Transformer pressing nail insulation assembly structure

Abstract

The utility model relates to a transformer press nail insulation assembly structure, which comprises a press nail, a press nail gasket and an insulation layer, the press nail gasket is provided with a groove, the groove bottom of the groove is provided with an insertion hole, the lower end of the press nail is provided with a limit section which abuts against the groove bottom of the groove, the lower end of the limit section is provided with an insertion section which is inserted into the insertion hole, and the insulation layer is arranged on the press nail gasket. The end face of the lower end of the inserting section is flush with the lower surface of the nail pressing gasket, a welding line is formed between the end face of the lower end of the inserting section and the lower surface of the nail pressing gasket, and insulating layers are arranged on the other portions, except the groove, of the outer side of the nail pressing gasket. According to the utility model, virtual connection between the pressing nail and the pressing nail gasket can be avoided to generate suspended potential, and the structure is simple, the processing is convenient, and the insulating property is reliable.

Description

Technical Field

[0001] This utility model relates to the field of transformer clamping nails, specifically a transformer clamping nail insulation assembly structure. Background Technology

[0002] As the voltage level of transformer products continues to increase, improving the insulation reliability of transformers is an issue that needs to be considered. For transformers that use a clamping pin structure, the electric field around the clamping pin is a key area to consider in improving the insulation reliability of the transformer. This is because the clamping pin is a ground electrode, and any distortion of the electric field distribution at the clamping pin location in a high field strength region may cause the collapse of the entire insulation structure.

[0003] In existing technologies, the pressure pin typically extends into a bowl-shaped pressure pin washer and is clamped by pressing against the pressure pin washer. Furthermore, the pressure pin and pressure pin washer are usually separate structures, making it easy for a loose connection to occur between them, generating a floating potential and potentially causing partial discharge problems. For example, the background technology of patent CN204720298U discloses a traditional pressure pin structure, which includes an upper pad, a pressure bowl (i.e., a pressure pin washer), and a pressure pin. After the coil is assembled, the upper pad is placed first, then the pressure bowl is placed in the groove of the upper pad, and then the pressure pin is screwed into the pressure pin nut and presses against the pressure bowl to apply pressure to the coil. The improvement of patent CN204720298U lies in using a clamping bolt instead of a pressure pin and a pressure plate instead of a pressure bowl. However, the clamping bolt and pressure plate are still separate structures, and this cannot completely guarantee that a loose connection will not occur between them.

[0004] For example, patent CN215600227U also discloses a pressure nail structure, in which the end of the pressure nail is provided with a disc (i.e., a pressure nail washer) for pressing against the pressure nail pad to improve the uniformity of the electric field, and at the same time increase the contact area between the pressure nail and the pressure nail pad to improve the uniformity of the transformer stress. However, in this structure, the end face of the pressure nail end and the bottom of the groove in the middle of the disc are usually welded together. The disadvantage of this method is that it has high requirements for the welding wire. The welding wire cannot exceed the upper end face of the disc, otherwise the exposed welding wire will lead to problems such as poor insulation. However, due to the size of the disc and the depth of the groove in the middle of the disc, the processing of the welding wire in the groove in actual production is time-consuming and laborious, which greatly reduces the production efficiency. At the same time, it cannot guarantee that there will be no loose connection between the pressure nail and the disc. Utility Model Content

[0005] The purpose of this utility model is to provide a transformer pressure nail insulation assembly structure that can ensure that there is no loose connection between the pressure nail and the pressure nail washer, resulting in a floating potential. It is also simple in structure, easy to process, and has reliable insulation performance.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A transformer clamping pin insulation assembly structure includes a clamping pin, a clamping pin washer, and an insulating layer. The clamping pin washer has a groove, and the bottom of the groove has a insertion hole. The lower end of the clamping pin has a limiting section that abuts against the bottom of the groove. The lower end of the limiting section has an insertion section that inserts into the insertion hole. The lower end face of the insertion section is flush with the lower surface of the clamping pin washer. A weld line is formed between the lower end face of the insertion section and the lower surface of the clamping pin washer. The outer part of the clamping pin washer, except for the groove, is provided with an insulating layer.

[0008] The upper outer side of the rivet washer is provided with an upper rounded corner, and the lower outer side of the rivet washer is provided with a lower rounded corner. The insulating layer forms a first insulating layer rounded corner segment and a second insulating layer rounded corner segment connected sequentially from the inside to the outside, corresponding to the position of the upper rounded corner of the rivet washer. The insulating layer forms a third insulating layer rounded corner segment corresponding to the position of the lower rounded corner of the rivet washer.

[0009] After the underside of the rivet washer, along with the weld line, is ground smooth, the insulating layer is formed by coating the outside of the rivet washer with pulp, except for the groove.

[0010] The pressure pin includes a threaded section, a limiting section, and a plug section arranged sequentially with decreasing diameters.

[0011] The advantages and positive effects of this utility model are as follows:

[0012] 1. This utility model utilizes the insertion section at the lower end of the pressure rivet to tightly engage with the insertion hole in the middle of the groove bottom of the pressure rivet washer. At the same time, a welding bevel is formed between the end face of the insertion section at the lower end of the pressure rivet and the lower surface of the pressure rivet washer, and a weld line is formed after welding. This can fully ensure that no loose connection will occur after the pressure rivet and the pressure rivet washer are welded.

[0013] 2. In this utility model, a weld line is formed between the end face of the insertion section at the lower end of the pressure rivet and the lower surface of the pressure rivet washer. This makes subsequent processing easier and improves production efficiency. After welding, it is only necessary to grind the lower side of the pressure rivet washer along with the weld line flat. At the same time, it also solves the problem that the weld line is easily exposed inside and outside the groove of the conventional pressure rivet washer, resulting in poor insulation.

[0014] 3. In this utility model, the welding bevel for welding the pressure nail and the pressure nail washer is located on the lower side of the pressure nail washer. After welding, it is only necessary to grind the lower side of the pressure nail washer along with the weld line flat. This will not affect the paper pulp coating on the outer part of the pressure nail washer, except for the groove, to form an insulating layer, thereby ensuring reliable insulation performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 for Figure 1A schematic diagram showing the connection between the pressure stud and the pressure stud washer.

[0017] Figure 3 This is a structural diagram of a conventional clamping stud and a conventional clamping stud washer in the prior art.

[0018] Figure 4 for Figure 3 A schematic diagram showing the connection between a standard presser stud and a standard presser stud washer.

[0019] Wherein, 1 is a pressure pin, 101 is an insertion section, 102 is a limiting section, 103 is a threaded section, 2 is a pressure pin washer, 201 is a groove, 202 is the upper rounded corner of the pressure pin washer, 203 is the lower rounded corner of the pressure pin washer, 204 is an insertion hole, 3 is an insulating layer, 301 is the rounded corner section of the first insulating layer, 302 is the rounded corner section of the second insulating layer, 303 is the rounded corner section of the third insulating layer, 4 is a welding bevel, 5 is a conventional pressure pin, and 6 is a conventional pressure pin washer. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] like Figures 1-2 As shown, this utility model includes a pressure nail 1, a pressure nail washer 2, and an insulating layer 3. The pressure nail washer 2 has a groove 201, and the bottom of the groove 201 has an insertion hole 204. The lower end of the pressure nail 1 has a limiting section 102 that abuts against the bottom of the groove 201. The lower end of the limiting section 102 has an insertion section 101 that inserts into the insertion hole 204. The lower end face of the insertion section 101 is flush with the lower surface of the pressure nail washer 2. A welding bevel is formed between the lower end face of the insertion section 101 and the lower surface of the pressure nail washer 2. After welding, the welding bevel forms a weld line 4. The outer part of the pressure nail washer 2, except for the groove 201, is provided with an insulating layer 3.

[0022] like Figures 1-2 As shown, this utility model first utilizes the tight insertion fit between the insertion section 101 and the insertion hole 204 to ensure that there will be no loose connection after the pressure pin 1 and the pressure pin washer 2 are welded. Secondly, this utility model changes the position of the welding wire 4 from... Figure 4 The groove shown in the diagram, located within the conventional pressure pin washer 6, has been changed to... Figure 2 The position shown is located on the lower side of the crimping washer 2, which makes it easier to process and improves production efficiency. It also solves the problem in the prior art that the welding wire is easily exposed inside and outside the groove of the conventional crimping washer 6, resulting in poor insulation. After the welding is completed, this utility model only needs to grind the lower side of the crimping washer 2 along with the welding wire 4 flat. This will not affect the setting of the insulation layer 3 on the other part of the outer side of the crimping washer 2 except for the groove 201.

[0023] like Figures 1-2As shown, in this embodiment, the upper outer side of the pressure pin washer 2 is provided with an upper rounded corner 202, and the lower outer side is provided with a lower rounded corner 203. After the lower side of the pressure pin washer 2, together with the welding line 4, is ground smooth, the insulating layer 3 is formed by coating pulp on the outside of the pressure pin washer 2, and as shown... Figure 1 As shown, the insulating layer 3 forms a first insulating layer rounded corner segment 301 and a second insulating layer rounded corner segment 302 in sequence from the inside to the outside at the position of the rounded corner 202 on the upper corner of the pressure pin washer, and the insulating layer 3 forms a third insulating layer rounded corner segment 303 at the position of the lower rounded corner 203 on the lower corner of the pressure pin washer.

[0024] like Figures 1-2 As shown, the pressure pin 1 includes a threaded section 103, a limiting section 102, and a plug-in section 101 arranged sequentially with decreasing diameters.

[0025] The working principle of this utility model is as follows:

[0026] like Figures 3-4 As shown, in the prior art, conventional pressure pins 5 and conventional pressure pin washers 6 are usually separate structures. When a connection is required, the lower end face of the conventional pressure pin 5 abuts against and is welded to the bottom of the groove of the conventional pressure pin washer 6. A weld line 4 is formed on the outer side of the lower end of the conventional pressure pin 5. Due to the size and groove depth limitations of the conventional pressure pin washer 6, the weld line 4 is easily exposed, leading to problems such as poor insulation. Furthermore, grinding is time-consuming and labor-intensive. At the same time, since the weld line 4 is only formed on the outer side of the lower end of the conventional pressure pin 5, a loose connection can easily occur between the lower end face of the conventional pressure pin 5 and the bottom of the groove of the conventional pressure pin washer 6, generating a floating potential and thus causing partial discharge problems.

[0027] And such Figures 1-2 As shown, the pressure pin 1 of this utility model includes a threaded section 103, a limiting section 102, and an insertion section 101 arranged sequentially. The insertion section 101 is inserted into the insertion hole 204 of the pressure pin washer 2 located in the middle of the groove 201. The limiting section 102 limits displacement with the bottom of the groove 201. The threaded section 103 cooperates with related components (such as nuts). The tight insertion of the insertion section 101 into the insertion hole 204, along with the welding wire 4 position, is achieved by... Figure 4 The position shown has been changed Figure 2 The lower side of the pressure pin washer 2 shown can fully ensure that there will be no loose connection between the pressure pin 1 and the pressure pin washer 2, resulting in a floating potential. It also makes the processing simpler and more convenient, improves production efficiency, and solves the problem that the welding wire is easily exposed inside and outside the groove of the conventional pressure pin washer 6 in the prior art, resulting in poor insulation. After the welding is completed, this utility model only needs to grind the lower side of the pressure pin washer 2 along with the welding wire 4 flat. After the above processing is completed, the rest of the outer side of the pressure pin washer 2, except for the groove 201, can be coated with pulp and solidified to form an insulating layer 3, thereby ensuring reliable insulation performance.

Claims

1. A transformer clamping nail insulation assembly structure, characterized in that: The device includes a pressure pin (1), a pressure pin washer (2), and an insulating layer (3). The pressure pin washer (2) has a groove (201) and a insertion hole (204) at the bottom of the groove (201). The lower end of the pressure pin (1) has a limiting section (102) that abuts against the bottom of the groove (201). The lower end of the limiting section (102) has an insertion section (101) that inserts into the insertion hole (204). The lower end face of the insertion section (101) is flush with the lower surface of the pressure pin washer (2). A welding line (4) is formed between the lower end face of the insertion section (101) and the lower surface of the pressure pin washer (2). The outer part of the pressure pin washer (2), except for the groove (201), is provided with an insulating layer (3).

2. The transformer clamping nail insulation assembly structure according to claim 1, characterized in that: The upper outer side of the rivet washer (2) is provided with an upper rounded corner (202) and the lower outer side is provided with a lower rounded corner (203). The insulating layer (3) forms a first insulating layer rounded corner segment (301) and a second insulating layer rounded corner segment (302) connected sequentially from the inside to the outside, corresponding to the position of the upper rounded corner (202) of the rivet washer. The insulating layer (3) forms a third insulating layer rounded corner segment (303) corresponding to the position of the lower rounded corner (203) of the rivet washer.

3. The transformer clamping nail insulation assembly structure according to claim 2, characterized in that: After the underside of the rivet washer (2) and the welding line (4) are ground flat, the insulating layer (3) is formed by coating the remaining part of the outside of the rivet washer (2) with pulp.

4. The transformer clamping nail insulation assembly structure according to claim 1, characterized in that: The pressure pin (1) includes a threaded section (103), a limiting section (102), and a plug-in section (101) arranged in sequence with their diameters decreasing sequentially.

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