A winding skeleton for magnetic compression device

Abstract

The present invention designs a winding skeleton of a magnetic compression device, including a primary winding device at the lower layer and a secondary winding device at the upper layer. Both the two winding devices adopt a circular ring structure, which is respectively formed by stacking and fixing three layers of annular discs and two layers of annular iron cores; the wire of each winding device is wound on the disc from the outside to the inside, and an insulating distance is left between the wire and the iron core after winding; each iron core and the disc are equipped with an oil gap pad, and after installation, an oil gap is formed between the disc and the iron core for transformer oil to flow in; each disc is provided with a fan-shaped boss for winding a bias winding; the primary winding device and the secondary winding device are first assembled separately through a connecting piece, and after winding separately, the two winding devices are assembled together. The present invention adopts two-stage magnetic compression devices that are wound separately and then assembled as a whole, and the winding skeletons are designed separately according to the different turns of the two-stage magnetic compression devices, which reduces the insulation pressure and installation difficulty.

Description

Technical Field

[0001] The invention relates to a winding skeleton of a magnetic compression device, which is used for a magnetic compression device of a pulse corona plasma power supply and belongs to the field of transformer design. Background Art

[0002] Magnetic compression is a technology that uses electromagnetic technology to compress a wide pulse into a narrow pulse with a higher peak value and shorter pulse time. The magnetic compression device mainly uses the sharp change of magnetic permeability from the linear region to the saturation region in the hysteresis curve to achieve the switching between the off and on states.

[0003] like Figure 1 As shown, in the hysteresis curve of the magnetic compression device, when the iron core works in the saturation state, the corresponding magnetic switch presents a small inductance characteristic, and the magnetic switch is in the on state; when the iron core works in the linear region, the corresponding magnetic switch presents a large inductance characteristic, and the magnetic switch is in the off state; when the working point of the iron core changes from the reverse saturation region to the forward saturation region, the magnetic swing reaches the maximum.

[0004] Considering the manufacturer's process characteristics and application scenarios (high voltage, high dB / dt), if a rectangular core is used, the lead angle processing is difficult and cannot meet the inductance requirements. In current designs, a ring core is usually used. By reasonably designing the parameters, the inductance before and after saturation can be very different. During the charging process of the input capacitor, very little energy is transferred to the output capacitor, and the inductance is very small after saturation, thereby achieving the effect of compressing the pulse width. In practical applications, the output voltage peak of the magnetic switch can be adjusted by controlling the starting working point of the core. Summary of the invention

[0005] The invention designs a winding skeleton of a magnetic compression device according to the characteristics of the winding of a magnetic compression device of a pulse corona plasma power supply.

[0006] The specific technical solutions of the present invention are as follows:

[0007] A winding skeleton of a magnetic compression device comprises a primary winding device at a lower layer and a secondary winding device at an upper layer, wherein the upper layer has sparse winding and the lower layer has dense winding, and both the two-stage winding devices adopt a circular ring structure, and are respectively formed by stacking and fixing three layers of annular discs and two layers of annular iron cores; the wire of each winding device is wound on the disc, and an insulating distance is left between the wire and the iron core after winding; an oil gap pad is provided at the matching position of each iron core and the disc, and an oil gap is formed between the disc and the iron core after installation, for transformer oil to flow in; each disc is provided with a fan-shaped boss for winding a bias magnetic winding; the primary winding device and the secondary winding device are first assembled separately through a connecting piece, and after winding, the two-stage winding devices are assembled together;

[0008] In the primary winding device, a boss-type wire-dividing structure is provided on the disc, and the boss-type wire-dividing structure is provided at least on the outer ring of the disc;

[0009] In the secondary winding device, a tooth-shaped wire-dividing structure is provided on the disc, and the tooth-shaped wire-dividing structure is provided at least on the outer ring of the disc.

[0010] Preferably, in the primary winding device, the three disks are all provided with a boss-type wire-dividing structure, the boss-type wire-dividing structure is a winding boss, and the outer rings of the three disks are all provided with corresponding winding bosses.

[0011] Preferably, in the primary winding device, the winding bosses are distributed on both sides of the fan-shaped boss, and eight groups of winding bosses are evenly arranged on the outer ring of each disc.

[0012] Preferably, in the secondary winding device, the three disks are provided with a toothed wire dividing structure, the toothed wire dividing structure is a winding tooth shape, and the outer and inner circles of the three disks are provided with corresponding winding teeth; each section of high-voltage wire is confined in a tooth groove formed by a group of winding teeth.

[0013] Preferably, in the secondary winding device, the winding tooth profile is formed by flat teeth arranged on the outer ring and / or inner ring of the disc.

[0014] Preferably, two groups of the fan-shaped bosses are symmetrically provided on each disc, and mounting holes are provided on the outer protruding parts of the two fan-shaped bosses for connecting the winding device; one group of the fan-shaped bosses is also provided with an inner protruding part for winding the bias winding.

[0015] Preferably, the connecting piece adopts a screw-nut assembly and is installed through a mounting hole group on the disc.

[0016] Preferably, a long screw is used when the primary and secondary winding devices are assembled with each other, and both ends of the long screw extend out of the frame for a certain distance, so as to fix the frame in the air inside the transformer oil tank.

[0017] Preferably, the disc and the cushion block are both made of FR4 glass fiber epoxy resin material; and the screw nut assembly is made of aramid glass fiber material.

[0018] Preferably, a slot for positioning the iron core is provided on the oil gap pad.

[0019] Preferably, the central angle corresponding to the fan-shaped boss is 15°-35°.

[0020] This application improves the existing rectangular core structure and adopts a ring core for design. This structure is different from the winding process of the rectangular core. The winding skeleton of the magnetic compression device needs to be designed under the condition of satisfying the core shape, working principle, and optimal working state. The design principle is as follows Figure 2-1 shown.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The skeleton structure designed by the present invention can meet the requirements of the iron core shape of the magnetic compression device and can realize the optimal working state and operation requirements of the magnetic compression device;

[0023] 2. The skeleton material used in the present invention has good electrical properties and mechanical strength, and is easy to process and shape, and is convenient for mass production; the skeleton material is oil-resistant and corrosion-resistant, and is not easy to deteriorate or decompose under high voltage conditions;

[0024] 3. The present invention adopts two-stage magnetic compression devices which are wound separately and then assembled into a whole, and the winding skeletons are designed respectively according to the different numbers of turns of the two-stage magnetic compression devices, thereby reducing the insulation pressure and installation difficulty;

[0025] 4. The diameter of the disc of the present invention is larger than the diameter of the iron core, which can meet the insulation requirements between the high-voltage conductor and the iron core;

[0026] 5. The present invention designs an overhead spacer between the iron core and the winding disc to form an oil gap, which can meet the heat dissipation and insulation requirements of the iron core;

[0027] 6. The top and bottom of the device of the present invention are designed with screws extending a certain length to facilitate installation and fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the hysteresis curve of the magnetic compression device;

[0029] Figure 1 In: Bs-saturation magnetic induction intensity; ur_sat-unsaturated magnetic permeability; Hc-coercive force; ΔBmax-maximum change magnetic flux density;

[0030] Figure 2-1 Design a schematic for a magnetic compression device;

[0031] Figure 2-2 Design drawing for the core bandwidth size;

[0032] Figure 2-1 and Figure 2-2 In: Ra-outer diameter; Rb-inner diameter; Rd-outer diameter of the skeleton; RC-inner diameter of the skeleton; h1-insulation distance between the skeleton and the core; h2-position of the high-voltage winding; h3-position of the bias winding; a-thickness of the core stack; b-width of the core;

[0033] Figure 3 It is a front view of the winding skeleton of the magnetic compression device in the embodiment;

[0034] Figure 4 It is a right side view of the winding frame of the magnetic compression device in the embodiment;

[0035] Figure 5 A three-dimensional diagram of a winding frame of a magnetic compression device in an embodiment;

[0036] Figure 6 Schematic diagram of the segmented disc structure in the embodiment;

[0037] Figure 7 This is a schematic diagram of the toothed disc structure in the embodiment;

[0038] Figure 8 It is a schematic diagram of the oil gap pad structure;

[0039] In the figure: 1-toothed disc; 11-winding tooth shape; 12-inner teeth; 13-outer teeth; 2-secondary iron core; 3-oil gap pad; 4-segmented disc; 41-winding boss; 5-primary iron core; 6-secondary fastening screw; 7-primary fastening screw; 8-long screw; 9-fan-shaped boss; 91-inner convex. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings: Embodiment 1:

[0041] like Figure 3 As shown, the winding skeleton of the magnetic compression device of the present invention is suitable for the magnetic compression device of the pulse corona plasma power supply as a winding skeleton, and can be loaded with the magnetic compression device configured by the pulse corona plasma power supply. It includes upper and lower winding devices. The lower primary winding device and the upper secondary winding device, the skeleton divides the winding into upper and lower parts with different winding methods according to the number of turns of the two-stage winding device, the upper winding is sparse, and the lower winding is dense.

[0042] The two-stage winding device adopts a circular ring structure, and the skeleton has a total of six layers of discs and four layers of iron cores stacked. It is respectively composed of three layers of annular discs and two layers of annular iron cores stacked and fixedly connected. In order to ensure that the high-voltage wire does not displace and cause discharge after winding, the wire of each stage of the winding device is wound on the disc from the outside to the inside, and an insulating gap is left between the wire and the iron core after winding; each iron core and the disc are equipped with an oil gap pad 3, and after installation, an oil gap is formed between the disc and the iron core for transformer oil to flow in and increase insulation performance.

[0043] Each disc is provided with a fan-shaped boss for winding the bias magnetic winding, and the fan-shaped bosses of the secondary and secondary winding devices are located on the same side and in corresponding positions. The disc is also provided with mounting holes. For the convenience of assembly, the mounting holes can be located on the fan-shaped bosses. The mounting holes include holes for assembling the primary and secondary winding devices respectively, and holes for assembling each other. For the sake of assembly balance, the fan-shaped bosses can be symmetrically arranged in another group and assembled symmetrically through the mounting holes. If only one group of fan-shaped bosses is provided, mounting holes are required to be added to the disc part. The two-stage winding devices are first assembled separately, and after winding separately, the two stages are assembled together. The wound first-stage magnetic compression device is assembled in series with the second-stage magnetic compression device.

[0044] Each of the three discs of the primary winding device of the lower layer is provided with a boss-type wire dividing structure (also called segmented disc 4), and a winding boss 41 is provided on the outer ring of the segmented disc 4. Since the winding of the lower layer is dense, the winding bosses can be sparsely arranged in a few groups.

[0045] Each of the three discs of the upper secondary winding device is provided with a toothed wire dividing structure (also referred to as a toothed disc 1), and the inner and outer rings of the toothed disc 1 are provided with corresponding winding tooth shapes 11. In the secondary winding device, the winding tooth grooves are formed by flat teeth provided on the outer and / or inner rings of the discs. Since the winding of the upper layer is sparse, the winding tooth grooves are arranged alternately.

[0046] The skeleton of the magnetic compression device of the present invention adopts an annular iron core, and the two-stage magnetic compression devices have different numbers of winding turns and thicker wire diameters, and must be wound on a fixed and reliable winding skeleton. The skeleton is required to adapt to the shape of the annular iron core of the magnetic compression device, and must also meet the electrical insulation performance, oil resistance and temperature resistance, and have sufficient mechanical strength and be easy to wind. At the same time, it is also necessary to consider overcoming the parasitic capacitance between winding turns and layers. The tooth-shaped and boss-type structural disks are connected in series to enhance the fixation of the winding and use the structure to clamp and fix the annular iron core of the magnetic compression device. The electrical isolation function of the structural component itself meets the electrical insulation requirements between the iron core and the wire, and between the iron core and the iron core. Embodiment 2:

[0047] Optionally in this example, the primary winding device of the lower layer is formed by stacking and fixing three annular discs and two annular iron cores. Since the primary winding device of the lower layer has a large number of turns, the upper and lower discs are segmented to facilitate the close arrangement of the wires in the segments. Both discs are provided with a boss-type wire dividing structure, also called a segmented disc 4, and the outer circles of the two segmented discs are provided with corresponding winding bosses 41. The middle disc is not provided with a winding boss, and no wire limiting is performed. The middle layer of discs plays a supporting role to prevent the insufficient insulation distance from the iron core due to the soft material of the wire. Embodiment three:

[0048] Optionally, in this example, the upper secondary winding device uses tooth separation due to the small number of turns. It is formed by stacking and fixing three annular discs and two annular iron cores. In the secondary winding device, the upper and lower discs are provided with a toothed wire dividing structure, also called a toothed disc 1, and the outer and inner circles of the two toothed discs are provided with corresponding winding teeth 11; each section of high-voltage wire is confined to the tooth groove formed by a group of teeth corresponding to the upper and lower discs. The middle disc does not have a winding tooth shape, and does not limit the wire. The middle layer of discs plays a supporting role to prevent the insufficient insulation distance from the iron core due to the soft material of the wire. Embodiment 4:

[0049] In this example, optionally, Figure 5 As shown, the primary winding device of the lower layer adopts segmented separation due to the large number of turns, that is, the wires in each segment are closely arranged. In the primary winding device, the three discs are provided with a boss-type wire dividing structure, also known as a segmented disc 4, and the outer rings of the three discs are provided with corresponding winding bosses 41.

[0050] At the same time, the upper secondary winding device adopts tooth separation due to the small number of turns. In the secondary winding device, three discs are provided with tooth separation structures, also called toothed discs 1, and the outer and inner circles of the three toothed discs are provided with corresponding winding tooth shapes 11.

[0051] The connecting piece adopts a screw-nut assembly; the winding devices of the upper and lower layers are fixed with short screws, namely the primary fastening screw 7 and the secondary fastening screw 6. The primary and secondary winding devices are combined with a long screw 8, and the two ends of the long screw 8 extend out of the frame for a distance, which is used to fix the frame in the transformer oil tank. The frame forms a whole, and the oil gap formed by the oil gap pad and the screw can meet the heat dissipation and insulation requirements.

[0052] The high voltage wire winding method of the present invention is as follows:

[0053] like Figure 1 As shown, the starting wire of the high-voltage wire is wound from the outer circle of the lowest layer of the segmented disk 4 of the primary winding device, crosses two layers of iron core and winds into the inner circle and then winds down to complete one turn. The high-voltage wires are closely arranged, and after one segment is full, it crosses into another segment for winding, separated by a boss in the middle, and so on to wind the first-stage magnetic compression device.

[0054] Then as Figure 1 As shown, the starting wire of the high-voltage conductor is wound from the outer circle of the lowest layer of the toothed disc 1 of the secondary magnetic device, crossed over two layers of iron core and wound into the inner circle, and then wound down, thus completing one turn. The high-voltage conductor is embedded in the slot formed by the tooth shape, and the middle is separated by the tooth shape, and the second-stage magnetic compression device is wound in this way.

[0055] In this example, two fan-shaped bosses with the same angle are provided, and the outer protruding parts of the two fan-shaped bosses are arranged for inserting the screw; one group of fan-shaped bosses is provided with an inner protruding part, which serves as a bias winding winding frame for winding the bias winding.

[0056] Finally Figure 1 As shown, the two-stage magnetic compression device is arranged in sequence and fastened with a long screw to complete the device assembly. Embodiment five:

[0057] In this example, optionally, Figure 6 , Figure 7 As shown, two groups of fan-shaped bosses are symmetrically arranged on each disc, and mounting holes are arranged on the outer protruding parts of the two fan-shaped bosses. The mounting includes holes for separate assembly and holes for mutual assembly, which are used for connecting the winding device; one group of fan-shaped bosses is provided with an inner convex part for winding the bias winding. In this example, the corresponding central angles of the two groups of fan-shaped bosses are equal, and can be selected within the angle range of 15°-35°, and the angle is mainly to meet the installation strength requirements. Embodiment six:

[0058] Optionally, in this example, in the primary winding device, the winding bosses are distributed on both sides of the fan-shaped boss, and eight groups of winding bosses are provided corresponding to the inner ring and the outer ring. Embodiment seven:

[0059] In this example, optionally, Figure 8 As shown, the oil gap pad 3 is provided with a slot for positioning the core, and the slot is adapted to the width of the annular core. In the first and second stages, two groups of oil gap pads 3 are symmetrically arranged on each mating surface between the annular disc and the annular core, and are located at the two fan-shaped bosses of the annular disc and adapted to its shape. There are also mounting holes for threading screws and other connectors. The disc and the pad are made of FR4 glass fiber epoxy resin; the screw and nut assembly is made of aramid glass fiber. Both can meet the requirements of mechanical strength and electrical insulation performance. The thickness of the oil gap pad is 3-8mm, and the specific thickness can be designed to be 5mm. The slot of the oil gap pad 3 raises the core and the disc out of the oil gap to meet the insulation requirements. Embodiment eight:

[0060] according to Figure 2-1 The design principle of the magnetic compression device, the specific design of this application is as follows, among which:

[0061] Ra-outer diameter; Rb-inner diameter; Rd-outer diameter of the skeleton; RC-inner diameter of the skeleton; h1-insulation distance between the skeleton and the core; h2-position of the high-voltage winding; h3-position of the bias winding; a-thickness of the core stack; b-width of the core, such as Figure 2-2 shown.

[0062] A two-stage magnetic compression device, each stage is assembled by three annular discs and two annular iron core spacers.

[0063] According to the working conditions, a magnetic compression device ring core is designed with the cross-sectional dimensions: a, b;

[0064] Ring core diameter dimensions: inner diameter Rb, outer diameter Ra; insulation spacing: h1;

[0065] The dimensions of the skeleton disc are: outer diameter Rd, inner diameter Rc; thickness of skeleton material: t; oil gap: e.

[0066] The skeletons from top to bottom are respectively a second-stage magnetic compression device and a first-stage magnetic compression device.

[0067] Height of secondary magnetic compression device: H1=3t+4e+2a;

[0068] Height of the first-stage magnetic compression device: H2=3t+4e+2a;

[0069] Two-stage magnetic compression device assembly distance: H3;

[0070] The extension length of the mounting screws at both ends: H4;

[0071] Overall height of magnetic compression device: H=H1+H2+H3+H4

[0072] like Figure 6 As shown, the toothed disc 1 has 20 notches on both sides of the inner and outer circles, which are symmetrically distributed and separated by teeth. The width and depth of the inner and outer grooves depend on the diameter of the wound high-voltage wire. The inner diameter (excluding the tooth height) is 35mm smaller than the inner diameter of the ring core, and the outer diameter (excluding the tooth height) is 35mm larger than the outer diameter of the ring core. The disc is used to wind the secondary magnetic compression device and is assembled in series with the first stage;

[0073] like Figure 7 As shown, the segmented disc is divided into 4 sections on both sides, which are symmetrically distributed and separated by bosses. The inner diameter is 35mm smaller than the inner diameter of the ring core, and the outer diameter (without the boss height) is 35mm larger than the outer diameter of the ring core. It is used to wind the first-stage magnetic compression device and is assembled in series with the second stage.

[0074] The corresponding central angles of the two sets of fan-shaped bosses are equal, and can be between 15° and 35°. One set of fan-shaped bosses is also provided with an inner convex portion, and the bias winding is wound on the fan-shaped bosses. Both the outer convex portion and the inner convex portion are provided with threading holes, and the bias winding is wound through the two holes.

Claims

1. A winding skeleton for a magnetic compression device, comprising a primary winding device at a lower layer and a secondary winding device at an upper layer, wherein the winding at the upper layer is sparse and the winding at the lower layer is dense, and the characteristics are: The two-stage winding device adopts a circular ring structure, which is respectively composed of three layers of annular discs and two layers of annular iron cores stacked and fixedly connected; the wire of each winding device is wound on the disc, and an insulating gap is left between the wire and the iron core after winding; an oil gap pad is provided at the matching position of each iron core and the disc, and an oil gap is formed between the disc and the iron core after installation for transformer oil to flow in; each disc is provided with a fan-shaped boss for winding the bias winding; the first-stage winding device and the second-stage winding device are assembled separately through the connecting piece, and after winding them separately, the two-stage winding devices are assembled together; In the primary winding device, a boss-type wire-dividing structure is provided on the disc, and the boss-type wire-dividing structure is provided at least on the outer ring of the disc; In the secondary winding device, a tooth-shaped wire-dividing structure is provided on the disc, and the tooth-shaped wire-dividing structure is provided at least on the outer ring of the disc; Two groups of the fan-shaped bosses are symmetrically arranged on each disc, and mounting holes are arranged on the outer protruding parts of the two fan-shaped bosses for connecting the winding device; one group of the fan-shaped bosses is also provided with an inner protruding part for winding the bias magnetic winding; The connecting piece adopts a screw-nut assembly and is assembled through the mounting hole of the protruding part of the fan-shaped boss; The oil gap pad is provided with a slot for positioning the iron core.

2. The winding frame of the magnetic compression device according to claim 1, characterized in that: In the primary winding device, the three discs are all provided with a boss-type wire-dividing structure, the boss-type wire-dividing structure is a winding boss, and the outer rings of the three discs are all provided with corresponding winding bosses.

3. The winding frame of the magnetic compression device according to claim 2, characterized in that: In the primary winding device, the winding bosses are distributed on both sides of the fan-shaped boss, and eight groups of winding bosses are evenly arranged corresponding to the outer ring of each disc.

4. The winding frame of the magnetic compression device according to claim 2, characterized in that: In the secondary winding device, the three discs are all provided with a tooth-shaped wire dividing structure, the tooth-shaped wire dividing structure is a winding tooth shape, and the outer rings and inner rings of the three discs are all provided with corresponding winding tooth shapes.

5. The winding frame of the magnetic compression device according to claim 4, characterized in that: In the secondary winding device, the winding tooth profile is formed by flat teeth arranged on the outer ring and / or inner ring of the disc.

6. The winding frame of the magnetic compression device according to any one of claims 1 to 5, characterized in that: The primary and secondary winding devices are assembled with each other using long screws, both ends of which extend out of the frame for a certain distance, so as to suspend and fix the frame inside the transformer oil tank.

7. The winding frame of the magnetic compression device according to claim 6, characterized in that: The disc and the cushion block are both made of FR4 glass fiber epoxy resin material; the screw nut assembly is made of aramid glass fiber material.

8. The winding frame of the magnetic compression device according to claim 1, characterized in that: The central angle corresponding to the fan-shaped boss is 15°-35°.

Images