Method for assembling amorphous alloy of current transformer

Abstract

The invention discloses a current transformer amorphous alloy assembling method, and relates to the technical field of transformer assembling. The method comprises the steps that amorphous alloy is rolled to obtain an amorphous alloy iron core; performing vacuum thermal radiation heat treatment annealing on the amorphous alloy iron core to improve the performance of the amorphous alloy iron core; and the annealed amorphous alloy iron core is assembled in an alloy steel protective shell, the end face is covered with a hard insulating plate, and the performance of the amorphous alloy iron core is reinforced and stabilized. Corresponding parameters of a temperature rise process and a heat preservation process involved in the heat treatment annealing step are set by a computer for controlling the heat treatment furnace, a backing furnace is set to be automatically completed, and the method is short in period and high in production efficiency. According to the assembly mode without a mold, the production efficiency is greatly improved, and the production cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer assembly, and in particular to an amorphous alloy assembly method for a current transformer. Background Art

[0002] The high vulnerability of amorphous alloys during stamping and forming has brought significant challenges to the lamination manufacturing process of current transformers compared to traditional silicon steel sheets. In order to overcome this problem, the amorphous alloy components of current transformers are mostly formed by dense winding of amorphous strips. After winding, heat treatment is immediately carried out to stabilize the structure and a protective shell is assembled. This series of steps is designed to fully protect the amorphous strip and ensure its stable performance without damage.

[0003] However, the current common heat treatment annealing method often leads to a decrease in the surface quality of the core due to equipment and process limitations, which significantly affects the excitation characteristics of the core. At the same time, the existing DMC shell and cast aluminum shell, as protective shells of amorphous alloys, are still insufficient in terms of protection when facing high-voltage environments, and the strength of the shell needs to be enhanced urgently. In view of this, the development of a precise heat treatment annealing technology based on intelligent control and the development of a high-strength protective shell have become key tasks that need to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a method for assembling amorphous alloy of a current transformer, which has the advantages of simple operation, high production efficiency, stable core performance, high reliability, and more significant protection effect on amorphous alloy.

[0005] To achieve the above purpose, the technical solution of the present application is: a method for assembling amorphous alloy of a current transformer, comprising three steps:

[0006] The first step is amorphous alloy rolling: a vertical rolling machine is used to automatically wind the amorphous alloy strip on a mold to obtain an amorphous alloy core;

[0007] The second step is heat treatment annealing of amorphous alloy: the rolled amorphous alloy core is placed in the furnace, and a heat radiation screen is placed to allow for uniform heat radiation under vacuum, and vacuum heating and heat preservation intelligent heat treatment is performed to improve the performance of the amorphous alloy core;

[0008] The third step is amorphous alloy assembly: assemble the annealed amorphous alloy core in an alloy steel casing and cover the end face with a layer of hard insulating plate to strengthen and stabilize the performance of the amorphous alloy core.

[0009] In one embodiment, the amorphous alloy is rolled as follows:

[0010] A special metal flattening plate is lightly pressed onto the amorphous alloy strip to flatten the end surface of the core, and the amorphous alloy strip is automatically wound on a mold to obtain an amorphous alloy core.

[0011] In one of the embodiments, the heat treatment annealing method for the amorphous alloy core is: the amorphous alloy core to be heat treated is evenly placed in layers on a heat treatment tray, a partition is added between two adjacent layers, the core bracket is pushed into the furnace, and the amorphous alloy core is placed in a heat radiation screen after entering the furnace, the furnace cover is tightened, and the furnace chamber is closed.

[0012] In one embodiment, the heat treatment annealing method for the amorphous alloy core further includes:

[0013] Turn on the power switch of the heat treatment furnace, and then turn on the vacuum pump switch and vacuum valve switch in sequence. When the vacuum degree indication on the vacuum gauge is less than -0.1MPa, turn on the temperature control setting instrument and time setting instrument in sequence, and then implement heat treatment annealing according to the parameters in the following chart:

[0014]

[0015] When the 7th insulation stage is over and the amorphous alloy core is heat treated and the temperature drops to 200℃±10℃, the core bracket is moved out of the furnace and placed on the storage rack.

[0016] In one embodiment, the temperature rise process and the temperature holding process involved in the heat treatment annealing are set by a computer controlling the heat treatment furnace with corresponding parameters.

[0017] In one embodiment, the annealed amorphous alloy core is assembled in the protective shell in the following manner:

[0018] Make alloy steel shell;

[0019] Processing of rigid insulation boards;

[0020] The annealed amorphous alloy core is installed inside the alloy steel shell, sealed and injected with glue, and then covered with a layer of hard insulation board to ensure a firm bond and protection between the core and the shell.

[0021] In one embodiment, when manufacturing the alloy steel shell, laser cutting technology and welding process are used to ensure the precise size and structural strength of the shell.

[0022] In one embodiment, when processing the rigid insulating board, a milling machine is used for cutting and edge burrs are processed to ensure the flatness and bonding quality of the board.

[0023] The present invention adopts the above technical solution, and can achieve the following technical effects:

[0024] 1. The present invention includes three steps of rolling, heat treatment annealing and amorphous alloy assembly. The heating process and the heat preservation process involved in the heat treatment annealing step are set by the computer controlling the heat treatment furnace. After the setting, the annealing furnace is automatically completed. This process cycle is short and the production efficiency is high.

[0025] 2. Use the vacuum of the heat treatment furnace for intelligent heat treatment, put in a heat radiation screen to ensure uniform heat radiation under vacuum state, prevent the surface oxidation of the amorphous alloy, ensure that the amorphous alloy is intact and will not break, with stable performance and high reliability, improve the performance and stability of the current transformer, and further ensure the accurate monitoring and safe operation of the power system.

[0026] 3. Alloy steel has excellent mechanical properties, and its tensile strength and yield strength are far superior to those of DMC shells and cast aluminum shells. Rigid insulation board material is known for its high hardness and good corrosion resistance, which can more effectively resist the erosion of the external environment and has a more significant protective effect on amorphous alloys.

[0027] 4. The assembly method of the present invention does not require a mold, which greatly improves production efficiency and saves production costs. This enables products made of alloy steel and hard insulation board to be manufactured in a shorter time, greatly shortening the construction period and providing customers with more timely services. At the same time, this also provides the possibility for rapid iteration and personalized customization of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is the internal structure diagram of the amorphous alloy core after assembly;

[0030] Figure 2 This is a top view of the amorphous alloy core after assembly;

[0031] Figure 3 It is the temperature variation curve of heat treatment;

[0032] Explanation of the serial numbers in the figure: 1. Alloy steel shell; 2. Hard insulation board; 3. Amorphous alloy strip. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] See also Figure 1-3 This embodiment provides a method for assembling amorphous alloy of a current transformer, which is characterized by comprising three steps:

[0038] The first step is amorphous alloy rolling: a vertical rolling machine is used to automatically wind the amorphous alloy strip on a mold to obtain an amorphous alloy core;

[0039] Specifically, during winding, a special metal flattening plate is used to lightly press on the amorphous alloy strip, and the end face of the core is gently flattened at any time to ensure that the end face of the core is flat. The machine must be stopped when there is a joint, and the length of the amorphous alloy strip inserted is not less than half a circle of the mold; due to the high speed of the vertical coiling machine, except for the broken strip that needs to be stopped for insertion, other automatically inserted strips can be directly wound;

[0040] The second step is heat treatment annealing of amorphous alloy: the rolled amorphous alloy core is placed in the furnace, and a heat radiation screen is placed to allow for uniform heat radiation under vacuum, and vacuum heating and heat preservation intelligent heat treatment is performed to improve the performance of the amorphous alloy core;

[0041] Specifically, place the amorphous alloy cores that need heat treatment in layers evenly on the heat treatment tray. The upper and lower layers of cores are staggered accordingly. Two layers can be placed on the top, and the cores of the second layer should span between the two cores of the first layer to ensure uniform heating. The number of cores placed in the middle two layers should be smaller because the heating temperature in the middle is relatively lower. After the cores are placed in layers, add a partition. Push the core bracket into the middle of the furnace. Push it in slowly and evenly to avoid instantaneous force causing the core to move and deform. After the amorphous alloy core is put into the furnace, put it into a heat radiation screen to ensure uniform heat radiation under vacuum. Then tighten the furnace cover and close the furnace.

[0042] Turn on the power switch of the heat treatment furnace, press the "trolley in" switch, merge the outer furnace with the inner furnace, and then turn on the vacuum pump, vacuum pump and the cooling circulation system at the furnace cover in turn; after 10 minutes, turn on the vacuum valve switch slowly, and do not open it all at once, observe the vacuum degree indication on the vacuum gauge, if it is less than -0.1MPa, the vacuum degree requirement is met; after the vacuum degree reaches the -0.1MPa requirement, turn on the temperature control setting instrument and time setting instrument in turn, and the set temperature control section, heating speed and time are detailed in the table below;

[0043]

[0044] The corresponding heating and holding time can be fine-tuned according to the number and size of amorphous alloy cores in the furnace; when the 7th holding period is over and the indicator light of the temperature control setting table goes out, the heat treatment of the core is completed, press the "trolley out" switch to push it out of the furnace; then turn on the fan switch to cool down; when the temperature drops to 200℃±10℃, move the core bracket out of the furnace and put it on the storage rack;

[0045] Finally, close the vacuum valve, turn off the vacuum pump switch, turn off the fan switch, then open the vacuum valve to deflate and then move out the core bracket. Move it out slowly and apply force evenly to avoid instantaneous force causing the core to move and deform.

[0046] The third step is amorphous alloy assembly: assemble the annealed amorphous alloy core in an alloy steel casing and cover the end face with a layer of hard insulating plate to strengthen and stabilize the performance of the amorphous alloy core.

[0047] Specifically, in the production of alloy steel shells, the size of the alloy shells must be accurately determined first, which is the basis for ensuring the smooth progress of subsequent steps. Then, the alloy steel raw materials are cut using high-precision laser cutting technology, and the cutting process requires precision to ensure the dimensional accuracy of the alloy steel shell. After the cutting is completed, the cut raw materials are welded into shape using a high-standard welding process. During the welding process, the temperature and time need to be strictly controlled to ensure the firmness and sealing of the welding parts. Preferably, the alloy steel shell can be stainless steel.

[0048] Next, in the production of the rigid insulating board, the size of the rigid insulating board must be accurately determined first, which is the key to ensuring the overall performance of the protective shell. Then, a professional milling machine is used to cut the rigid insulating board. The cutting process requires high precision and moderate speed to avoid damage to the material. After cutting, the burrs on the cut edge need to be repaired to ensure that the repaired edge is smooth and burr-free to prevent damage to the equipment during subsequent use. Preferably, the rigid insulating board can be a bakelite board.

[0049] Finally, when assembling the shell, put the amorphous alloy into the alloy steel shell, and then evenly apply glue inside the alloy steel shell to enhance the fixing effect between the amorphous alloy and the alloy steel shell. Then, cover the hard insulation board on the alloy steel shell to ensure that it fits tightly with the alloy steel shell to achieve the best protection effect.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for assembling amorphous alloy of current transformer, characterized in that: There are three steps involved: The first step is amorphous alloy rolling: a vertical rolling machine is used to automatically wind the amorphous alloy strip on a mold to obtain an amorphous alloy core; The second step is heat treatment annealing of amorphous alloy: the rolled amorphous alloy core is placed in the furnace, and a heat radiation screen is placed to allow for uniform heat radiation under vacuum, and vacuum heating and heat preservation intelligent heat treatment is performed to improve the performance of the amorphous alloy core; The third step is amorphous alloy assembly: assemble the annealed amorphous alloy core in an alloy steel casing and cover the end face with a layer of hard insulating plate to strengthen and stabilize the performance of the amorphous alloy core.

2. A method for assembling amorphous alloy of current transformer according to claim 1, characterized in that: The rolling method of amorphous alloy is: A special metal flattening plate is lightly pressed onto the amorphous alloy strip to flatten the end surface of the core, and the amorphous alloy strip is automatically wound on a tooling die to obtain an amorphous alloy core.

3. A method for assembling amorphous alloy of current transformer according to claim 1, characterized in that: The heat treatment annealing method for the amorphous alloy core is: the amorphous alloy core to be heat treated is evenly placed in layers on the heat treatment tray, a partition is added between two adjacent layers, the core bracket is pushed into the furnace, the amorphous alloy core is placed in the heat radiation screen after entering the furnace, the furnace cover is tightened, and the furnace is closed.

4. A method for assembling amorphous alloy of current transformer according to claim 3, characterized in that: The heat treatment annealing methods for amorphous alloy core also include: Turn on the power switch of the heat treatment furnace, then turn on the vacuum pump switch and vacuum valve switch in sequence. When the vacuum degree indication on the vacuum gauge is less than -0.1MPa, turn on the temperature control setting instrument in sequence. Table, time setting instrument, and then implement heat treatment annealing according to the parameters in the following chart: When the 7th insulation stage is over and the amorphous alloy core is heat treated and the temperature drops to 200℃±10℃, the core bracket is moved out of the furnace and placed on the storage rack.

5. A method for assembling amorphous alloy of current transformer according to claim 4, characterized in that: The heating process and the heat preservation process involved in the heat treatment annealing are set by the computer controlling the heat treatment furnace.

6. A method for assembling amorphous alloy of current transformer according to claim 1, characterized in that: The annealed amorphous alloy core is assembled in the protective shell in the following way: Make alloy steel shell; Processing of rigid insulation boards; The annealed amorphous alloy core is installed inside the alloy steel shell, sealed and injected with glue, and then covered with a layer of hard insulation board to ensure a firm bond and protection between the core and the shell.

7. A method for assembling amorphous alloy of current transformer according to claim 6, characterized in that: When making alloy steel shells, laser cutting technology and welding process are used to ensure the precise size and structural strength of the shells.

8. A method for assembling amorphous alloy of current transformer according to claim 6, characterized in that: When processing rigid insulation boards, a milling machine is used for cutting and edge burrs are processed to ensure the flatness and bonding quality of the boards.

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