Three-dimensional roll iron core assembly of power-saving device

Abstract

The invention relates to the technical field of transformer assemblies, and discloses a three-dimensional roll iron core assembly of a power saving device, the three-dimensional roll iron core assembly comprises an iron core assembly and a mounting shell, the iron core assembly comprises a lower support fixedly mounted at the bottom of an inner cavity of the mounting shell, and an iron core is fixedly mounted at the top end of the lower support; an upper bracket is arranged at the top ends of the three groups of iron cores so as to fix the top ends, and meanwhile, a pull rod with a hollow structure is arranged between the lower bracket and the upper bracket. The invention relates to a three-dimensional roll iron core assembly of a power-saving device, which effectively avoids the problem that lap joints are generated in the iron cores due to the arrangement of the iron cores and structures on the iron cores, so that the phenomenon that obvious high-resistance areas exist or magnetic flux density distortion is generated at the lap joints does not exist, and the three groups of iron cores are arranged in the shape of a Chinese character'pin '. Therefore, the lengths of magnetic circuits of the iron cores are completely equal, the sum of the lengths of the magnetic circuits is the shortest, meanwhile, the magnetic circuits among the three groups of iron cores are completely symmetrical, and no-load current is completely balanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer assembly, and particularly relates to a power-saving device three-dimensional wound core assembly. BACKGROUND

[0002] The core assembly is a main magnetic circuit part in the transformer, and together with the coil wound thereon forms a complete electromagnetic induction system to conduct magnetic flux efficiently, and thus the high magnetic conductivity of the core assembly can concentrate and guide the magnetic field to reduce the magnetic resistance and improve the working efficiency of the transformer. The core assembly in the existing transformer is mostly made of silicon steel sheets, but the core assembly made in this way has poor magnetic flux distribution in the internal magnetic circuit due to the existence of the lap joint, and the core assembly has obvious high resistance area and magnetic flux density distortion at the lap joint, which increases the energy loss of the transformer during operation and easily causes overheating, and the stability and reliability are poor.

[0003] Therefore, there is an urgent need for a core assembly for a transformer to solve the above-mentioned defects of the existing core assembly during actual operation. SUMMARY

[0004] The present application provides a power-saving device three-dimensional wound core assembly, which can effectively avoid the generation of lap joints in the core assembly and cause poor magnetic flux distribution in the internal magnetic circuit, obvious high resistance area or magnetic flux density distortion, to solve the problem that the existing core assembly has poor magnetic flux distribution in the internal magnetic circuit due to the existence of the lap joint, and the core assembly has obvious high resistance area and magnetic flux density distortion at the lap joint, which increases the energy loss of the transformer during operation and easily causes overheating.

[0005] To achieve the above object, the present application adopts the following technical solution: A three-dimensional wound core assembly of a power-saving device, comprising a core assembly and an installation housing. The core assembly includes a lower bracket fixedly installed at the bottom of the inner cavity of the installation housing by bolts. At the top of the lower bracket, three cores arranged in a "pin" shape structure are fixedly installed, so that the magnetic path lengths of the three cores are completely equal and the sum of the magnetic path lengths is the shortest. At the same time, the magnetic paths of the three cores are completely symmetrical, and the no-load currents are completely balanced. Moreover, for the arrangement of the "pin" shape structure of the three cores, the material consumption of the yoke part in the core can be effectively reduced. At the same time, the structural composition of the core assembly is greatly optimized, making its floor area smaller. At the top of the three cores, an upper bracket is provided to fix its top. At the same time, several groups of terminal blocks are provided on the side end face of the upper bracket, so that the core can be connected to an external current through the terminal blocks. At the same time, between the lower bracket and the upper bracket, three hollow拉杆arrays arranged in a circular array are provided; The installation housing includes an outer housing fixedly installed with a lower bracket at the bottom of the inner cavity. The outer housing has a top cover at its top to enclose the core assembly therein, and transformer oil covering the core is filled in the inner cavity of the outer housing. Thus, the core assembly can be insulated, cooled, and arc extinguished through the filled transformer oil.

[0006] Furthermore, the core is continuously and tightly wound from silicon steel strip materials without interruption, and its winding direction is the same as its magnetization direction. For the setting of the core, the problem of generating lap joints inside the core is effectively avoided, and there is no obvious high-resistance area or the phenomenon of magnetic flux density distortion at the lap joints; Moreover, on the premise of the same material, compared with the laminated core assembly, the iron loss process coefficient of this wound core assembly drops from between 1.3 and 1.5 to about 1.05. Just this item can reduce the loss of the core assembly by 10 - 20%; At the same time, the silicon steel sheets used to make the core need to be treated by vacuum nitrogen filling annealing at a high temperature (800 °C), thereby eliminating the mechanical stress inside the core and refining the magnetic domains of the silicon steel sheets, improving their ability of secondary recrystallization.

[0007] Further, the inside of the shell body is provided with three groups of inner chambers corresponding to the positions of the three groups of iron cores, and three groups of pump groups corresponding to the positions of the inner chambers are arranged on the top of the outer surface of the shell body, while the first connecting pipe is fixedly installed on the input end of the pump group and communicated with the bottom of the inner chamber, and the second connecting pipe is fixedly installed on the output end of the pump group and communicated with the top end of the pull rod, a plurality of first through holes arranged in linear array are formed on the pull rod, and then when the temperature of the transformer liquid in the inner chamber of the shell body is too high, the transformer liquid with lower temperature in the inner chamber can be extruded and delivered to the inner chamber of the shell body through the pull rod under the action of the pump group, and a certain degree of disturbance is generated on the transformer liquid with higher temperature, so that the convection effect is formed to accelerate the heat exchange between them.

[0008] Further, the flow-through hole is formed on the top of the inner chamber of the shell body and communicated with the inner chamber of the inner chamber, and the position of the flow-through hole is higher than the top end of the iron core, so that the transformer liquid in the shell body and the inner chamber can form a complete flow-through circuit with the pump group, and the transformer liquid with higher temperature in the shell body can flow back to the inner chamber through the flow-through hole for cooling treatment.

[0009] Further, the movable ring is arranged on the outer surface of the pull rod and at the corresponding position of the first through hole, the second through hole corresponding to the first through hole is formed on the movable ring, and at the initial time, the second through hole is below the first through hole, and the bottom end of the movable ring is provided with the expansion ring fixedly connected with the outer surface of the pull rod, so that when the temperature of the transformer liquid in the inner chamber of the shell body reaches a certain value, the expansion ring is forced to move upward due to thermal expansion, so that the first through hole and the second through hole are communicated with each other.

[0010] Further, the thermistor is arranged in the expansion ring and forms an electrical feedback connection with the pump group, so that when the temperature of the transformer oil in the inner chamber of the shell body reaches a certain value, the pump group can be automatically triggered to extrude and deliver the transformer oil with lower temperature in the inner chamber to the inner chamber of the shell body when the first through hole and the second through hole are communicated.

[0011] Further, the heat dissipation fins are arranged on the outer surface of the shell body and at the corresponding position of the inner chamber, so that the cooling speed of the transformer liquid in the inner chamber of the inner chamber is accelerated through the heat dissipation fins.

[0012] The beneficial effects of the present application are as follows: 1. The power saving device three-dimensional winding core assembly provided by the application effectively avoids the problem of lap joint in the core, thereby eliminating the phenomenon of obvious high resistance area or magnetic flux density distortion at the lap joint, and the magnetic path length of the three groups of cores is completely equal and the sum of the magnetic path lengths is the shortest, and the magnetic path between the three groups of cores is completely symmetrical and the no-load current is completely balanced, thereby effectively reducing the energy loss during operation.

[0013] 2. The power saving device three-dimensional winding core assembly provided by the application, when the temperature of the transformer liquid in the inner cavity of the shell is too high, the transformer liquid with lower temperature in the inner cavity chamber can be extruded and delivered to the inner cavity of the shell through the pull rod under the action of the pump group, and the transformer liquid with higher temperature in the inner cavity chamber is disturbed to a certain extent to form a convection effect to accelerate heat exchange between them, thereby improving the cooling speed of the core assembly and effectively improving the stability and reliability of the core assembly during operation. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings: Figure 1 It is a structural schematic diagram of the core assembly of the application; Figure 2 It is a front view of the core assembly of the application; Figure 3 It is a top view of the core assembly of the application; Figure 4 It is a structural schematic diagram of the installation of the core assembly of the application; Figure 5 It is a front view of the structure of the application; Figure 4 Figure 6 It is a structural schematic diagram of the installation shell of the application; Figure 7 It is an enlarged schematic diagram of A in the structure of the application. Figure 1

[0015] In the figure: 1 - lower support, 2 - upper support, 3 - core, 4 - terminal, 5 - pull rod, 6 - shell, 7 - inner cavity, 8 - end cover, 9 - pump group, 10 - first connecting pipe, 11 - second connecting pipe, 12 - flow-through hole, 13 - movable ring, 14 - expansion ring. DETAILED DESCRIPTION​​

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0017] As shown in Figure 1 , Figure 4 , a power saving device three-dimensional winding core assembly comprises a core assembly and a mounting shell, the core assembly comprises a lower support 1 fixedly installed in the bottom of the inner cavity of the mounting shell by bolts, as shown in Figure 2 , Figure 3 , the top end of the lower support 1 is fixedly installed with three groups of iron cores 3 arranged in a "pin" shape structure, so that the magnetic path lengths of the three groups of iron cores 3 are completely equal and the sum of the magnetic path lengths is the shortest, at the same time, the magnetic paths of the three groups of iron cores 3 are completely symmetrical, the no-load current is completely balanced, and for the "pin" shape structure arrangement of the three groups of iron cores 3, the material quantity of the yoke part in the iron core 3 can be effectively reduced, at the same time, the structure composition of the core assembly is greatly optimized, so that the area occupied is small, and an upper support 2 is arranged at the top end of the three groups of iron cores 3 to fix the top end, at the same time, a plurality of groups of terminal blocks 4 are arranged on the side end face of the upper support 2, so that the iron cores 3 can be connected with external current through the terminal blocks 4, and three groups of pull rods 5 with a hollow structure are arranged between the lower support 1 and the upper support 2 in a ring array arrangement. As shown in Figure 5 , Figure 6 , the mounting shell comprises an outer shell 6 for fixing the lower support 1 at the bottom of the inner cavity, the outer shell 6, and an end cover 8 is arranged at the top end of the outer shell 6 to cover the core assembly therein, and transformer oil is filled in the inner cavity of the outer shell 6 to submerge the iron cores 3, so that the transformer oil filled therein can perform insulation, heat dissipation and arc extinguishing operations on the core assembly.

[0018] In the technical solution, the iron cores 3 are continuously and tightly wound from silicon steel strip materials, and the winding direction is the same as the magnetization direction, wherein the arrangement of the iron cores 3 effectively avoids the problem of lap joint seams in the iron cores 3, and there is no obvious high resistance area or magnetic flux density distortion phenomenon at the lap joint seams; and under the premise of the same material, the iron loss process coefficient of the winding type core assembly is reduced from 1.3-1.5 to about 1.05 compared with the laminated core assembly, and only this one item can reduce the loss of the core assembly by 10-20%; Meanwhile, the silicon steel sheet for manufacturing the iron core 3 needs to be subjected to high-temperature (800 DEG C) vacuum nitrogen annealing treatment, thereby eliminating the mechanical stress inside the iron core 3 and refining the magnetic domain of the silicon steel sheet, and improving the secondary recrystallization capacity thereof.

[0019] As shown in Figure 5 , Figure 6 , in the technical solution, the inside of the outer shell 6 is provided with three groups of inner chambers 7 corresponding to the positions of the three groups of iron cores 3, and the top of the outer surface of the outer shell 6 is provided with three groups of pump groups 9 corresponding to the positions of the inner chambers 7, and meanwhile, the input end of the pump group 9 is fixedly provided with a first connecting pipe 10 connected to the bottom of the inner chamber 7, and the output end of the pump group 9 is fixedly provided with a second connecting pipe 11 connected to the top end of the pull rod 5, and the pull rod 5 is provided with a plurality of groups of first through holes arranged in a linear array, thereby when the temperature of the transformer liquid in the inner chamber 6 is too high, the transformer liquid with lower temperature in the inner chamber 7 can be extruded and delivered to the inner chamber of the outer shell 6 through the pull rod 5 under the action of the pump group 9, and a certain degree of disturbance is generated to the transformer liquid with higher temperature, so as to form a convection effect to accelerate the heat exchange therebetween.

[0020] As shown in Figure 6 , in the technical solution, the top of the inner chamber of the outer shell 6 is provided with a flow-through hole 12 connected to the inner chamber of the inner chamber 7, and the position of the flow-through hole 12 is higher than the top end of the iron core 3, thereby the transformer liquid in the outer shell 6 and the inner chamber 7 can form a complete flow-through circuit in cooperation with the pump group 9, and the transformer liquid with higher temperature in the outer shell 6 can flow back to the inner chamber 7 through the flow-through hole 12 for cooling treatment.

[0021] As shown in Figure 7 , in the technical solution, the outer surface of the pull rod 5 is provided with a movable ring 13 at the corresponding position of the first through hole, and the movable ring 13 is provided with a second through hole corresponding to the first through hole, and in the initial state, the second through hole is below the first through hole, and the bottom end of the movable ring 13 is provided with an expansion ring 14 fixedly connected to the outer surface of the pull rod 5, thereby when the temperature of the transformer liquid in the inner chamber of the outer shell 6 reaches a certain value, the expansion ring 14 is forced to move upward due to thermal expansion, so that the first through hole and the second through hole are connected to each other.

[0022] In the technical solution, the inside of the expansion ring 14 is provided with a thermistor and forms an electrical feedback connection with the pump group 9, thereby when the temperature of the transformer oil in the inner chamber of the outer shell 6 reaches a certain value, the first through hole and the second through hole are connected at the same time, and the pump group 9 can be automatically triggered to extrude and deliver the transformer oil with lower temperature in the inner chamber 7 to the inner chamber of the outer shell 6.

[0023] As shown in Figure 4As shown, in the technical solution, the heat dissipation fins are arranged on the outer surface of the outer shell 6 and located at the corresponding position of the inner chamber 7, and then the cooling speed of the transformer liquid in the inner chamber of the inner chamber 7 is accelerated through the heat dissipation fins.

[0024] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-dimensional wound core assembly of a power-saving device, comprising a core assembly and an installation housing, characterized in that: The core assembly includes a lower bracket (1) fixedly installed at the bottom of the inner cavity of the installation housing. At the top of the lower bracket (1), three cores (3) arranged in a "pin" shape structure are fixedly installed, and an upper bracket (2) is provided at the top of the three cores (3) to fix their tops. At the same time, several groups of terminal blocks (4) are provided on the side end face of the upper bracket (2). At the same time, a pull rod (5) with a hollow structure inside is provided between the lower bracket (1) and the upper bracket (2); The installation housing includes a housing body (6) fixedly installed with the lower bracket (1) at the bottom of the inner cavity. The housing body (6), and an end cover (8) is provided at the top of the housing body (6) to wrap the core assembly therein, and transformer oil submerging the core (3) is filled in the inner cavity of the housing body (6).

2. The three-dimensional wound iron core assembly of the energy-saving device according to claim 1, characterized in that, The core (3) is continuously wound from a strip of silicon steel sheet, and its winding direction is the same as its magnetization direction.

3. The three-dimensional wound iron core assembly of the energy-saving device according to claim 2, characterized in that, Three inner cavities (7) corresponding to the positions of the three cores (3) are provided inside the housing body (6), and three pump pressure groups (9) corresponding to the positions of the inner cavities (7) are provided on the top of the outer surface of the housing body (6). At the same time, a first connecting pipe (10) is fixedly installed at the input end of the pump pressure group (9) and communicated to the bottom of the inner cavity of the inner cavity (7), and a second connecting pipe (11) is fixedly installed at the output end of the pump pressure group (9) and connected to the top end of the pull rod (5). A number of first through holes arranged in a linear array are provided on the pull rod (5).

4. The three-dimensional wound iron core assembly of the energy-saving device according to claim 3, characterized in that, A circulation hole (12) communicating to the inner cavity of the inner cavity (7) is provided at the top of the inner cavity of the housing body (6), and the position height of the circulation hole (12) is higher than the top end of the core (3). Thus, the transformer liquid in the housing body (6) and the inner cavity (7) and the pump pressure group (9) can form a complete circulation loop, and the transformer liquid with a higher temperature in the housing body (6) can flow back to the inner cavity (7) through the circulation hole (12) for cooling treatment.

5. The three-dimensional wound iron core assembly of the energy-saving device according to claim 4, characterized in that, An activity ring (13) is provided on the outer surface of the pull rod (5) at the corresponding position of the first through hole thereon, and a second through hole corresponding to the first through hole is provided on the activity ring (13). At the initial time, the second through hole is located below the first through hole. The bottom end of the activity ring (13) is provided with an expansion ring (14) whose bottom is fixedly connected to the outer surface of the pull rod (5).

6. The three-dimensional wound iron core assembly of the energy-saving device according to claim 5, characterized in that, A thermistor is provided inside the expansion ring (14) and forms an electrical feedback connection with the pump pressure group (9).

7. The three-dimensional wound iron core assembly of the energy-saving device according to claim 1, characterized in that, Heat dissipation fins are provided on the outer surface of the housing body (6) at the corresponding position of the inner cavity (7).

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