Novel pressing plate structure

Abstract

The utility model provides a novel pressing plate structure which comprises a pressing plate, the pressing plate comprises a first pressing plate, a second pressing plate and a third pressing plate, and the first pressing plate, the second pressing plate and the third pressing plate are respectively installed at three-phase positions of a three-phase power transformer. The parts, close to each other, of the upper surfaces of the first pressing plate and the second pressing plate and the parts, close to each other, of the upper surfaces of the second pressing plate and the third pressing plate are each provided with a pressing groove. The structural design is optimized, the material cost is greatly saved, the overall size of an iron core is reduced, the overall size of an oil tank is reduced, and the use amount of silicon steel sheets and steel is reduced; an auxiliary pressing plate structure is omitted, the use amount of laminated wood is saved, the mechanical strength of the pressing plate is improved, the pressing plate is thickened to 70 mm in thickness, the mechanical strength of the pressing plate is improved, the pressing plate is prevented from being bent due to insufficient mechanical strength in the pressing process, the assembly time is shortened, the position of the auxiliary pressing plate does not need to be adjusted, and the assembly time can be saved.

Description

Technical Field

[0001] This utility model relates to the field of three-phase power transformer installation, and in particular to a novel pressure plate structure. Background Technology

[0002] In the structure of a power transformer, the iron core serves as the frame, acting as the medium for energy conversion, while the coils, as the electrical circuit for the input and output of electrical energy, are the core component of the transformer. Insulation is maintained between the coils and the iron core, and sufficient energized distance is ensured through structures such as pressure plates and blocks, which also serve to compress the coils. Typically, the upper structure of a 110kV three-phase power transformer consists of windings, upper insulation, pressure plates, and auxiliary pressure plates (such as...). Figure 1 Using jacks to press the core body tightly, pressure blocks are placed under the limb plates of the core web. Adjustments are made according to the actual situation to ensure that the limb plates remain pressed against the core body after releasing the jack pressure. The pressure plate is generally 50mm thick and serves to hold the entire winding in place while ensuring sufficient electrical clearance. A 20mm adjustment margin is left between the pressure plate and the lower end of the upper yoke of the core. (See the pressure plate structure diagram...) Figure 2 The inner diameter 'a' of the pressure plate is the inner diameter of the inner coil + 4mm, and the outer diameter 'A' of the pressure plate is the outer diameter of the outermost coil - (5-10)mm. A secondary pressure plate is set at the top of the pressure plate, with a thickness of 40mm. The positioning dimension 'D' is the distance from the center of the device body to the inner surface of the web + 5mm, and the outer diameter 'A' is the outer diameter of the outermost coil - (5-10)mm. The secondary pressure plate serves to fill the height gap between the web and the pressure plate. The structure diagram of the secondary pressure plate is shown in the figure below. Figure 3 The traditional power transformer body structure has certain design waste, requiring the use of auxiliary pressure plates to fill the height gap, resulting in a relatively high overall core height and thus wasting material costs. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the aforementioned problems in the prior art, this utility model provides a novel pressure plate structure.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A novel pressure plate structure includes a pressure plate, wherein the pressure plate includes a first pressure plate, a second pressure plate, and a third pressure plate;

[0008] The first pressure plate, the second pressure plate, and the third pressure plate are respectively installed at the three-phase positions of the three-phase power transformer;

[0009] Pressure grooves are provided on the upper surfaces of the first and second pressure plates that are close to each other, as well as on the upper surfaces of the second and third pressure plates that are close to each other.

[0010] Preferably, the pressure groove is a two-stage stepped groove, and the groove depth and width match the steps on the lower end face of the yoke on the iron core.

[0011] Preferably, the depth of the first-stage groove is 40mm, and the difference between the width of the first-stage groove and the width of the first stage of the lower end face of the iron yoke on the core is 20mm.

[0012] Preferably, the depth of the second-stage groove is 20mm, and the difference between the width of the second-stage groove and the width of the second stage of the lower end face of the iron core yoke is 20mm.

[0013] Preferably, the thickness of the first pressure plate, the second pressure plate, and the third pressure plate is 70mm.

[0014] Preferably, the upper surfaces of the first pressure plate, the second pressure plate, and the third pressure plate are each provided with two pressure blocks arranged symmetrically from left to right. The pressure blocks are connected to the web plates through limb plates, and the iron yoke on the iron core is installed between the two web plates.

[0015] Preferably, the first pressure plate, the second pressure plate, and the third pressure plate are all disposed above the winding.

[0016] (III) Beneficial Effects

[0017] The beneficial effects of this utility model are as follows: By adopting the above technical solution, this application optimizes the structural design, greatly saves material costs, reduces the overall size of the iron core, and reduces the overall size of the oil tank, thereby reducing the amount of silicon steel sheets and steel used; and by eliminating the sub-pressure plate structure, the amount of laminated wood used is saved, the mechanical strength of the pressure plate is improved, and the thickness of the pressure plate is increased to 70mm, which improves the mechanical strength of the pressure plate and prevents the pressure plate from bending due to insufficient mechanical strength during the pressing process. It also reduces assembly time. Without the sub-pressure plate structure, the time for arranging the sub-pressure plate laminated wood during the assembly process can be saved, and there is no need to adjust the position of the sub-pressure plate, which can save assembly time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a traditional power transformer in the background art;

[0019] Figure 2 This is a schematic diagram of the pressure plate structure of a traditional power transformer in the background art;

[0020] Figure 3 This is a schematic diagram of the secondary pressure plate structure of a traditional power transformer in the background art;

[0021] Figure 4 This is a schematic diagram of the structure of the power transformer of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the first pressure plate, the second pressure plate, and the third pressure plate of this utility model;

[0023] Figure 6 This is a side view of the pressure plate of this utility model.

[0024] [Explanation of Labels in the Attached Image]

[0025] 1. Winding;

[0026] 2. Pressure plate; 21. First pressure plate; 22. Second pressure plate; 23. Third pressure plate; 24. Pressure groove;

[0027] 3. Pressing blocks;

[0028] 4. Limb plates;

[0029] 5. Web;

[0030] 6. Iron core with iron yoke;

[0031] 7. Secondary pressure plate. Detailed Implementation

[0032] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Please refer to Figures 4 to 6 This utility model provides a novel pressure plate structure, including a pressure plate 2, wherein the pressure plate includes a first pressure plate 21, a second pressure plate 22 and a third pressure plate 23;

[0034] The first pressure plate 21, the second pressure plate 22 and the third pressure plate 23 are respectively installed at the three-phase positions of the three-phase power transformer;

[0035] Pressure grooves 24 are provided on the upper surfaces of the first pressure plate 21 and the second pressure plate 22 that are close to each other, as well as on the upper surfaces of the second pressure plate 22 and the third pressure plate 23 that are close to each other.

[0036] Compared to the original structure, this application shortens the distance from the lower end face of the yoke 6 on the core to the upper end face of the insulation on the winding 1 by 20mm, i.e., the core window height is shortened by 20mm. This application optimizes the structural design, greatly saves material costs, reduces the overall size of the core, and reduces the overall size of the oil tank, thus reducing the amount of silicon steel sheets and steel used. Furthermore, the secondary pressure plate 7 structure is eliminated, saving the amount of laminated wood used, improving the mechanical strength of the pressure plate, and increasing the thickness of the pressure plate to 70mm, thereby improving the mechanical strength of the pressure plate and preventing it from bending due to insufficient mechanical strength during the clamping process. It also reduces assembly time. Without the secondary pressure plate 7 structure, the time for arranging the laminated wood of the secondary pressure plate 7 during the assembly process can be saved, and there is no need to adjust the position of the secondary pressure plate 7, which can save assembly time.

[0037] In this embodiment, the pressure groove 24 is a two-stage stepped groove, and the groove depth and width of the pressure groove 24 match the steps on the lower end face of the iron yoke 6 on the iron core.

[0038] In this embodiment, the depth of the first-stage groove of the pressure groove 24 is 40mm, and the difference between the width of the first-stage groove of the pressure groove 24 and the width of the first stage of the lower end face of the iron yoke 6 on the iron core is 20mm.

[0039] In this embodiment, the depth of the second-stage groove of the pressure groove 24 is 20mm, and the difference between the width of the second-stage groove of the pressure groove 24 and the width of the second stage of the lower end face of the iron yoke 6 on the iron core is 20mm.

[0040] In this embodiment, the thickness of the first pressure plate 21, the second pressure plate 22, and the third pressure plate 23 is 70mm.

[0041] In this embodiment, the upper surfaces of the first pressure plate 21, the second pressure plate 22, and the third pressure plate 23 are each provided with two pressure blocks 3 arranged symmetrically from left to right. The pressure blocks 3 are connected to the web plates 5 through the limb plates 4, and the iron core yoke 6 is installed between the two web plates 5.

[0042] In this embodiment, the first pressure plate 21, the second pressure plate 22 and the third pressure plate 23 are all disposed above the winding 1.

[0043] Compared to the original structure, this application shortens the distance from the lower end face of the yoke 6 on the core to the upper end face of the insulation on the winding 1 by 20mm, i.e., the core window height is shortened by 20mm. This application optimizes the structural design, greatly saves material costs, reduces the overall size of the core, and reduces the overall size of the oil tank, thus reducing the amount of silicon steel sheets and steel used. Furthermore, the secondary pressure plate 7 structure is eliminated, saving the amount of laminated wood used, improving the mechanical strength of the pressure plate, and increasing the thickness of the pressure plate to 70mm, thereby improving the mechanical strength of the pressure plate and preventing it from bending due to insufficient mechanical strength during the clamping process. It also reduces assembly time. Without the secondary pressure plate 7 structure, the time for arranging the laminated wood of the secondary pressure plate 7 during the assembly process can be saved, and there is no need to adjust the position of the secondary pressure plate 7, which can save assembly time.

[0044] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0045] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel pressure plate structure, characterized in that, Includes a pressure plate, wherein the pressure plate includes a first pressure plate, a second pressure plate, and a third pressure plate; The first pressure plate, the second pressure plate, and the third pressure plate are respectively installed at the three-phase positions of the three-phase power transformer; Pressure grooves are provided on the upper surfaces of the first and second pressure plates that are close to each other, as well as on the upper surfaces of the second and third pressure plates that are close to each other.

2. The novel pressure plate structure according to claim 1, characterized in that, The pressure groove is a two-stage stepped groove, and the groove depth and width match the steps on the lower end face of the iron yoke on the iron core.

3. The novel pressure plate structure according to claim 2, characterized in that, The depth of the first stage of the pressure groove is 40mm, and the difference between the width of the first stage of the pressure groove and the width of the first stage of the lower end face of the iron yoke on the iron core is 20mm.

4. The novel pressure plate structure according to claim 3, characterized in that, The depth of the second-stage groove is 20mm, and the difference between the width of the second-stage groove and the width of the second stage of the lower end face of the iron yoke on the iron core is 20mm.

5. The novel pressure plate structure according to claim 1, characterized in that, The thickness of the first pressure plate, the second pressure plate, and the third pressure plate is 70mm.

6. The novel pressure plate structure according to claim 1, characterized in that, The upper surfaces of the first pressure plate, the second pressure plate, and the third pressure plate are each provided with two pressure blocks arranged symmetrically from left to right. The pressure blocks are connected to the web plates through limb plates, and the iron yoke on the iron core is installed between the two web plates.

7. The novel pressure plate structure according to claim 1, characterized in that, The first pressure plate, the second pressure plate, and the third pressure plate are all positioned above the winding.

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