Draw-out type bus sleeve

Abstract

The utility model discloses a draw-out type bus sleeve, which is arranged in a bus chamber of a switch cabinet and comprises an electric conductor and an insulating rubber sleeve, the insulating rubber sleeve wraps the periphery of the conductor; the electric conductor is provided with a first contact and a second contact; the first contact and the second contact are arranged in a staggered mode in the axial direction and face different directions. A supporting part is arranged on one side, back on to the first contact, of the bus sleeve; the supporting part extends in the direction parallel to or overlapped with the axis of the first contact; when the bus bushing is installed in a bus chamber, the second contact is connected with other circuit components in the switch cabinet in a drawable manner. The supporting part is supported on the partition plate of the bus chamber and fixes the first contact in the axial direction. According to the supporting part, a traditional cantilever type bus sleeve is converted into a statically determinate structure, so that the structural reliability of the bus sleeve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a switch cabinet technical field especially relates to a kind of withdrawable bus duct. BACKGROUND

[0002] In the busbar chamber of switch cabinet, multi-phase busbar is arranged to connect the electrical equipment in the cabinet and realize the collection, distribution and transmission of electric energy. When short-circuit fault occurs, the busbar needs to withstand the heat and electric force caused by short-circuit current, which is an important primary component in the switch cabinet. In the solid insulation cabinet, the busbar is wrapped with an insulating sleeve made of epoxy resin and other materials, which constitutes a bus duct as a whole.

[0003] In the existing switch cabinet, some bus ducts often adopt "Z" shape, "L" shape and other spatial structures. One end of the bus duct is connected and fixed with circuit breakers and other circuit components, and the other end is cantilevered in the busbar chamber to connect external incoming lines. During long-term use, the cantilevered end is repeatedly stressed by the electric force caused by circuit faults and the external force generated during plugging and unplugging, which causes the internal structure of the bus duct to loosen due to bending moment, affecting its safety and durability. Therefore, it is necessary to improve the structural stability of the existing bus duct to improve safety and durability. SUMMARY

[0004] The main technical problem to be solved by the utility model is to provide a bus duct with stable support structure to improve safety and durability.

[0005] To solve the above technical problems, the utility model provides a withdrawable bus duct arranged in the busbar chamber of a switch cabinet. The bus duct includes a conductive body and an insulating sleeve. The insulating sleeve wraps around the outer periphery of the conductive body.

[0006] The conductive body has a first contact and a second contact. The first contact and the second contact are axially offset and oriented in different directions.

[0007] The bus duct is provided with a support portion on the side facing away from the first contact. The support portion extends along the axis direction parallel to or coinciding with the first contact.

[0008] When the bus duct is installed in the busbar chamber, the second contact is connected to other circuit components in the switch cabinet in a withdrawable manner, and the support portion is supported on the partition plate of the busbar chamber to fix the first contact in the axial direction.

[0009] In a preferred embodiment, the support portion and the insulating sleeve are constructed as a whole, i.e. the support portion and the insulating sleeve are made of the same material and obtained by integral casting.

[0010] In a preferred embodiment, the support portion extends in the same axis as the first contact.

[0011] In a preferred embodiment, the support portion is provided with a plurality of first threaded holes at the end thereof for detachable connection with the partition plate by electric bolts.

[0012] In a preferred embodiment, the first contact and the second contact are arranged in axial parallel and face opposite directions.

[0013] In a preferred embodiment, the electric conductor further comprises a connecting portion, one end of which is connected perpendicularly to the first contact and the other end of which is connected perpendicularly to the second contact.

[0014] In a preferred embodiment, the insulating rubber sleeve is thickened at the outer periphery of the junction between the connecting portion and the first contact and the second contact, and the thickened insulating rubber sleeve is symmetrically distributed about the junction.

[0015] In a preferred embodiment, the second contact is configured with a concave conical cavity, and a second silica gel sealing sleeve is solidified on the inner wall of the conical cavity.

[0016] In a preferred embodiment, the first contact is configured as a conical body, and a first silica gel sealing sleeve is solidified on the outer periphery of the conical body.

[0017] In a preferred embodiment, the surface of the insulating rubber sleeve is solidified with a semiconductive shielding layer.

[0018] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:

[0019] The draw-out busbar sleeve extends the support portion on the side facing away from the first contact. When the busbar sleeve is installed in the busbar chamber, the support portion is supported on the partition plate of the busbar chamber, and the external force caused by plugging and unplugging the first contact is transmitted and offset. This change from a cantilever structure to a statically determinate structure improves the structural reliability of the busbar sleeve.

[0020] Secondly, the connecting portion and the first contact and the second contact are connected by a right-angle structure, making the busbar sleeve structure more compact. To achieve this structure, the insulating rubber sleeve is thickened at the junction, which not only improves the insulation performance but also makes the busbar sleeve more stable.

[0021] Furthermore, the busbar sleeve is wrapped with an equal-thickness epoxy resin insulating rubber sleeve, achieving full insulation and sealing. A semiconductive shielding layer is also provided on the surface of the insulating rubber sleeve, achieving reliable electric field shielding effect, thereby improving the use safety of the busbar sleeve.

[0022] In addition, the second contact, the first contact and the adjacent circuit component are connected in a withdrawable manner, facilitating individual maintenance or replacement, and greatly reducing the operation and maintenance cost of the switch cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective view of the bus sleeve in the embodiment one of the utility model;

[0024] Figure 2 It is a sectional view of the bus sleeve in the embodiment one of the utility model;

[0025] Figure 3 It is a side view of the bus sleeve in the embodiment one of the utility model;

[0026] Figure 4 It is a sectional view of the traditional bus sleeve in the embodiment one of the utility model;

[0027] Figure 5 It is a sectional view of the bus sleeve and the partition plate in the embodiment one of the utility model;

[0028] Figure 6 It is a sectional view of the bus sleeve in the embodiment two of the utility model.

[0029] Marked in the figure: 1-first contact, 11-first silica gel sealing sleeve, 2-second contact, 21-second silica gel sealing sleeve, 22-second threaded hole, 3-connection part, 4-insulating rubber sleeve, 5-supporting part, 51-first threaded hole, 6-partition plate. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model; obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments; based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] In the description of the utility model, it needs to be explained that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "set with", "suits / interface", "connection" and so on, should do the broad sense understanding, for example "connection", can be wall-mounted connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication, for the ordinary skilled in the art, can be understood according to the specific circumstances the specific meaning of the above-mentioned term in the utility model.

[0033] Embodiment one

[0034] As Figures 1-5 The utility model embodiment provides a kind of A-phase extractable bus duct, for being arranged in the bus chamber of switch cabinet, to carry out electrical connection to the circuit component such as incoming line and internal circuit breaker outside switch cabinet.The bus duct includes electrically conductive body, and insulating rubber sleeve 4 wrapped in the outer periphery of the electrically conductive body.Overall, the electrically conductive body has first contact 1 and second contact 2, and the first contact 1 and the second contact 2 are arranged in axial staggered position.The bus duct is provided with support part 5 on the side away from the first contact 1.When the bus duct is installed in bus chamber, the second contact 2 is extractably connected with the circuit breaker contact in switch cabinet, and the first contact 1 is connected with external incoming line.At this time, the support part 5 is supported on the partition 6 of bus chamber, and the first contact 1 can be fixed along the axial direction.

[0035] The specific structure and connection relationship of each component of the bus duct are described below in conjunction with related drawings.

[0036] As Figure 2 As shown in the figure, in the embodiment, the electrically conductive body includes first contact 1, second contact 2 and connecting part 3 connecting the first contact 1 and the second contact 2.The first contact 1 is a male contact, which is configured as a conical body protruding outward to connect the external incoming line.The second contact 2 is a female contact, which is provided with a concave conical cavity to connect with the circuit breaker contact.The first contact 1 and the second contact 2 are arranged in parallel along the axial direction, and are opposite to each other.The connecting part 3 is connected perpendicularly with the first contact 1 and the second contact 2, and forms a "Z" shaped structure electrically conductive body with the two.The first contact 1, the second contact 2 and the connecting part 3 are surrounded by an insulating rubber sleeve 4 to realize the full insulation of the bus duct.In this embodiment, the material of the insulating rubber sleeve 4 is epoxy resin.

[0037] In this embodiment, the second contact 2 is extractably connected with the circuit breaker contact.In order to ensure the sealing and insulation of the two after connection meet the use demand, the conical cavity of the second contact 2 is solidified with a second silica gel sealing sleeve 21.AsFigure 2 As shown, the second silica gel sealing sleeve 21 is engaged with the insulating rubber sleeve 4 in a toothed structure to limit the fitting along the axial direction of the second contact 2. Correspondingly, the outer periphery of the circuit breaker contact is also solidified with a layer of silica gel for sealing.

[0038] The second silica gel sealing sleeve 21 not only has better insulation performance, but also has greater elasticity, and the surface has a higher dry friction coefficient. As we know, the friction between objects and the vertical pressure of the contact surface, the surface friction coefficient (roughness) are positively correlated. When the second contact 2 and the circuit breaker contact are closely connected in the axial direction, the modified silica gel on the surface of the two is extruded and accumulates elastic recovery force, so that the vertical pressure of the contact surface is larger; at the same time, the second silica gel sealing sleeve 21 has a higher dry friction coefficient on the contact surface, so that the second contact 2 and the circuit breaker contact have a stronger friction force and are not easy to loosen in the axial direction. The insulating rubber sleeve 4 wrapped around the end of the second contact 2 extends radially outward by a certain width, and a plurality of second threaded holes 22 are arranged in the extension section in the circumferential direction, so as to be connected with the contact of the circuit breaker through electric bolts, thereby improving the stability of the connection. The sealing and stability of the connection between the second contact 2 and the circuit breaker contact avoid the infiltration or retention of air on the contact surface, and improve the anti-breakdown performance of the connection.

[0039] It can be understood that the first contact 1 also has a first silica gel sealing sleeve 11 solidified on the surface of the tapered body to realize the extractable connection with the contact of the external incoming line. The first silica gel sealing sleeve 11 and the second silica gel sealing sleeve 21 are similar in material and structure, and will not be described here.

[0040] As shown in the drawings, Figure 4 For the existing bus sleeve, the second contact 2 is fixed after being connected with the circuit breaker, and the connecting part 3 and the first contact 1 are cantileveredly arranged in the bus chamber. When the first contact 1 is plugged with the external incoming line, the bus sleeve is stressed in the axial direction of the first contact 1. Due to the lack of axial support to first time offset the external force brought by plugging, the connection between the connecting part 3 and the first contact 1, the second contact 2 is easy to accumulate small deformation due to repeated stress, thereby causing structural looseness, affecting the usability and durability of the bus sleeve. In addition, this external force will also bring a not small torque to the connection between the second contact 2 and the circuit breaker, which will affect the sealing of this place over time.

[0041] To solve this problem, as shown in the drawings, Figure 5As shown, the busbar sleeve extends axially out of the support part 5 on the side of the first contact 1 away from the external incoming line. Overall, the busbar sleeve is in the shape of "h". In this embodiment, the support part 5 and the insulating sleeve 4 are designed in one piece, i.e. the material of the support part 5 is also epoxy resin, which is easy to process and can avoid the accumulation of electric charges at the junction of two different materials, thereby improving the insulation performance. The support part 5 is provided with a plurality of concave first threaded holes 51 at the end, and when the busbar sleeve is installed in the busbar chamber, the support part 5 is supported on the partition plate 6 in a detachable manner by electric bolts. In this way, when the first contact 1 is plugged in or pulled out, the support part 5 transmits and offsets the external force in the axial direction with the help of the partition plate 6. This change from a cantilever structure to a statically determinate structure makes the overall structure of the busbar sleeve more stable and reliable.

[0042] As shown in Figure 3 or Figure 5 As shown, the connecting part 3 abandons the traditional round corner structure at the junction with the first contact 1 and the second contact 2, and adopts a more direct right angle structure, making the busbar sleeve structure more compact and reducing the setting space of the entire busbar chamber. Compared with the traditional round corner structure, this structure also brings new problems: the electric charges on the surface of the conductor are easy to accumulate at the right angle, causing the local current inside the busbar sleeve to be too large. In order to solve this problem, as shown in Figure 3 or Figure 5 As shown, the insulating sleeve 4 is thickened at the junction of the connecting part 3 with the first contact 1 and the second contact 2, thereby improving the insulation performance at this place. As a weak point of the structure, the right angle is often the part where stress is concentrated, so from another point of view, the insulating sleeve 4 is thickened around the junction, which not only balances the stress in all directions, but also enhances the rigidity of this place to resist the stress concentration effect, thereby improving the structural stability.

[0043] In this embodiment, a semiconductive shielding layer is also solidified outside the insulating sleeve 4, and in this embodiment, the semiconductive shielding layer adopts a micro-nano aqueous semiconductive material. The semiconductive shielding layer can more evenly disperse electric charges to the surface of the insulator to reduce the strength of the local electric field, and achieve reliable electric field shielding effect on the surface of the busbar sleeve, thereby improving the safety in use.

[0044] Embodiment Two

[0045] As shown in Figure 6As shown, the utility model embodiment provides a kind of B-phase extractable bus duct, and its difference with embodiment one is as follows: the bus duct of B-phase and the bus duct of A-phase are arranged in step in bus chamber, i.e. the height of both is staggered, therefore, compared with the bus duct of A-phase, the connecting portion 3 of the bus duct of B-phase is shorter in length.Except the above difference, the bus duct of B-phase provided by the embodiment is same with embodiment one.

[0046] In summary, the utility model embodiment one and embodiment two provide a kind of extractable bus duct, extend the support portion 5 on the side of the first contact 1, the support portion 5 is supported in the partition 6 of bus chamber, the external force brought by the first contact 1 insertion and extraction is transferred, offset.This kind of change from cantilever structure to statically determinate structure improves the structural reliability of the bus duct.Secondly, the connecting portion 3 and the first contact 1, second contact 2 adopt right-angle structure at junction, make the bus duct structure more compact;To achieve this structure, the insulation rubber sleeve 4 is thickened at the junction, not only improves the insulation performance, also makes the bus duct more stable.Meanwhile, the bus duct is wrapped with equal-thickness epoxy resin insulation rubber sleeve 4, realizes full insulation solid seal.On the surface of the insulation rubber sleeve 4, still be provided with a layer of micro-nano water-based semiconductive material, realizes reliable electric field shielding effect, to improve the use safety of the bus duct.In addition, the second contact 2, the first contact 1 and adjacent circuit component adopt extractable connection, it is convenient to repair or replace alone, greatly reduce the operation and maintenance cost of switch cabinet.

[0047] The above is only the preferred specific embodiment of the utility model, not limit the patent range of the utility model, and all equivalent transformations using the utility model specification content, belong to the protection scope of the utility model.

Claims

1. An extractable bus duct provided in a bus chamber of a switchgear, characterized by: The conductive body is surrounded by an insulating rubber sleeve; The conductive body has a first contact and a second contact; the first contact and the second contact are arranged axially offset and face different directions; The busbar sleeve is provided with a support part on the side facing away from the first contact; the support part extends along the axial direction parallel to or coinciding with the first contact; When the busbar sleeve is installed in the busbar chamber, the second contact is connected to other circuit components in the switch cabinet in a withdrawable manner; the support part is supported on the partition plate of the busbar chamber to fix the first contact in the axial direction.

2. An extractable bus duct as defined in claim 1, wherein: The support part and the insulating rubber sleeve are configured as a whole, i.e., the support part and the insulating rubber sleeve are integrally cast by using the same material.

3. An extractable bus duct as defined in claim 1, wherein: The extension direction of the support part is the same as the axial direction of the first contact.

4. An extractable bus duct as defined in claim 1, wherein: The end of the support part is provided with a plurality of first threaded holes for detachable connection with the partition plate by electric bolts.

5. An extractable bus duct as defined in claim 1, wherein: The first contact and the second contact are arranged axially parallel and face opposite directions.

6. An extractable bus duct as defined in claim 1, wherein: The conductive body further comprises a connecting part; one end of the connecting part is connected perpendicularly to the first contact, and the other end is connected perpendicularly to the second contact.

7. An extractable bus duct as defined in claim 6, wherein: The insulating rubber sleeve is thickened at the outer periphery of the junction between the connecting part and the first contact and the second contact; the thickened insulating rubber sleeve is symmetrically distributed about the junction.

8. An extractable bus duct as defined in claim 1, wherein: The second contact is configured with an inwardly recessed conical cavity, and a second silica gel sealing sleeve is solidified on the inner wall of the conical cavity.

9. An extractable bus duct as defined in claim 1, wherein: The first contact is configured as a conical body, and a first silica gel sealing sleeve is solidified on the outer periphery of the conical body.

10. An extractable bus duct as defined in claim 1, wherein: The surface of the insulating rubber sleeve is solidified with a semiconductive shielding layer.

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