Current transformer, combined electric appliance and combined electric appliance extension method

Abstract

The invention belongs to the technical field of electrics, and discloses a current transformer, a combined electric appliance and a combined electric appliance extension method. The current transformer comprises an outer cover assembly, and a conducting rod, a first contact seat and a connecting piece which are arranged in the outer cover assembly; the connecting piece is connected in the first contact seat, and the end part is provided with a first matching part; the first end of the conducting rod is inserted into the first contact seat and is provided with a first jack. A second matching part is formed at the end part of the first insertion hole, and the first matching part can penetrate through the second matching part and is inserted into the first insertion hole; the conducting rod can be movably hung on the connecting piece along the axial direction of the conducting rod through the matching of the connecting piece and the first jack, so that the lower end of the conducting rod is closer to the bottom end of the outer cover assembly, an operator can conveniently observe the insertion connection between the lower end of the conducting rod and the second contact seat, the collision and friction problems caused by invisibility are avoided, the generation of metal powder is reduced, and the production efficiency is improved. And the extension docking efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to a current transformer, a combined electrical appliance and a combined electrical appliance expansion method. Background Art

[0002] High voltage switchgear (GIS) is usually designed with a reserved unit interface for long-term planning so that expansion can be carried out at the reserved interface. For example, the constructed part is a disconnector, and a reserved interface is designed at the lower end of the disconnector. During expansion, the current transformer is connected below the reserved interface, and the circuit breaker is connected below the current transformer. Specifically, the upper contact seat is connected at the reserved interface, the lower contact seat is connected at the circuit breaker interface, and the upper end of the conductive rod of the current transformer is inserted into the upper contact seat and the lower end is inserted into the lower contact seat.

[0003] Some existing expansion plans require that the current transformer and the circuit breaker below be assembled, and then the conductive rod of the transformer be plugged into the upper contact seat at the reserved interface. This docking method requires the isolation switch to be raised so that there is enough expansion space below the reserved interface to complete the docking. If the housing and conductive rod of the current transformer are installed first, and then the lower contact seat at the circuit breaker interface is plugged into the conductive rod, it is difficult to complete the plugging with the lower contact seat because the conductive rod is hidden inside the housing, and the expansion operation is extremely inconvenient.

[0004] Therefore, there is an urgent need for a current transformer, a combined electrical appliance and a combined electrical appliance expansion method to solve the above-mentioned problems existing in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a current transformer, a combined electrical appliance and a combined electrical appliance expansion method, which can conveniently and quickly complete the docking of the upper and lower parts of the current transformer during expansion without reserving a large expansion interval, and can clean the inside of the current transformer before the docking is completed, thereby improving the cleanliness of the inside of the product.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a current transformer is provided, comprising an outer cover assembly, and a conductive rod, a first contact seat and a connecting piece arranged in the outer cover assembly;

[0008] The connecting member is connected to the first contact seat and has a first matching portion at its end;

[0009] The first end of the conductive rod is inserted into the first contact seat and is provided with a first socket, the end of the first socket forms a second matching portion, and the first matching portion can pass through the second matching portion and be inserted into the first socket; the conductive rod can be movably suspended on the connecting member along its own axial direction through the matching of the connecting member and the first socket.

[0010] As a preferred solution of the current transformer provided by the present invention, the connecting member includes a plurality of spring sheets arranged at intervals, the plurality of spring sheets can be elastically deformed in a direction close to each other, and the first matching portion includes a hook protrusion protruding from the outer wall of the spring sheet;

[0011] The second matching portion is protrudingly disposed on the inner wall of the first insertion hole and can be elastically hooked and engaged with the first matching portion.

[0012] As a preferred solution of the current transformer provided by the present invention, the first jack includes a first matching hole and a second matching hole surrounded by the second matching portion, and the first matching portion can pass through the second matching hole and enter the first matching hole;

[0013] The inner diameter of the second matching hole first decreases and then increases in a direction away from the first matching hole, and the minimum inner diameter of the second matching hole is smaller than the inner diameter of the first matching hole and smaller than the maximum dimension of the first matching portion along the radial direction of the first insertion hole.

[0014] As a preferred solution of the current transformer provided by the present invention, the first matching portion includes an external thread structure, and the second matching hole is provided with an internal thread structure at a position with the smallest inner diameter;

[0015] The external thread structure can be screwed together with the internal thread structure and then disengaged and enter the first matching hole.

[0016] As a preferred solution of the current transformer provided by the present invention, the hook-and-engagement protrusion has a first guide surface, a first transition surface and a first hook-and-engagement surface connected in sequence;

[0017] The first guide surface gradually approaches the center of the connecting member in a direction away from the first transition surface; both the first guide surface and the first transition surface can slide along the second matching portion;

[0018] The first hook surface gradually approaches the center of the connector along a direction away from the first transition surface; the first hook surface is hooked on the second matching portion;

[0019] and / or,

[0020] The plurality of spring pieces are distributed in a circular pattern.

[0021] As a preferred solution of the current transformer provided by the present invention, the connecting member further comprises a screw portion, a screwing portion and a connecting portion connected in sequence, and the elastic sheet is connected to an end of the connecting portion away from the screwing portion;

[0022] The screw portion is threadedly screwed in the first contact seat, the screwing portion abuts against the bottom wall of the first contact seat, the screwing portion is non-circular, and the orthographic projection of the screw portion along the axial direction of the screw portion completely covers the connecting portion and the plurality of spring sheets.

[0023] As a preferred solution of the current transformer provided by the present invention, there is a gap between the portion of the connector inserted into the first jack and the inner wall of the first jack;

[0024] And / or, the current transformer further includes a second contact seat, and the second end of the conductive rod is plug-fitted with the second contact seat.

[0025] As a preferred solution of the current transformer provided by the present invention, the second contact seat is provided with a second contact cavity; the current transformer further comprises a guide rod, one end of which extends into the second contact cavity and is connected to the second contact seat, and the other end of which extends out of the second contact cavity;

[0026] The second end of the conductive rod is provided with a second plug hole. The second end of the conductive rod is inserted into the second contact cavity and plug-fitted with the guide rod through the second plug hole.

[0027] In a second aspect, a combination electrical appliance is provided, including an isolating switch, a circuit breaker and the current transformer as described above, wherein the isolating switch is provided with a first docking portion, the first contact seat is connected to the first docking portion, the circuit breaker is provided with a second docking portion, and the second end of the conductive rod is connected to the second docking portion.

[0028] In a third aspect, a combined electrical appliance expansion method is provided, which is applied to the combined electrical appliance as described above, and the method comprises:

[0029] Connecting the first contact seat to the first docking portion, and connecting the connecting member into the first contact seat;

[0030] Insert the conductive rod into the connecting piece, and allow the first matching portion to pass through the second matching portion to be inserted into the first insertion hole, so that the conductive rod can be movably suspended on the connecting piece along its own axial direction;

[0031] The outer cover assembly is sleeved outside the conductive rod and connected to the first docking portion;

[0032] The circuit breaker is lifted so that the second docking portion is connected to the conductive rod from bottom to top, and the conductive rod is driven to move upward and be inserted into the first contact seat.

[0033] Beneficial effects of the present invention:

[0034] The present invention provides a current transformer, a combined electrical appliance and a combined electrical appliance expansion method. When the current transformer is used for expansion and docking, a connector can be first connected to a first contact seat, and the first contact seat is connected to a reserved docking position of a part to be expanded. Then, the first end of a conductive rod is plugged into the connector through a first plug hole. During the plugging, a first matching portion on the connector can pass through a second matching portion and be inserted into the first plug hole. At this time, the conductive rod can be movably suspended at the end of the connector through the matching of the connector and the first plug hole, and the conductive rod has not yet been plugged into place with the first contact seat. Then, the outer cover assembly is placed outside the conductive rod and connected to the reserved docking position. After the outer cover assembly is installed, the extension part is lifted to connect the extension part with the second end (i.e., the lower end) of the conductive rod. During the connection, since the conductive rod is suspended at the end of the connector, the lower end of the conductive rod is closer to the bottom of the outer cover assembly, which is convenient for the operator to visually observe the connection between the lower end of the conductive rod and the extension part, making the connection part easier to align and the operation smoother, avoiding the bump and friction problems caused by the lack of observation, and reducing the generation of metal powder. Continue to lift the extension part so that the first end of the conductive rod slides along the connector until the extension part abuts against the outer cover assembly. At this time, the conductive rod is plugged into place with the first contact seat, and finally the outer cover assembly and the extension part are connected.

[0035] Moreover, before connecting the extension part and the lower end of the conductive rod, the inside of the connected outer cover assembly can be cleaned to improve the cleanliness of the inside of the product and avoid the presence of foreign matter inside the product affecting normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0037] Figure 1 It is a first process diagram of expansion and docking of a combined electrical appliance provided in a specific embodiment of the present invention;

[0038] Figure 2 It is a second process diagram of expansion and docking of a combined electrical appliance provided in a specific embodiment of the present invention;

[0039] Figure 3is a schematic structural diagram of a current transformer provided in some embodiments of the present invention;

[0040] Figure 4 is an exploded schematic diagram of a current transformer provided in some embodiments of the present invention;

[0041] Figure 5 is a schematic diagram of a conductive part of a current transformer provided in some embodiments of the present invention;

[0042] Figure 6 It is a schematic diagram of the suspension of the conductive rod and the connecting piece of the current transformer provided in some embodiments of the present invention;

[0043] Figure 7 is a first view of a connector provided by some embodiments of the present invention;

[0044] Figure 8 is a second view of a connector provided by some embodiments of the present invention;

[0045] Fig. 9 is a schematic structural diagram of a conductive rod provided in some embodiments of the present invention;

[0046] Fig.10 yes Fig. 9 A partial view of

[0047] Fig.11 is a schematic diagram of the cooperation between the first jack and the connector provided in some embodiments of the present invention;

[0048] Fig.12 is a schematic structural diagram of an outer cover assembly of a current transformer provided in some embodiments of the present invention;

[0049] Fig.13 is an exploded schematic diagram of a current transformer provided in some other embodiments of the present invention;

[0050] Fig.14 yes Fig.13 A partial view of the .

[0051] In the figure:

[0052] 1. Outer cover assembly; 2. Conductive rod; 3. First contact seat; 4. Second contact seat; 5. Connector; 6. Guide rod;

[0053] 11. Shell; 12. Shielding structure; 13. Coil; 14. Wiring terminal; 15. Terminal box;

[0054] 111. first flange; 112. second flange;

[0055] 21. first plug hole; 22. second mating portion; 23. second plug hole;

[0056] 211, first matching hole; 212, second matching hole;

[0057] 2121, first hole section; 2122, second hole section; 2123, third hole section;

[0058] 2121a, second guide surface; 2122a, second transition surface; 2123a, second hook surface;

[0059] 231, speaker port;

[0060] 31. a first contact cavity;

[0061] 41. a second contact cavity;

[0062] 50, first matching portion; 51, spring piece; 52, connecting portion; 53, screwing portion; 54, screw portion;

[0063] 510. Hook and catch the convex part;

[0064] 5101, first guide surface; 5102, first transition surface; 5103, first hook surface;

[0065] 61. Arc surface;

[0066] 200, isolating switch; 300, circuit breaker; 100, current transformer;

[0067] 201, first docking portion;

[0068] 301. Second docking portion. DETAILED DESCRIPTION

[0069] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0070] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0073] In this embodiment, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0074] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0075] Embodiment 1

[0076] like Figure 1 and Figure 2 As shown, it is a schematic diagram of the process of expansion docking of the combined electrical apparatus provided in this embodiment. The combined electrical apparatus includes an isolating switch 200, a circuit breaker 300 and a current transformer 100. The isolating switch 200 is installed at a certain height from the ground, and a first docking portion 201 is reserved on the isolating switch 200. The first docking portion 201 is used to connect the current transformer 100 and the circuit breaker 300 during expansion. Specifically, the circuit breaker 300 is provided with a second docking portion 301. The upper end of the current transformer 100 is connected to the first docking portion 201 reserved on the isolating switch 200, and the lower end of the current transformer 100 is connected to the second docking portion 301 of the circuit breaker 300.

[0077] Specifically, the first docking portion 201 is a first insulating terminal, and the second docking portion 301 is a second insulating terminal.

[0078] like Figure 3 and Figure 4 , which is a schematic diagram of the structure of the current transformer 100 provided in this embodiment. The current transformer 100 specifically includes an outer cover component 1 and a conductive part arranged in the outer cover component 1. Figure 5 As shown, it includes a conductive rod 2, a first contact seat 3, a second contact seat 4 and a connecting member 5.

[0079] The connecting member 5 is connected to the first contact seat 3 and is provided with a first matching portion 50 at its end; the first end of the conductive rod 2 is inserted into the first contact seat 3 and is provided with a first plug hole 21, the end of the first plug hole 21 forms a second matching portion 22, and the first matching portion 50 can pass through the second matching portion 22 and be inserted into the first plug hole 21; the conductive rod 2 can be movably suspended on the connecting member 5 along its own axial direction through the matching of the connecting member 5 and the first plug hole 21; the second end of the conductive rod 2 is plugged and matched with the second contact seat 4. Specifically, the first end of the conductive rod 2 is the upper end of the conductive rod 2, and the second end of the conductive rod 2 is the lower end of the conductive rod 2.

[0080] During expansion, the first contact seat 3 is connected to the first docking portion 201 (first insulating terminal) reserved on the disconnector 200, specifically to the conductor portion on the first insulating terminal. The second contact seat 4 is connected to the second docking portion 301 (ie, the second insulating terminal) on the circuit breaker 300.

[0081] Specifically, the first contact seat 3 is provided with a first contact cavity 31, and a screw is used to penetrate the bottom wall of the first contact cavity 31 and is screwed to the conductor part on the first docking portion 201. The connector 5 is installed in the first contact cavity 31, and the first end of the conductive rod 2 is inserted in the first contact cavity 31 and plugged with the connector 5 through the first jack 21, so that the first end of the conductive rod 2 is in conductive contact with the first contact seat 3. Furthermore, a first contact finger groove is provided on the inner wall of the first contact seat 3, and a first spring contact finger is installed in the first contact finger groove, and the first end of the conductive rod 2 is inserted in the first spring contact finger to achieve reliable conductive contact with the first contact seat 3.

[0082] The second contact seat 4 is provided with a second contact cavity 41, and a screw is used to penetrate the bottom wall of the second contact cavity 41 and is screwed to the conductor part on the second docking portion 301. The second end of the conductive rod 2 is inserted into the second contact cavity 41 and is in conductive contact with the second contact seat 4. Furthermore, a second contact finger groove is provided on the inner wall of the second contact seat 4, and a second spring contact finger is installed in the second contact finger groove. The second end of the conductive rod 2 is inserted into the second spring contact finger to achieve reliable conductive contact with the second contact seat 4.

[0083] It should be noted that the second end of the conductive rod 2 may also be connected to the second docking portion 301 without the aid of the second contact seat 4. For example, the second end of the conductive rod 2 may be directly connected to the conductor part on the second docking portion 301 through plug-in or other connection methods to achieve conductive connection; or it may also be connected to the second docking portion 301 with the aid of other components, and is not limited to the connection methods listed above through the second contact seat 4. The connection method of the second end of the conductive rod 2 is not limited here.

[0084] When the current transformer 100 provided by the present application is used for expansion and docking, the connector 5 can be first connected to the first contact seat 3, and the first contact seat 3 can be connected to the reserved docking position of the part to be expanded (i.e., the first docking portion 201 reserved for the isolating switch 200), and then the first end of the conductive rod 2 is plugged into the connector 5 through the first socket 21. When plugging, the first matching portion 50 on the connector 5 can pass through the second matching portion 22 and be inserted into the first socket 21. At this time, the conductive rod 2 can be movably suspended at the end of the connector 5 through the matching of the connector 5 and the first socket 21, and the conductive rod 2 has not yet been plugged into place with the first contact seat 3. Figure 4 and Figure 6 As shown, the lower end of the conductive rod 2 suspended on the connecting member 5 is close to the bottom of the outer cover assembly 1, which is convenient for the operator to observe the conductive rod 2 from the lower end opening of the outer cover assembly 1.

[0085] Subsequently, the outer cover assembly 1 is sleeved on the outside of the conductive rod 2 and connected to the first docking portion 201. After the outer cover assembly 1 is installed, the extended portion (i.e., the circuit breaker 300) connected with the second contact seat 4 is lifted to plug the second contact seat 4 with the second end (i.e., the lower end) of the conductive rod 2. During the plugging, since the conductive rod 2 is suspended at the end of the connector 5, the lower end of the conductive rod 2 is closer to the bottom end of the outer cover assembly 1, which is convenient for the operator to visually observe the plugging of the lower end of the conductive rod 2 with the second contact seat 4, making the insertion easier to align and smoother, avoiding the bumps and friction problems caused by the lack of observation, and reducing the generation of metal powder.

[0086] After the second contact seat 4 and the conductive rod 2 are plugged into place, continue to lift the extension part so that the first end of the conductive rod 2 slides along the connecting piece 5 until the extension part (circuit breaker 300) abuts against the outer cover assembly 1. At this time, the conductive rod 2 and the first contact seat 3 are plugged into place, and finally the outer cover assembly 1 and the extension part are connected.

[0087] Furthermore, before plugging the second contact seat 4 and the conductive rod 2, the inside of the connected outer cover assembly 1 can be cleaned to improve the cleanliness of the inside of the product and avoid the presence of foreign matter inside the product that may affect normal operation.

[0088] In this embodiment, the first matching portion 50 and the second matching portion 22 are engaged with each other to realize that the conductive rod 2 is movably suspended on the connecting member 5 along its own axial direction.

[0089] like Figure 7 and Figure 8 As shown, the connecting member 5 includes a plurality of spring sheets 51 arranged at intervals, and the plurality of spring sheets 51 can be elastically deformed in a direction close to each other, and combined with Fig. 9 The first matching part 50 includes a hooking protrusion 510 protruding from the outer wall of the plurality of spring sheets 51; the second matching part 22 protrudes from the inner wall of the first insertion hole 21 and can be elastically hooked and matched with the first matching part 50. When the plurality of spring sheets 51 are inserted into the first insertion hole 21, they slide along the second matching part 22 protruding from the inner wall of the first insertion hole 21. Under the extrusion, the plurality of spring sheets 51 shrink and deform in the direction of approaching each other, and return to their original state after passing through the second matching part 22, so that the hooking protrusion 510 on the plurality of spring sheets 51 hooks on the second matching part 22, thereby realizing the suspension of the conductive rod 2.

[0090] Furthermore, the multiple spring pieces 51 in this embodiment are evenly distributed around the circumference, which improves the firmness when the conductive rod 2 is suspended and helps to balance the force on the connecting member 5. Figure 7 and Figure 8 The lower end of the connecting member 5 is shaped like a mushroom head.

[0091] like Fig.10 As shown, the first insertion hole 21 includes a first matching hole 211 and a second matching hole 212 surrounded by the second matching portion 22, and the first matching portion 50 can pass through the second matching hole 212 to enter the first matching hole 211; the inner diameter of the second matching hole 212 first decreases and then increases in the direction away from the first matching hole 211. The minimum inner diameter L4 of the second matching hole 212 is smaller than the inner diameter L2 of the first matching hole 211, so as to form a necking structure at the minimum inner diameter of the second matching hole 212, so that the first matching portion 50 can be hooked at the intersection of the second matching hole 212 and the first matching hole 211. The minimum inner diameter L4 of the second matching hole 212 is smaller than the maximum dimension of the first matching portion 50 along the radial direction of the first insertion hole 21, so that the multiple hooking protrusions 510 of the first matching portion 50 can be elastically gathered toward the middle at the position of the minimum inner diameter of the second matching hole 212.

[0092] More specifically, the second matching hole 212 includes a first hole segment 2121, a second hole segment 2122 and a third hole segment 2123, and the first hole segment 2121 is connected to the first matching hole 211 through the second hole segment 2122 and the third hole segment 2123 in sequence. The hooking protrusions 510 on the multiple spring pieces 51 pass through the first hole segment 2121, the second hole segment 2122 and the third hole segment 2123 in sequence, and the first matching portion 50 in the third hole segment 2123 can be hooked on the inner wall of the third hole segment 2123.

[0093] The inner diameter of the first hole section 2121 gradually increases in the direction away from the second hole section 2122, so that the end of the first plug hole 21 forms a trumpet-shaped opening, which is convenient for guiding the lower end of the connector 5 into the first plug hole 21 and reduces the difficulty of insertion. The inner diameter of the third hole section 2123 gradually increases in the direction away from the second hole section 2122, so that the first plug hole 21 forms a necking structure at the position of the second matching portion 22, and the spring piece 51 can complete the hooking with the inner wall of the third hole section 2123 after returning to its original state.

[0094] like Fig.11 As shown, the maximum dimension L1 of the first matching portion 50 along the radial direction of the first insertion hole 21 is greater than the inner diameter L4 of the second hole segment 2122 (i.e., the minimum inner diameter of the second matching hole 212), so that when the first matching portion 50 passes through the second hole segment 2122, the multiple spring pieces 51 can be squeezed and deformed toward the middle, and after passing through the second matching portion 22, the multiple spring pieces 51 return to their original state.

[0095] See also Figure 8 The hook convex portion 510 has a first guide surface 5101, a first transition surface 5102 and a first hook surface 5103 connected in sequence; the first guide surface 5101 gradually approaches the center of the connector 5 in a direction away from the first transition surface 5102; the first guide surface 5101 and the first transition surface 5102 can both slide along the second matching portion 22; the first hook surface 5103 gradually approaches the center of the connector 5 in a direction away from the first transition surface 5102. Fig.10 The inner wall surface of the first hole section 2121 is the second guide surface 2121a, the inner wall surface of the second hole section 2122 is the second transition surface 2122a, and the inner wall surface of the third hole section 2123 is the second hook surface 2123a.

[0096] When the upper end of the conductive rod 2 is plugged into the connector 5, the first guide surface 5101 first enters the first hole section 2121 and slides with the second guide surface 2121a. When entering the second hole section 2122, the first transition surface 5102 and the second transition surface 2122a slide and fit together. At this time, the multiple spring pieces 51 shrink toward the middle to pass through the necking structure, and finally the first hook surface 5103 hooks onto the second hook surface 2123a of the second matching portion 22. The cooperation between the first guide surface 5101 and the second guide surface 2121a plays a good guiding role during docking, further reducing the difficulty of plugging in. The arrangement of the first hook surface 5103 and the second hook surface 2123a can not only realize the hanging of the conductive rod 2, but also facilitate disassembly during later maintenance. At the same time, when the conductive rod 2 is in a position such as Figure 4In the suspended state shown, the conductive rod 2 can not only move upward relative to the connecting member 5, but also swing in all directions forward, backward, left and right relative to the connecting member 5 and the first contact seat 3. When the operator inserts the second contact seat 4 and the lower end of the conductive rod 2, the conductive rod 2 can move adaptively and be more conveniently inserted into the second contact seat 4.

[0097] like Figure 4 , Figure 7 as well as Figure 8 As shown, the connector 5 further includes a screw portion 54, a screwing portion 53 and a connector 52 connected in sequence, and a plurality of spring pieces 51 are all connected to one end of the connector 52 away from the screwing portion 53, and are evenly distributed in a circle with the center of the connector 52 as the center. The outer diameter of the connector 52 is consistent with the outer diameter of the outer contour formed by the plurality of spring pieces 51, so that the entire connector 5 has a high strength. The screw portion 54 is screwed into the first contact seat 3, and the screwing portion 53 abuts against the bottom wall of the first contact seat 3. The screwing portion 53 is non-circular, and the orthographic projection of the screw portion 53 along the axial direction of the screw portion 54 completely covers the connector 52 and the plurality of spring pieces 51. When connecting the screw portion 54 and the first contact seat 3, a wrench with an inner hole can be set outside the connector 5, and the screwing portion 53 can be clamped for screwing, so that the connector 5 can be screwed into the first contact seat 3 conveniently and quickly. Exemplarily, the cross-sectional area of ​​the screwing portion 53 is a regular hexagon, which is compatible with a hexagonal wrench.

[0098] In this embodiment, after the conductive rod 2 is completely inserted into the first contact seat 3, there is a gap between the portion of the connector 5 inserted into the first socket 21 and the inner wall of the first socket 21, that is, the conductive rod 2 does not contact the connector 5 after being plugged into place, thereby avoiding the conductive rod 2 used for passing current from being shunted at the connector 5, and at the same time avoiding a high temperature rise on the connector 5 due to the passing current, reducing the heat generated on the conductive rod 2, and ensuring that the current transformer 100 operates reliably and safely for a long time.

[0099] Specifically, Fig.11 As shown, when the conductive rod 2 is plugged in place, the connecting portion 52 is located in the second hole section 2122, and the first matching portion 50 completely enters the first matching hole 211 of the first plug hole 21. The maximum dimension L1 of the first matching portion 50 along the radial direction of the first plug hole 21 is smaller than the inner diameter of the first matching hole 211, so that there is a gap between the first matching portion 50 and the inner wall of the first matching hole 211. The outer diameter dimension L3 of the connecting portion 52 is smaller than the minimum inner diameter dimension L4 of the second hole section 2122, so that there is a gap between the connecting portion 52 and the inner wall of the second hole section 2122, thereby achieving a gap between the portion of the connector 5 inserted into the first plug hole 21 and the inner wall of the first plug hole 21, thereby preventing the conductive rod 2 from contacting the connecting portion 5 when current passes through.

[0100] like Fig.12As shown, the housing assembly 1 includes a housing 11, a shielding structure 12, a coil 13, a terminal 14 and a terminal box 15. The shielding structure 12 is arranged inside the housing 11, and there is a gap between the shielding structure 12 and the housing 11. The coil 13 is installed in the gap. The terminal 14 and the terminal box 15 are installed on the housing 11 for wiring. Furthermore, a first flange 111 is provided at the upper end of the housing 11, and a second flange 112 is provided at the lower end. The first flange 111 is used to connect to the first docking portion 201 reserved on the disconnector 200, and the second flange 112 is used to connect to the second docking portion 301 on the circuit breaker 300.

[0101] This embodiment further provides a combined electrical appliance expansion method, which is applied to the combined electrical appliance as described above. The combined electrical appliance expansion method includes:

[0102] S1. Connect the first contact seat 3 to the first docking portion 201, and connect the connector 5 inside the first contact seat 3. Specifically, the connector 5 can be connected inside the first contact seat 3 via the screw portion 54, and then the first contact seat 3 and the first docking portion 201 are connected via bolts.

[0103] S2, plug the conductive rod 2 into the connector 5, and make the first matching portion 50 pass through the second matching portion 22 to be inserted into the first plug hole 21, so that the conductive rod 2 can be movably suspended on the connector 5 along its own axial direction. At this time, the conductive rod 2 is not plugged into place with the first contact seat 3, and the conductive rod 2 can continue to move up along the connector 5, such as Figure 1 shown.

[0104] S3, the outer cover assembly 1 is placed outside the conductive rod 2 and connected to the first docking portion 201, and the outer cover assembly 1 is specifically connected to the first docking portion 201 through the first flange 111. Figure 2 and Figure 4 As shown, at this time, since the conductive rod 2 is suspended at the end of the connecting piece 5 and is not plugged into place with the first contact seat 3, the lower end of the conductive rod 2 is closer to the flange opening of the second flange 112 at the lower end of the outer cover assembly 1. When docking the second contact seat 4 and the lower end of the conductive rod 2, it is convenient for the operator to visually observe the position of the lower end of the conductive rod 2, thereby reducing the difficulty of docking.

[0105] S4, lifting the circuit breaker 300 so that the second docking portion 301 is connected to the conductive rod 2 from bottom to top, and driving the conductive rod 2 to move upward and be inserted into the first contact seat 3.

[0106] Taking the example of the second end of the conductive rod 2 being connected to the second docking portion 301 through the second contact seat 4, the second contact seat 4 is connected to the second docking portion 301, and the circuit breaker 300 is lifted so that the second contact seat 4 is plugged into the conductive rod 2 from bottom to top. When the second contact seat 4 and the lower end of the conductive rod 2 are plugged into place, the second contact seat 4 continues to move upward and drives the conductive rod 2 to move upward until the second docking portion 301 abuts against the second flange 112. At this time, the upper end of the conductive rod 2 is inserted into the first contact seat 3.

[0107] S5. Connect the second docking portion 301 and the second flange 112.

[0108] Before lifting the circuit breaker 300, the interior of the outer cover assembly 1 can be cleaned first to remove metal powder, various dust and debris that fall into the outer cover assembly 1 during the docking operation, so as to improve the cleanliness of the interior of the product and avoid the presence of impurities and foreign matter inside the product that may affect normal operation.

[0109] Usually, the combined electrical appliance is of three phases A, B, and C. The three current transformers 100 are connected to the three reserved first connecting parts 201. Before connecting the circuit breaker 300, the distance between the second flanges 112 of the three current transformers 100 can be measured to facilitate the adjustment of the distance between the second connecting parts 301 on the circuit breaker 300 to adapt to the distance between the second flanges 112 of the current transformer 100, so as to facilitate the next step of connecting.

[0110] Embodiment 2

[0111] Based on the same inventive concept as that of the first embodiment, this embodiment provides a current transformer 100. In this embodiment, as in the first embodiment, the hook-and-catch fit of the first fitting portion 50 and the second fitting portion 22 is used to enable the conductive rod 2 to be movably suspended on the connecting member 5 along its own axial direction.

[0112] The difference between this embodiment and the first embodiment is that the first matching portion 50 includes an external thread structure, and the second matching hole 212 is provided with an internal thread structure at the position of the minimum inner diameter; the external thread structure can be screwed with the internal thread structure and then disengaged and enter the first matching hole 211, so that the conductive rod 2 can be restricted from falling downward by hooking the thread structure. Fig.10 The inner wall of the second hole section 2122 is provided with several circles of internal thread structure. When installing the conductive rod 2, align the first plug hole of the conductive rod 2 with the connector 5 and insert it, rotate the conductive rod 2, so that the conductive rod 2 is screwed with the external thread structure on the connector 5 through the internal thread structure at the minimum inner diameter. During the matching process, the conductive rod 2 moves upward relative to the connector 5, and after moving upward until the internal thread structure and the external thread structure are separated, a buckle structure is formed. At this time, since the internal thread teeth are buckled above the external thread teeth, the conductive rod 2 is blocked from moving downward, and the conductive rod 2 can also be suspended on the connector 5.

[0113] Specifically, the multiple spring pieces 51 in the first embodiment can be replaced by threaded columns with external thread structures, and the inner wall of the second hole section 2122 can be processed to form a small number of internal thread structures that can be threadedly matched with the external thread structures.

[0114] Embodiment 3

[0115] This embodiment provides a current transformer 100 , which is improved on any one of the first and second embodiments.

[0116] like Fig.13 and Fig.14 As shown, in this embodiment, the current transformer 100 further includes a guide rod 6, which is connected to the second contact seat 4. Specifically, one end of the guide rod 6 extends into the second contact cavity 41 of the second contact seat 4 and is connected to the second contact seat 4, and the other end of the guide rod 6 extends out of the second contact cavity 41. The second end of the conductive rod 2 is provided with a second plug hole 23, and the second end of the conductive rod 2 is inserted into the second contact cavity 41, and is plugged and matched with the guide rod 6 through the second plug hole 23. When the second contact seat 4 and the conductive rod 2 are plugged in, the guide rod 6 can be inserted into the second plug hole 23 of the conductive rod 2 in advance, which plays a guiding role in the lifting process of the lower circuit breaker 300, avoiding collision and friction between the conductive rod 2 and the second contact seat 4, preventing the generation of metal powder, and improving the quality of the product after docking.

[0117] Furthermore, a horn port 231 is provided at the lower end of the second insertion hole 23 , and the inner diameter of the horn port 231 gradually increases from top to bottom, so that the guide rod 6 can be inserted into the second insertion hole 23 more smoothly.

[0118] The end of the guide rod 6 is provided with an arc surface 61 , which can form a tip to further reduce the difficulty of inserting into the second insertion hole 23 , and can reduce the possibility of generating powder chips due to friction and collision.

[0119] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A current transformer, characterized in that: It comprises an outer cover component (1), a conductive rod (2), a first contact seat (3) and a connecting piece (5) arranged in the outer cover component (1); The connecting member (5) is connected to the first contact seat (3) and a first matching portion (50) is provided at the end thereof; The first end of the conductive rod (2) is inserted into the first contact seat (3) and is provided with a first insertion hole (21); the end of the first insertion hole (21) forms a second matching portion (22); the first matching portion (50) can pass through the second matching portion (22) and be inserted into the first insertion hole (21); the conductive rod (2) can be movably suspended on the connecting member (5) along its own axial direction through the matching of the connecting member (5) and the first insertion hole (21).

2. The current transformer according to claim 1, characterized in that: The connecting member (5) comprises a plurality of spring sheets (51) arranged at intervals, the plurality of spring sheets (51) being capable of elastic deformation in a direction approaching each other, and the first matching portion (50) comprises a hooking protrusion (510) protruding from the outer wall of the spring sheet (51); The second matching portion (22) is protruding from the inner wall of the first insertion hole (21) and can be elastically hooked and engaged with the first matching portion (50).

3. The current transformer according to claim 2, characterized in that: The first insertion hole (21) comprises a first matching hole (211) and a second matching hole (212) surrounded by the second matching portion (22), and the first matching portion (50) can pass through the second matching hole (212) and enter the first matching hole (211); The inner diameter of the second matching hole (212) first decreases and then increases in a direction away from the first matching hole (211), and the minimum inner diameter of the second matching hole (212) is smaller than the inner diameter of the first matching hole (211) and smaller than the maximum dimension of the first matching portion (50) in the radial direction of the first insertion hole (21).

4. The current transformer according to claim 3, characterized in that: The first matching portion (50) comprises an external thread structure, and the second matching hole (212) is provided with an internal thread structure at a position where the inner diameter is the smallest; The external thread structure can be screwed together with the internal thread structure and then disengaged and enter the first matching hole (211).

5. The current transformer according to claim 2, characterized in that: The hook-engaging protrusion (510) comprises a first guide surface (5101), a first transition surface (5102) and a first hook-engaging surface (5103) which are connected in sequence; The first guide surface (5101) gradually approaches the center of the connecting member (5) in a direction away from the first transition surface (5102); the first guide surface (5101) and the first transition surface (5102) can both slide along the second matching portion (22); The first hook surface (5103) gradually approaches the center of the connecting member (5) in a direction away from the first transition surface (5102); the first hook surface (5103) is hooked on the second matching portion (22); and / or, The plurality of spring pieces (51) are distributed in a circular pattern.

6. The current transformer according to claim 2, characterized in that: The connecting member (5) further comprises a screw portion (54), a screwing portion (53) and a connecting portion (52) which are connected in sequence, and the elastic sheet (51) is connected to an end of the connecting portion (52) away from the screwing portion (53); The screw portion (54) is threadedly screwed into the first contact seat (3), the screwing portion (53) abuts against the bottom wall of the first contact seat (3), the screwing portion (53) is non-circular, and the orthographic projection of the screwing portion (53) along the axial direction of the screw portion (54) completely covers the connecting portion (52) and the plurality of spring sheets (51).

7. The current transformer according to any one of claims 1 to 6, characterized in that: There is a gap between the portion of the connecting member (5) inserted into the first plug hole (21) and the inner wall of the first plug hole (21); And / or, the current transformer further comprises a second contact seat (4), and the second end of the conductive rod (2) is plug-fitted to the second contact seat (4).

8. The current transformer according to claim 7, characterized in that: The second contact seat (4) is provided with a second contact cavity (41); the current transformer further comprises a guide rod (6), one end of the guide rod (6) extends into the second contact cavity (41) and is connected to the second contact seat (4), and the other end of the guide rod (6) extends out of the second contact cavity (41); The second end of the conductive rod (2) is provided with a second insertion hole (23), and the second end of the conductive rod (2) is inserted into the second contact cavity (41) and plug-fitted with the guide rod (6) through the second insertion hole (23).

9. A combination electrical appliance, characterized in that: The invention comprises an isolating switch (200), a circuit breaker (300) and a current transformer as claimed in any one of claims 1 to 8, wherein the isolating switch (200) is provided with a first docking portion (201), the first contact seat (3) is connected to the first docking portion (201), the circuit breaker (300) is provided with a second docking portion (301), and the second end of the conductive rod (2) is connected to the second docking portion (301).

10. A method for expanding a combined electrical appliance, characterized in that: Applied to the combination electrical appliance according to claim 9, the method comprises: Connecting the first contact seat (3) to the first docking portion (201), and connecting the connecting member (5) inside the first contact seat (3); The conductive rod (2) is plugged into the connecting piece (5), and the first matching portion (50) is passed through the second matching portion (22) to be inserted into the first insertion hole (21), so that the conductive rod (2) is movably suspended on the connecting piece (5) along its own axial direction; The outer cover component (1) is sleeved outside the conductive rod (2) and connected to the first docking portion (201); The circuit breaker (300) is lifted so that the second docking portion (301) is connected to the conductive rod (2) from bottom to top, and the conductive rod (2) is driven to move upward and be inserted into the first contact seat (3).

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