High-efficiency heat-dissipation air passage structure for coil of dry-type transformer

Abstract

The utility model discloses an efficient heat dissipation dry-type transformer coil air passage structure which comprises a coil, an inner layer framework is arranged in the coil, a plurality of layers of wires are wound on the inner layer framework, interlayer insulation is arranged between every two layers of wires, a wide air passage is arranged between every two adjacent layers of wires, and the wide air passage is communicated with the inner layer framework. A layer of air channel inner protection glass fiber gridding cloth is wound on the outer side of the inner layer of the wire at the position of the wide air channel, and a circle of semi-arc air channel rod is arranged on the inner protection glass fiber gridding cloth of the wide air channel in the axial direction. According to the utility model, a wide air passage structure can be formed, the air passage greatly increases the heat dissipation area, the conditions of unsmooth air circulation and non-circulation of the traditional air passage structure are avoided, the wide air passage can avoid the influence of blockage of the air passage caused by upper and lower cushion blocks of the coil, the heat dissipation capability is effectively improved, cross-linking intervals among the air passages of the traditional air passage structure are reduced, and the heat dissipation efficiency is improved. The heat dissipation area is increased, epoxy resin consumption is reduced, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field more particularly is a kind of high -efficient heat dissipation dry-type transformer coil air passage structure. BACKGROUND

[0002] The temperature rise of transformer is the key to affect its life and overload capacity, and the high-voltage coil of dry-type transformer usually adopts epoxy resin casting structure, and different numbers and sizes of air passages are arranged in the coil according to the design requirements of temperature rise.

[0003] The traditional air passage is arranged at certain intervals by pre-installed air passage rods, and after the coil is poured and formed, the air passage rods are pulled out to form several air passage holes in the coil, and each air passage hole is filled with epoxy resin and is not communicated with each other. The single air passage hole of this air passage structure is small, which is not conducive to air convection and heat dissipation, and the several crosslinked epoxy resins between the air passages occupy a large space. Although it has heat dissipation capacity itself, it is limited by the thermal conductivity coefficient, so that the heat dissipation capacity is greatly reduced. In addition, since the coil needs to be supported and compressed by upper and lower pads, the width size of the pad is often larger than the size of the traditional air passage hole, so that 1 to 2 air passage positions of each pad position are blocked, thereby further reducing the heat dissipation channel and reducing the heat dissipation capacity of the coil air passage. Therefore, a new technical solution is needed to solve it. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a kind of high -efficient heat dissipation dry-type transformer coil air passage structure to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of high -efficient heat dissipation dry-type transformer coil air passage structure, comprising: coil, the inside of the coil is provided with inner layer framework, a plurality of layers of conductors are wound on the inner layer framework, and interlayer insulation is provided between each layer of conductors, wide air passage is provided between adjacent two layers of the conductors, a layer of air passage inner protective glass fiber mesh cloth is wound on the outer side of the inner layer conductor at the position of the wide air passage, a circle of semicircular air passage rods is arranged on the air passage inner protective glass fiber mesh cloth along the axial direction, the semicircular air passage rods are connected head to tail, six interval gaps are arranged between the semicircular air passage rods to form a tie bar body, the semicircular air passage rods are divided into paragraphs by the tie bar body, and a round silica gel strip is arranged between the concave surface of the last semicircular air passage rod of the wide air passage of each paragraph and the tie bar;Air passage outer protective glass fiber mesh cloth is arranged on the semicircular air passage rod, and the outer layer conductor at the position of the wide air passage is wound on the air passage outer protective glass fiber mesh cloth;The outermost layer of the coil is provided with outer layer framework, and the outer layer framework is formed by interlaced winding of glass fiber mesh cloth.

[0006] As a preferred embodiment of the utility model, the inner layer framework and the outer layer framework are formed by interlaced winding of several layers of glass fiber mesh.

[0007] As a preferred embodiment of the utility model, the semicircular arc air channel rod is made of polytetrafluoroethylene, and the semicircular arc air channel rod has a long strip structure with a convex semicircular arc surface at one end and a concave semicircular arc surface at the other end.

[0008] As a preferred embodiment of the utility model, the semicircular arc air channel rods are connected end to end and the convex semicircular arc surfaces and the concave semicircular arc surfaces are embedded in each other.

[0009] As a preferred embodiment of the utility model, the tie bars embedded between the semicircular arc air channel rods are filled with tie bar glass fiber mesh.

[0010] As a preferred embodiment of the utility model, the coil is made by epoxy resin pouring filling.

[0011] Compared with the prior art, the utility model has the beneficial effects as follows:

[0012] The utility model can form a wide air channel structure, which greatly increases the heat dissipation area, avoids the poor air flow and the situation of not flowing into each other of the traditional air channel structure, and avoids the influence of the upper and lower pads on the air channel, effectively improves the heat dissipation capacity, reduces the crosslinking interval between the air channels of the traditional air channel structure, reduces the amount of epoxy resin while increasing the heat dissipation area, reduces the cost, the semicircular arc air channel rod structure has a convex-concave arc structure, which can be seamlessly connected at the head and tail according to different coil structures and corner radii, and the utility model solves the problem that the adjacent traditional air channel rod arc parts are easy to form a triangular gap and need to be polished, the glass fiber mesh in the tie bar embedded between the air channel rods is formed by epoxy resin pouring, has high strength and is not easy to crack, connects the inner and outer line segments into a whole, and the tie bar position can be set at the coil pad position to form effective support without occupying the heat dissipation area. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a high-efficiency heat dissipation dry-type transformer coil air channel cross-section structure schematic view of the utility model;

[0014] Figure 2 It is a semicircular arc air channel rod structure schematic view of the utility model;

[0015] Figure 3 It is a high-efficiency heat dissipation dry-type transformer coil air channel overall structure schematic view of the utility model.

[0016] In the figure: 1, outer frame; 2, wire; 3, airway outer protection glass fiber mesh cloth; 4, round silica gel strip; 5, airway inner protection glass fiber mesh cloth; 6, semicircle airway rod; 7, interlayer insulation; 8, inner frame; 9, contact muscle glass fiber mesh cloth; 10, epoxy resin; 11, contact muscle body; 12, wide airway. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] Please refer to Figures 1-3 The utility model provides a kind of technical scheme: a high-efficiency radiating dry-type transformer coil airway structure.

[0019] For the traditional airway, preset airway rod is arranged at certain interval, airway rod is pulled out after coil pouring and forming, and several airway holes are formed in coil inside, each airway hole is filled with epoxy resin and is not communicated with each other, the single airway hole of this airway structure is small, which is not conducive to air convection heat dissipation, and several crosslinking epoxy resins between airways occupy a large amount of space, although it also has heat dissipation capacity, but is limited by heat transfer coefficient, so that heat dissipation capacity is greatly reduced.In addition, since coil needs to be supported and compressed by upper and lower pads, the width size of pad is often greater than the size of traditional airway hole, so that 1 to 2 airway positions are blocked at each pad position, thereby further reducing the heat dissipation channel and reducing the heat dissipation capacity of coil airway.

[0020] The solution is as follows: an efficient heat dissipation dry-type transformer coil air channel structure, comprising: a coil, an inner layer framework 8 is arranged in the inside of the coil, a plurality of layers of conductive wires 2 are wound on the inner layer framework 8, and interlayer insulation 7 is arranged between each layer of conductive wires 2, a wide air channel 12 is arranged between adjacent two layers of the conductive wires 2, a layer of air channel inner protective glass fiber mesh cloth 5 is wound on the outside of the inner layer conductive wire 2 at the position of the wide air channel 12, a circle of semicircular air channel rods 6 are arranged on the air channel inner protective glass fiber mesh cloth 5 in the axial direction, the semicircular air channel rods 6 are connected end to end, six interval gaps are arranged between the semicircular air channel rods 6 to form a communication tendon body 11, the circle of semicircular air channel rods 6 is divided into paragraphs by the communication tendon body 11, a round silica gel strip 4 is arranged between the concave surface of the last semicircular air channel rod 6 of the wide air channel 12 of each paragraph and the communication tendon; the semicircular air channel rod 6 is provided with air channel outer protective glass fiber mesh cloth 3, the outer layer conductive wire 2 at the position of the wide air channel 12 is wound on the air channel outer protective glass fiber mesh cloth 3, and an outer layer framework 1 is arranged on the outermost layer of the coil, the outer layer framework 1 is formed by interlaced winding of a plurality of layers of glass fiber mesh cloth, the inner layer framework 8 is arranged in the inside of the coil as a support, and the inner layer framework 8 is formed by interlaced winding of three layers of 1.2 mm glass fiber mesh cloth; a plurality of layers of conductive wires 2 are wound on the inner layer framework 8, and interlayer insulation 7 is arranged between each layer of conductive wires 2; according to the design, the air channel structure is arranged between appropriate two layers of conductive wires 2, a layer of 0.6 mm thick air channel inner protective glass fiber mesh cloth 5 is wound on the outside of the inner layer conductive wire 2 at the position of the air channel in advance, and a circle of semicircular air channel rods 6 with special structures are arranged on the air channel inner protective glass fiber mesh cloth 5 in the axial direction, the semicircular air channel rods 6 are connected end to end and closely inclined, six interval gaps are evenly arranged between the circle of semicircular air channel rods 6 to form a communication tendon body 11, the communication tendon body 11 divides the whole circle of semicircular air channel rods 6 into several continuous paragraphs, and a round silica gel strip 4 is arranged between the concave surface of the last semicircular air channel rod 6 of each air channel and the communication tendon body 11; a layer of 0.6 mm air channel outer protective glass fiber mesh cloth 3 is wound on the semicircular air channel rod 6, and the outer layer conductive wire 2 at the position of the air channel is wound on the air channel outer protective glass fiber mesh cloth 3; an outer layer framework 1 is arranged on the outermost layer of the whole coil, and the outer layer framework 1 is formed by interlaced winding of two layers of 1.0 mm glass fiber mesh cloth; the whole structure is encapsulated by a special mold, then filled with epoxy resin 10 under vacuum condition, and after curing in a special curing furnace, all the semicircular air channel rods 6 and the round silica gel strips 4 are taken out, and demolding is performed to form a coil with a wide air channel 12 structure.

[0021] Further improvement, as shown in Figure 1 The inner layer framework 8 and the outer layer framework 1 are formed by interlaced winding of a plurality of layers of glass fiber mesh cloth, which effectively supports the layers of conductive wires 2 in the inside of the coil, prevents deformation or damage during pouring of the epoxy resin 10, and ensures the overall structural integrity and reliability of the coil.

[0022] Further improved, as shown in Figure 2 The semicircular air duct rod 6 is made of polytetrafluoroethylene, and the semicircular air duct rod 6 has a long strip structure with a convex semicircular surface at one end and a concave semicircular surface at the other end. Polytetrafluoroethylene has good insulation, corrosion resistance and high temperature resistance. The semicircular air duct rod 6 made of this material can effectively prevent performance degradation caused by temperature changes or chemical corrosion, and ensure long-term stable operation of the air duct structure.

[0023] Further improved, as shown in Figure 2 The semicircular air duct rod 6 is made of polytetrafluoroethylene, and the semicircular air duct rod 6 has a long strip structure with a convex semicircular surface at one end and a concave semicircular surface at the other end. Polytetrafluoroethylene has good insulation, corrosion resistance and high temperature resistance. The semicircular air duct rod 6 made of this material can effectively prevent performance degradation caused by temperature changes or chemical corrosion, and ensure long-term stable operation of the air duct structure.

[0024] Further improved, as shown in Figure 1 As a preferred embodiment of the utility model, the connecting rib body 11 uniformly arranged between the semicircular air duct rods 6 is filled with connecting rib glass fiber mesh cloth 9. The filling of the connecting rib glass fiber mesh cloth 9 enhances the strength and toughness of the connecting rib body 11, so that it can better support the semicircular air duct rod 6 and prevent it from deforming.

[0025] Further improved, as shown in Figure 1 The coil is made by pouring and filling epoxy resin 10. Epoxy resin 10 has excellent insulation, high temperature resistance and mechanical strength. Pouring and filling the coil with it can ensure that the electrical and mechanical properties of the coil meet the design requirements.

[0026] Working principle: the utility model discloses a first, the inner layer framework 8 is set up in the coil inside as support, and the inner layer framework 8 is formed by three layers 1.2mm glass fiber mesh cloth interlaced winding, and a plurality of layers of wire 2 are wound on the inner layer framework 8, and the interlayer insulation 7 is arranged between each layer of wire 2, and the air channel structure is set up between the proper two layers of wire 2 according to the design selection, and a layer of 0.6mm thick air channel inner protective glass fiber mesh cloth 5 is wound on the outside of the inner layer wire 2 at the air channel position in advance, and a circle of special structure's semicircle air channel bar 6 is placed on the air channel inner protective glass fiber mesh cloth 5 along the axial direction, and the semicircle air channel bar 6 is connected closely and is obliquely connected in the head-to-tail mode, and six interval air raid structures are arranged evenly between the circle of semicircle air channel bar 6 and constitute the tie body 11, and the tie body 11 divides the whole circle of semicircle air channel bar 6 into continuous sections, and a round silica gel strip 4 is placed between the concave surface of the last semicircle air channel bar 6 of each section air channel and the tie body 11, and a layer of 0.6mm air channel outer protective glass fiber mesh cloth 3 is wound on the semicircle air channel bar 6, and the outer layer wire 2 at the air channel position is wound on the air channel outer protective glass fiber mesh cloth 3, and the outer layer framework 1 is set up on the outermost layer of the whole coil, and the outer layer framework 1 is formed by two layers 1.0mm glass fiber mesh cloth interlaced winding, and the whole structure is encapsulated by special mould, and then is poured and filled with epoxy resin 10 under vacuum condition, and all semicircle air channel bars 6 and round silica gel strips 4 are pulled out after curing in special curing oven, and demoulding is carried out to form the coil with wide air channel 12 structure.

[0027] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0028] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change.

[0029] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-efficiency heat-dissipation dry-type transformer coil air channel structure, characterized in that: The utility model relates to a coil, the inside of the coil is provided with an inner layer framework (8), a plurality of layers of conducting wires (2) are wound on the inner layer framework (8), and interlayer insulation (7) is arranged between each layer of conducting wires (2), wide air channels (12) are arranged between two adjacent layers of the conducting wires (2), a layer of air channel inner protective glass fiber mesh cloth (5) is wound on the outside of the conducting wire (2) at the position of the wide air channel (12), a circle of semicircular air channel rods (6) are arranged on the air channel inner protective glass fiber mesh cloth of the wide air channel (12) in the axial direction, the semicircular air channel rods (6) are connected end to end, six interval gaps are arranged between the semicircular air channel rods (6) to form a communication tendon body (11), a circle of the semicircular air channel rods (6) are divided into paragraphs by the communication tendon body (11), a round silica gel strip (4) is arranged between the concave surface of the last semicircular air channel rod (6) of the wide air channel (12) and the communication tendon in each paragraph, air channel outer protective glass fiber mesh cloth (3) is arranged on the semicircular air channel rod (6), the conducting wire (2) of the outer layer of the wide air channel (12) is wound on the air channel outer protective glass fiber mesh cloth (3), and outer layer framework (1) is arranged on the outermost layer of the coil, and the outer layer framework (1) is formed by interlaced winding of glass fiber mesh cloth. The inner layer framework (8) and the outer layer framework (1) are formed by interlaced winding of a plurality of layers of glass fiber mesh cloth.

2. The high-efficiency heat-dissipation dry-type transformer coil air channel structure according to claim 1, characterized in that: The semicircular air channel rod (6) is made of polytetrafluoroethylene, and the semicircular air channel rod (6) has a long strip structure with a convex semicircular arc surface at one end of the cross section and a concave semicircular arc surface at the other end.

3. The high-efficiency heat-dissipation dry-type transformer coil air channel structure according to claim 1, characterized in that: A plurality of groups of the semicircular air channel rods (6) are connected end to end and embedded in each other between the convex semicircular arc surfaces and the concave semicircular arc surfaces.

4. The high efficient heat dissipating dry-type transformer coil air channel structure of claim 1, wherein: The communication tendon body (11) uniformly arranged between the semicircular air channel rods (6) is filled with communication tendon glass fiber mesh cloth (9).

5. The high efficient heat dissipating dry-type transformer coil air channel structure according to claim 1, characterized in that: The whole coil is made by pouring and filling with epoxy resin (10).

6. The high efficient heat dissipating dry-type transformer coil air channel structure of claim 1, wherein: ​

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