CN210489434U

CN210489434U - Platen for pouring high-voltage winding of dry-type transformer

Info

Publication number: CN210489434U
Application number: CN201921041290.9U
Authority: CN
Inventors: 董圣文; 张煜乾; 鲁晓峰
Original assignee: Wuhan Jinpan Intelligent Technology Co ltd
Current assignee: Wuhan Jinpan Intelligent Technology Co ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-05-08
Anticipated expiration: 2029-07-05

Abstract

The utility model discloses a bedplate for pouring a high-voltage winding of a dry-type transformer, which is used for matching with a terminal board of a mould used for pouring the high-voltage winding and comprises a block body and a connecting column; the lower end surface of the block body is provided with a connecting hole and an annular groove; the connecting hole is positioned in the ring of the annular groove; two opposite side walls of the block body are vertical surfaces, and open slots are formed in the vertical surfaces; two ends of the connecting column are respectively connected with the connecting hole and the counter sink through threads. The utility model has the advantages that: the block body is connected with the terminal board through the connecting column when the high-voltage winding is poured, so that the resin amount required by pouring is greatly reduced, and after the block body is taken down, the creepage distance between the high-voltage taps is increased, and the electrical insulation performance is effectively improved; in addition, the annular groove can effectively prevent resin from entering a countersunk hole of the terminal plate during pouring; the sealing rubber strip is embedded in the annular groove, so that the sealing performance can be improved; the open slot can effectively avoid excessive flash.

Description

Platen for pouring high-voltage winding of dry-type transformer

Technical Field

The utility model relates to a dry-type transformer's high-voltage winding casting mold technical field specifically indicates a platen is used in the pouring of dry-type transformer high-voltage winding.

Background

At present, resin is used as a main insulating material for producing a dry-type transformer, particularly, the quantity of the resin required for producing a high-voltage winding is large, the resin is expensive, particularly, the price of high-quality imported resin is more than 2 times that of common domestic resin, and the product quality can be influenced if low-quality resin is adopted; therefore, how to optimize the amount of resin on the premise of ensuring the product quality is always a breakthrough point for cost reduction and efficiency improvement of dry-type transformer manufacturers, however, in the prior art, the amount of resin is usually reduced by changing the structure of the casting mold of the high-voltage winding, which leads to that the casting mold (such as the existing universal terminal board) is no longer a standard part, and the universality is poor. In addition, the creepage distance between the high-voltage taps of the existing high-voltage winding is limited, and the electrical insulation performance is still to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the problems of large resin consumption and insufficient electrical insulation performance in the prior method or device for pouring the high-voltage winding, and provides a bedplate for pouring the high-voltage winding of a dry-type transformer, which is used for matching with a mould terminal block used for pouring the high-voltage winding and comprises a block body and a connecting column;

the lower end surface of the block body is larger than the upper end surface, and the lower end surface of the block body is provided with a connecting hole and an annular groove; the connecting hole is positioned in the ring of the annular groove, and the position of the connecting hole corresponds to the position of a counter sink on the terminal board; two opposite side walls of the block body are inclined planes connecting the upper end face and the lower end face, the other two opposite side walls are vertical planes vertical to the upper end face and the lower end face, an open slot is formed in each vertical plane, and two ends of each open slot are communicated with the lower end face of the block body;

the two ends of the connecting column are respectively in threaded connection with the connecting hole and the counter sink, and one end of the connecting column penetrates through the counter sink and is matched with a nut.

Further, there are a plurality of the connection holes, and there is one of the annular grooves.

Furthermore, the connecting holes and the annular grooves are respectively provided with a plurality of connecting holes, and at least one annular groove is arranged on the periphery of each connecting hole or at least one connecting hole is arranged in the annular groove.

Furthermore, a collecting groove is also formed in the lower end face of the block body; the annular groove is communicated with the collecting groove through a flow passage.

Further, the block body is in a shape of a quadrangular frustum pyramid or a circular truncated cone.

Further, the annular groove is circular, rectangular or polygonal.

Further, the inclined plane of block and the contained angle of lower terminal surface are 45.

Furthermore, chamfers are arranged at the corners of the annular grooves or the open grooves.

The utility model has the advantages that: the block body is connected with the terminal board through the connecting column when the high-voltage winding is poured, so that the resin amount required by pouring is greatly reduced, and after the block body is taken down, the creepage distance between the high-voltage taps is increased, and the electrical insulation performance is effectively improved; in addition, the annular groove can effectively prevent resin from entering a countersunk hole of the terminal plate during pouring; the sealing rubber strip is embedded in the annular groove, so that the sealing performance can be improved; the open slot can effectively avoid excessive flash.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of a block of the platen for pouring a high-voltage winding of a dry-type transformer according to the present invention.

Fig. 2 is a schematic front view of the structure of fig. 1.

Fig. 3 is a left side view of the structure of fig. 2.

Fig. 4 is a schematic top view of fig. 2.

Fig. 5 is the schematic structural diagram of the connecting column of the bedplate for pouring the high-voltage winding of the dry-type transformer of the present invention.

Fig. 6 is a schematic view of the block of fig. 2 with a collection groove and an annular groove in an alternative arrangement.

Fig. 7 is a schematic structural view of fig. 1 in which only three connecting holes are formed and the size of the block is reduced.

Fig. 8 is a front view schematically showing the structure of a conventional terminal plate.

Fig. 9 is a schematic view showing a structure in which two blocks of different sizes of fig. 1 and 7 are mounted on the terminal plate shown in fig. 8.

Fig. 10 is a schematic top view of the structure of fig. 9.

Fig. 11 is a schematic view of the terminal plate and platen of fig. 10 separated from the molded high voltage winding after the high voltage winding is cast.

In the figure, 1. block; 2. connecting columns; 3. a lower end face; 4. connecting holes; 5. an annular groove; 6. an inclined surface; 7. an open slot; 8. a terminal plate; 9. a countersunk hole; 10. a plug; 11. a nut; 12. a high voltage tap; 13. a high voltage winding; 14. a recessed portion; 15. a collecting groove; 16. a flow channel; 17. and (6) chamfering.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

The platen for pouring the high-voltage winding of the dry-type transformer shown in fig. 1 to 11 is used for matching with a mold terminal plate 8 used for pouring the high-voltage winding 13, and the terminal plate 8 comprises countersunk holes 9 arranged in an array and plugs 10 for plugging the countersunk holes 9; the plug 10 plugs the counter bore 9 according to the position of the high-voltage tap 12 required by the high-voltage winding 13, and the plugging manner of the terminal plate 8 and the plug 10 or the manner of pouring the high-voltage winding 13 by using the terminal plate 8 is the prior art.

The bedplate of the embodiment comprises a block body 1 and a connecting column 2; the lower end surface 3 of the block body 1 is larger than the upper end surface, and the lower end surface 3 is provided with a connecting hole 4 and an annular groove 5; the connecting hole 4 is positioned in the ring of the annular groove 5, and the position of the connecting hole 4 corresponds to the position of the counter sink 9 on the terminal board 8 (because the terminal board 8 is a universal part, the arrangement position of the counter sink 9 on the terminal board is fixed, and therefore the relative position of each connecting hole 4 is limited); two opposite side walls of the block body 1 are inclined surfaces 6 connecting the upper end surface and the lower end surface 3, the other two opposite side walls are vertical surfaces vertical to the upper end surface and the lower end surface 3, an open slot 7 is arranged on the vertical surfaces, and two ends of the open slot 7 are communicated with the lower end surface 3 of the block body 1;

two ends of the connecting column 2 are respectively in threaded connection with the connecting hole 4 and the counter sink 9, and one end of the connecting column penetrates through the counter sink 9 and is matched with a nut 11.

As shown in the block 1 of fig. 1 or 2, there are 4 connecting holes 4, one

annular groove

5, and 4 connecting holes 4 are arranged in the annular groove 5; of course, there may be 3 connecting holes 4, for example, as shown in fig. 7, the position of the connecting hole 4 is set according to the position of the counter sink 9 on the terminal plate 8, and the position of the connecting hole 4 matches the position of the counter sink 9. According to different pouring requirements or the distance between the high-pressure taps 12, the block bodies 1 can be designed into different sizes, so that the block bodies have different models, and the model can be matched during specific pouring, for example, the block body 1 in fig. 1 is larger than the block body 1 in fig. 7; as shown in fig. 8 and 9, when a large area of the plug 10 is present, a large block 1 as shown in fig. 1 may be selected, and when a small area of the plug 10 is present, a small block 1 as shown in fig. 7 may be selected; it should be noted that, as shown in fig. 11, after casting, there is no high-voltage tap 12 in the area where the plug 10 is located, and this is a concrete casting method or casting process that is the prior art, and the main technical solution for solving the problem in this embodiment is to use the platen of this embodiment to perform casting in a manner of matching with the existing terminal board 8 to save resin and increase creepage distance.

The connecting holes 4 and the annular grooves 5 can be respectively provided with a plurality of, and the periphery of each connecting hole 4 is provided with at least one annular groove 5; as shown in fig. 6, an annular groove 5 is provided outside each of the connecting holes 4, and these annular grooves 5 communicate with a collecting groove 15 provided in the lower end surface 3 of the block body 1 through a flow passage 16, of course, the flow passage 16 is also provided in the lower end surface 3 of the block body 1.

The connecting holes 4 and the annular grooves 5 of the block body 1 can also be arranged in a manner that at least one connecting hole 4 is arranged in each annular groove 5 as shown in fig. 1, and 4 connecting holes 4 are arranged in each annular groove 5 as shown in fig. 1.

The block body 1 may be in a quadrangular frustum shape or a circular truncated cone shape, and is preferably in a quadrangular frustum shape in the present embodiment. The annular groove 5 is circular, rectangular or polygonal, of course, the annular groove 5 may be in any other shape, and it is only necessary to avoid the connecting holes 4 and make the connecting holes 4 of the lower end surface 3 of the block body 1 all be in the annular groove 5. When pouring, the annular groove 5 can be filled with the sealing strip to improve the sealing effect, and if the annular groove 5 is not filled with the sealing strip, a small amount of resin can flow into the annular groove 5 and cannot enter the connecting hole 4 even if the resin enters between the block body 1 and the terminal board 8 in the pouring process.

The inclined surface 6 of the block body 1 forms an included angle of 45 degrees with the lower end surface 3. The angle design is more favorable for demolding. The annular groove 5 or the corner of the open groove 7 is provided with a chamfer 17.

When the bedplate of the embodiment is used for pouring process, firstly, the connecting holes 4 of the connecting columns 2 and the blocks 1 are connected through threads (inner threads are arranged in the connecting holes 4, and outer threads are arranged at two ends of the connecting columns 2), then the blocks 1 are attached to the terminal board 8, and each connecting column 2 penetrates through the corresponding counter sink 9, so that the connecting columns 2 penetrate through the terminal board 8 and are screwed on the connecting columns 2 through the nuts 11, and the fixing of the blocks 1 and the terminal board 8 is realized. The use is very convenient, when demolding is carried out after pouring, the whole block body 1 and the terminal board 8 are taken down together, as shown in fig. 11, the concave part 14 is the area where the block body 1 is located during pouring, the creepage distance of the high-voltage tap 12 of the high-voltage winding 13 is increased due to the existence of the concave part 14, the resin using amount is reduced, and the total volume of the concave parts 14 of the same high-voltage winding 13 is the saved resin amount.

Claims

1. A platen for pouring a high-voltage winding of a dry-type transformer, which is used for matching with a mold terminal plate (8) used when the high-voltage winding is poured, is characterized in that: comprises a block body (1) and a connecting column (2);

the lower end face (3) of the block body (1) is larger than the upper end face, and the lower end face (3) is provided with a connecting hole (4) and an annular groove (5); the connecting hole (4) is positioned in the ring of the annular groove (5), and the position of the connecting hole (4) corresponds to the position of a counter sink (9) on the terminal board (8); two opposite side walls of the block body (1) are inclined surfaces (6) connecting the upper end surface and the lower end surface (3), the other two opposite side walls are vertical surfaces perpendicular to the upper end surface and the lower end surface (3), an open slot (7) is formed in each vertical surface, and two ends of each open slot (7) are communicated with the lower end surface (3) of the block body (1);

the two ends of the connecting column (2) are respectively in threaded connection with the connecting hole (4) and the counter sink (9), and one end of the connecting column penetrates through the counter sink (9) and is matched with a nut (11).

2. The platen for casting a high-voltage winding of a dry-type transformer according to claim 1, wherein: the connecting holes (4) are multiple, and the annular groove (5) is one.

3. The platen for casting a high-voltage winding of a dry-type transformer according to claim 1, wherein: the connecting holes (4) and the annular grooves (5) are respectively provided with a plurality of connecting holes, and at least one annular groove (5) is arranged on the periphery of each connecting hole (4) or at least one connecting hole (4) is arranged in the annular groove of each annular groove (5).

4. A dry-type transformer high-voltage winding casting bedplate according to claim 1, 2 or 3, characterized in that: the lower end surface (3) of the block body (1) is also provided with a gathering groove (15); the annular groove (5) is communicated with the collecting groove (15) through a flow passage (16).

5. The platen for casting a high-voltage winding of a dry-type transformer according to claim 1, wherein: the block body (1) is in a quadrangular frustum pyramid shape or a circular truncated cone shape.

6. The platen for casting a high-voltage winding of a dry-type transformer according to claim 1, wherein: the annular groove (5) is circular, rectangular or polygonal.

7. The platen for casting a high-voltage winding of a dry-type transformer according to claim 1, wherein: the inclined plane (6) of the block body (1) and the lower end face (3) form an included angle of 45 degrees.

8. The platen for casting a high-voltage winding of a dry-type transformer according to claim 1, wherein: and chamfers (17) are arranged at the corners of the annular groove (5) or the open groove (7).