Cushion block pouring mold for 110kV dry-type transformer

Abstract

The utility model relates to the technical field of transformer cushion blocks, and provides a 110kV dry-type transformer cushion block pouring mold which comprises a top plate, a bottom plate, a front plate and two side plates. The top plate is provided with a filling port; a first bottom surface, a second bottom surface and a partition are sequentially arranged at the bottom of the top plate; an overhanging extension part is arranged between the first bottom surface and the front plate at the bottom of the top plate; a third bottom surface is arranged at the bottom of the overhanging extension part, and a vertical concave part is arranged on the third bottom surface; the third bottom face is lower than the bottom of the partition plate. Castable is injected into the die cavity through the injection port in the top plate, the whole die cavity can be filled with the castable, and the forming quality of the cushion block is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer pads, and in particular relates to a casting mould for a 110kV dry-type transformer pad. Background Art

[0002] Existing transformer pads are generally molded parts, but for 110kV dry-type transformer pads, considering the pressure resistance between the iron core and the low-voltage coil, the structure of the pads needs to be optimized, and the traditional hot-pressed pads can no longer meet product requirements. The patent with publication number CN106426691A discloses a pad casting mold, which adopts a casting process to prepare the pads. Compared with the traditional hot-pressing molding process, it can be applied to more non-standard products. However, the mold cavity of the casting mold is formed by the base plate and the side plate, and the partition is installed in the groove of the base plate by inserting the installation method, so as to form a slot for installing the insulating tube on the cast-molded pad. The partition of the mold adopts an assembled structure, and the installation accuracy is poor, resulting in poor product molding quality. In addition, the top of the mold cavity of the mold does not adopt a closed structure, and the liquid level of the casting material is only controlled by the guide hole. In fact, the platform for installing high and low voltage coils and the bottom of the slot for installing the insulating cylinder of the existing commonly used dry-type transformer spacers are not on the same horizontal plane. For example, the patent with publication number CN219202904U discloses a dry-type transformer insulating spacer adopting the above structure. For this type of transformer spacer, the above mold does not have a top plate, and only has guide holes on the side plate to control the liquid level of the casting material. Obviously, it is no longer applicable. Therefore, a new mold for casting insulating spacers of 110kV dry-type transformers is needed. Utility Model Content

[0003] In response to the above-mentioned problems in the prior art, the present application proposes a 110kV dry-type transformer gasket casting mold, in which an injection port is arranged on the top plate, and the entire mold is placed in a negative pressure or vacuum environment. The casting material can fill the mold cavity, thereby improving the gasket molding quality. At the same time, through the configuration of the bottom surface of the top plate at different heights, the cast gasket has platforms and slots at different heights, thereby solving the problem that the gaskets produced by the existing mold are not suitable for 110kV dry-type transformers.

[0004] The utility model proposes a 110kV dry-type transformer gasket casting mold, comprising a top plate, a bottom plate, a front plate and two side plates; the front plate is connected to the two side plates to form a vertically through mold cavity; the inner wall of the side plate is provided with a horizontal recessed portion; the bottom plate is closed at the bottom of the mold cavity, and is respectively connected to the front plate and the two side plates; the top plate is closed at the top of the mold cavity, and is connected to the two side plates; the top plate is provided with a material injection port connected to the mold cavity; the bottom of the top plate is provided with a first bottom surface, a second bottom surface and a partition in sequence; the partition is located between the first bottom surface and the second bottom surface; the bottom of the top plate is provided with a hanging extension portion between the first bottom surface and the front plate; the bottom of the hanging extension portion is provided with a third bottom surface, and the third bottom surface is provided with a vertical recessed portion; the height of the third bottom surface is lower than the bottom height of the partition.

[0005] Furthermore, the bottom of the top plate is located between the first bottom surface and the second bottom surface, and a fourth bottom surface is also provided; the top of the partition is located at the fourth bottom surface; and the setting height of the first bottom surface and / or the second bottom surface is located between the fourth bottom surface and the bottom of the partition.

[0006] Furthermore, there are a plurality of partitions, and the plurality of partitions are arranged at intervals.

[0007] Furthermore, the top plate is provided with air holes communicating with the mold cavity; the air holes are distributed between the partitions.

[0008] Furthermore, threaded lifting holes are provided on the top plate.

[0009] Furthermore, the top plate is provided with an observation port communicating with the mold cavity.

[0010] Furthermore, the injection port passes through the first bottom surface; and the observation port passes through the second bottom surface.

[0011] Furthermore, the front plate and the two side plates surround and clamp the top plate.

[0012] Furthermore, the mating end surfaces of the two side panels and the mating end surfaces of the side panel and the front panel are provided with a first sealing groove; the front panel and the two side panels enclose and clamp the four sides of the bottom panel; the four sides of the bottom panel are provided with a second sealing groove, and the second sealing groove is connected with the first sealing groove; and sealing strips are provided in the first sealing groove and the second sealing groove.

[0013] Furthermore, a positioning protrusion is provided on the top of the bottom plate.

[0014] Furthermore, it also includes a vacuum container; the 110kV dry-type transformer pad casting mold is located in the vacuum container.

[0015] The beneficial effects of the utility model are as follows: a closed mold cavity is formed by enclosing a top plate, a bottom plate, a front plate and two side plates, and overhanging extensions, vertical recessed portions and partitions of different heights are arranged at the bottom of the top plate, and the casting material is injected into the mold cavity through the injection port on the top plate to fill the entire mold cavity, and the outer contour surface molding quality of the pad is high; and the overhanging extension, the partition and the top plate are an integrated structure, and no separate assembly and disassembly are required, and the contour surface molding quality of the card slot of the pad for installing the insulating cylinder is high, especially the pad can form a plurality of planes of different heights for installing high and low voltage coils and insulating cylinders, which is suitable for producing 110kV dry-type transformer pads; in addition, excess casting material can overflow from the injection port, and in this process, the casting material can fill the space below the bottom plate in the mold cavity, and the platform of the produced pad has good flatness, and there will be no shortage of material, which further improves the molding quality of the pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model 110kV dry-type transformer spacer casting mold after the front plate and the top plate are separated.

[0017] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the top plate, a side plate and a cast-formed pad.

[0018] Figure 3 for Figure 2 Schematic diagram of the structure after the middle pad is hidden.

[0019] Figure 4 for Figure 1 Schematic diagram of the structure after the two side panels are enclosed.

[0020] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of the middle top plate.

[0021] Figure 6 for Figure 5 Schematic diagram of the main structure of the top plate.

[0022] Figure 7 for Figure 6 Schematic diagram of the top view structure.

[0023] Figure 8 for Figure 6 Schematic diagram of the structure viewed from above.

[0024] Fig. 9 The utility model is a schematic diagram of the three-dimensional structure of a gasket block cast by a casting mold for a 110kV dry-type transformer gasket block.

[0025] In the figure, 10-top plate; 11-injection port; 12-observation port; 13-air hole; 14-threaded lifting hole; 15-overhang extension; 16-vertical recessed portion; 17-first bottom surface; 18-second bottom surface; 19-third bottom surface; 110-fourth bottom surface; 111-partition plate; 20-bottom plate; 21-positioning protrusion; 22-second sealing groove; 30-front plate; 40-side plate; 41-horizontal recessed portion; 42-first sealing groove; 50-mounting hole; 60-pad body; 61-first card slot; 62-second card slot. DETAILED DESCRIPTION

[0026] The following is combined with Figures 1 to 9 The utility model is further described in detail with specific embodiments.

[0027] like Figure 1 , Figure 2 , Figure 3 The 110 kV dry-type transformer spacer casting mold shown includes a top plate 10 , a bottom plate 20 , a front plate 30 and two side plates 40 .

[0028] The front plate 30 and the two side plates 40 are connected to form a vertically penetrating mold cavity; the inner wall of the side plate 40 is provided with a horizontal recessed portion 41; the inner wall of each side plate 40 is provided with a plurality of horizontal recessed portions 41 along the height direction, and the horizontal recessed portions 41 are used for forming the umbrella skirt of the pad. The horizontal cross section of the side plate 40 is an L-shaped plate, and the short sides of the two side plates 40 are spliced ​​together, and the long sides are arranged oppositely to form a structure with a horizontal cross section of a U shape. After the two side plates 40 are spliced ​​together, the horizontal recessed portions 41 at the same horizontal height are connected one by one.

[0029] The front plate 30 is an arched plate structure arranged vertically.

[0030] The bottom plate 20 is enclosed at the bottom of the mold cavity and is respectively connected to the front plate 30 and the two side plates 40. A positioning protrusion 21 is provided on the top of the bottom plate 20, and the positioning protrusion 21 is used for forming the positioning groove at the bottom of the cushion block.

[0031] The top plate 10 is closed at the top of the mold cavity and connected to the two side plates 40; the front plate 30 and the two side plates 40 surround and clamp the four sides of the top plate 10, and similarly, the front plate 30 and the two side plates 40 surround and clamp the four sides of the bottom plate 20. In this embodiment, the top of the top plate 10 is in the same horizontal plane as the tops of the front plate 30 and the side plates 40, and the bottom of the bottom plate 20 is in the same horizontal plane as the bottoms of the front plate 30 and the side plates 40.

[0032] like Figure 1As shown, the front plate 30, the side plate 40, the top plate 10 and the bottom plate 20 are all provided with horizontal mounting holes 50, and the mounting holes 50 may be threaded holes. The mounting holes 50 of the side plate 40 in the horizontal direction include transverse mounting holes 50 and longitudinal mounting holes 50, wherein the transverse direction refers to the width direction of the side plate 40, and the longitudinal direction refers to the length direction of the side plate 40. The mounting holes 50 on the front plate 30 are aligned with the longitudinal mounting holes 50 on the side plate 40 and connected by bolts. The mounting holes 50 on the top plate 10 are aligned with the transverse mounting holes 50 in the upper area of ​​the side plate 40 and connected by bolts. The mounting holes 50 on the bottom plate 20 are aligned with the transverse mounting holes 50 in the lower area of ​​the side plate 40 and connected by bolts. Under the action of the above-mentioned mounting holes 50 and bolt connection, the front plate 30, the side plate 40, the top plate 10 and the bottom plate 20 are tightly connected as a whole.

[0033] In order to ensure the sealing performance, Figure 3 , Figure 4 As shown, the first sealing groove 42 is provided on the mating end faces of the two side panels 40 and the mating end faces of the side panels 40 and the front panel 30; the front panel 30 and the two side panels 40 surround and clamp the four sides of the bottom panel 20; the four sides of the bottom panel 20 are provided with the second sealing groove 22, which is connected to the first sealing groove 42; and sealing strips are provided in the first sealing groove 42 and the second sealing groove 22. Under the action of the sealing strips, the casting material is difficult to seep out.

[0034] like Figure 5-Figure 8 As shown, the top plate 10 is provided with an injection port 11 and an observation port 12 connected to the mold cavity; the bottom of the top plate 10 is provided with a first bottom surface 17, a second bottom surface 18 and a partition 111 in sequence; the partition 111 is located between the first bottom surface 17 and the second bottom surface 18; the injection port 11 passes through the first bottom surface 17; and the observation port 12 passes through the second bottom surface 18. The observation port 12 and the injection port 11 are respectively provided at the two ends of the top plate 10, so that the pouring condition in the mold cavity can be observed through the observation port 12. When the pouring material overflows from the observation port 12 and the injection port 11, the mold cavity is filled with the pouring material.

[0035] The top plate 10 is provided with a hanging extension portion 15 at the bottom between the first bottom surface 17 and the front plate 30. The hanging extension portion 15 and the top plate 10 are an integral structure. The hanging extension portion 15 is provided with a third bottom surface 19 at the bottom. The third bottom surface 19 is provided with a vertical recessed portion 16. The height of the third bottom surface 19 is lower than the bottom height of the partition 111. The inner wall of the vertical recessed portion 16 is an arc surface.

[0036] like Figure 6As shown, the bottom of the top plate 10 is located between the first bottom surface 17 and the second bottom surface 18, and a fourth bottom surface 110 is also provided; the top of the partition 111 is located at the fourth bottom surface 110; the setting height of the first bottom surface 17 and / or the second bottom surface 18 is located between the fourth bottom surface 110 and the bottom of the partition 111. There are multiple partitions 111, and the multiple partitions 111 are arranged at intervals. Figure 6 As shown, four partitions 111 are provided.

[0037] In this embodiment, Figure 6 The first bottom surface 17, the second bottom surface 18, the third bottom surface 19 and the fourth bottom surface 110 are all horizontal planes. The distances between the third bottom surface 19, the bottom of the partition 111, the fourth bottom surface 110 and the top of the top plate 10 are successively reduced. The first bottom surface 17 and the second bottom surface 18 are in the same horizontal plane, and the height of the first bottom surface 17 and the second bottom surface 18 is located between the bottom of the partition 111 and the fourth bottom surface 110.

[0038] The top plate 10 is provided with air holes 13 communicating with the mold cavity; the air holes 13 are distributed between the partitions 111. Due to the effect of the partitions 111, it is difficult to exhaust the air between the partitions 111. In order to ensure the casting quality of the space between the partitions 111, the air holes 13 are provided in the area between the partitions 111 of the top plate 10, so that the air in the space between the partitions 111 can be discharged through the air holes 13 during casting.

[0039] It should be noted that when the mold of this embodiment is being poured, the entire mold is placed in a negative pressure or vacuum environment, and then vacuum pouring is performed through the injection port 11. Since it is in a negative pressure or vacuum environment, the casting material can fill the mold cavity completely without hollowing, and the molding quality is better.

[0040] The top plate 10 is provided with threaded lifting holes 14. The threaded lifting holes 14 are distributed in four directions of the top plate 10 and are evenly and symmetrically arranged. During lifting, the lifting ring is tightened into the threaded lifting hole 14 through the stud, and then the lifting ring is connected with a wire rope, and the other end of the wire rope is connected to a crane, and the mold is lifted to a designated area by the crane.

[0041] After pouring is completed, when removing the mold, remove the bolts in the mounting holes 50, first remove the front plate 30, then separate the side plates 40, then pull out the top plate 10 upwards, and then separate the formed pad from the bottom plate 20. Fig. 9 The formed spacer is shown.

[0042] The 110kV dry-type transformer includes an iron core, a low-voltage coil and a high-voltage coil arranged from the inside to the outside; a low-voltage insulation cylinder is arranged between the iron core and the low-voltage coil, and a high-voltage insulation cylinder is arranged between the low-voltage coil and the high-voltage coil, thereby effectively avoiding insulation failure. However, the traditional gasket does not have a mounting groove for the low-voltage insulation cylinder, so it is not suitable for 110kV dry-type transformers.

[0043] The gasket of this embodiment is different from the traditional gasket. The gasket of this embodiment includes a gasket body 60. The gasket body 60 is formed with a first slot 61 at the partition 111 of the mold corresponding to the mold, which is used to install the high-voltage insulation cylinder. The gasket body 60 is formed with a second slot 62 at the vertical recessed portion 16 of the mold corresponding to the mold, which is used to install the low-voltage insulation cylinder.

[0044] In some embodiments, a vacuum container is also included, and the 110kV dry-type transformer pad casting mold is located in the vacuum container. When the 110kV dry-type transformer pad casting mold is casting the pad, it is in a vacuum environment. The vacuum container includes an openable door or plate. When the door or plate is opened, the 110kV dry-type transformer pad casting mold can be placed in the vacuum container. The vacuum container is connected to a vacuum pumping device. After the door or plate is closed, the vacuum container is vacuumed by the vacuum pumping device, so that the 110kV dry-type transformer pad casting mold is in a vacuum environment. The vacuum container is also connected to a pouring pipe, one end of the pouring pipe extends out of the vacuum container, and the other end is connected to the injection port 11, and the casting material enters the injection port 11 through the pouring pipe, and then fills the mold cavity of the mold.

[0045] In addition, the inner wall of the mold cavity of this embodiment is designed with a taper or inclined surface to facilitate mold demoulding.

[0046] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A 110kV dry-type transformer spacer casting mold, characterized in that: It includes a top plate, a bottom plate, a front plate and two side plates; the front plate is connected to the two side plates to form a vertically through-mold cavity; the inner wall of the side plate is provided with a horizontal recessed portion; the bottom plate is closed at the bottom of the mold cavity, and is respectively connected to the front plate and the two side plates; the top plate is closed at the top of the mold cavity, and is connected to the two side plates; the top plate is provided with an injection port connected to the mold cavity; the bottom of the top plate is provided with a first bottom surface, a second bottom surface and a partition plate in sequence; the partition plate is located between the first bottom surface and the second bottom surface; the bottom of the top plate is provided with an overhanging extension portion between the first bottom surface and the front plate; the bottom of the overhanging extension portion is provided with a third bottom surface, and the third bottom surface is provided with a vertical recessed portion; the height of the third bottom surface is lower than the bottom height of the partition plate.

2. A 110kV dry-type transformer spacer casting mold according to claim 1, characterized in that: The bottom of the top plate is located between the first bottom surface and the second bottom surface, and a fourth bottom surface is also provided; the top of the partition is located at the fourth bottom surface; the setting height of the first bottom surface and / or the second bottom surface is located between the fourth bottom surface and the bottom of the partition.

3. A 110kV dry-type transformer spacer casting mold according to claim 2, characterized in that: There are a plurality of partitions, and the plurality of partitions are arranged at intervals.

4. A 110kV dry-type transformer spacer casting mold according to claim 3, characterized in that: The top plate is provided with air holes communicating with the mold cavity; the air holes are distributed between the partitions.

5. The 110kV dry-type transformer spacer casting mold according to claim 1, characterized in that: The top plate is provided with threaded lifting holes.

6. A 110kV dry-type transformer spacer casting mold according to claim 1, characterized in that: The top plate is provided with an observation port communicated with the mold cavity.

7. A 110kV dry-type transformer spacer casting mold according to claim 6, characterized in that: The injection port passes through the first bottom surface; the observation port passes through the second bottom surface.

8. The 110kV dry-type transformer spacer casting mold according to claim 1, characterized in that: The front plate and the two side plates surround and clamp the four sides of the top plate.

9. A 110kV dry-type transformer spacer casting mold according to claim 1, characterized in that: The mating end surfaces of the two side panels and the mating end surfaces of the side panel and the front panel are provided with a first sealing groove; the front panel and the two side panels enclose and clamp the four sides of the bottom panel; the four sides of the bottom panel are provided with a second sealing groove, and the second sealing groove is connected with the first sealing groove; sealing strips are provided in the first sealing groove and the second sealing groove.

10. A 110kV dry-type transformer spacer casting mold according to claim 1, characterized in that: It also includes a vacuum container; the 110kV dry-type transformer pad casting mold is located in the vacuum container.

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