High-voltage isolation transformer

Abstract

The utility model relates to the technical field of transformer insulation, in particular to a high-voltage isolation transformer. The transformer comprises an insulation box body and a coil packaged in the insulation box body, the input end and the output end of the coil extend out of the insulation box body, the output end of the coil is connected with a binding post, the binding post is wrapped in an insulation base column which is integrally connected with the insulation box body in an insulation mode, and the insulation base column is connected with the insulation box body in an insulation mode. The top end of the insulating base column is exposed out of the insulating base column so as to be externally connected with other electric equipment; at least one insulating cylinder is installed on the outer surface of the insulating box body, the insulating cylinder is arranged on the outer side of the insulating base column in a sleeving mode, and the insulating cylinder and the insulating box body are integrally connected in an insulating mode. According to the utility model, the creepage distance can be effectively increased through the design of the insulating cylinder under the condition that the length of the insulating base column is not increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer insulation technical field, concretely is a high voltage isolation transformer. BACKGROUND

[0002] The creepage distance between the input end and the output end of the transformer is an important parameter to ensure the safe operation and good insulation performance of the transformer equipment, and when the creepage distance of the transformer does not meet the standard, it may cause electrical faults, short circuits, fires and other safety hazards. Therefore, the creepage distance of the transformer is crucial to the safe use of the transformer.

[0003] At present, in order to ensure that the creepage distance of the transformer meets the standard, the input end and the output end of the transformer are usually kept away from each other, and the input end and the output end are wrapped with insulation material to further increase the creepage distance. A transformer is disclosed in patent CN205487706U, the input end and the output end of which are away from each other and are both connected with a terminal post, and the outside of the terminal post is sleeved with a cylindrical insulation column to increase the creepage distance. Based on the arrangement of the terminal post, although the creepage distance can be increased by the cylindrical insulation column, since the surface of the insulation column is relatively flat, when it is necessary to further increase the creepage distance, the length of the insulation column needs to be lengthened, and the longer length will increase the volume of the transformer, which is not conducive to transportation and installation.

[0004] Therefore, the current cylindrical terminal post needs to be further improved in terms of increasing the creepage distance. UTILITY MODEL CONTENTS

[0005] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a high voltage isolation transformer. The utility model can effectively increase the creepage distance without increasing the length of the insulation base column.

[0006] To achieve the above purpose, the utility model provides the following technical scheme:

[0007] A high voltage isolation transformer, characterized in that it comprises an insulation box body and a coil encapsulated in the insulation box body, the input end and the output end of the coil extending out of the insulation box body, the output end of the coil being connected with a terminal post, the terminal post being wrapped in an insulation base column which is integrally and insulatively connected with the insulation box body, and the top end of the terminal post being exposed outside the insulation base column to facilitate external connection of an electrical equipment; at least one insulation cylinder is installed on the outer surface of the insulation box body, the insulation cylinder being sleeved outside the insulation base column, and the insulation cylinder being integrally and insulatively connected with the insulation box body.

[0008] As a further scheme of the utility model: the outer surface of the insulating box body is provided with at least two insulating barrels, each insulating barrel is sequentially and spacedly sleeved along the radial direction of the insulating base column, and the insulating barrel extends along the axial direction of the insulating base column.

[0009] As a further scheme of the utility model: along the radial direction of the insulating base column, the length of the insulating barrel located at the outer side in the axial direction of the insulating base column is greater than the length of the insulating barrel located at the inner side; and / or the length dimension of the insulating barrel along the axial direction of the insulating base column ranges from 15mm to 30mm, and the thickness dimension of the insulating barrel ranges from 10mm to 50mm.

[0010] As a further scheme of the utility model: the outer surface of the insulating base column is sleeved with a plurality of insulating convex discs which are sequentially and spacedly arranged along the axial direction of the insulating base column.

[0011] As a further scheme of the utility model: the thickness of each convex disc gradually thins from inside to outside along the radial direction of the insulating base column; and / or the convex disc comprises four convex discs which are spacedly arranged along the axial direction of the insulating base column.

[0012] As a further scheme of the utility model: an insulating sleeve in the shape of a bowl is integrally and coaxially sleeved and mounted on the outer surface of the top of the insulating base column, and the top end of the terminal post is located in the sleeve cavity of the insulating sleeve.

[0013] As a further scheme of the utility model: the insulating sleeve comprises a barrel bottom and a barrel wall which are connected to form the sleeve cavity, the barrel bottom is connected to the outer surface of the insulating base column and located below the terminal post, and the barrel wall is configured to extend from the outer edge of the barrel bottom along the axial direction of the insulating base column and beyond the top end of the terminal post by a predetermined distance.

[0014] As a further scheme of the utility model: the size of the barrel bottom is greater than the size of the convex disc; and / or the thickness of the barrel wall gradually decreases along the axial direction of the insulating base column.

[0015] As a further scheme of the utility model: an equalizing ring is integrally and coaxially mounted on the top end surface of the insulating base column, and the equalizing ring is sleeved outside the top end of the terminal post.

[0016] As a further scheme of the utility model: a dust cover is arranged outside the insulating base column, the dust cover is integrally and insulatively connected with the outer surface of the insulating box body, and a threading hole for threading is formed in the top of the dust cover.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. The utility model discloses a design one insulation box body to package the transformer coil, effectively improved the security and reliability of transformer. The input and output of transformer coil extend the box body, and it is convenient to connect. Especially, the two wire posts of output connection are arranged side by side and are wrapped in the insulation base column of integral connection with insulation box body, and the insulation performance of wiring place is enhanced, and the cylindrical wave insulation surface on the insulation base column increases the creepage distance between the output and input in the limited space, and then realizes the effective isolation of input and wire post top end, greatly reduces the risk of short circuit or electric shock under high voltage environment, improves the security of use.

[0019] 2. The gradually thinning design from inside to outside of the convex disc makes the wave shape of the outer surface of the insulation base column more smoothly transitioned, which helps to reduce the possibility of electric field concentration and partial discharge, and further improves the insulation performance and stability of the transformer. At the same time, this design also facilitates more efficient insulation isolation in limited space.

[0020] 3. A plurality of insulation cylinders coaxially arranged with the insulation base column are installed on the outer surface of the insulation box body, and these insulation cylinders are integrally connected with the insulation box body, further enhancing the overall insulation performance of the transformer. The spacer sleeve design of the insulation cylinder not only increases the insulation level, but also disperses the electric field strength through the multi-layer insulation structure, improving the voltage resistance and safety of the transformer.

[0021] 4. The installation of the insulation sleeve provides additional insulation protection for the top end of the wire post, and the bowl-shaped design can effectively shield and disperse possible electric arcs or discharges, further improving the safety and reliability of the transformer. At the same time, the integrated design of the insulation sleeve and the insulation base column also simplifies the installation and maintenance process.

[0022] 5. The design of the wire post top end located in the insulation sleeve cavity ensures that the wire post can still maintain good insulation state when connecting external equipment, avoiding short circuit or electric shock accidents caused by improper wiring operation, improving the safety of operation. The insulation sleeve is located above the convex disc at the uppermost end of the insulation base column, which makes the insulation sleeve more effectively shield and disperse electric arcs and discharges from above or side, providing more comprehensive insulation protection for the wire post and transformer coil.

[0023] 6. The installation of the grading ring helps to balance the electric field distribution at the top end of the wire post, reducing the possibility of electric field concentration and partial discharge, thereby improving the stability and life of the transformer. At the same time, the grading ring is sleeved outside the top end of the two wire posts, which also enhances the insulation performance between the wire posts.

[0024] 7. The dust cover design provides an extra layer of protection for the transformer, effectively preventing dust, moisture, and other impurities from entering the transformer's interior and extending its service life. The dust cover is integrated with the insulating housing, ensuring its stability and airtightness, while the wiring hole design facilitates wiring and connection to external equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0026] Figure 2 This is a schematic diagram of the external structure of this utility model.

[0027] Figure 3 This is a schematic diagram of the structure at the top of the terminal block in this utility model.

[0028] In the diagram: 1. Insulating housing; 11. Input terminal; 12. Terminal block; 2. Insulating base; 3. Raised disc; 4. Insulating cylinder; 5. Insulating sleeve; 6. Equalizing ring; 7. Dust cover. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-3 In this embodiment of the invention, a high-voltage isolation transformer includes a cubic insulating housing 1 made of epoxy resin, thus possessing excellent insulation performance. A transformer coil is also installed inside the insulating housing 1, with its input terminal 11 and output terminal located on different outer surfaces of the insulating housing 1. Figure 1 and Figure 2 As shown, a preferred solution is to place the input terminal 11 and the output terminal on adjacent housing surfaces, which facilitates installation and maintenance and conforms to the conventional shape design of transformers.

[0031] The output terminal of the transformer coil is located at the top of the insulating housing 1, and two vertically arranged metal terminals 12 are connected to it. The terminals 12 are surrounded by an insulating base 2, and the two terminals 12 are symmetrically distributed within the insulating base 2 about the axis of the insulating base 2. The insulating base 2 is made of epoxy resin, and the distance between the outer surfaces of the terminals 12 and the insulating base 2 is between 10 and 50 mm.

[0032] Since the insulating base column 2 and the insulating box 1 are both made of epoxy resin, they can be connected together by using additional epoxy resin during production to form an integrated insulating structure.

[0033] A protruding disc 3 is sleeved on the outer surface of the insulating base column 2. The protruding disc 3 can be coaxially arranged with the insulating base column 2 or eccentrically arranged. As shown in Figure 1 , the coaxial arrangement is preferred, and the radius of the protruding disc 3 is 10-50 mm.

[0034] Each protruding disc 3 is arranged at equal intervals along the axial direction of the insulating base column 2. As shown in Figure 2 , four protruding discs 3 are preferably arranged. Of course, the spacing between adjacent protruding discs 3 and the number of protruding discs 3 can be adjusted according to actual needs. The protruding disc 3 is made of epoxy resin, so it can be connected to the insulating base column 2 during production by using additional epoxy resin to form an integrated insulating structure. As shown in Figure 1 , the axial symmetry shape of the insulating base column 2 and the protruding disc 3 after cooperation can be set on the outside of the terminal post 12 using a corresponding pouring mold, and an epoxy resin integrated casting is used to improve the connection stability of the insulating base column 2 and the protruding disc 3.

[0035] The thickness of the protruding disc 3 gradually thins out from the inside to the outside along the radial direction, and its surface is smooth without edges and burrs. As can be seen from Figure 1 and Figure 2 , the radial edge part of the protruding disc 3 is designed as a smooth surface to reduce the accumulation of electric charge at sharp parts and avoid sharp end discharge phenomenon, ensuring the safe and stable operation of the high-voltage isolation transformer.

[0036] A plurality of insulating sleeves 4 are installed on the upper surface of the insulating box 1 and are sleeved on the outside of the insulating base column 2. The insulating sleeve 4 can be coaxially sleeved with the insulating base column 2 or eccentrically sleeved. As shown in Figure 1 and Figure 2 , the insulating sleeve 4 is coaxially sleeved with the insulating base column 2. The height of each insulating sleeve 5 increases from the inside to the outside, and the inner diameter of the innermost insulating sleeve 5 is greater than the diameter of the protruding disc 3, so that the protruding disc 3 and the insulating sleeve 5 do not contact each other. The height of the insulating sleeve 5 is 15-130 mm, and the thickness is 10-50 mm.

[0037] A bowl-shaped insulating sleeve 5 is integrally and coaxially sleeved and installed on the outer surface of the top of the insulating base column 2, and the insulating sleeve 5 is also made of epoxy resin. The top end of the terminal post 12 is also located in the sleeve cavity of the insulating sleeve 5, and the sleeve opening of the insulating sleeve 5 is at least 20 mm higher than the top end of the terminal post 12 to further improve the creepage distance.

[0038] A voltage equalizing ring 6 is coaxially sleeved on the top surface of the insulating base column 2 and outside the terminal post 12. The surface of the voltage equalizing ring 6 is smooth and coaxially arranged with the insulating base column 2, so as to prevent discharge or damage caused by local overvoltage.

[0039] A dust cover 7 is coaxially sleeved outside the insulating base column 2 and integrally connected with the insulating box 1. The dust cover 7 can effectively prevent impurities such as dust and moisture from entering the inside of the transformer, thereby prolonging the service life of the transformer.

[0040] The movement of the current from the input end 11 to the top end of the terminal post 12: the current starts from the input end 11, moves along the surface of the insulating box 1 to the outermost insulating cylinder 4. Then, the current is discharged to the top end of the insulating cylinder 4, moves along the inner wall surface of the insulating cylinder 4 to the bottom of the insulating cylinder 4, and moves along the upper surface of the insulating box 1 to the next one inside. Then, the current climbs over each insulating cylinder 4 in the same way of "climbing over mountains and ridges" to the root of the insulating base column 2. Then, the current climbs over each protruding disc 3 and insulating sleeve 5 in the same way of "climbing over mountains and ridges", and finally reaches the top end of the terminal post 12. As can be seen, the whole creeping distance of the current is long, thereby improving the use safety of the transformer.

Claims

1. A high-voltage isolation transformer, characterized by The application relates to an insulation box (1) and a coil packaged in the insulation box (1), wherein the input end (11) and the output end of the coil extend out of the insulation box (1), the output end of the coil is connected with a terminal post (12), the terminal post (12) is wrapped in an insulation base post (2) which is integrally and insulatively connected with the insulation box (1), and the top end of the terminal post (12) is exposed outside the insulation base post (2) to facilitate external connection of an electrical device; at least one insulation cylinder (4) is mounted on the outer surface of the insulation box (1), the insulation cylinder (4) is sleeved outside the insulation base post (2), and the insulation cylinder (4) is integrally and insulatively connected with the insulation box (1).

2. A high-voltage isolation transformer according to claim 1, characterized in that At least two insulation cylinders (4) are mounted on the outer surface of the insulation box (1), each of the insulation cylinders (4) is sequentially and spacedly sleeved along the radial direction of the insulation base post (2), and the insulation cylinder (4) extends along the axial direction of the insulation base post (2).

3. A high-voltage isolation transformer according to claim 2, characterized in that In the radial direction of the insulation base post (2), the length of the insulation cylinder (4) located on the outside in the axial direction of the insulation base post (2) is greater than the length of the insulation cylinder (4) located on the inside; and / or the length of the insulation cylinder (4) along the axial direction of the insulation base post (2) ranges from 15 mm to 30 mm, and the thickness of the insulation cylinder (4) ranges from 10 mm to 50 mm.

4. A high-voltage isolation transformer according to any one of claims 1 to 3, characterized in that A plurality of insulating convex discs (3) are sequentially and spacedly arranged along the axial direction of the insulation base post (2) and sleeved on the outer surface of the insulation base post (2).

5. A high-voltage isolation transformer according to claim 4, characterized in that The thickness of each of the convex discs (3) gradually decreases from inside to outside along the radial direction of the insulation base post (2); and / or the convex discs (3) are arranged in four along the axial direction of the insulation base post (2).

6. A high-voltage isolation transformer according to claim 4, characterized in that An insulating sleeve (5) in the shape of a bowl is integrally and insulatively coaxially sleeved and mounted on the outer surface of the top of the insulation base post (2), and the top end of the terminal post (12) is located in the sleeve cavity of the insulating sleeve (5).

7. A high-voltage isolation transformer according to claim 6, characterized in that The insulating sleeve (5) comprises a cylinder bottom and a cylinder wall which are connected to form the sleeve cavity, the cylinder bottom is connected to the outer surface of the insulation base post (2) and is located below the terminal post (12), and the cylinder wall is configured to extend from the outer edge of the cylinder bottom along the axial direction of the insulation base post (2) and beyond the top end of the terminal post (12) by a predetermined distance.

8. A high-voltage isolation transformer according to claim 7, characterized in that The size of the cylinder bottom is greater than that of the convex disc (3); and / or the thickness of the cylinder wall gradually decreases along the axial direction of the insulation base post (2).

9. A high-voltage isolation transformer according to claim 1, characterized in that An equalizing ring (6) is integrally and insulatively coaxially mounted on the top end surface of the insulation base post (2), and the equalizing ring (6) is sleeved outside the top end of the terminal post (12).

10. A high-voltage isolation transformer according to claim 1, characterized in that A dust cover (7) is arranged outside the insulation base post (2), the dust cover (7) is integrally and insulatively connected with the outer surface of the insulation box (1), and a threading hole is formed in the top of the dust cover (7) for threading.

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