Repeated paint dipping shielding isolation transformer

Abstract

The utility model relates to a multi-time paint dipping shielding isolation transformer, which comprises a transformer silicon steel sheet, and the transformer silicon steel sheet is provided with two magnetic core side columns and a magnetic core center column; the input side windings are respectively arranged on the two magnetic core side columns and the magnetic core center column in the middle, and the input side windings are provided with input ends used for being connected with a power supply; the first paint dipping isolation layer is arranged on the input side winding; the output side winding is arranged on the first paint dipping isolation layer, and the output side winding is provided with an output end for outputting electric power; and the third paint dipping isolation layer is arranged on the output side winding. Through the use of the first paint dipping isolation layer and the third paint dipping isolation layer, a gap possibly generated between the input end and the output end of the isolation transformer is completely blocked, parasitic capacitance almost does not exist and is close to zero, then the output end and the input end are completely and electromagnetically isolated, and the output end does not have any electric energy leakage to the ground; the device can be safely used when being applied to flammable and explosive places such as petroleum gas, coal bed gas and combustible ice.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a multiple-dip paint shielding isolation transformer. Background Art

[0002] Isolation transformers are electrical components frequently used in circuits. Their main functions include voltage conversion, impedance conversion, current conversion, and isolation.

[0003] At present, there are many gaps between the input winding and the output winding of the dry-type isolation transformer. These gaps of different sizes form parasitic capacitance. These parasitic capacitances conduct the input and output ends, making it impossible for the isolation transformer to achieve complete isolation. In other words, due to the existence of parasitic capacitance, there will be uncertain leakage voltage and current at the output end, causing leakage to the ground at the output end, causing various uncertain hidden dangers such as sparks and electric shock injuries. For example, when used in flammable and explosive environments, as the positive and negative poles of the alternating current at the input end are converted, the leakage energy of the parasitic capacitance to the ground will continue to bring disaster risks.

[0004] Therefore, it is urgent to provide a multiple-dip paint shielding isolation transformer to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on this, a multi-dip paint shielding isolation transformer is provided, in which the parasitic capacitance between the input and output ends is close to zero, the output and input ends are completely electromagnetically isolated, and there will be no electrical energy leakage to the ground at the output end. The isolation transformer can be safely used in flammable and explosive places such as petroleum gas, coalbed methane, and combustible ice.

[0006] On the one hand, a multiple-dip paint shielding isolation transformer is provided, including: a transformer silicon steel sheet, the transformer silicon steel sheet is provided with two core side columns and a core center column located in the middle; an input side winding, the input side winding is respectively arranged on the two core side columns and the middle core center column, and the input side winding is provided with an input end, and the input end is used to connect to a power supply; a first dip paint isolation layer, the first dip paint isolation layer is respectively arranged on the input side winding; an output side winding, the output side winding is respectively arranged on the first dip paint isolation layer, and the output side winding is provided with an output end, and the output end is used to output power; a third dip paint isolation layer, the third dip paint isolation layer is respectively arranged on the output side winding.

[0007] An optional solution is that the input side winding includes an input wire, which is wound on the corresponding magnetic core side column or the magnetic core center column to form an input coil; one end of the input wire of all the input side windings is connected to each other, and the other end is led out to form three input ends.

[0008] An optional solution is that the first varnish isolation layer wraps the input coil.

[0009] An optional solution is that a shielding winding is also arranged between each group of the input side windings and the output side windings; the shielding winding comprises a metal sheet, which is wrapped around the first varnished isolation layer; the metal sheets of all the shielding windings are connected to each other through conductors, and one of the conductors is grounded.

[0010] An optional solution is to wrap the metal sheet with a second varnish insulating layer.

[0011] An optional solution is that the output side winding includes an output wire, which is wound on the second varnish-impregnated isolation layer to form an output coil; one end of the output wire of all the output side windings is connected to each other, and the other end is led out to form three output ends.

[0012] An optional solution is that the third varnish-impregnated isolation layer wraps the output coil.

[0013] Optionally, the metal sheet includes copper foil or aluminum foil.

[0014] On the other hand, a method for preparing a multiple-dip paint shielding isolation transformer is also provided, comprising the following steps:

[0015] On the transformer silicon steel sheet, three input wires are wound around two magnetic core side columns and the middle magnetic core center column of the transformer silicon steel sheet to form an input coil. One ends of the three input wires are connected to each other, and the other ends are respectively led out as input ends for connecting to a power supply.

[0016] Performing multiple varnishing on the three input coils to form a first varnishing isolation layer on the input coils;

[0017] Wrapping metal sheets on the first varnish-impregnated isolation layer, and connecting the three wrapped metal sheets together using conductors, and one of the conductors is grounded;

[0018] Performing multiple varnishing on the three wrapped metal sheets to form a second varnishing isolation layer on the metal sheets;

[0019] Using three output wires to be respectively wound on the second varnish-impregnated isolation layer to form an output coil, one end of the three output wires are connected to each other, and the other ends are respectively led out as output ends for outputting electricity;

[0020] The three output coils are dipped in varnish for multiple times to form a third dip-varnish isolation layer on the output coils.

[0021] An optional solution is that in the multiple immersion process, the immersion time is 15-20 minutes and the immersion temperature is 110-150°.

[0022] Beneficial effects:

[0023] The above-mentioned multiple-paint-shielded isolation transformer and preparation method have a first paint-impregnated isolation layer on the input side winding, an output side winding on a paint-impregnated isolation layer, and a third paint-impregnated isolation layer on the output side winding. Thus, all gaps between the input side winding and the output side winding are eliminated by using the first paint-impregnated isolation layer and the third paint-impregnated isolation layer to eliminate the parasitic capacitance caused by these gaps, and then the parasitic capacitance between the input end and the output end is close to zero, the output end and the input end are completely electromagnetically isolated, and there will be no leakage of electrical energy to the ground at the output end. Therefore, the isolation transformer can be safely used in flammable and explosive places such as petroleum gas, coalbed methane, and combustible ice. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram showing that the input side winding is wound on the transformer silicon steel sheet in the multiple-dip paint shielding isolation transformer of this embodiment;

[0025] Figure 2 It is a schematic structural diagram showing that the first varnish-impregnated isolation layer wraps the input side winding in the multiple varnish-impregnated shielded isolation transformer of this embodiment;

[0026] Figure 3 It is a structural schematic diagram showing the shielding winding wrapped with the first varnishing isolation layer in the multiple varnishing shielding isolation transformer of this embodiment;

[0027] Figure 4 It is a structural schematic diagram showing the shielding winding wrapped by the second varnish-impregnated isolation layer in the multiple varnish-impregnated shielding isolation transformer of this embodiment;

[0028] Figure 5 It is a schematic structural diagram showing that the output side winding is wound on the second varnish-impregnated isolation layer in the multiple varnish-impregnated shielding isolation transformer of this embodiment;

[0029] Figure 6 It is a schematic structural diagram showing the output side winding wrapped by the third varnish-impregnated isolation layer in the multiple varnish-impregnated shielding isolation transformer of this embodiment.

[0030] Figure numerals: 1. Transformer silicon steel sheet; 11. Core side column; 12. Core center column; 2. Input side winding; 21. Input wire; 22. Input coil; 3. First varnished isolation layer; 4. Output side winding; 41. Output wire; 42. Output coil; 5. Third varnished isolation layer; 6. Shielding winding; 61. Metal sheet; 7. Conductor; 8. Second varnished isolation layer. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of 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.

[0032] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0034] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] The embodiment of the present application provides a multiple-dip paint shielding isolation transformer and a preparation method. The gap that may occur between the input and output ends of the isolation transformer is completely blocked, and there is almost no parasitic capacitance, which is close to zero. Then the output and input ends are completely electromagnetically isolated, and there will be no leakage of electric energy to the ground at the output end. It can be used safely in flammable and explosive places such as petroleum gas, coalbed methane, and combustible ice.

[0036] The following is a detailed description of a multiple-dip paint shielding isolation transformer provided by this embodiment in conjunction with the accompanying drawings. Figure 1-Figure 6As shown, it includes: a transformer silicon steel sheet 1, an input side winding 2 and an output side winding 4, the transformer silicon steel sheet 1 is provided with two magnetic core side columns 11 and a magnetic core center column 12 located in the middle; the input side winding 2 is respectively arranged on the two magnetic core side columns 11 and the middle magnetic core center column 12, and the input side winding 2 is provided with an input end, and the input end is used to connect to a power supply; a first varnished isolation layer 3 is correspondingly arranged on each input side winding 2, and the output side winding 4 is respectively arranged on the first varnished isolation layer 3, and the output side winding 4 is provided with an output end, and the output end is used to output electricity; a third varnished isolation layer 5 is correspondingly arranged on each output side winding 4.

[0037] In this embodiment, a first varnished isolation layer 3 is arranged on the input side winding 2, the output side winding 4 is arranged on the first varnished isolation layer 3, and a third varnished isolation layer 5 is arranged on the output side winding 4. Thus, all gaps between the input side winding 2 and the output side winding 4 are eliminated by using the first varnished isolation layer 3 and the third varnished isolation layer 5 to eliminate the parasitic capacitance caused by these gaps, and then the parasitic capacitance between the input end and the output end is close to zero, the output end and the input end are completely electromagnetically isolated, and there will be no leakage of electric energy to the ground at the output end. Thus, the shielded isolation transformer can be safely used in flammable and explosive places such as petroleum gas, coalbed methane, and combustible ice.

[0038] Please refer to Figure 1 As shown, in this embodiment, it should be noted that the input side winding 2 includes an input wire 21, which is wound on the corresponding magnetic core side column 11 or the magnetic core center column 12 to form an input coil 22; one ends of the input wires 21 of all input side windings 2 are connected to each other, and the other ends are respectively led out to form three input ends.

[0039] Specifically, on the transformer silicon steel sheet 1, three input wires 21 are respectively wound on two core side columns 11 and one core center column 12 to form an input coil 22. One ends of the three input wires 21 are connected to each other and tinned. The tinning process can ensure that the connection parts are integrated, ensure optimal conductivity, and are firmly fixed; the other ends of the three input wires 21 are respectively led out to form three input terminals ABC for connecting to a power supply.

[0040] Please refer to Figure 1 , Figure 2 As shown, in this embodiment, it is also necessary to explain that the first varnished isolation layer 3 wraps the input coil 22. It can be understood that the three input coils 22 formed on the two core side columns 11 and the middle core center column 12 are varnished multiple times to form the first varnished isolation layer 3. The multiple varnishing ensures that the first varnished isolation layer 3 completely wraps the input coil 22 and all gaps in the input coil 22 are eliminated to eliminate the parasitic capacitance caused by these gaps.

[0041] Please refer to Figure 1-Figure 3 As shown, in some embodiments, a shielding winding 6 is further arranged between each group of input side windings 2 and output side windings 4, and the shielding winding 6 includes a metal sheet 61, and the metal sheet 61 is wrapped around the first varnished isolation layer 3; the metal sheets 61 of all shielding windings 6 are connected to each other through conductors 7, and one of the conductors 7 is grounded.

[0042] Specifically, after the input coil 22 of the input side winding 2 is completely free of gaps after multiple varnishing, wait for the paint to solidify, and before it is completely dry, respectively wrap the metal sheets 61 on the first varnishing isolation layer 3, and completely wrap the first varnishing isolation layer 3 by wrapping the metal sheets 61. Of course, the wrapping of the metal sheets 61 is not limited to one circle, and the overlapping parts of the two ends of the wrapped metal sheets 61 ensure good conductivity when multiple circles are wrapped, and the three wrapped metal sheets 61 are connected together with conductors 7 for good conductivity, and one of the conductors 7 is grounded. Preferably, the metal sheets 61 include but are not limited to conductive metal materials such as copper foil or aluminum foil. Wrapping the metal sheets 61 when the varnish is not completely dry can avoid cracks when painting again later.

[0043] Please refer to 1. Figure 3 , Figure 4 As shown, in some embodiments, a second varnished insulating layer 8 is respectively wrapped on the metal sheets 61 .

[0044] Specifically, the three input coils 22 wrapped with the metal sheet 61 are dipped in paint multiple times to form a second dip-paint isolation layer 8. Multiple dips in paint ensure that there is no gap between the input coil 22 and the wrapped metal sheet 61, so that the input side winding 2 and the wrapped metal sheet 61 are fully dipped in paint without any gap. After multiple dips in paint, wait for the paint to dry completely.

[0045] Please refer to Figure 4 , Figure 5 As shown, in this embodiment, it is also necessary to explain that the output side winding 4 includes an output wire 41, and the output wire 41 is wound on the second varnish-impregnated isolation layer 8 to form an output coil 42; one ends of the output wires 41 of all output side windings 4 are connected to each other, and the other ends are respectively led out to form three output ends.

[0046] Specifically, three output wires 41 are respectively wound on the second varnish-impregnated isolation layer 8 to form an output coil 42. One ends of the three output wires 41 are connected to each other and tinned. The tinning treatment ensures that the connection parts are integrated, ensures optimal conductivity, and are firmly fixed; the other ends of the three output wires 41 are respectively led out to three output terminals abc for outputting electricity.

[0047] Please refer to Figure 5 , Figure 6 As shown, in some embodiments, the third varnished insulation layer 5 wraps the output coil 42 .

[0048] Specifically, the three output coils 42 are dipped in paint multiple times to form a third dip-paint isolation layer 5. Multiple dips in paint ensure that there is no gap between the output coil 42 and the wrapped metal sheet 61, so that the output side winding 4 and the wrapped metal sheet 61 are fully dipped in paint without any gap. After multiple dips in paint, wait for the paint to dry completely.

[0049] This embodiment also provides a method for preparing a multiple-dip paint shielding isolation transformer, comprising the following steps:

[0050] S101, on the transformer silicon steel sheet 1, three input wires 21 are used to wind around two magnetic core side columns 11 and the middle magnetic core center column 12 of the transformer silicon steel sheet 1 to form an input coil 22, one ends of the three input wires 21 are connected to each other, and the other ends are respectively led out as input ends for connecting to a power supply;

[0051] S102, performing multiple varnishing on the three input coils 22 to form a first varnishing isolation layer 3 on the input coils 22;

[0052] S103, wrapping the metal sheet 61 on the first varnish-impregnated isolation layer 3, and connecting the three wrapped metal sheets 61 to each other using conductors 7, and one of the conductors 7 is grounded;

[0053] S104, performing multiple varnishing on the three wrapped metal sheets 61 to form a second varnishing isolation layer 8 on the metal sheets 61;

[0054] S105, using three output wires 41 to be respectively wound on the second varnish-impregnated isolation layer 8 to form output coils 42, one ends of the three output wires 41 are connected to each other, and the other ends are respectively led out as output ends for outputting electricity;

[0055] S106 , performing varnish dipping on the three output coils 42 formed multiple times to form a third varnish dipping isolation layer 5 on the output coils 42 .

[0056] Wherein, in the above-mentioned multiple varnishing processes, the varnishing time is 15-20 minutes, and the varnishing temperature is 110-150°.

[0057] The implementation principle of this embodiment is as follows: by using the first varnished isolation layer 3, the second varnished isolation layer 8 and the third varnished isolation layer 5, all the gaps between the input side winding 2 and the output side winding 4 are filled and eliminated to eliminate the parasitic capacitance caused by these gaps, and then the parasitic capacitance between the input end and the output end is close to zero, the output end and the input end are completely electromagnetically isolated, and various risks at the input end can hardly affect the output end, and there will be no leakage of electrical energy to the ground at the output end; at the same time, the metal sheet 61 arranged between the input side winding 2 and the output side winding 4 is like a metal barrel, which can hold the input side winding 2 and the output side winding 4 together. The side winding 2 is completely covered. When various noises and electromagnetic waves at the input end want to interfere with the output end, these noises must penetrate the metal sheet 61 to reach the output end. When the noises penetrate the metal sheet 61, the noises produce a Faraday cage effect in the metal barrel. Part of the electromagnetic effect produced by these noises in the metal barrel forms an electric potential, which is introduced into the ground through the grounding of the metal sheet 61, and part of it generates heat and is consumed, resulting in the noises being unable to penetrate the metal sheet 61, thereby isolating the input end from various uncertain electromagnetic, noise and other interferences to the output end.

[0058] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A multiple-dip paint shielding isolation transformer, characterized in that: include: A transformer silicon steel sheet (1), wherein the transformer silicon steel sheet (1) is provided with two magnetic core side columns (11) and a magnetic core center column (12) located in the middle; An input side winding (2), the input side winding (2) being respectively arranged on the two magnetic core side columns (11) and the middle magnetic core center column (12), and the input side winding (2) being provided with an input end, the input end being used to connect to a power supply; A first varnish-impregnated isolation layer (3), wherein the first varnish-impregnated isolation layer (3) is respectively and correspondingly arranged on the input side winding (2); Output side windings (4), the output side windings (4) are respectively arranged on the first varnish-impregnated isolation layer (3), and the output side windings (4) are provided with output ends, and the output ends are used to output electricity; A third varnish-impregnated isolation layer (5), wherein the third varnish-impregnated isolation layer (5) is respectively and correspondingly arranged on the output side windings (4).

2. The multiple-dip paint shielding isolation transformer according to claim 1 is characterized in that: The input side winding (2) comprises an input conductor (21), wherein the input conductor (21) is wound on the corresponding magnetic core side column (11) or the magnetic core center column (12) to form an input coil (22); One ends of the input wires (21) of all the input side windings (2) are connected to each other, and the other ends are respectively led out to form three input ends.

3. The multiple-dip paint shielding isolation transformer according to claim 2 is characterized in that: The first varnish-impregnated insulating layer (3) wraps the input coil (22).

4. The multiple-dip paint shielding isolation transformer according to claim 3 is characterized in that: A shielding winding (6) is also provided between each group of the input side winding (2) and the output side winding (4); The shielding winding (6) comprises a metal sheet (61), and the metal sheet (61) is wound around and wrapped around the first varnish-impregnated isolation layer (3); The metal sheets (61) of all the shielding windings (6) are connected to each other via conductors (7), and one of the conductors (7) is grounded.

5. The multiple-dip paint shielding isolation transformer according to claim 4 is characterized in that: A second varnish insulating layer (8) is wrapped on the metal sheet (61).

6. The multiple-dip paint shielding isolation transformer according to claim 5 is characterized in that: The output side winding (4) comprises an output conductor (41), wherein the output conductor (41) is wound on the second varnish-impregnated isolation layer (8) to form an output coil (42); One ends of the output conductors (41) of all the output side windings (4) are connected to each other, and the other ends are respectively led out to form three output ends.

7. The multiple-dip paint shielding isolation transformer according to claim 6 is characterized in that: The third varnish-impregnated isolation layer (5) wraps the output coil (42).

8. The multiple-dip paint shielding isolation transformer according to claim 4 is characterized in that: The metal sheet (61) comprises copper foil or aluminum foil.

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