Electrical equipment with heating and resistance reducing functions

Abstract

The utility model discloses power equipment with heating and resistance reducing functions, which relates to the technical field of transformer terminals and comprises a bolt, a nut, a nanometer filling metal sheet, a memory alloy gasket, a flat gasket and a terminal plate. According to the utility model, when the temperature rises, the memory alloy gasket is matched to automatically output pressure to enable the two terminal plates to be tightly attached, and at the moment, the nanometer filling metal sheet is liquefied to be automatically filled in a gap between the terminal plates to form a conductive layer, so that the conductive efficiency between the metal plates is improved; through the characteristics of the memory alloy gasket, the temperature rises to automatically output pressure so as to realize close contact, the contact surface of the terminal board is increased, the resistance is reduced, and the purpose of self-healing cooling of a heating point is achieved. And the used titanium alloy bolt has excellent high-temperature resistance, strong electromagnetic environment resistance and corrosion resistance and has high strength superior to that of carbon steel, and the bolt cannot be loosened due to corrosion or thermal expansion due to the extremely high stability of the titanium alloy bolt.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer terminals, in particular to an electric power device with heating and resistance reduction functions. Background Art

[0002] The high and low voltage side terminals of the main transformer in the substation are often connected with galvanized bolts. During long-term operation, the terminals are generally made of copper or aluminum. When the ambient temperature drops or the current passing through the terminals decreases, the expansion coefficient of copper and aluminum is greater than that of the bolts, so the terminals will shrink and deform more than the bolts and nuts, resulting in a gap between the terminals and the nuts. The squeezing force of the nuts on the terminal surfaces is reduced, and the contact surfaces between the two terminals cannot be in close contact, resulting in increased resistance. The increased resistance will cause severe heating and increased deformation when power is applied, further leading to misalignment between the terminals. In addition, the temperature increase will cause the contact surfaces of the terminals to oxidize, destroying the original direct contact of the metal surfaces of the terminals. The formation of oxide film will increase the contact resistance. This vicious cycle seriously affects the safe operation of the equipment.

[0003] The problems described above are generally solved using conductive paste, which is generally composed of mineral oil, synthetic grease, conductive filler, antioxidant, etc.; among them, the conductive filler is usually metal powder (such as silver powder, copper powder, etc.) or graphite, which can provide good conductive properties; mineral oil and synthetic grease play a lubricating and protective role, preventing the conductive filler from oxidation and moisture; antioxidants can extend the service life of the conductive paste.

[0004] Although conductive paste can temporarily reduce contact resistance, it has a shelf life. After the expiration date, it will lose its original conductive properties and even produce adverse reactions; deterioration or damage: the conductive paste will have odor, color change, dryness or caking, etc., making it difficult to clean and inconvenient to repair, etc. Utility Model Content

[0005] The purpose of the present utility model is to provide an electric power device with heat generation and resistance reduction functions, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: an electric power equipment with heat generation and resistance reduction functions, comprising a transformer body, a plurality of wiring terminals are provided on the top of the transformer body, a bolt is provided on the top of the wiring terminal, a matching sleeve on the outer wall of the bolt is provided with a nut, a nano-filled metal sheet, a memory alloy gasket, two flat washers and a terminal plate, the two terminal plates are provided between the two flat washers, the nano-filled metal sheet is provided between the two terminal plates, and the memory alloy gasket is provided between the nut and the flat washer.

[0007] Furthermore, the top center of the memory alloy gasket is designed to be convex.

[0008] Furthermore, the top center of the memory alloy gasket is designed as a truncated cone protrusion, and the cross section of the memory alloy gasket is an isosceles trapezoidal structure.

[0009] Furthermore, the bolts, nuts and flat washers are all made of titanium alloy materials, and the memory alloy gasket is made of one-way memory alloy material.

[0010] Furthermore, a sleeve insulator is sleeved on the outer wall of the wiring terminal, the bolt is arranged above the sleeve insulator, and the nut is arranged on the outer wall of the bolt away from the end of the wiring terminal.

[0011] Furthermore, first anti-slip patterns are provided on both sides of the outer wall of the flat pad, and second anti-slip patterns are provided on both sides of the outer wall of the flat pad inside the first anti-slip patterns.

[0012] Furthermore, the first anti-shedding pattern and the second anti-shedding pattern each include a plurality of arcuate stripes, and a circular stripe is provided at one end of the arcuate stripe.

[0013] Furthermore, the arcuate stripes are arranged in a circular spiral on the surface of the flat pad, and the arcuate stripes of the first anti-slip pattern and the second anti-slip pattern are arranged in opposite directions.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0015] The utility model is provided with bolts, nuts, nano-filled metal sheets, memory alloy washers, flat washers and terminal boards. The nano-filled metal sheets replace the traditional conductive glue to increase the conductive efficiency of the terminal. When the temperature rises, the memory alloy washers automatically output pressure to make the two terminal boards fit tightly together. At this time, the nano-filled metal sheets will liquefy and automatically fill the gap between the terminal boards to form a conductive layer, thereby improving the conductive efficiency between the metal plates. As the operating cycle lengthens, the creep coefficients of the upper and lower terminal boards are different, which will produce gaps. The nano-filled metal sheets are driven by electric ions to automatically fill the gaps between the terminal boards with metal ions. The nano-filled metal sheets themselves are metal and can be used in relatively low operating environments. When it is in solid state, the conductive layer formed after filling the gap is equivalent to a protective film, which can automatically isolate air and rainwater from penetrating between the terminal boards to cause interface oxidation, and avoid the formation of an oxide layer to increase resistance; nano-filled metal sheets can be used instead of traditional conductive glue on the high and low voltage side terminals of the main transformer in the substation to improve the conductivity efficiency of the equipment joints; and through the characteristics of the memory alloy gasket, the temperature rises and the pressure is automatically output to make it close contact, thereby increasing the contact area of the terminal board, reducing resistance, and achieving the purpose of self-healing cooling of the hot spot; and the titanium alloy bolts used have excellent resistance to high temperature, strong electromagnetic environment, and corrosion, and have high strength exceeding carbon steel. Its extremely high stability will not cause the bolts to loosen due to corrosion or thermal expansion.

[0016] In the present invention, the first anti-slip pattern is used to limit and prevent slipping at the outer edges on both sides of the outer wall of the flat gasket, and the second anti-slip pattern is used to limit and prevent slipping at the inner edges on both sides of the outer wall of the flat gasket. The first anti-slip pattern and the second anti-slip pattern on the surface of the flat gasket can be respectively used for double anti-slip treatment on both sides of the surface of the flat gasket, which can effectively improve the anti-loosening performance of the bolt, effectively ensure the connection stability of the bolt and the nut, and thus ensure the stability between the terminal boards; the arc stripes and the circular stripes realize two-level anti-slip limiting treatment of the flat gasket, which can effectively improve the anti-loosening performance of the flat gasket; the arc stripes are arranged in a ring spiral on the surface of the flat gasket, and the arc stripes of the first anti-slip pattern and the second anti-slip pattern are arranged in opposite directions, so that the contact force directions of the first anti-slip pattern and the second anti-slip pattern are opposite when subjected to force, which can effectively improve the anti-loosening treatment effect of the bolt and the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is the main view of the entire utility model;

[0019] Figure 2 This utility model Figure 1 A magnified schematic diagram of point A in the middle;

[0020] Figure 3 This utility model Figure 1 Schematic diagram of the cross section at point A;

[0021] Figure 4 This is a main cross-sectional view of the memory alloy gasket of the utility model;

[0022] Figure 5 It is a top view of the flat pad of the utility model;

[0023] Figure 6 This is a working diagram of the memory alloy gasket of the utility model;

[0024] In the figure: 1. Transformer body; 2. Terminal block; 3. Bolt; 4. Nut; 5. Nano-filled metal sheet; 6. Memory alloy gasket; 7. Flat gasket; 8. Terminal board; 9. Bushing insulator; 10. First anti-slip pattern; 11. Second anti-slip pattern; 12. Arc stripes; 13. Circular stripes. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1-6 The utility model provides a technical solution: an electric power device with heat generation and resistance reduction function, comprising a transformer body 1, a plurality of wiring terminals 2 are provided on the top of the transformer body 1, a bolt 3 is provided on the top of the wiring terminal 2, a nut 4, a nano-filled metal sheet 5, a memory alloy gasket 6, two flat washers 7 and a terminal plate 8 are matched with the outer wall of the bolt 3, the two terminal plates 8 are provided between the two flat washers 7, the nano-filled metal sheet 5 is provided between the two terminal plates 8, the memory alloy gasket 6 is provided between the nut 4 and the flat washers 7; the top of the memory alloy gasket 6 The center is a truncated cone convex design, and the cross-section of the memory alloy gasket 6 is an isosceles trapezoidal structure; a first anti-slip pattern 10 is provided on both sides of the outer wall of the flat gasket 7, and a second anti-slip pattern 11 is provided on both sides of the outer wall of the flat gasket 7 inside the first anti-slip pattern 10; the first anti-slip pattern 10 and the second anti-slip pattern 11 each include a plurality of arc stripes 12, and a circular stripe 13 is provided at one end of the arc stripe 12; the arc stripe 12 is arranged in a circular spiral on the surface of the flat gasket 7, and the arc stripes 12 of the first anti-slip pattern 10 and the second anti-slip pattern 11 are arranged in opposite directions.

[0027] The nano-filled metal sheet 5 comprises the following chemical compositions, in weight percentage: 43.65% lead (Pb), 41.76% bismuth (Bi), 7.8% tin (Sn), 4.69% cadmium (Cd), and 2.1% silicon (Si);

[0028] Preparation method of nano-filled metal sheet 5

[0029] 1. First, place the lead in a specially made high-temperature resistant crucible and heat it to its melting point (approximately 327.5°C) using a heating device to completely melt it.

[0030] 2. After the lead is completely melted, slowly add the previously prepared bismuth (melting point 271.3°C); during the addition process, stir continuously to ensure that the bismuth is evenly distributed in the lead liquid;

[0031] 3. Then add tin (melting point 231.9°C) and continue stirring to mix the metals thoroughly;

[0032] 4. Finally, add cadmium (melting point 320.9°C) and silicon; continue stirring to ensure the metals are thoroughly mixed.

[0033] 5. Adjust the heating temperature to an appropriate value to further blend the mixture and remove any bubbles and impurities that may exist;

[0034] 6. Once the mixture is homogeneous and pure, stop heating and allow it to cool slowly in a controlled environment;

[0035] 7. The cooled mixture (nano-filled metal flakes 5) has the characteristics of being soft, flaky, liquid silver, and meltable when heated and solid after returning to room temperature;

[0036] The nano-filled metal sheet 5 is in the shape of a sheet with an indefinite length and a width of 15 to 20 mm, and can be cut according to needs.

[0037] The bolts 3, nuts 4 and flat washers 7 are all made of titanium alloy. The material used in the bolt kit is titanium alloy. Titanium alloy bolts have the characteristics of high strength, corrosion resistance, lightweight, non-toxic and non-magnetic. In addition, titanium alloy fasteners have strong corrosion resistance under various high temperature conditions; the memory alloy gasket 6 is made of one-way memory alloy material; in order to solve the problem of increased contact resistance caused by loose joints, a memory alloy gasket is made according to the principle of one-way memory alloy, that is, shape memory alloy can restore its shape before deformation after heating.

[0038] The outer wall of the terminal block 2 is sleeved with a sleeve insulator 9, the bolt 3 is arranged above the sleeve insulator 9, and the nut 4 is arranged at the end of the outer wall of the bolt 3 away from the terminal block 2, so that the nut 4 is located above all parts of the outer wall of the bolt 3, which is convenient for installation and disassembly operations.

[0039] The working principle of this utility model:

[0040] Refer to the instruction manual Figures 1-6 The utility model provides bolts 3, nuts 4, nano-filled metal sheets 5, memory alloy washers 6, flat washers 7 and terminal boards 8. The nano-filled metal sheets 5 replace the traditional conductive glue to improve the conductive efficiency of the terminal. When the temperature rises, the memory alloy washers 6 automatically output pressure to make the two terminal boards 8 fit tightly together. At this time, the nano-filled metal sheets 5 will liquefy and automatically fill the gaps between the terminal boards 8 to form a conductive layer, thereby improving the conductive efficiency between the metal plates. As the operating cycle lengthens, the creep coefficients of the upper and lower terminal boards 8 are different, which will produce gaps. The nano-filled metal sheets 5 are driven by electric ions to automatically fill the gaps between the terminal boards 8 with metal ions. The nano-filled metal sheets 5 are metal themselves and are in a solid state when the operating environment temperature is relatively low. The conductive layer formed after filling the gaps is equivalent to a protective film, which can automatically isolate air and rainwater from penetrating between the terminal boards 8 to cause interface oxidation, thereby avoiding the formation of an oxide layer that increases resistance.

[0041] Before installation, the memory alloy gasket 6 is convex in the middle compared with ordinary flat gaskets, and is trapezoidal in shape when viewed from the side; during installation, the memory alloy gasket 6 is tightened by the nut 4 and squeezed into a flat state. At this time, the memory alloy gasket 6 is squeezed into the same shape as a flat gasket; during use, as the temperature rises, the memory alloy gasket 6 will return to its original state, that is, the trapezoidal state. However, at this time, the memory alloy gasket 6 is constrained by the nut 4 and does not deform. It only outputs a restoring force, which is applied to the nut 4 and the terminal 2, so that the terminal board is tightly locked, increasing the tightening force and reducing the contact resistance, thereby reducing the temperature of the terminal;

[0042] By placing the nano-filled metal sheet 5 between the two terminal plates 8, the self-healing cooling effect can be achieved; in order to fully exert its effect, it is also necessary to use it together with the memory alloy gasket 6 and the titanium alloy bolt. The nano-filled metal sheet 5 is a metal that will liquefy when heated but is solid at room temperature. When the solid sheet-like nano-filled metal sheet 5 is placed between the two terminal plates 8, and the two plates are tightened with the memory alloy gasket 6 and the titanium alloy bolt, the nano-filled metal sheet 5 is now installed. Thereafter, when the contact head becomes hot during operation, the nano-filled metal sheet 5 will liquefy when heated. At this time, the liquid paste-like nano-filled metal sheet 5 will fill the gap between the two terminal plates 8, thereby increasing the contact area between the two terminal plates 8 and reducing the contact resistance between the two terminal plates 8. The lower the resistance between the two terminal plates 8, the lower the temperature will be, thereby achieving one of the purposes of self-healing cooling. At this time, due to the temperature reduction , the nano-filled metal will remain solidified as it is. At this time, the gap between the two terminal boards 8 is also filled, and rainwater cannot penetrate through it, which also solves the problem of oxidation between the two boards. The nano-filled metal sheet 5 can self-heal and cool down after long-term use, freeing the hands of the maintenance personnel, and will not oxidize. Even if used for a long time, the effect is still very good; the effect of the matching memory alloy gasket 6 is to increase the pressure between the two terminal boards 8. During installation, the memory alloy gasket 6 is convex and arched. During installation, the nut 4 is screwed until the memory alloy gasket 6 becomes flat. At this time, the shape of the memory alloy gasket 6 is changed, but when the terminal board heats up, the memory alloy gasket 6 will return to its original shape, that is, the arch shape, due to the heat, it will always output a restoring force to keep the bolt in a tightened state. Therefore, there will be no loosening between the two terminal boards 8 and no gaps will be generated. The matching titanium alloy bolts replace traditional bolts, which can reduce the oxidation of the bolts and are more durable.

[0043] Nano-filled metal sheets 5 can be used instead of traditional conductive adhesives at the high- and low-voltage side terminals of the main transformer in the substation to improve the conductivity of the equipment joints. Thanks to the characteristics of the memory alloy gasket 6, pressure is automatically output when the temperature rises to achieve close contact, increasing the contact surface of the terminal plate 8 and reducing resistance, thereby achieving self-healing cooling at the hot spot. Furthermore, the titanium alloy bolts used have excellent resistance to high temperatures, strong electromagnetic environments, and corrosion, and have a high strength that exceeds that of carbon steel. Their extremely high stability will prevent the bolts from loosening due to corrosion or thermal expansion.

[0044] The first anti-slip pattern 10 is limited and prevented from slipping at the outer edges on both sides of the outer wall of the flat gasket 7, and the second anti-slip pattern 11 is limited and prevented from slipping at the inner edges on both sides of the outer wall of the flat gasket 7. The first anti-slip pattern 10 and the second anti-slip pattern 11 on the surface of the flat gasket 7 can perform double anti-slip treatment on both sides of the flat gasket surface respectively, which can effectively improve the anti-loosening performance of the bolt 3, and can effectively ensure the connection stability of the bolt 3 and the nut 4, and thus ensure the stability between the terminal boards 8; the arc stripes 12 and the circular stripes 13 realize two-stage anti-slip limiting treatment of the flat gasket 7, which can effectively improve the anti-loosening performance of the flat gasket 7; the arc stripes 12 are arranged in a ring spiral on the surface of the flat gasket 7, and the arc stripes 12 of the first anti-slip pattern 10 and the second anti-slip pattern 11 are arranged in opposite directions, so that the contact force directions of the first anti-slip pattern 10 and the second anti-slip pattern 11 are opposite when subjected to force, which can effectively improve the anti-loosening treatment effect of the bolt 3 and the nut 4.

[0045] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electric power device with heat generation and resistance reduction function, comprising a transformer body (1), characterized in that: The transformer body (1) is provided with a plurality of connection terminals (2) on the top, the connection terminals (2) are provided with bolts (3) on the top, the outer wall of the bolts (3) is provided with a matching sleeve with nuts (4), nano-filled metal sheets (5), memory alloy washers (6), two flat washers (7) and a terminal plate (8), the two terminal plates (8) are provided between the two flat washers (7), the nano-filled metal sheets (5) are provided between the two terminal plates (8), and the memory alloy washers (6) are provided between the nuts (4) and the flat washers (7).

2. The electric power equipment with heat generation and resistance reduction function according to claim 1, characterized in that: The top center of the memory alloy gasket (6) is designed to be convex.

3. The electric power equipment with heat generation and resistance reduction function according to claim 2, characterized in that: The top center of the memory alloy gasket (6) is designed as a truncated cone protrusion, and the cross section of the memory alloy gasket (6) is an isosceles trapezoidal structure.

4. The electric power equipment with heat generation and resistance reduction function according to claim 1, characterized in that: The bolt (3), nut (4) and flat washer (7) are all made of titanium alloy material, and the memory alloy washer (6) is made of one-way memory alloy material.

5. The electric power equipment with heat generation and resistance reduction function according to claim 1, characterized in that: The outer wall of the terminal block (2) is sleeved with a sleeve insulator (9), the bolt (3) is arranged above the sleeve insulator (9), and the nut (4) is arranged at an end of the outer wall of the bolt (3) away from the terminal block (2).

6. The electric power equipment with heat generation and resistance reduction function according to claim 1, characterized in that: First anti-slip patterns (10) are provided on both sides of the outer wall of the flat pad (7), and second anti-slip patterns (11) are provided on both sides of the outer wall of the flat pad (7) inside the first anti-slip patterns (10).

7. The electric power equipment with heat generation and resistance reduction function according to claim 6, characterized in that: The first anti-slip pattern (10) and the second anti-slip pattern (11) each comprise a plurality of arcuate stripes (12), and a circular stripe (13) is provided at one end of the arcuate stripe (12).

8. The electric power equipment with heat generation and resistance reduction function according to claim 7, characterized in that: The arcuate stripes (12) are arranged in a circular spiral on the surface of the flat washer (7), and the arcuate stripes (12) of the first anti-slip pattern (10) and the second anti-slip pattern (11) are arranged in opposite directions.

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