External current transformer
By using threaded connections and sealing ring components in external current transformers, the problems of time-consuming assembly and poor sealing are solved, and efficient assembly and good sealing are achieved.
Patent Information
- Application Number
- CN202422363595.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The assembly process of existing external current transformers is time-consuming and has poor sealing effect, mainly due to the inefficiency caused by the bolt fixing method and the easy deformation of the sealing ring.
The first sleeve is designed in the protective cover, and the first flange part is extruded and fixed, and the connection between the first flange part and the protective cover is achieved through threaded connection, and a sealing ring assembly includes a connecting ring, a shrapnel and a silicone sleeve, so as to achieve sealing using the elasticity of the shrapnel.
The assembly process is simplified, assembly efficiency is improved, and a good sealing effect is ensured.
Smart Images
Figure CN223123726U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current transformers, and particularly relates to an external current transformer. Background Technique
[0002] A common structure of an external current transformer includes a main housing, a transition flange installed at one end of the main housing, and a CT protective cover covering the outer periphery of the main housing. The CT protective cover and the main housing enclose a receiving space for accommodating a ring-shaped current transformer winding. The main housing, the transition flange, and the CT protective cover of this external current transformer are all fixed by bolts. The current transformer winding is cast on the main housing. The main housing can be both the outer housing for sealing SF6 gas and the support electrode of the current transformer. The number of parts required for the whole product is greatly reduced, the overall assembly process is reduced, the product structure is compact, the size is small, and the cost is low. However, there are still the following defects: First, the main housing, the transition flange, and the CT protective cover are all fixed by bolts. Insulating sleeves are also required for the bolts, and insulating plates need to be provided between the main housing and the transition flange. Therefore, the entire assembly process is still time-consuming and the efficiency is low. Second, in order to ensure the sealing performance, sealing rings need to be added between the main housing, the transition flange, and the CT protective cover. However, the existing sealing rings are prone to deformation during installation and use, resulting in poor sealing effect. Content of the Utility Model
[0003] The purpose of the utility model is to provide an external current transformer to solve the problems raised in the above background technique.
[0004] In order to solve the above technical problems, the utility model provides the following technical solution: An external current transformer includes a protective cover. A receiving cavity is opened in the protective cover. A first sleeve is sleeved in the receiving cavity. A current transformer winding is fixedly connected to the first sleeve. A second sleeve is arranged at the top end of the first sleeve. A first flange portion is arranged at the top end of the second sleeve. A third sleeve is fixedly connected to the lower surface of the first flange portion, and the third sleeve is threadedly connected to the protective cover. An installation groove is opened on the upper surface of the protective cover. A sealing ring assembly is arranged in the installation groove, and the sealing ring assembly is arranged at the bottom end of the first flange portion.
[0005] Preferably, an internal thread is opened in the receiving cavity, an external thread is opened on the third sleeve, and the external thread is threadedly connected to the internal thread.
[0006] Preferably, a connecting portion is fixedly connected to the upper surface of the first flange portion, and a second flange portion is fixedly connected to the upper surface of the connecting portion.
[0007] Preferably, a junction box is fixedly connected to the protective cover.
[0008] Preferably, a bottom plate is fixedly connected to the lower surface of the first sleeve, and the bottom plate is sleeved in the receiving cavity.
[0009] Preferably, the sealing ring assembly includes a connecting ring, a first elastic piece, a second elastic piece, a silica gel sleeve and a groove. A plurality of first elastic pieces are evenly distributed on the outer walls of both sides of the connecting ring. One end of the first elastic piece is fixedly connected with the second elastic piece, and the connecting ring, the first elastic piece and the second elastic piece are all arranged in the silica gel sleeve.
[0010] Preferably, a groove is formed on the upper surface of the silica gel sleeve.
[0011] An external current transformer provided by the utility model has the following advantages: in the utility model, the first sleeve is designed in the protective cover and fixed by extrusion of the first flange portion, and insulated by the second sleeve. The first flange portion and the protective cover are connected by threads. This design abandons the existing bolt fixing method, simplifies the assembly process, and has higher assembly efficiency. The sealing ring assembly of the utility model is shaped by the connecting ring, and the elastic force of the elastic piece is used to make the silica gel sleeve fit the sealing surface, so as to ensure a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0013] Figure 1 It is a schematic diagram of the overall front sectional structure of the present utility model;
[0014] Figure 2 is Figure 1 an enlarged view of the structure of area A in
[0015] Figure 3 It is a schematic diagram of the three-dimensional sectional structure of the sealing ring assembly of the present utility model;
[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the protective cover of the present utility model.
[0017] In the figure: 1. Protective cover; 11. Accommodating cavity; 12. Installation groove; 13. Internal thread; 14. Junction box; 2. Base plate; 21. First sleeve; 22. Current transformer winding; 23. Second sleeve; 3. Sealing ring assembly; 31. Connecting ring; 32. First elastic piece; 33. Second elastic piece; 34. Silica gel sleeve; 35. Groove; 4. Third sleeve; 41. External thread; 42. First flange portion; 43. Connecting portion; 44. Second flange portion. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of 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 creative efforts shall fall within the protection scope of the present utility model.
[0019] Please refer to the attached Figure 1 - attached Figure 4, an embodiment provided by the present utility model: an external current transformer, including a protective cover 1, an accommodation cavity 11 is provided in the protective cover 1, a first sleeve 21 is sleeved in the accommodation cavity 11, a current transformer winding 22 is fixedly connected to the first sleeve 21, a second sleeve 23 is provided at the top of the first sleeve 21, a first flange portion 42 is provided at the top of the second sleeve 23, the lower surface of the first flange portion 42 is fixedly connected to a third sleeve 4, and the third sleeve 4 is threadedly connected to the protective cover 1. An installation groove 12 is provided on the upper surface of the protective cover 1, a sealing ring assembly 3 is provided in the installation groove 12, and the sealing ring assembly 3 is provided at the bottom end of the first flange portion 42. The accommodation cavity 11 is used to accommodate the first sleeve 21, the first sleeve 21 is used to install the current transformer winding 22, the second sleeve 23 is used to isolate the first flange portion 42 and the first sleeve 21, and the third sleeve 4 is used to connect the first flange portion 42 and the protective cover 1; an internal thread 13 is provided in the accommodation cavity 11, an external thread 41 is provided on the third sleeve 4, and the external thread 41 is threadedly connected to the internal thread 13. The external thread 41 cooperates with the internal thread 13 to threadedly connect the third sleeve 4 to the protective cover 1; a connecting portion 43 is fixedly connected to the upper surface of the first flange portion 42, a second flange portion 44 is fixedly connected to the upper surface of the connecting portion 43, and the third sleeve 4, the first flange portion 42, the connecting portion 43 and the second flange portion 44 are of an integral structure; a junction box 14 is fixedly connected to the protective cover 1, and the junction box 14 is used to access the circuit; a bottom plate 2 is fixedly connected to the lower surface of the first sleeve 21, and the bottom plate 2 is sleeved in the accommodation cavity 11, and the bottom plate 2 and the first sleeve 21 are of an integral structure; the sealing ring assembly 3 includes a connecting ring 31, a first elastic piece 32, a second elastic piece 33, a silica gel sleeve 34 and a groove 35. A plurality of first elastic pieces 32 are evenly distributed on the outer walls on both sides of the connecting ring 31. One end of the first elastic piece 32 is fixedly connected to the second elastic piece 33, and the connecting ring 31, the first elastic piece 32 and the second elastic piece 33 are all provided in the silica gel sleeve 34. The connecting ring 31, the first elastic piece 32 and the second elastic piece 33 are of an integral structure. When the connecting ring 31 is pressed down, it will cause the first elastic piece 32 to expand, and the first elastic piece 32 will cause the second elastic piece 33 to fit the inner wall of the installation groove 12, and the silica gel sleeve 34 is used to achieve sealing; a groove 35 is provided on the upper surface of the silica gel sleeve 34, and the groove 35 is used to provide space for the deformation of the silica gel sleeve 34, so that the top of the silica gel sleeve 34 can fit the first flange portion 42.
[0020] Working principle: When assembling and using the utility model, the first sleeve 21 with the current transformer winding 22 installed is placed in the accommodating cavity 11, and then the second sleeve 23 is placed on the top of the first sleeve 21, the sealing ring assembly 3 is placed in the mounting groove 12, and finally the third sleeve 4 is threadedly connected to the protective cover 1 through the external thread 41 and the internal thread 13, and the first flange portion 42 squeezes the connecting ring 31, so that the first elastic sheet 32 is unfolded, and the second elastic sheet 33 is pressed against the inner wall of the mounting groove 12, and the silicone sleeve 34 is used to achieve sealing; wherein, the bottom plate 2 and the first sleeve 21 are an integral structure, the second sleeve 23 is made of insulating material and is used to resist the first sleeve 21, the third sleeve 4, the first flange portion 42, the connecting portion 43 and the second flange portion 44 are an integral structure, the connecting ring 31, the first elastic sheet 32 and the second elastic sheet 33 are an integral structure, the groove 35 is used to provide space for the deformation of the silicone sleeve 34, so that the top of the silicone sleeve 34 can fit the first flange portion 42, and the junction box 14 is used to access the line.
[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.
[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. An external current transformer, comprising a protective cover (1), characterized in that: An accommodation cavity (11) is formed in the protective cover (1). A first sleeve (21) is sleeved in the accommodation cavity (11). A current transformer winding (22) is fixedly connected to the first sleeve (21). A second sleeve (23) is arranged at the top end of the first sleeve (21). A first flange portion (42) is arranged at the top end of the second sleeve (23). A third sleeve (4) is fixedly connected to the lower surface of the first flange portion (42). The third sleeve (4) is threadedly connected to the protective cover (1). An installation groove (12) is formed in the upper surface of the protective cover (1). A sealing ring assembly (3) is arranged in the installation groove (12). The sealing ring assembly (3) is arranged at the bottom end of the first flange portion (42).
2. The external current transformer according to claim 1, wherein: An internal thread (13) is formed in the accommodation cavity (11). An external thread (41) is formed on the third sleeve (4). The external thread (41) is threadedly connected to the internal thread (13).
3. An external current transformer according to claim 1, characterized in that: A connecting portion (43) is fixedly connected to the upper surface of the first flange portion (42). A second flange portion (44) is fixedly connected to the upper surface of the connecting portion (43).
4. An external current transformer according to claim 1, characterized in that: A junction box (14) is fixedly connected to the protective cover (1).
5. An external current transformer according to claim 1, characterized in that: A bottom plate (2) is fixedly connected to the lower surface of the first sleeve (21). The bottom plate (2) is sleeved in the accommodation cavity (11).
6. An external current transformer according to claim 1, characterized in that: The sealing ring assembly (3) includes a connecting ring (31), a first elastic sheet (32), a second elastic sheet (33), a silica gel sleeve (34) and a groove (35). A plurality of first elastic sheets (32) are evenly distributed on the outer walls on both sides of the connecting ring (31). One end of the first elastic sheet (32) is fixedly connected to the second elastic sheet (33). The connecting ring (31), the first elastic sheet (32) and the second elastic sheet (33) are all arranged in the silica gel sleeve (34).
7. An external current transformer according to claim 6, characterized in that: A groove (35) is formed in the upper surface of the silica gel sleeve (34).