Dry-type transformer low-voltage winding fixing structure

Abstract

The utility model discloses a dry-type transformer low-voltage winding fixing structure which comprises an iron core, an iron core resin sealing layer arranged on one side of the iron core and a low-voltage winding arranged on the outer side of the iron core in a sleeved mode, and the dry-type transformer low-voltage winding fixing structure comprises a fixing piece and a thickness adjusting piece. The fixing piece comprises a first binding face capable of being bonded with an iron core resin sealing layer and a second binding face capable of being bonded with an iron core, the first binding face and the second binding face are located on the inner side of the fixing piece, and the inner side of the fixing piece is opposite to the outer side of the fixing piece in the thickness direction; and the thickness adjusting piece can be detachably connected to the outer side of the fixing piece. The fixing structure for the low-voltage winding of the dry-type transformer is simple in structure, the fixing piece and the thickness adjusting piece are detachably connected, the fixing structure can be used after being installed, the safe distance between the low-voltage winding and the iron core can be effectively controlled, and the purposes of supporting, limiting and fixing are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry-type transformer installation, in particular to a dry-type transformer low-voltage winding fixing structure. Background Art

[0002] At present, the low-voltage winding of dry-type transformers is usually fixed relative to the core in the following two ways: one is to install an adhesive epoxy board support plate between the low-voltage winding and the core. The disadvantage of this method is that the installation of the support plate affects the heat dissipation area of ​​the core. At the same time, the material and labor costs are high, the production process (glue and dry) cycle is too long, and there is a risk of failure and falling off in the later stage; the other is to use the dry-type transformer clamp to press the support pads at the upper and lower ends of the low-voltage winding, and no limit support is provided between the low-voltage winding and the core. The disadvantage of this method is that it requires high processing accuracy for the low-voltage winding, and installation deviations are prone to cause looseness in the later stage. During the power-on operation of the dry-type transformer, the low-voltage winding expands and contracts. The height fixation will drive the change of the core structure of the entire dry-type transformer, affecting the fixation of the core and the stability of product quality.

[0003] Therefore, how to design a dry-type transformer low-voltage winding fixing structure that can control the safe distance between the low-voltage winding and the iron core and reduce the occurrence of transformer structure loosening is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a low-voltage winding fixing structure for a dry-type transformer, which can control the safe distance between the low-voltage winding and the iron core and reduce the occurrence of loose transformer structure.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A dry-type transformer low-voltage winding fixing structure, the dry-type transformer comprises an iron core, an iron core resin sealing layer arranged on one side of the iron core, and a low-voltage winding sleeved on the outside of the iron core, characterized in that the dry-type transformer low-voltage winding fixing structure comprises:

[0007] A fixing member, the fixing member comprising a first bonding surface capable of bonding with the iron core resin sealing layer and a second bonding surface capable of bonding with the iron core, the first bonding surface and the second bonding surface are located on the inner side of the fixing member, and the inner side of the fixing member is opposite to the outer side of the fixing member in the thickness direction;

[0008] The thickness adjusting piece can be detachably connected to the outer side of the fixing piece.

[0009] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, the fixing member includes a first fixing part and a second fixing part, the first fixing part is vertically connected to the second fixing part, and the first fitting surface is formed on the inner side of the first fixing part, and the second fitting surface is formed on the inner side of the second fixing part.

[0010] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, a chamfer is provided at the connection between the first fixing part and the second fixing part.

[0011] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, a first inclined surface is arranged on the outer side of the first fixing part, a second inclined surface is arranged on the outer side of the second fixing part, and the first inclined surface and the second inclined surface are connected by a curved surface.

[0012] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, a groove is provided on the outer side of the fixing piece, and a protrusion matching with the groove is provided on the inner side of the thickness adjusting piece.

[0013] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, the thickness adjustment member includes two symmetrically arranged ones, a first groove is arranged on the outer side of the first fixing part, a second groove is arranged on the outer side of the second fixing part, and the first groove is connected to the second groove.

[0014] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, the thickness adjusting piece includes a connecting end, and when the protrusions of the two thickness adjusting pieces are respectively inserted into the corresponding grooves, the connecting ends of the two thickness adjusting pieces abut against each other.

[0015] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, the surface outside the connecting end is a curved surface, so that the outer peripheral surface formed by the abutment of the two thickness adjustment parts forms a chamfer, and the radius of the chamfer is the same as the chamfer radius of the inner wall of the low-voltage winding.

[0016] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, the fixing part is bonded to the iron core and the iron core resin sealing layer through liquid silicone.

[0017] Optionally, in the above-mentioned dry-type transformer low-voltage winding fixing structure, the materials of the fixing part and the thickness adjusting part are both silicone material.

[0018] The low-voltage winding fixing structure of the dry-type transformer provided by the embodiment of the utility model, the first fitting surface and the second fitting surface of the fixing part can increase the contact area between the fixing part and the iron core, so that the fixing part and the iron core are well bonded, and the occurrence of loosening and falling problems during the operation of the dry-type transformer can be reduced. The fixing part and the thickness adjustment part have a simple structure and are easy to process. The thickness adjustment part and the fixing part are detachably connected, easy to disassemble and assemble, and can be installed and used immediately. They can effectively control the safe distance between the low-voltage winding and the iron core, and play the purpose of supporting, limiting, and fixing. The fixing part and the thickness adjustment part are small in size, which can reduce the impact on the heat dissipation of the main channel. The thickness adjustment part can be used according to the design specifications of the dry-type transformer, and can meet the installation requirements of the low-voltage winding of the dry-type transformer with different design specifications. The fixing part and the thickness adjustment part have a simple structure, low processing difficulty and cost, and have no effect on the production cycle of the dry-type transformer. Compared with the adhesive epoxy board support plate of the prior art, the production cost can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a front view of the low-voltage winding fixing structure of the dry-type transformer disclosed in the embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the fixing structure of the low-voltage winding of the dry-type transformer disclosed in the embodiment of the utility model;

[0022] Figure 3 It is a front view of the fixing member disclosed in the embodiment of the utility model;

[0023] Figure 4 It is a structural schematic diagram of a fixing member disclosed in an embodiment of the utility model;

[0024] Figure 5 A front view of a thickness adjusting member disclosed in an embodiment of the utility model;

[0025] Figure 6 It is a schematic diagram of the structure of the thickness adjusting member disclosed in the embodiment of the utility model;

[0026] Figure 7 The utility model discloses a schematic diagram of the installation of a low-voltage winding fixing structure of a dry-type transformer.

[0027] Figure 1-Figure 7The meanings of the various reference numerals in the figure are as follows:

[0028] 110 is a fixing member, 111 is a first fixing portion, and 112 is a second fixing portion;

[0029] 120 is a thickness adjustment member, 121 is a protrusion, and 122 is a connection end;

[0030] 201 is an iron core, and 202 is an iron core resin sealing layer. DETAILED DESCRIPTION

[0031] The core of the utility model is to provide a low-voltage winding fixing structure of a dry-type transformer, which can control the safe distance between the low-voltage winding and the iron core and reduce the occurrence of looseness of the transformer structure.

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that the low-voltage winding fixing structure of the dry-type transformer disclosed in the embodiment of the utility model is applied to resin-cast dry-type transformers, which are widely used in various fields, such as high-rise buildings, power substations, petroleum, chemical industry, etc. The installation of low-voltage windings is an indispensable link in the production process of resin-cast dry-type transformers. The dry-type transformer includes an iron core 201, a resin sealing layer 202 arranged on one side of the iron core 201, and a low-voltage winding sleeved on the outer side of the iron core 201. Figure 7 As shown, the core resin sealing layer 202 is an inclined surface.

[0034] like Figure 1-Figure 2 As shown, the embodiment of the utility model discloses a dry-type transformer low-voltage winding fixing structure, including a fixing member 110 and a thickness adjusting member 120 .

[0035] The structural diagram of the fixing member 110 is shown in FIG. Figure 3-Figure 4 As shown, the fixing member 110 includes a first bonding surface that can be bonded to the iron core resin sealing layer 202 and a second bonding surface that can be bonded to the iron core 201. The first bonding surface and the second bonding surface are arranged on the inner side of the fixing member 110, that is, the side close to the iron core 201, and the inner side and the outer side are opposite in the thickness direction. The first bonding surface is an inclined surface, which matches the inclination of the surface of the iron core resin sealing layer 202, so that the fixing member 110 can be bonded to the iron core resin sealing layer 202, and the second bonding surface is a straight surface, which matches the surface of the iron core 201.

[0036] The fixing member 110 can be bonded to the iron core 201 and the iron core resin sealing layer 202 by an adhesive. The adhesive can be selected from but not limited to liquid silicone. Liquid silicone has a certain viscosity and high temperature resistance, which can ensure the firmness of the bonding. Figure 7 As shown, the arrangement of the first fitting surface and the second fitting surface enables the fixing member 110 to effectively fit with the iron core 201, which can increase the contact area, ensure the firmness of the fixing member 110 and the iron core 201, and reduce the occurrence of loosening or falling off during the operation of the dry-type transformer in the later stage.

[0037] The thickness adjusting member 120 can be detachably connected to the outer side of the fixing member 110, that is, the thickness of the whole can be increased after the thickness adjusting member 120 is connected to the fixing member 110, and the specific connection method is not limited. When in use, it can be determined whether to use the thickness adjusting member 120 according to the specific design specifications of different dry-type transformers. The specific thickness of the thickness adjusting member 120 can be specifically determined according to actual needs, and multiple specifications can also be designed.

[0038] The low-voltage winding fixing structure of the dry-type transformer provided by the embodiment of the utility model, when in use, makes the first bonding surface of the fixing member 110 bonded to the iron core resin sealing layer 202, and the second bonding surface bonded to the iron core 201. During installation, according to the height of different low-voltage windings of different models of dry-type transformers or the safety distance of the main channel, the low-voltage winding fixing structure of the dry-type transformer can be installed at the corresponding (height) position. Figure 7 As shown, the structure is installed at the four corners of the core 201 .

[0039] According to the design specifications of the dry-type transformer, especially the safety distance requirements between the low-voltage winding and the iron core 201, it is determined whether to use the thickness adjustment member 120 to adjust the thickness of the fixing member 110. After the low-voltage winding fixing structure of the dry-type transformer of this application is installed, the low-voltage winding is assembled.

[0040] The low-voltage winding fixing structure of the dry-type transformer provided by the embodiment of the utility model, the setting of the first fitting surface and the second fitting surface increases the contact area between the fixing member 110 and the iron core 201, can make the fixing member 110 and the iron core 201 fit better, and can reduce the occurrence of loosening and falling problems during the operation of the dry-type transformer.

[0041] The low-voltage winding fixing structure of the dry-type transformer disclosed in the embodiment of the utility model has a simple structure, and the thickness adjustment member 120 is detachably connected to the fixing member 110, which can be installed and used immediately, has no effect on the production cycle of the dry-type transformer, has low processing difficulty and cost, and can effectively reduce production costs. The dry-type transformer fixing structure is located between the iron core 201 and the low-voltage winding. The fixing member 110 and the thickness adjustment member 120 are relatively small in size, and can effectively control the safe distance between the low-voltage winding and the iron core 201. Compared with the structure of the prior art that installs the edge support bar support, it can reduce the impact on the heat dissipation of the main channel, and achieves the purpose of supporting, limiting, and fixing, shortening the installation steps of the insulating member support during the assembly process of the transformer.

[0042] like Figure 4 As shown, in a specific embodiment of the present invention, the fixing member 110 includes a first fixing portion and a second fixing portion 112, and the first fixing portion 111 is vertically connected to the second fixing portion 112, that is, the cross-section of the fixing member 110 is an L-shaped structure, and the first fitting surface is formed on the inner side of the first fixing portion 111, and the second fitting surface is formed on the inner side of the second fixing portion 112.

[0043] In order not to damage the low voltage winding, the connection between the first fixing portion 111 and the second fixing portion 112 is configured as a rounded structure.

[0044] In order to guide the low voltage winding when installing it, Figure 2 and Figure 4 As shown, in a specific embodiment, a first inclined surface is provided on the outer side of the first fixing portion 111, and a second inclined surface is provided on the outer side of the second fixing portion 112. Both the first inclined surface and the second inclined surface are inclined from top to bottom, and the first inclined surface and the second inclined surface are connected by a curved surface for a smooth transition. The arrangement of the first inclined surface and the second inclined surface can guide the inner wall of the low-voltage winding to slide to a specified distance when the low-voltage winding is installed, and then move down and fix to the specified pad position. The inclination angle of the inclined surface is specifically determined in combination with the safety distance selected in the subsequent design of the dry-type transformer and the electrical safety distance reserved for the low-voltage winding, and needs to match the dimensions around the core 201.

[0045] like Figure 4 and Figure 5 As shown, in a specific embodiment of the utility model, a groove is provided on the outer side of the fixing member 110, and a protrusion matching the groove is provided on the inner side of the thickness adjusting member 120. When the two are connected, the protrusion of the thickness adjusting member 120 is inserted into the groove of the fixing member 110. This connection method is simple to operate, plug and play, and easy to assemble and disassemble.

[0046] In order to better cooperate with the fixing member 110, the thickness adjusting member 120 includes two symmetrically arranged members, a first groove is arranged on the outer side of the first fixing portion 111, and a second groove is arranged on the outer side of the second fixing portion 112, and the first groove and the second groove are connected to each other. When installing, the protrusions 121 of the two thickness adjusting members 120 are respectively inserted into the first groove and the second groove for embedded installation.

[0047] like Figure 5 and Figure 6 As shown, the thickness adjusting member 120 is a rectangular parallelepiped structure as a whole, including a connecting end 122. When the protrusions of the two thickness adjusting members 120 are respectively inserted into the corresponding grooves, the connecting ends 122 of the two thickness adjusting members 120 are abutted.

[0048] In order to reduce the wear and scratches on the low-voltage winding, on the basis of the above embodiment, the surface of the connection end of the thickness adjustment member 120 is curved, so that the outer peripheral surface of the two thickness adjustment members 120 after abutting forms a rounded corner, and the radius of the rounded corner is the same as the radius of the chamfer of the inner wall of the low-voltage winding, so as to ensure that the joint support is tightly matched after the low-voltage winding is assembled, and the position of the rounded corner corresponds to the position of the rounded corner at the connection between the first fixing part 111 and the second fixing part 112. The setting of the rounded corner can prevent the thickness adjustment member 120 from wearing and scratching the low-voltage winding, and play a protective role.

[0049] In the low-voltage winding fixing structure of the dry-type transformer disclosed in the embodiment of the utility model, the fixing member 110 is an integrally formed structure, and the fixing member 110 and the thickness adjusting member 120 are both made of silicone. The hardness of the silicone itself is relatively soft, and it will not cause substantial pressing force on the core laminations, and will not affect the magnetostriction of the core 201, thereby reducing the hidden danger of no-load loss of the dry-type transformer. At the same time, the cost of the silicone material is relatively low, which can effectively reduce the production labor cost and shorten the processing cycle.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0052] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0053] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A dry-type transformer low-voltage winding fixing structure, the dry-type transformer comprising an iron core (201), an iron core resin sealing layer (202) arranged on one side of the iron core (201), and a low-voltage winding sleeved on the outside of the iron core (201), characterized in that: The dry-type transformer low-voltage winding fixing structure comprises: A fixing member (110), the fixing member (110) comprising a first bonding surface capable of bonding to the iron core resin sealing layer (202) and a second bonding surface capable of bonding to the iron core (201), the first bonding surface and the second bonding surface being located on the inner side of the fixing member (110), the inner side of the fixing member (110) being opposite to the outer side of the fixing member in a thickness direction; A thickness adjusting piece (120), wherein the thickness adjusting piece (120) can be detachably connected to the outer side of the fixing piece (110).

2. The low voltage winding fixing structure of the dry-type transformer according to claim 1, characterized in that: The fixing member (110) comprises a first fixing portion (111) and a second fixing portion (112), wherein the first fixing portion (111) is vertically connected to the second fixing portion (112), and the first fitting surface is formed on the inner side of the first fixing portion (111), and the second fitting surface is formed on the inner side of the second fixing portion (112).

3. The low voltage winding fixing structure of the dry-type transformer according to claim 2, characterized in that: A chamfer is provided at the connection between the first fixing portion (111) and the second fixing portion (112).

4. The low voltage winding fixing structure of the dry-type transformer according to claim 3, characterized in that: A first inclined surface is provided on the outer side of the first fixing portion (111), a second inclined surface is provided on the outer side of the second fixing portion (112), and the first inclined surface and the second inclined surface are connected via a curved surface.

5. The low voltage winding fixing structure of the dry-type transformer according to claim 4, characterized in that: The outer side of the fixing piece (110) is provided with a groove, and the inner side of the thickness adjusting piece (120) is provided with a protrusion (121) matching with the groove.

6. The low voltage winding fixing structure of the dry-type transformer according to claim 5, characterized in that: The thickness adjusting member (120) comprises two symmetrically arranged ones, a first groove is arranged on the outer side of the first fixing portion (111), a second groove is arranged on the outer side of the second fixing portion (112), and the first groove is connected to the second groove.

7. The low voltage winding fixing structure of a dry-type transformer according to claim 6, characterized in that: The thickness adjusting member (120) comprises a connecting end (122), and when the protrusions (121) of the two thickness adjusting members (120) are respectively inserted into the corresponding grooves, the connecting ends (122) of the two thickness adjusting members (120) abut against each other.

8. The low voltage winding fixing structure of a dry-type transformer according to claim 7, characterized in that: The outer surface of the connection end (122) is a curved surface, so that the outer peripheral surface formed by the abutment of the two thickness adjustment members (120) forms a rounded corner, and the radius of the rounded corner is the same as the chamfer radius of the inner wall of the low-voltage winding.

9. The low-voltage winding fixing structure of a dry-type transformer according to any one of claims 1 to 8, characterized in that: The fixing member (110) is bonded to the iron core (201) and the iron core resin sealing layer (202) via liquid silicone.

10. The low voltage winding fixing structure of a dry-type transformer according to any one of claims 1 to 8, characterized in that: The fixing member (110) and the thickness adjusting member (120) are both made of silicone material.

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