is slidably connected to the rear end cover of the shell, and the inner tube is located at one end outside the outer shell. The end is used to pass epoxy resin, the surface of the inner tube is fixedly connected to the inner side of the outer tube located at one end of the outer shell and the casting mold, the pump air component is started, the pump air component draws the air inside the casting mold into the gap between the outer shell and the casting mold, when the inside of the casting mold is vacuum, the end of the inner tube located outside the outer shell is passed through the epoxy resin, the epoxy resin is cast on the iron core and the coil, and in a vacuum environment, the gap between the iron core and the coil is filled to avoid bubbles and voids between the iron core and the coil, thereby improving the insulation and protection effect after curing, and at the same time the inner tube is arranged inside the outer tube, the outer tube is also vacuum after the gas is pumped out, thereby keeping the inner tube warm, maintaining the temperature of the epoxy resin injected into the casting mold, and ensuring the curing effect.

[0009] Furthermore, the pump air assembly includes a branch pipe, which is fixedly connected to the surface of the outer pipe, and the inner cavity of the branch pipe is communicated with the inner cavity of the outer pipe, the end of the branch pipe away from the outer pipe is fixedly connected to a vacuum pump, and the end of the vacuum pump away from the branch pipe is fixedly connected to an exhaust pipe, the surface of the vacuum pump is fixedly connected to a slide seat, the surface of the slide seat is slidably connected to the inner side surface of the outer shell, and the slide seat is arranged at the four corners of the outer shell, and the vacuum pump is started, and the vacuum pump drives the gas flow inside the outer tube, and the air inside the casting mold passes through the outer tube, the branch pipe, the vacuum pump, and the exhaust pipe in turn, and finally enters the gap between the outer shell and the casting mold, so that the casting mold, the outer tube, and the branch pipe are all vacuumed.

[0010] Furthermore, the demolding assembly includes a telescopic rod, a circular groove is provided on one side of the casting mold close to the front end cover of the shell, and there are four circular grooves distributed circumferentially at the four corners of the casting mold, and one end of the telescopic rod is fixedly connected to the bottom of the inner side surface of the circular groove, and the end of the telescopic rod close to the outer tube is fixedly connected to a connecting block, and the side of the connecting block away from the telescopic rod is fixedly connected to the surface of the outer tube, and the surface of the connecting block is fixedly connected to the inner side surface of the front end cover of the shell. Before inserting the iron core and the coil, start the telescopic rod, the telescopic rod extends, and drives the connecting block, outer tube, inner tube, branch pipe, vacuum pump, exhaust pipe, and slide seat to rise, so that the top of the casting mold leaks out, and the iron core and the coil are placed in, and then the telescopic rod is reset, and the front end cover of the shell is sealed with the shell.

[0011] Furthermore, a fixed plate is provided at one end of the outer tube close to the connecting block, and the inner side surface of the fixed plate is fixedly connected to the surface of the outer tube. A sealing plate is provided on the side of the fixed plate away from the outer tube, and the inner side surface of the sealing plate is slidably connected to the surface of the inner tube. A circular hole is opened at the center of the surface of the sealing plate, and there are several circular holes, and the circular holes are evenly distributed at the center of the sealing plate. The outer tube generates suction, and the air inside the casting mold enters the gap between the fixed plate and the sealing plate through the circular holes, and finally enters the outer tube.

[0012] Furthermore, a telescopic column is provided at the interval between the fixed plate and the sealing plate, and both ends of the telescopic column are respectively fixedly connected to the side where the fixed plate and the sealing plate are close to each other, a cone block is fixedly connected to the side of the fixed plate close to the sealing plate, and the cone block is rigidly clamped with the inner side of the circular hole, and a sealing ring is fixedly connected to the surface of the cone block, and a plurality of sealing rings are evenly distributed on the surface of the cone block. When the inside of the casting mold is vacuumed, the telescopic column is started, the telescopic column contracts, the sealing plate slides on the surface of the inner tube, the sealing plate moves toward the cone block and the sealing ring, the cone block and the sealing ring are clamped into the inside of the circular hole, and the sealing ring seals the circular hole, so that the sealing plate and The top of the casting mold is completely sealed, and then the inner tube injects epoxy resin into the casting mold. After curing is completed, the pressure outside the fixed plate is released, the telescopic column is driven to recover, and the sealing plate is driven to descend. The vacuum state inside the casting mold disappears, and a sealing ring is set to fully seal the rigidly clamped cone block and the circular hole to ensure the maintenance of the vacuum environment inside the casting mold. The fixed plate always slides on the surface of the outer tube to ensure the sealing of one end of the outer tube connected to the fixed plate, thereby maintaining the vacuum state inside the outer tube, maintaining the vacuum environment outside the inner tube, ensuring the heat preservation of the inner tube, and avoiding the epoxy resin from cooling before being injected into the casting mold to ensure the curing effect.

[0013] The present invention has the beneficial effects: 1. The present invention provides a vacuum component, which can evacuate the casting mold to a vacuum state. Under the vacuum environment, the impurities after casting are low, and the by-products after the epoxy resin reaction are reduced. The absence of air also means that no bubbles will be generated, which can improve the quality after casting. Under the vacuum pressure, the epoxy resin can fully enter the gap between the iron core and the coil, further avoiding the generation of bubbles and voids, and improving the insulation and protection effects after molding. The gas inside the casting mold is drawn into the gap between the casting mold and the shell instead of being discharged into the atmosphere, which can increase the pressure difference, make the uniform shrinkage deformation of the casting mold more thorough, and make demoulding more convenient. At the same time, the inner tube is arranged inside the outer tube, and the interior of the outer tube is also vacuum after the gas is extracted, so as to insulate the inner tube, maintain the temperature of the epoxy resin injected into the casting mold, and ensure the curing effect.

[0014] 2. The present invention sets a casting mold, and the casting mold is deformed. The volume of the casting mold shrinks first and then recovers before and after demolding, so that it is convenient to demold and take out the transformer core and coil after casting, so that the integrated casting mold can also be demolded smoothly without disassembling the outer mold, decomposition plate, clamp, etc. After curing is completed, the pressure at the interval between the shell and the casting mold is released, the volume of the casting mold is gradually restored, and the demolding is completed quickly, avoiding over-curing, avoiding adhesion between the casting mold and the coil and the core, avoiding stress concentration during demolding, thereby avoiding defects such as cracks and deformation of the product.

[0015] 3. The present invention sets a deformation component to limit the deformation and recovery of the four sides and the bottom of the casting mold, ensuring that the casting mold can shrink and recover evenly, ensuring that during batch processing, the shape and size of each workpiece after casting are uniform, and maintaining the regular shape of the workpiece after molding. The first spring and the second spring can act as a buffer to avoid sudden contraction or recovery of the casting mold, avoid fatigue of the casting mold, and ensure that the casting mold can maintain its deformation ability for a long time.

[0016] 4. The present invention can fully seal the rigidly clamped cone block and the circular hole by setting a demoulding component and a sealing ring, thereby ensuring the maintenance of the vacuum environment inside the casting mold. The fixed plate always slides on the surface of the outer tube to ensure the sealing of one end of the outer tube connected to the fixed plate, thereby maintaining the vacuum state inside the outer tube and the vacuum environment outside the inner tube, ensuring the heat preservation of the inner tube, avoiding cooling of the epoxy resin before being injected into the casting mold, and ensuring the curing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a vacuum casting dry-type transformer mold of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the housing of the present invention; Figure 3 It is a schematic diagram of the structure of the deformation component of the present invention; Figure 4 This is a schematic diagram of the first spring structure of the present invention; Figure 5 It is a schematic diagram of the support plate structure of the present invention; Figure 6 This is a schematic diagram of the support plate assembly structure of the present invention; Figure 7 This is a schematic diagram of the structure of the vacuum component of the present invention; Figure 8 It is a schematic diagram of the structure of the pump gas assembly of the present invention; Fig. 9 It is a schematic diagram of the circular groove structure of the present invention; Fig.10 It is a schematic diagram of the circular hole structure of the present invention; Fig.11This is a schematic diagram of the sealing plate assembly structure of the present invention; Fig.12 It is a schematic diagram of the cross-sectional structure of the cone block of the present invention.

[0018] In the figure: 1. bottom plate; 2. supporting leg; 3. mold mechanism; 31. shell; 32. casting mold; 33. vacuum assembly; 331. outer tube; 332. pump air assembly; 3321. branch pipe; 3322. vacuum pump; 3323. exhaust pipe; 3324. slide seat; 333. inner tube; 34. deformation assembly; 341. first limit plate; 342. L plate; 343. first spring; 344. second limit plate; 345. support plate; 346. second spring; 35. demoulding assembly; 351. telescopic rod; 352. circular groove; 353. connecting block; 354. fixed plate; 355. sealing plate; 356. circular hole; 357. cone block; 358. sealing ring; 359. telescopic column. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0020] Example 1, please refer to Figure 1-Figure 6 The present invention is a transformer vacuum casting dry-type transformer mold, comprising: A bottom plate 1, and a support leg 2 arranged on the top of the bottom plate 1, wherein a plurality of support legs 2 are arranged along the circumference of the bottom plate 1; A mold mechanism 3, which has a vacuum structure and is used to press epoxy resin into the gap between the coil and the iron core; The top of the bottom plate 1 is fixedly connected to the bottom of the support leg 2, and the side of the support leg 2 away from the bottom plate 1 is fixedly connected to the outer side of the mold mechanism 3, and the mold mechanism 3 is arranged directly above the bottom plate 1; Wherein, the mold mechanism 3 comprises: A housing 31, and a front cover and a rear cover arranged at both ends of the housing 31, wherein the rear cover is arranged on a side of the housing 31 close to the bottom plate 1, and the front cover is arranged on a side of the housing 31 away from the bottom plate 1; A casting mold 32, which is arranged at the interval between the front cover and the rear cover and is used for casting epoxy resin on the iron core and the coil; A vacuum component 33, wherein the vacuum component 33 has a casting structure for passing epoxy resin; A deformation component 34, wherein the deformation component 34 has a limiting structure for demoulding after the casting is completed; A demoulding assembly 35, which has a lifting structure and is used for inserting and removing the iron core and the coil; The outer side surface of the shell 31 is fixedly connected to the side of the support leg 2 away from the base plate 1, the surface of the deformation component 34 is fixedly connected to the inner side surface of the shell 31, the side of the deformation component 34 away from the inner side surface of the shell 31 is fixedly connected to the outer side surface of the casting mold 32, the surface of the demoulding component 35 is slidably connected to the inner side surface of the casting mold 32, and the surface of the demoulding component 35 is fixedly connected to the inner side surface of the front end cover of the shell 31, the surface of the vacuum component 33 is fixedly connected to the inner side surface of the demoulding component 35, and the side of the vacuum component 33 away from the demoulding component 35 extends to the gap between the shell 31 and the casting mold 32, and the end of the vacuum component 33 close to the demoulding component 35 extends to the inside of the casting mold 32, which is used to draw air inside the casting mold 32 into the gap between the shell 31 and the casting mold The end of the casting structure of the vacuum component 33 close to the front end cover extends into the casting mold 32, and the end of the casting structure of the vacuum component 33 away from the front end cover passes through the rear end cover and extends to the outside of the shell 31, which is used to pass epoxy resin from the inside of the shell 31 into the casting mold 32. First, the demoulding component 35 is started, and the demoulding component 35 drives the front end cover of the shell 31 and the vacuum component 33 to rise, and the end of the casting mold 32 away from the bottom plate 1 leaks out, and the iron core and the coil are placed in the casting mold 32. Then the demoulding component 35 drives the front end cover of the shell 31 and the vacuum component 33 to reset again, and the vacuum component 33 is started. The vacuum component 33 pumps the air inside the casting mold 32 into the gap between the shell 31 and the casting mold 32. Then the vacuum component Epoxy resin is introduced into the casting structure 33, and the epoxy resin contacts the iron core and the coil. After the casting is completed, the epoxy resin is cured. After the curing is completed, the demoulding component 35 is started again to drive the front end cover of the shell 31 and the vacuum component 33 to rise. Under the vacuum environment, the impurities after casting are low, and the by-products after the epoxy resin reaction are reduced. The absence of air also means that no bubbles will be generated, which can improve the quality after casting. Under vacuum pressure, the epoxy resin can fully enter the gap between the iron core and the coil, further avoiding the generation of bubbles and voids, and improving the insulation and protection effect after molding. After the vacuum component 33 pumps the air inside the casting mold 32 into the gap between the shell 31 and the casting mold 32, the pressure inside the casting mold 32 drops, and the gap between the casting mold 32 and the shell 31 is The pressure rises, thereby causing the casting mold 32 to deform, and the internal volume of the casting mold 32 is reduced, so that the volume of the casting mold 32 shrinks first and then recovers before and after demolding, thereby facilitating demolding to remove the transformer core and coil after casting, so that the integrated casting mold 32 can also be demolded smoothly without disassembling the outer mold, decomposition plate, clamp, etc., and after the curing is completed, the pressure at the gap between the shell 31 and the casting mold 32 is released, the pressure is rapidly reduced, the volume of the casting mold 32 is gradually restored, and the demolding is completed quickly, avoiding over-curing, avoiding adhesion between the casting mold 32 and the coil and the core, avoiding stress concentration during demolding, thereby avoiding defects such as cracks and deformation of the product, and drawing the gas inside the casting mold 32 into the gap between the casting mold 32 and the shell 31,Instead of discharging into the atmosphere, the pressure difference can be increased, so that the uniform shrinkage and deformation of the casting mold 32 is more thorough, and demoulding is more convenient.

[0021] The deformation component 34 includes a first limit plate 341, which is set in a T shape and is fixedly connected to the inner side of the shell 31. Four first limit plates 341 are evenly arranged along the circumference of the shell 31, and L plates 342 are symmetrically arranged on both sides of the four first limit plates 341. The L plates 342 are fixedly connected to the outer side of the casting mold 32. The surface of the first limit plate 341 is slidably connected to the side where the two L plates 342 are close to each other, and the casting mold 32 is deformed, driving the L plates 342 The first limiting plate 341 slides on the surface of the first limiting plate 341, and the T-shaped first limiting plate 341 cooperates with the L plate 342 to limit the deformation and recovery of the casting mold 32, ensuring that the casting mold 32 can shrink and recover evenly, and ensuring that during batch processing, the shape and size of each workpiece after casting are uniform. The first limiting plate 341 and the symmetrical L plate 342 are distributed circumferentially on the four sides of the casting mold 32, which can ensure that the four sides of the casting mold 32 can deform and recover evenly, ensuring the regularity of the shape of the workpiece after molding.

[0022] A first spring 343 is provided at the interval between the two L plates 342 and the first limit plate 341, and the two first springs 343 are symmetrically arranged, and the two ends of the first spring 343 are respectively fixedly connected to the side of the L plate 342 and the first limit plate 341 that are close to each other. The first limit plate 341 moves, driving the first spring 343 to be compressed. The first spring 343 can buffer the first limit plate 341, ensuring that the first limit plate 341 can move slowly, avoiding sudden contraction or recovery of the casting mold 32, avoiding fatigue of the casting mold 32, and ensuring that the casting mold 32 can maintain deformation ability for a long time.

[0023] The rear end cover of the shell 31 is fixedly connected to a side close to the casting mold 32 with a second limit plate 344, and a support plate 345 is slidably connected to the surface of the second limit plate 344. Four support plates 345 are evenly arranged along the circumference of the second limit plate 344, and the side of the support plate 345 away from the rear end cover of the shell 31 is fixedly connected to the bottom of the outer side surface of the casting mold 32. When the casting mold 32 is not contracted, the support plate 345 supports the bottom of the casting mold 32. When the casting mold 32 contracts, the support plate 345 is driven to move, and the support plate 345 slides on the surface of the second limit plate 344 to limit the contraction of the bottom of the casting mold 32, thereby ensuring uniform contraction of the bottom of the casting mold 32 and ensuring the regularity of the bottom of the workpiece.

[0024] Second springs 346 are provided at the intervals between the four support plates 345 and the second limit plate 344, and the second springs 346 are evenly distributed along the circumference of the second limit plate 344. Both ends of the second springs 346 are respectively fixedly connected to the side where the support plate 345 and the second limit plate 344 are close to each other. The movement of the support plate 345 drives the second spring 346 to be compressed, thereby further buffering the bottom of the casting mold 32.

[0025] Example 2, please refer to Figure 1-Figure 8 The vacuum assembly 33 includes an outer tube 331, and four outer tubes 331 are evenly distributed at the interval between the outer shell 31 and the casting mold 32, and the surfaces of the four outer tubes 331 at one end close to the rear end cover of the outer shell 31 are fixedly connected with the pump assembly 332, and the surface of the pump assembly 332 is slidably connected to the inner side of the outer shell 31, and the end of the outer tube 331 away from the pump assembly 332 passes through the front end cover of the outer shell 31 and extends to the inside of the casting mold 32, and the surface of the outer tube 331 is fixedly connected to the front end cover of the outer shell 31, and an inner tube 333 is arranged inside the outer tube 331, and the end of the inner tube 333 away from the pump assembly 332 extends to the inside of the casting mold 32, and the end of the inner tube 333 away from the front end cover of the outer shell 31 passes through the rear end cover of the outer shell 31, and the surface of the inner tube 333 is slidably connected to the rear end cover of the outer shell 31, and the inner tube 333 is located outside the outer shell 31. One end is used to pass epoxy resin, and the surface of the inner tube 333 is fixedly connected to the inner side of the outer tube 331 located at one end of the outer shell 31 and the casting mold 32. The pump air component 332 is started, and the pump air component 332 draws the air inside the casting mold 32 into the gap between the outer shell 31 and the casting mold 32. When the inside of the casting mold 32 is vacuum, epoxy resin is passed into the end of the inner tube 333 located outside the outer shell 31, and the epoxy resin is cast on the iron core and the coil, and in a vacuum environment, the gap between the iron core and the coil is filled to avoid bubbles and voids between the iron core and the coil, thereby improving the insulation and protection effect after curing. At the same time, the inner tube 333 is arranged inside the outer tube 331. After the gas is extracted from the outer tube 331, its interior is also vacuum, thereby keeping the inner tube 333 warm, maintaining the temperature of the epoxy resin injected into the casting mold 32, and ensuring the curing effect.

[0026] The pump assembly 332 includes a branch pipe 3321, which is fixedly connected to the surface of the outer pipe 331, and the inner cavity of the branch pipe 3321 is connected to the inner cavity of the outer pipe 331, and the end of the branch pipe 3321 away from the outer pipe 331 is fixedly connected to the vacuum pump 3322, and the end of the vacuum pump 3322 away from the branch pipe 3321 is fixedly connected to the exhaust pipe 3323, and the surface of the vacuum pump 3322 is fixedly connected to the slide seat 3324, and the surface of the slide seat 3324 is connected to the outer shell. The inner side of the outer shell 31 is slidably connected, and the slide seat 3324 is set at the four corners of the outer shell 31. The vacuum pump 3322 is started, and the vacuum pump 3322 drives the gas inside the outer tube 331 to flow. The air inside the casting mold 32 passes through the outer tube 331, the branch pipe 3321, the vacuum pump 3322, and the exhaust pipe 3323 in sequence, and finally enters the gap between the outer shell 31 and the casting mold 32, so that the casting mold 32, the outer tube 331, and the branch pipe 3321 are all vacuumed.

[0027] Example 3, please refer to Figure 1-Figure 12 The demoulding assembly 35 includes a telescopic rod 351, a circular groove 352 is provided on one side of the casting mold 32 close to the front end cover of the shell 31, and four circular grooves 352 are distributed around the four corners of the casting mold 32, and one end of the telescopic rod 351 is fixedly connected to the bottom of the inner side of the circular groove 352, and the end of the telescopic rod 351 close to the outer tube 331 is fixedly connected to a connecting block 353, and the side of the connecting block 353 away from the telescopic rod 351 is fixedly connected to the surface of the outer tube 331, and the connecting block 353 is fixedly connected to the surface of the outer tube 331, and the connecting block 353 is fixedly connected to the outer tube 331. The surface of the connecting block 353 is fixedly connected to the inner side surface of the front end cover of the shell 31. Before putting the iron core and the coil in, start the telescopic rod 351, which extends to drive the connecting block 353, the outer tube 331, the inner tube 333, the branch pipe 3321, the vacuum pump 3322, the exhaust pipe 3323, and the slide seat 3324 to rise, so that the top of the casting mold 32 leaks out, and the iron core and the coil are put in. Then the telescopic rod 351 is reset, and the front end cover of the shell 31 is sealed with the shell 31.

[0028] A fixed plate 354 is provided at one end of the outer tube 331 close to the connecting block 353, and the inner side surface of the fixed plate 354 is fixedly connected to the surface of the outer tube 331. A sealing plate 355 is provided on the side of the fixed plate 354 away from the outer tube 331, and the inner side surface of the sealing plate 355 is slidably connected to the surface of the inner tube 333. A circular hole 356 is opened at the center of the surface of the sealing plate 355, and a plurality of circular holes 356 are provided, and the circular holes 356 are evenly distributed at the center of the sealing plate 355. The outer tube 331 generates suction, and the air inside the casting mold 32 enters the gap between the fixed plate 354 and the sealing plate 355 through the circular hole 356, and finally enters the outer tube 331.

[0029] A telescopic column 359 is provided at the interval between the fixed plate 354 and the sealing plate 355. The two ends of the telescopic column 359 are respectively fixedly connected to the side of the fixed plate 354 and the sealing plate 355 close to each other. A cone block 357 is fixedly connected to the side of the fixed plate 354 close to the sealing plate 355, and the cone block 357 is rigidly clamped with the inner side of the circular hole 356. A sealing ring 358 is fixedly connected to the surface of the cone block 357. There are several sealing rings 358 evenly distributed on the surface of the cone block 357. When the inside of the casting mold 32 is vacuumed, the telescopic column 359 is started, the telescopic column 359 shrinks, the sealing plate 355 slides on the surface of the inner tube 333, the sealing plate 355 moves toward the cone block 357 and the sealing ring 358, the cone block 357 and the sealing ring 358 are clamped into the inside of the circular hole 356, and the sealing ring 358 seals the circular hole 356. The sealing plate 355 is completely sealed with the top of the casting mold 32, and then the inner tube 333 injects epoxy resin into the casting mold 32. After curing is completed, the pressure outside the fixed plate 354 is released, the telescopic column 359 is driven to recover, and the sealing plate 355 is driven to descend, and the vacuum state inside the casting mold 32 disappears. A sealing ring 358 is set to fully seal the rigidly clamped cone block 357 and the circular hole 356 to ensure the maintenance of the vacuum environment inside the casting mold 32. The fixed plate 354 always slides on the surface of the outer tube 331 to ensure the sealing of one end of the outer tube 331 connected to the fixed plate 354, thereby maintaining the vacuum state inside the outer tube 331, maintaining the vacuum environment outside the inner tube 333, ensuring the insulation of the inner tube 333, avoiding the epoxy resin from cooling before being injected into the casting mold 32, and ensuring the curing effect.

[0030] When in use, before putting in the iron core and the coil, start the telescopic rod 351, the telescopic rod 351 extends, driving the connecting block 353, the outer tube 331, the inner tube 333, the branch pipe 3321, the vacuum pump 3322, the exhaust pipe 3323, and the slide seat 3324 to rise, and the inner tube 333 rises, driving the sealing plate 355, the telescopic column 359, the fixed plate 354, the cone block 357, and the sealing ring 358 to rise, so that the top of the casting mold 32 leaks out, and the iron core and the coil are put in, and then the telescopic rod 351 is reset, the front end cover of the shell 31 is sealed with the shell 31, and the vacuum pump 3322 is started, and the vacuum pump 3322 drives the outer tube 33 1, the outer tube 331 generates suction, the air inside the casting mold 32 enters the gap between the fixed plate 354 and the sealing plate 355 through the circular hole 356, and finally enters the outer tube 331. The air inside the casting mold 32 passes through the outer tube 331, the branch pipe 3321, the vacuum pump 3322, and the exhaust pipe 3323 in sequence, and finally enters the gap between the shell 31 and the casting mold 32. When the casting mold 32 is vacuumed, the telescopic column 359 is started, the telescopic column 359 is contracted, the sealing plate 355 slides on the surface of the inner tube 333, and the sealing plate 355 moves toward the cone block 357 and the sealing ring 358. The block 357 and the sealing ring 358 are inserted into the circular hole 356, and the sealing ring 358 seals the circular hole 356. At the same time, the pressure inside the casting mold 32 decreases, and the pressure at the gap between the casting mold 32 and the shell 31 increases, thereby causing the casting mold 32 to deform, and the internal volume of the casting mold 32 is reduced. The casting mold 32 is deformed, driving the L plate 342 to slide on the surface of the first limit plate 341, and the first limit plate 341 moves, driving the first spring 343 to be compressed, and the casting mold 32 is deformed, and at the same time, the support plate 345 is moved, and the support plate 345 slides on the surface of the second limit plate 344. The support plate 345 moves, with The second spring 346 is compressed, and then epoxy resin is injected into the inner tube 333. The inner tube 333 injects epoxy resin into the inside of the casting mold 32. The epoxy resin is cast on the iron core and the coil, and in a vacuum environment, the gap between the iron core and the coil is filled. After curing is completed, the telescopic rod 351 is started again, and the telescopic rod 351 is extended to make the top of the casting mold 32 leak again, and the pressure leaks at the gap between the outer shell 31 and the casting mold 32. The casting mold 32 is restored, and a gap is generated between the cured epoxy resin. External air is filled into the gap between the casting mold 32 and the epoxy resin, and the demoulding is quickly completed and then taken out.

[0031] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A transformer vacuum casting dry-type transformer mold, characterized in that: include: A bottom plate (1), and a support leg (2) arranged on the top of the bottom plate (1), wherein a plurality of the support legs (2) are arranged along the circumference of the bottom plate (1); A mold mechanism (3), the mold mechanism (3) having a vacuum structure, used for pressing epoxy resin into the gap between the coil and the iron core; The top of the bottom plate (1) is fixedly connected to the bottom of the support leg (2), the side of the support leg (2) away from the bottom plate (1) is fixedly connected to the outer side of the mold mechanism (3), and the mold mechanism (3) is arranged directly above the bottom plate (1); Wherein, the mold mechanism (3) comprises: A housing (31), and a front cover and a rear cover arranged at two ends of the housing (31), the rear cover being arranged on a side of the housing (31) close to the bottom plate (1), and the front cover being arranged on a side of the housing (31) away from the bottom plate (1); A casting mold (32), the casting mold (32) being arranged at the interval between the front end cover and the rear end cover and being used for casting epoxy resin on the iron core and the coil; A vacuum component (33), the vacuum component (33) having a casting structure for introducing epoxy resin; A deformation component (34), the deformation component (34) having a limiting structure for demoulding after casting is completed; A demoulding assembly (35), the demoulding assembly (35) having a lifting structure, and used for inserting and removing the iron core and the coil; The outer side surface of the shell (31) is fixedly connected to a side of the support leg (2) away from the base plate (1); the surface of the deformation component (34) is fixedly connected to the inner side surface of the shell (31); the side of the deformation component (34) away from the inner side surface of the shell (31) is fixedly connected to the outer side surface of the casting mold (32); the surface of the demoulding component (35) is slidably connected to the inner side surface of the casting mold (32); the surface of the demoulding component (35) is fixedly connected to the inner side surface of the front end cover of the shell (31); the surface of the vacuum component (33) is fixedly connected to the inner side surface of the demoulding component (35); and the vacuum component (33) is away from the demoulding component. One side of the mold component (35) extends to the gap between the shell (31) and the casting mold (32); one end of the vacuum component (33) close to the demoulding component (35) extends to the inside of the casting mold (32) and is used to draw air inside the casting mold (32) into the gap between the shell (31) and the casting mold (32); one end of the casting structure of the vacuum component (33) close to the front end cover extends into the inside of the casting mold (32); one end of the casting structure of the vacuum component (33) away from the front end cover passes through the rear end cover and extends to the outside of the shell (31) and is used to pass epoxy resin from the inside of the shell (31) into the inside of the casting mold (32).

2. A transformer vacuum casting dry-type transformer mold according to claim 1, characterized in that: The deformation component (34) comprises a first limit plate (341), the first limit plate (341) is arranged in a T-shape, and the first limit plate (341) is fixedly connected to the inner side surface of the outer shell (31), four first limit plates (341) are evenly arranged along the circumference of the outer shell (31), and L plates (342) are symmetrically arranged on both sides of the four first limit plates (341), and the L plates (342) are fixedly connected to the outer side surface of the casting mold (32), and the surface of the first limit plate (341) is slidably connected to the side where the two L plates (342) are close to each other.

3. A transformer vacuum casting dry-type transformer mold according to claim 2, characterized in that: A first spring (343) is provided at a distance between the two L-plates (342) and the first limiting plate (341), and the two first springs (343) are symmetrically arranged, and two ends of the first spring (343) are respectively fixedly connected to the L-plate (342) and the first limiting plate (341) on one side close to each other.

4. A transformer vacuum casting dry-type transformer mold according to claim 3, characterized in that: A second limiting plate (344) is fixedly connected to a side of the rear end cover of the housing (31) close to the casting mold (32), a support plate (345) is slidably connected to the surface of the second limiting plate (344), four support plates (345) are evenly arranged along the circumference of the second limiting plate (344), and a side of the support plate (345) away from the rear end cover of the housing (31) is fixedly connected to the bottom of the outer side surface of the casting mold (32).

5. A transformer vacuum casting dry-type transformer mold according to claim 4, characterized in that: Second springs (346) are arranged at intervals between the four support plates (345) and the second limit plate (344), and the second springs (346) are evenly distributed along the circumference of the second limit plate (344), and both ends of the second springs (346) are respectively fixedly connected to the side of the support plate (345) and the second limit plate (344) that are close to each other.

6. A transformer vacuum casting dry-type transformer mold according to claim 5, characterized in that: The vacuum assembly (33) comprises an outer tube (331), four of which are evenly distributed at the interval between the outer shell (31) and the casting mold (32), and one end surface of the four outer tubes (331) close to the rear end cover of the outer shell (31) is fixedly connected to the pump assembly (332), the surface of the pump assembly (332) is slidably connected to the inner side surface of the outer shell (31), the end of the outer tube (331) away from the pump assembly (332) penetrates the front end cover of the outer shell (31) and extends to the interior of the casting mold (32), and the surface of the outer tube (331) is slidably connected to the front end cover of the outer shell (31). The outer tube (331) is fixedly connected, an inner tube (333) is arranged inside the outer tube (331), one end of the inner tube (333) away from the pump air assembly (332) extends into the casting mold (32), one end of the inner tube (333) away from the front end cover of the outer shell (31) passes through the rear end cover of the outer shell (31), and the surface of the inner tube (333) is slidably connected to the rear end cover of the outer shell (31), one end of the inner tube (333) located outside the outer shell (31) is used for passing epoxy resin, and the surface of the inner tube (333) is fixedly connected to the inner side surface of the outer tube (331) located at one end of the outer shell (31) and the casting mold (32).

7. The transformer vacuum casting dry-type transformer mold according to claim 6, characterized in that: The pump air assembly (332) comprises a branch pipe (3321), the branch pipe (3321) being fixedly connected to the surface of the outer pipe (331), and the inner cavity of the branch pipe (3321) being communicated with the inner cavity of the outer pipe (331), one end of the branch pipe (3321) away from the outer pipe (331) being fixedly connected to a vacuum pump (3322), one end of the vacuum pump (3322) away from the branch pipe (3321) being fixedly connected to an exhaust pipe (3323), a sliding seat (3324) being fixedly connected to the surface of the vacuum pump (3322), a surface of the sliding seat (3324) being slidably connected to the inner side surface of the outer shell (31), and the sliding seat (3324) being arranged at the four corners of the outer shell (31).

8. The transformer vacuum casting dry-type transformer mold according to claim 7, characterized in that: The demoulding assembly (35) comprises a telescopic rod (351); a circular groove (352) is provided on a side of the casting mold (32) close to the front end cover of the outer shell (31); and four circular grooves (352) are distributed circumferentially at the four corners of the casting mold (32); and one end of the telescopic rod (351) is fixedly connected to the bottom of the inner side surface of the circular groove (352); an end of the telescopic rod (351) close to the outer tube (331) is fixedly connected to a connecting block (353); a side of the connecting block (353) away from the telescopic rod (351) is fixedly connected to the surface of the outer tube (331); and a surface of the connecting block (353) is fixedly connected to the inner side surface of the front end cover of the outer shell (31).

9. The transformer vacuum casting dry-type transformer mold according to claim 8, characterized in that: A fixed plate (354) is provided at one end of the outer tube (331) close to the connecting block (353); the inner side surface of the fixed plate (354) is fixedly connected to the surface of the outer tube (331); a sealing plate (355) is provided at a side of the fixed plate (354) away from the outer tube (331); the inner side surface of the sealing plate (355) is slidably connected to the surface of the inner tube (333); a circular hole (356) is opened at the center of the surface of the sealing plate (355); a plurality of circular holes (356) are provided, and the circular holes (356) are evenly distributed at the center of the sealing plate (355).

10. The transformer vacuum casting dry-type transformer mold according to claim 9, characterized in that: A telescopic column (359) is provided at the interval between the fixed plate (354) and the sealing plate (355), and both ends of the telescopic column (359) are respectively fixedly connected to the sides of the fixed plate (354) and the sealing plate (355) that are close to each other. A cone block (357) is fixedly connected to the side of the fixed plate (354) that is close to the sealing plate (355), and the cone block (357) is rigidly clamped to the inner side surface of the circular hole (356). A sealing ring (358) is fixedly connected to the surface of the cone block (357), and a plurality of sealing rings (358) are evenly distributed on the surface of the cone block (357).

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