Insulation cushion block assembly for dry-type transformer

Abstract

The utility model discloses an insulating cushion block assembly for a dry-type transformer. The utility model aims to solve the problems that in the prior art, the pressure applied by a metal pressing plate to a cushion block main body is large, the cushion block main body is easy to damage, a pressing nail bolt can abrade the inner wall of a pressing nail limiting groove, and the like. According to the technical scheme, the cushion block comprises an epoxy resin cushion block main body and a metal pressing plate, a pressing nail limiting groove is formed in the top face of the cushion block, and the pressing nail bolt is connected with a clamping piece of the dry-type transformer through the nut, and is characterized in that the top face of the metal pressing plate is flush with the top face of the epoxy resin cushion block main body, and the pressing nail limiting groove is formed in the metal pressing plate; the lower bottom of the nail pressing bolt is provided with a cylindrical section with the reduced diameter, the outer wall of the cylindrical section is smooth, the diameter of the cylindrical section is equal to the width of the nail pressing limiting groove, the height of the cylindrical section is smaller than the depth of the nail pressing limiting groove, and the cylindrical section of the nail pressing bolt is arranged in the nail pressing limiting groove in a sliding fit mode. The part, outside the cylindrical section, of the bottom face of the pressing nail bolt abuts against the top face of the metal pressing plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the spare part of dry -type transformer for power supply especially insulating pad block subassembly for dry -type transformer. BACKGROUND

[0002] Dry -type transformer for power supply is a kind of transformer type not relying on oil as cooling and insulating medium, its structure includes clamp, iron core, high voltage winding, low voltage winding, insulating cylinder and insulating pad block subassembly, wherein the clamp is transversely clamped to the iron core, and the high voltage winding and low voltage winding are vertically compressed by the insulating pad block subassembly, the insulating cylinder is arranged between the high voltage winding and low voltage winding as insulating partition, the insulating pad block subassembly is composed of insulating pad, press-in bolt on the insulating pad and nut on the press-in bolt.

[0003] The insulating pad block subassembly of proximity structure, as described in the main pad of a kind of dry -type transformer main insulation structure and dry -type transformer with it disclosed in Chinese patent No. CN215118602U, the structure is that the top of the main pad is inwardly recessed into press-in limiting groove, the groove bottom of the press-in limiting groove is fixed with metal pressing plate, the metal pressing plate is compressed by the press-in bolt on the clamp, the main pad can include pad baffle, is clamped at the bottom end of the main pad, the bottom of the pad baffle is structured with the clamping table that enters the gap between the high voltage winding and the low voltage winding, and the clamping groove for limiting the insulating cylinder is arranged on the clamping table, and the clamping groove is inwardly deepened into the pad baffle along the clamping table.This scheme has the following disadvantages: first, the metal pressing plate is arranged at the groove bottom of press-in limiting groove, the total area is small, and the unit area pressure applied by the press-in bolt to the main pad through the metal pressing plate is large, which can easily cause damage to the main pad;Second, when the lower part of the press-in bolt moves in the press-in limiting groove, the outer thread of the press-in bolt can wear the inner wall of the press-in limiting groove with epoxy resin texture, so that the limiting effect of the limiting groove is not good, and the firmness of the overall structure of the dry -type transformer is affected. UTILITY MODEL CONTENTS

[0004] In order to overcome the problems of the prior art, such as the unit area pressure applied by the metal pressing plate to the main pad is large, which can easily cause damage to the main pad, and the press-in bolt can wear the inner wall of the press-in limiting groove, so that the limiting effect of the press-in limiting groove is not good, the purpose of the utility model is to provide an insulating pad block subassembly for dry -type transformer, which can overcome the defects of the prior art.

[0005] The utility model discloses a technical scheme that solves its technical problem is adopted: a kind of insulating pad block assembly for dry-type transformer, including pad block, the press nail bolt being pressed on the pad block and the nut being screwed on the press nail bolt, the pad block includes epoxy pad block main body and the metal pressing plate being consolidated on the epoxy pad block main body, the top surface of the pad block is equipped with the press nail limiting slot being cooperated with the press nail bolt, the press nail bolt is connected the clamp piece of the dry-type transformer by nut and is fastened with the clamp piece, it is characterized by: the top surface of the metal pressing plate is flush with the top surface of the epoxy pad block main body, the press nail limiting slot is opened in metal pressing plate, the width of the press nail limiting slot is less than the outer diameter of the press nail bolt, the lower bottom of the press nail bolt is equipped with a reduced diameter cylindrical section, the outer wall of the cylindrical section is smooth, and its diameter is equivalent to the width of the press nail limiting slot, the height of the cylindrical section is less than the depth of the press nail limiting slot, the cylindrical section of the press nail bolt is slidingly fitted in the press nail limiting slot, and the part of the bottom surface of the press nail bolt outside the cylindrical section is pressed on the top surface of the metal pressing plate.

[0006] The cylindrical section of the above technical solution can be a same-body cylindrical section formed by reducing the diameter of the lower part of the press nail bolt, or a connecting cylindrical section formed by fastening the bottom surface of the press nail bolt.

[0007] The outer diameter of the press nail bolt of the above technical solution can be 12-16mm, the outer diameter of the cylindrical section can be 6-8mm, and the thickness of the metal pressing plate can be 4-6mm.

[0008] The bottom surface of the epoxy pad block main body of the above technical solution can be fastened with a silica gel pad layer, and the silica gel pad layer can be fastened and attached to the bottom surface of the epoxy pad block main body by adhesive method.

[0009] The silica gel pad layer of the above technical solution can extend downward from its bottom surface to have a positioning foot one and a positioning foot two, wherein the thickness of the positioning foot one can be greater than or equal to the gap width between the low-voltage winding and the insulation cylinder on the dry-type transformer, the thickness of the positioning foot two can be greater than or equal to the gap width between the high-voltage winding and the insulation cylinder on the dry-type transformer, the groove width between the positioning foot one and the positioning foot two is equivalent to the thickness of the insulation cylinder on the dry-type transformer, and the groove extends upward into the silica gel pad layer to adapt to the structure that the top side of the insulation cylinder is higher than the top side of the low-voltage winding and the high-voltage winding.

[0010] The metal pressing plate of the above technical solution can be placed in the epoxy pad block main body and consolidated on the epoxy pad block main body while pouring the epoxy pad block main body.

[0011] The utility model discloses a beneficial effect is: first, because the top surface of metal pressure plate is flush with the top surface of epoxy resin cushion block main part, the width of pressure nail limiting slot is less than the outer diameter of pressure nail bolt, the part of pressure nail bolt bottom surface on the outside of the cylindrical section is pressed on the top surface of metal pressure plate, so that the metal pressure plate is not limited by the pressure nail limiting slot, and the metal pressure plate of large area size can be used freely, and the pressure nail bolt is pressed on the top surface of metal pressure plate, so the unit area pressure that pressure nail bolt exerts to the epoxy resin cushion block main part through the metal pressure plate is smaller, and the epoxy resin cushion block main part is not easy to be damaged, and the durability of cushion block can be effectively improved.

[0012] The utility model will be further described below in connection with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a top view schematic diagram of an embodiment of the utility model used on dry-type transformer, and the clamp of dry-type transformer is omitted in the drawing.

[0014] Figure 2 It is Figure 1 The main view section view amplification schematic diagram of an insulation cushion block subassembly in it.

[0015] Figure 3 It is Figure 2 The three-dimensional schematic diagram of it, and the clamp is removed in the drawing.

[0016] In the drawing: 1, cushion block;2, pressure nail bolt;3, nut;4, epoxy resin cushion block main part;5, metal pressure plate;6, pressure nail limiting slot;7, clamp;8, cylindrical section;9, the part of pressure nail bolt bottom surface on the outside of cylindrical section;10, silica gel cushion layer;11, positioning foot one;12, positioning foot two;13, dry-type transformer;14, low voltage winding;15, insulation cylinder;16, gap one;17, high voltage winding;18, gap two;19, groove;20, transformer core. DETAILED DESCRIPTION

[0017] Refer to Figures 1 to 3The insulating pad assembly for dry-type transformer comprises a pad 1, a press pin bolt 2 pressed on the pad 1, and a nut 3 screwed on the press pin bolt 2, the pad 1 comprises an epoxy pad body 4 and a metal pressing plate 5 fixed on the epoxy pad body 4, the top surface of the pad 1 is provided with a press pin limiting groove 6 matched with the press pin bolt 2, the press pin bolt 2 is connected with a clamp 7 of the dry-type transformer through the nut 3 and is fastened with the clamp 7, characterized in that the top surface of the metal pressing plate 5 is flush with the top surface of the epoxy pad body 4, the press pin limiting groove 6 is arranged on the metal pressing plate 5, the width of the press pin limiting groove 6 is less than the outer diameter of the press pin bolt 2, the lower bottom of the press pin bolt 2 is provided with a reduced-diameter cylindrical section 8, the outer wall of the cylindrical section 8 is smooth and the diameter of the cylindrical section 8 is equivalent to the width of the press pin limiting groove 6, the height of the cylindrical section 8 is less than the depth of the press pin limiting groove 6, the cylindrical section 8 of the press pin bolt 2 is slidingly matched in the press pin limiting groove 6, and the part 9 of the bottom surface of the press pin bolt 2 outside the cylindrical section 8 is pressed on the top surface of the metal pressing plate 5.

[0018] In addition, the cylindrical section 8 is a cylindrical section formed by reducing the diameter of the lower part of the press pin bolt 2 and is integral with the press pin bolt 2.

[0019] The outer diameter of the press pin bolt 2 is 12-16 mm, the outer diameter of the cylindrical section 8 is 6-8 mm, and the thickness of the metal pressing plate 5 is 4-6 mm.

[0020] The bottom surface of the epoxy pad body 4 is fastened with a silica gel pad layer 10, and the silica gel pad layer 10 is fastened and attached to the bottom surface of the epoxy pad body 4 by adhesive method.

[0021] The silica gel pad layer 10 extends downward from the bottom surface and has a positioning foot one 11 and a positioning foot two 12, wherein the thickness of the positioning foot one 11 is slightly greater than or equal to the width of a gap one 16 between a low-voltage winding 14 and an insulating cylinder 15 on a dry-type transformer 13, the thickness of the positioning foot two 12 is slightly greater than or equal to the width of a gap two 18 between a high-voltage winding 17 and the insulating cylinder 15 on the dry-type transformer 13, the width of a groove 19 between the positioning foot one 11 and the positioning foot two 12 is equivalent to the thickness of the insulating cylinder 15 on the dry-type transformer 13, and the groove 19 extends upward into the silica gel pad layer 10 to adapt to the structure that the top side of the insulating cylinder 15 is higher than the top sides of the low-voltage winding 14 and the high-voltage winding 17. Figure 1 The central part of the dry-type transformer 13 is a transformer core 20.

[0022] The metal pressing plate 5 is put into the epoxy resin pad body 4 and fixed on the epoxy resin pad body 4 at the same time of casting the epoxy resin pad body 4.

[0023] When installed, as shown in Figure 1 four said pads 1 are respectively arranged on four corners of the top side of the low-voltage winding 14 and the high-voltage winding 17 of the dry-type transformer 13, each said pad 1 is fitted into the top of the insulating cylinder 15 by the said groove 19, and the said positioning foot one 11 is fitted into the gap one 16 between the low-voltage winding 14 and the insulating cylinder 15, and the said positioning foot two 12 is fitted into the gap two 18 between the high-voltage winding 17 and the insulating cylinder 15, then the said pad 1 is in contact with the top side of the low-voltage winding 14 and the high-voltage winding 17, so that the said pad 1 is positioned; then as shown in Figure 2 the pressing screw bolt 2 is connected to the clamp 7 which has previously clamped the transformer core 20 on the dry-type transformer 13 through the nut 3 on the pressing screw bolt 2, and the cylindrical section 8 of the pressing screw bolt 2 is slidingly fitted into the pressing screw limiting groove 6 on the metal pressing plate 5, and the part 9 on the bottom surface of the pressing screw bolt 2 outside the cylindrical section 8 is in abutment with the top surface of the metal pressing plate 5; after the nut 3 on the pressing screw bolt 2 is adjusted to be in a suitable position by rotation, the clamp 7 on the dry-type transformer 13 is pressed against the low-voltage winding 14, the high-voltage winding 17 and the insulating cylinder 15 of the dry-type transformer 13 through the pressing screw bolt 2 and the pad 1, so that the overall structure of the dry-type transformer is firm.

Claims

1. An insulating pad assembly for a dry-type transformer, comprising a pad, a pressure bolt pressing against the pad, and a nut threaded onto the pressure bolt, wherein the pad comprises an epoxy resin pad body and a metal pressure plate fixed to the epoxy resin pad body, the top surface of the pad is provided with a pressure bolt limiting groove that mates with the pressure bolt, and the pressure bolt is connected to and fastened to the clamp of the dry-type transformer via the nut, characterized in that: The top surface of the metal pressing plate is flush with the top surface of the epoxy pad body, the pressing pin limiting groove is arranged on the metal pressing plate, the width of the pressing pin limiting groove is less than the outer diameter of the pressing pin bolt, the lower bottom of the pressing pin bolt is provided with a reduced diameter cylindrical segment, the outer wall of the cylindrical segment is smooth and the diameter of the cylindrical segment is equivalent to the width of the pressing pin limiting groove, the height of the cylindrical segment is less than the depth of the pressing pin limiting groove, the cylindrical segment of the pressing pin bolt is slidingly fitted in the pressing pin limiting groove, and the part of the bottom surface of the pressing pin bolt outside the cylindrical segment is pressed on the top surface of the metal pressing plate.

2. The insulating spacer assembly for a dry-type transformer of claim 1, wherein: The cylindrical segment is a self-cylindrical segment formed by reducing the diameter of the lower part of the pressing pin bolt, or a connecting cylindrical segment connected to the bottom surface of the pressing pin bolt.

3. The insulating spacer assembly for a dry-type transformer according to claim 1 or 2, characterized in that: The outer diameter of the pressing pin bolt is 12-16mm, the outer diameter of the cylindrical segment is 6-8mm, and the thickness of the metal pressing plate is 4-6mm.

4. The insulating spacer assembly for a dry-type transformer according to claim 1 or 2, characterized in that: The bottom surface of the epoxy pad body is fastened with a silica gel pad layer, and the silica gel pad layer is fastened and attached to the bottom surface of the epoxy pad body by adhesion.

5. The insulating spacer assembly for a dry-type transformer of claim 4, wherein: The silica gel pad layer extends downward from the bottom surface and has a positioning foot one and a positioning foot two, wherein the thickness of the positioning foot one is greater than or equal to the gap width between the low-voltage winding and the insulation cylinder on the dry-type transformer, the thickness of the positioning foot two is greater than or equal to the gap width between the high-voltage winding and the insulation cylinder on the dry-type transformer, the groove width between the positioning foot one and the positioning foot two is equivalent to the thickness of the insulation cylinder on the dry-type transformer, and the groove extends upward into the silica gel pad layer to adapt to the structure that the top side of the insulation cylinder is higher than the top side of the low-voltage winding and the high-voltage winding.

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