Sealing structure of pouring current transformer

Abstract

The utility model discloses a sealing structure of pouring current transformer, including casing, pouring channel, insulating material and pouring head, the inside of casing is provided with the iron core, the iron core is provided with the winding, the inside of casing is evenly filled with insulating material, and the top of casing is provided with the cover plate, and the cover plate is provided with the pouring channel. The two ends of the top of the cover plate are each provided with a pouring channel, the bottom ends of the pouring channels communicate with the shell through pouring heads, the bottom ends of the interiors of the pouring channels are each provided with a blocking ball through a first reset spring, two sets of sealing pieces are arranged at the positions, above the blocking balls, in the pouring channels, and the top ends of the blocking balls abut against the sealing pieces. By installing the shell, the cover plate, the pouring channel, the pouring head, the blocking ball, the first reset spring and the sealing piece, insulating materials in the shell are prevented from overflowing, manual operation or tool auxiliary operation is not needed, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a sealing structure for a cast current transformer. Background Technique

[0002] A current transformer is an electrical instrument based on the principle of electromagnetic induction, which is used to convert the large current in the power system into a small current for easy measurement, protection and control. The casting of a current transformer means that the various components of the current transformer are first assembled in a shell according to the design requirements, and then an insulating material such as epoxy resin is used to cast and form the transformer, so as to achieve the insulation of the transformer. The various components are also tightly combined through the curing of the material, which has the advantages of compact structure and pollution resistance.

[0003] When a current transformer is being cast, the insulating material is generally introduced into the shell through a casting port. Therefore, it is necessary to seal the casting port after casting to prevent the insulating material from overflowing from the inside of the current transformer. For example, a kind of anti-interference indoor cast current transformer disclosed in the patent number CN214847994U moves the injection pipe downward by rotating the rotary knob, so that the glue outlet hole on the conical head abuts against the gasket on the inner wall of the injection hole, so as to ensure that the epoxy resin will not overflow from the inside of the current transformer after casting. However, this structure requires manual rotation of the knob or the use of external tools, which is inconvenient in use. Content of the Utility Model

[0004] The purpose of the utility model is to provide a sealing structure for a cast current transformer to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A sealing structure for a cast current transformer, including a shell, a casting channel, an insulating material and a casting head. A iron core is arranged inside the shell, and a winding is arranged on the iron core. The inside of the shell is evenly filled with an insulating material, and a cover plate is arranged at the top of the shell. Pouring channels are arranged at both ends of the top of the cover plate, and the bottom ends of the pouring channels are connected to the shell through casting heads. Plug balls are arranged at the bottom ends inside the pouring channels through first return springs, and two groups of sealing members are arranged in the pouring channels above the plug balls, and the top end of the plug ball abuts against the sealing member.

[0006] Preferably, guide grooves are arranged on both sides inside the pouring channel, and guide blocks matching the guide grooves are arranged on both sides of the plug ball.

[0007] Preferably, grooves are opened at the top ends on both sides inside the pouring channel, and pressing blocks are arranged inside the grooves through second return springs, and one ends of the pressing blocks are connected to the sealing members.

[0008] Preferably, sealing covers are provided at the tops of the pouring channels, and rubber plugs are provided at one ends of the sealing covers close to the pouring channels.

[0009] Preferably, elastic ropes are provided on one sides of the pouring channels, and the elastic ropes are connected to the sealing covers.

[0010] Preferably, the pouring head has a conical structure, and through holes are evenly formed in the pouring head.

[0011] Preferably, the sealing member is made of silica gel material, and the sides of the sealing member are attached to the outer side walls of the upper ends of the plug balls.

[0012] Preferably, limiting grooves are formed on both sides inside the groove, and limiting blocks matching the limiting grooves are provided on both sides of the pressing block.

[0013] Compared with the prior art, the beneficial effect of the present utility model is that: the sealing structure of the pouring current transformer is installed with a housing, a cover plate, a pouring channel, a pouring head, a plug ball, a first return spring and a sealing member. The insulating material is introduced into the housing through the pouring channel. The insulating material exerts pressure on the plug ball, causing it to compress the first return spring, so that the plug ball is separated from the sealing member. Thus, the insulating material enters and passes through the pouring head into the interior of the housing. When pouring stops, the acting force from the insulating material disappears, and the plug ball resets under the action of the first return spring. The upper end of the plug ball contacts the sealing member, blocking and sealing the inlet port, thereby preventing the insulating material inside the housing from overflowing. There is no need for manual or tool-assisted operation, which is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a front view sectional structure schematic diagram of the present utility model;

[0016] Figure 2 It is a sectional structure schematic diagram of the pouring channel of the present utility model;

[0017] Figure 3 It is of the present utility model Figure 2 Enlarged structure schematic diagram at A in;

[0018] Figure 4 It is of the present utility model Figure 2 Enlarged structure schematic diagram at B in;

[0019] Figure 5 This is a schematic top view structure diagram of the cover plate of the present utility model.

[0020] In the figure: 1. Housing; 2. Winding; 3. Pouring channel; 4. Cover plate; 5. Iron core; 6. Insulating material; 7. Plug ball; 8. Elastic rope; 9. Sealing cover; 10. Rubber plug; 11. Guide block; 12. Guide groove; 13. First return spring; 14. Pouring head; 15. Sealing member; 16. Groove; 17. Second return spring; 18. Limit groove; 19. Pressing block; 20. Through hole. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-5 , an embodiment provided by the present utility model: A sealing structure for a pouring current transformer, including a housing 1, a pouring channel 3, an insulating material 6 and a pouring head 14. An iron core 5 is arranged inside the housing 1, and a winding 2 is arranged on the iron core 5. The inside of the housing 1 is uniformly filled with the insulating material 6, and a cover plate 4 is arranged on the top of the housing 1. First, the iron core 5 and the winding 2 are fixed inside the housing 1, and then the cover plate 4 is covered;

[0023] Pouring channels 3 are arranged at both ends of the top of the cover plate 4, and the bottom ends of the pouring channels 3 are connected to the housing 1 through the pouring heads 14. Plug balls 7 are arranged at the bottom ends inside the pouring channels 3 through the first return springs 13;

[0024] The insulating material 6 is injected through the pouring channel 3. The insulating material 6 exerts pressure on the plug ball 7, causing it to compress the first return spring 13, so that the plug ball 7 is separated from the sealing member 15, and thus the insulating material 6 enters and enters the inside of the housing 1 through the pouring head 14;

[0025] The pouring head 14 has a conical structure, reducing the dead angle generated during the flow of the insulating material 6, and through holes 20 are uniformly formed on the pouring head 14, so that the insulating material 6 can flow into the housing 1 evenly;

[0026] Two groups of sealing members 15 are arranged in the pouring channel 3 above the plug ball 7. The top end of the plug ball 7 abuts against the sealing member 15. The sealing member 15 is made of silica gel material, and the sides of the sealing member 15 are all attached to the outer side wall of the upper end of the plug ball 7;

[0027] When the pouring stops, the acting force from the insulating material 6 disappears, and the blocking ball 7 resets under the action of the first reset spring 13. The upper end of the blocking ball 7 contacts the seal 15, blocking and sealing the inlet port, thereby preventing the insulating material 6 from overflowing from the pouring channel 3. There is no need to rotate tools or perform other auxiliary operations, which is convenient and fast.

[0028] Guide grooves 12 are provided on both sides inside the pouring channel 3, and guide blocks 11 matching the guide grooves 12 are provided on both sides of the blocking ball 7 to guide and limit the movement of the blocking ball 7.

[0029] Grooves 16 are provided at the tops of both sides inside the pouring channel 3, and pressing blocks 19 are provided in the grooves 16 through second reset springs 17. One ends of the pressing blocks 19 are connected to the seal 15.

[0030] Limit grooves 18 are provided on both sides inside the grooves 16, and limit blocks matching the limit grooves 18 are provided on both sides of the pressing block 19.

[0031] The seal 15 is always in close contact with the upper end of the blocking ball 7 under the action of the second reset spring 17, improving the sealing performance.

[0032] Sealing covers 9 are provided at the tops of the pouring channels 3, and rubber plugs 10 are provided at the ends of the sealing covers 9 close to the pouring channels 3, which can connect the sealing covers 9 to the pouring channels 3, further improving the sealing performance.

[0033] Elastic ropes 8 are provided on one side of each pouring channel 3, and the elastic ropes 8 are connected to the sealing covers 9 to prevent the sealing covers 9 from being lost.

[0034] Working principle: When the embodiment of the present application is in use, first, the iron core 5 and the winding 2 are fixed in the housing 1, and then the cover plate 4 is covered. The insulating material 6 is injected through the pouring channel 3. The insulating material 6 exerts pressure on the blocking ball 7, causing it to compress the first reset spring 13, so that the blocking ball 7 separates from the seal 15. Thus, the insulating material 6 enters and passes through the pouring head 14 into the housing 1. The pouring head 14 is of a conical structure, reducing the dead angles generated during the flow of the insulating material 6. Through holes 20 are uniformly provided on the pouring head 14, enabling the insulating material 6 to flow evenly into the housing 1. When the pouring stops, the acting force from the insulating material 6 disappears, and the blocking ball 7 resets under the action of the first reset spring 13. The upper end of the blocking ball 7 contacts the seal 15, blocking and sealing the inlet port, thereby preventing the insulating material 6 from overflowing from the pouring channel 3. There is no need to rotate tools or perform other auxiliary operations, which is convenient and fast. In addition, the seal 15 is always in close contact with the upper end of the blocking ball 7 under the action of the second reset spring 17, improving the sealing performance.

[0035] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0038] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sealing structure for a cast current transformer, characterized in that: The invention comprises a shell (1), a pouring channel (3), an insulating material (6) and a pouring head (14); an iron core (5) is arranged inside the shell (1), and a winding (2) is arranged on the iron core (5); the inside of the shell (1) is evenly filled with insulating material (6); a cover plate (4) is arranged on the top of the shell (1); pouring channels (3) are arranged at both ends of the top of the cover plate (4); the bottom ends of the pouring channels (3) are connected to the shell (1) through the pouring head (14); a blocking ball (7) is arranged at the bottom end of the pouring channel (3) through a first return spring (13); and two groups of sealing members (15) are arranged in the pouring channel (3) above the blocking ball (7); the top end of the blocking ball (7) is in contact with the sealing member (15).

2. The sealing structure of a cast current transformer according to claim 1, characterized in that: Guide grooves (12) are provided on both sides of the pouring channel (3), and guide blocks (11) matching the guide grooves (12) are provided on both sides of the blocking ball (7).

3. The sealing structure of a cast current transformer according to claim 1, characterized in that: The top ends of both sides of the pouring channel (3) are provided with grooves (16), and the inside of the grooves (16) are provided with pressure blocks (19) via second return springs (17), and one end of the pressure blocks (19) is connected to the sealing member (15).

4. The sealing structure of a cast current transformer according to claim 1, characterized in that: A sealing cover (9) is provided at the top of each of the pouring channels (3), and a rubber plug (10) is provided at one end of each of the sealing covers (9) close to the pouring channels (3).

5. The sealing structure of a cast current transformer according to claim 4, characterized in that: An elastic rope (8) is provided on one side of the pouring channel (3), and the elastic rope (8) is connected to a sealing cover (9).

6. The sealing structure of a cast current transformer according to claim 1, characterized in that: The pouring head (14) has a conical structure, and through holes (20) are evenly arranged on the pouring head (14).

7. The sealing structure of a cast current transformer according to claim 1, characterized in that: The sealing member (15) is made of a silicone material, and the side surfaces of the sealing member (15) are in contact with the outer side wall of the upper end of the blocking ball (7).

8. The sealing structure of a cast current transformer according to claim 3, characterized in that: Limiting grooves (18) are provided on both sides of the interior of the groove (16), and limiting blocks matching the limiting grooves (18) are provided on both sides of the pressing block (19).

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