Insulation end ring for oil-immersed transformer

Abstract

The insulating end ring for the oil-immersed transformer comprises an insulating ring and insulating cushion blocks, the insulating cushion blocks are annularly arranged at the bottom of the insulating ring at equal intervals, cambered surface clamping grooves are formed in the middles of the surfaces of an inner side arc and an outer side arc of the insulating ring, the cambered surface clamping grooves are annular rectangular grooves, and the insulating cushion blocks are arranged in the cambered surface clamping grooves. Insulation cushion blocks are arranged below the two sides of the outer portions of the cambered surface clamping grooves of the inner side arc and the outer side arc, a guide slope is arranged at the bottom of an inner hole of the insulation ring, one side of the guide slope is connected with the bottom faces of the cambered surface clamping grooves, the insulation cushion blocks are arranged on the outer side of the guide slope, and the insulation cushion blocks are rectangular blocks. The insulation cushion block which originally needs to be glued is fixedly connected in a clamping mode, installation is convenient, meanwhile, the machining process can be simplified to the maximum degree, the insulation ring and the insulation cushion block are produced only through turning and planing which are simple and can be matched with the large size, and the production efficiency is improved. And the size precision required by a produced product can be ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformer insulating end rings, and specifically relates to an insulating end ring for an oil-immersed transformer. Background Art

[0002] The insulating end ring used for the insulation of the oil-immersed transformer body mainly plays the role of mechanical support, fixation and oil circulation and heat dissipation. The insulating end ring includes an insulating ring and an insulating pad. The overall thickness of the insulating end ring is t=t1+t2. The shape of the insulating ring is annular, and the thickness is t1. It is the skeleton of the insulating end ring; the insulating pad ( Figure 1-2 ) is rectangular in shape, with a thickness of t2, and is bonded to the surface of the insulating ring at equal intervals along the circumference of the insulating ring. The insulating pads are bonded with electrical latex glue or phenolic resin. Due to the use of a bonding structure, if the bonding process is not standardized or under external force (such as transformer short-circuit force), the insulating pads will be displaced or even fall off, and the insulating end ring will lose its mechanical support, resulting in the failure of the transformer's mechanical strength and transformer failure.

[0003] Since the outside of the transformer needs to be wound with coils, annular equidistant insulating pads must be set at the bottom of the insulating end ring to facilitate the winding, fixing and oil circulation of the wound coils from the bottom to dissipate heat.

[0004] In order to ensure that the insulating pad at the bottom of the insulating end ring does not move and to ensure the consistency of the height and flatness of the entire insulating end ring, an integrated blank is directly used and a one-time milling process is performed by a machining center to complete the production of the integrated insulating end ring.

[0005] However, the machining center required for milling such large parts is also very large, which results in a very high machining cost for the insulating end ring which is only used for support and fixing. Utility Model Content

[0006] In order to solve the above problems, this paper proposes an insulating end ring for an oil-immersed transformer, the insulating end ring includes an insulating ring and an insulating pad, a plurality of insulating pads are arranged at equal intervals in a ring at the bottom of the insulating ring, an arc surface groove is arranged in the middle of the surface of the inner arc and the outer arc of the insulating ring, the arc surface groove is an annular rectangular groove, insulating pads are arranged below the outer sides of the arc surface groove of the inner arc and the outer arc, a guide slope is arranged at the bottom of the inner hole of the insulating ring, one side of the guide slope is connected to the bottom surface of the arc surface groove, an insulating pad is arranged on the outside of the guide slope, and the insulating pad The shape is a rectangular block, and fixing hooks are provided above both ends of the insulating spacer block. A fitting inner slope is provided on the inner side of the fixing hook at one end of the insulating spacer block. The fixing hook is connected to the arc surface slot by clamping, and the connecting edge of the guide slope and the arc surface slot is provided with an arc chamfer. By using the clamping form, the insulating spacer block that originally required gluing is clamped and fixedly connected, which is convenient for installation and can simplify the processing flow to the greatest extent. Only two simple processing forms that can be adapted to large volumes, namely turning and planing, are used to produce insulating rings and insulating spacers, which can ensure the required dimensional accuracy of the produced products.

[0007] The insulating ring is in the shape of a turned annular plate, with a concentric hole in the center, the upper and lower outer surfaces of the insulating ring being parallel to each other, and the middle of the inner arc and the outer arc of the insulating ring being horizontally and flushly provided with arc surface grooves. Turning is used to process the flatness and parallelism of the surfaces on both sides of the insulating ring, and then a turning chamfering cutter and a turning groove cutter are used to achieve a stable and efficient turning effect, so that the one-time processing of the insulating ring can be completed at the same time.

[0008] The arc surface slot is a ring-shaped rectangular slot, and the inner and outer arc surface slots have the same shape. The distance between the upper surface of the arc surface slot and the bottom surface of the insulating ring is the same as the distance between the upper surface of the fixed hook and the upper surface of the insulating pad. The arc surface slots are arranged on both sides inside and outside, so as to realize the clamping of the insulating pad and ensure the firm placement and detachment of the installation.

[0009] The guide slope is a machined guide slope, the upper vertical height of the guide slope is smaller than the lateral vertical height of the lower side of the guide slope, and a circular chamfer is provided at the connecting edge between the upper side of the guide slope and the lower surface of the arc groove. The guide slope is used to facilitate the insertion of the insulating pad during installation, and the insulating pad can slide along the guide slope into the inner arc groove.

[0010] The insulating gasket is in the shape of a planed rectangular block, and fixed hooks are planed on the upper parts of both ends of the insulating gasket. The inner spacing of the fixed hooks at both ends is the same as the spacing between the outer arc edge and the inner arc edge of the insulating ring. The fixed hook is in the shape of a right-angle hook, and the fixed hook is an integrated planed hook. The cross-sectional shape of the fixed hook is the same as the cross-sectional shape of the arc groove. Insulating gaskets with composite standards can be produced quickly and in batches through planing, and the stability of the insulating gasket after being connected can be guaranteed to prevent it from falling out.

[0011] Beneficial effects:

[0012] By using a clip-on method, the insulating spacers that originally required gluing can be clipped and fixed together, which facilitates installation and simplifies the processing process to the greatest extent. Only two simple processing methods that can be adapted to large volumes, turning and planing, are used to produce insulating rings and insulating spacers, which can ensure the required dimensional accuracy of the products produced.

[0013] By using turning to process the flatness and parallelism of the surfaces on both sides of the insulating ring, and then using turning chamfering cutters and turning groove cutters to achieve a stable and efficient turning effect, the insulating ring can be processed in one go.

[0014] The guide slope is used to facilitate the insertion of the insulating spacer during installation, and the insulating spacer can slide along the guide slope into the inner arc-surface slot.

[0015] The arc-surface slots provided on the inner and outer sides can realize the clamping of the insulating spacer, ensuring the firm placement and detachment of the installation.

[0016] Insulating spacers with composite standards can be produced quickly and in batches by planing, and the stability of the insulating spacers after being snapped in can be ensured to prevent them from falling out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an insulating end ring for an oil-immersed transformer;

[0018] Figure 2 It is a cross-sectional view of an insulating end ring for an oil-immersed transformer;

[0019] In the figure; 1, insulating ring, 11, arc groove, 12, guide slope, 2, insulating spacer, 21, fixing hook, 22, fitting inner slope. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0021] Insulating ring 1, arc surface groove 11, guide slope 12, insulating spacer 2, fixing hook 21, fitting inner slope 22.

[0022] like Figure 1 , 2 As shown;

[0023] An insulating end ring for an oil-immersed transformer, the insulating end ring comprises an insulating ring 1 and an insulating pad 2, a plurality of insulating pads 2 are provided at an equal distance in an annular manner at the bottom of the insulating ring 1, an arc surface groove 11 is provided at the middle of the inner arc and the outer arc of the insulating ring 1, the arc surface groove 11 is an annular rectangular groove, insulating pads 2 are provided at the lower sides of the outer sides of the arc surface groove 11 of the inner arc and the outer arc, a guide slope 12 is provided at the bottom of the inner hole of the insulating ring 1, one side of the guide slope 12 is connected to the inner hole of the insulating ring 1, and the guide slope 12 is provided at the lower sides of the inner hole of the insulating ring 1. The bottom surface of the arc surface slot 11 is connected, and an insulating pad 2 is provided on the outside of the guide slope 12. The insulating pad 2 is in the shape of a rectangular block, and a fixed hook 21 is provided above both ends of the insulating pad 2. The inner side of the fixed hook 21 at one end of the insulating pad 2 is provided with a fitting inner slope 22. The fixed hook 21 is connected to the arc surface slot 11 by clamping, and the connecting edge of the guide slope 12 and the arc surface slot 11 is provided with an arc chamfer. The shape of the insulating ring 1 is a turned annular plate, and the center of the insulating ring 1 is provided with a concentric hole. The insulating ring The upper and lower outer surfaces of 1 are parallel to each other, and the middle parts of the inner arc and the outer arc of the insulating ring 1 are horizontally flush with each other and are provided with an arc surface groove 11, which is a circular rectangular groove, and the inner and outer arc surface grooves 11 have the same shape, and the distance between the upper surface of the arc surface groove 11 and the bottom surface of the insulating ring 1 is the same as the distance between the upper surface of the fixed hook 21 and the upper surface of the insulating pad 2, and the guide slope 12 is a turning guide slope, and the upper side of the guide slope 12 is less than the lower side of the guide slope 12. In terms of horizontal and vertical height, the upper edge of the guide slope 12 and the lower surface of the arc groove 11 are provided with arc chamfers at the junction. The insulating spacer 2 is in the shape of a planed rectangular block. Fixed hooks 21 are planed above both ends of the insulating spacer 2. The inner spacing of the fixed hooks 21 at both ends is the same as the spacing between the outer arc edge and the inner arc edge of the insulating ring 1. The shape of the fixed hook 21 is a right-angle hook. The fixed hook 21 is an integrated planed and formed hook, and the cross-sectional shape of the fixed hook 21 is the same as the cross-sectional shape of the arc groove 11.

[0024] Implementation examples;

[0025] The insulating ring 1 is placed on a lathe during production, and the arc surface groove 11 and the guide slope 12 are turned together while the flatness and parallelism of the two sides of the insulating ring 1 are calibrated.

[0026] When producing the insulating block, a whole batching block is used, and a planer is used to directly plane the batching block from the upper surface, and fixed hooks 21 and fitting inner slopes 22 are planed from the upper surface of the batching block at both ends.

[0027] During assembly, it is only necessary to obliquely insert the fixing hook 21 of one end of the insulating spacer 2 without the fitting inner slope 22 into the outer arc groove 11 of the insulating ring 1. While being inserted into the interior, the other end of the insulating spacer 2 slides into the inner arc groove 11 along the guide slope 12. Finally, the fitting inner slope 22 and the guide slope 12 are fitted and fixed to complete the installation.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An insulating end ring for an oil-immersed transformer, the insulating end ring comprising an insulating ring and an insulating spacer, a plurality of insulating spacers are provided at equal intervals in an annular manner at the bottom of the insulating ring, characterized in that: The inner arc and the outer arc of the insulating ring are provided with arc grooves in the middle of the surface, and the arc grooves are annular rectangular grooves. Insulating pads are provided below the outer sides of the arc grooves of the inner arc and the outer arc. A guide slope is provided at the bottom of the inner hole of the insulating ring, one side of the guide slope is connected to the bottom surface of the arc groove, and an insulating pad is provided on the outside of the guide slope. The insulating pad is in the shape of a rectangular block, and fixed hooks are provided above the two ends of the insulating pad. A fitting inner slope is provided on the inner side of the fixed hook at one end of the insulating pad. The fixed hook is connected to the arc groove by clamping, and the connecting edge of the guide slope and the arc groove is provided with an arc chamfer.

2. The insulating end ring for an oil-immersed transformer according to claim 1, characterized in that: The insulating ring is in the shape of a turned annular plate, with a concentric hole in the center, the upper and lower outer surfaces of the insulating ring are parallel to each other, and the middle of the inner arc and the outer arc of the insulating ring are both horizontally and flushly provided with arc surface grooves.

3. The insulating end ring for an oil-immersed transformer according to claim 1, characterized in that: The arc surface slot is a ring-shaped rectangular slot, and the inner and outer arc surface slots have the same shape. The distance between the upper surface of the arc surface slot and the bottom surface of the insulating ring is the same as the distance between the upper surface of the fixed hook and the upper surface of the insulating pad.

4. The insulating end ring for an oil-immersed transformer according to claim 1, characterized in that: The guide slope is a turning guide slope, the vertical height of the upper side of the guide slope is smaller than the horizontal vertical height of the lower side of the guide slope, and a circular chamfer is provided at the junction of the upper side of the guide slope and the lower surface of the arc groove.

5. The insulating end ring for an oil-immersed transformer according to claim 1, characterized in that: The insulating pad is in the shape of a planed rectangular block, with fixed hooks planed above both ends of the insulating pad. The inner spacing of the fixed hooks at both ends is the same as the spacing between the outer arc edge and the inner arc edge of the insulating ring.

6. The insulating end ring for an oil-immersed transformer according to claim 1, characterized in that: The shape of the fixed hook is a right-angle hook, and the fixed hook is an integral planed hook. The cross-sectional shape of the fixed hook is the same as the cross-sectional shape of the arc surface slot.

Images