Draw-out type silica gel sealing sleeve structure, bus sleeve and cable sleeve

Abstract

The invention provides a draw-out type silica gel sealing sleeve pipe structure. The draw-out type silica gel sealing sleeve pipe structure comprises a conductor, a silicone rubber layer and an insulating layer, the silicone rubber layer is pre-cast outside the conductor, and the insulating layer wraps the silicone rubber layer; a tubular cavity is formed after the silicon rubber layer is pre-cast, and the two ends of the tubular cavity are open surfaces; the tubular cavity is divided into a first cavity and a second cavity, the first cavity wraps the conductor, and the conductor is electrically connected with other conductors through an opening surface on the side of the first cavity; the second cavity forms an insertion channel for an external electrical contact to be inserted, and the silicone rubber layer has elasticity so that the external electrical contact can be pulled out of the second cavity. The invention further provides a bus sleeve and a cable outlet sleeve. The bus sleeve and the cable outlet sleeve comprise the draw-out type silica gel sealing sleeve structure.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, and in particular to a withdrawable silicone sealing bushing structure, a busbar bushing and a cable bushing. Background Art

[0002] Switchgear is a key device used to control, protect and measure electric energy in power systems. These switchgears contain a variety of electrical components, such as circuit breakers, disconnectors, multi-phase busbars, cables, etc., which are connected together through precise wiring to ensure the stable operation of the power system.

[0003] The existing switch cabinet wiring is designed and manufactured in a fixed or semi-fixed manner into a non-detachable structure, which fixes the circuit breaker module, busbar module, cable module and other components. This wiring method brings a series of technical and operational challenges.

[0004] First, maintenance and replacement are more difficult, which increases maintenance costs and troubleshooting time. The non-detachable wiring method makes the maintenance and replacement of switch cabinets complicated and time-consuming. When the line is aged or needs to be updated, it may be necessary to replace the entire switch cabinet instead of a single line, which increases maintenance costs. At the same time, when a fault occurs, it may take longer to locate and solve the problem because the line cannot be quickly replaced or reconfigured, which increases the troubleshooting time and system downtime. Secondly, it reduces the operational safety during maintenance. The non-detachable wiring method limits the ability to operate a specific line without interfering with other lines, increases the risk that other circuits may be damaged during maintenance, and reduces the safety of operation.

[0005] Finally, this non-detachable wiring method limits the flexibility of the internal space of the switch cabinet. When the position of internal components needs to be adjusted, the non-detachable wiring may become an obstacle, resulting in reduced space utilization efficiency. When the circuit configuration needs to be added or changed, the non-detachable wiring method makes it difficult to make quick adjustments, affecting the flexibility and adaptability of the system. Summary of the invention

[0006] The present invention provides a removable silicone sealing bushing structure, a bus bushing and a cable bushing, which can reduce the cost and time of switch cabinet maintenance and replacement, improve space utilization and system flexibility, and improve safety during maintenance operations.

[0007] In order to solve the above problems, the present invention provides a removable silicone sealing sleeve structure, comprising a silicone rubber layer and an insulating layer; the silicone rubber layer is pre-cast outside the conductor, and the insulating layer wraps the silicone rubber layer; The silicone rubber layer is pre-cast to form a tubular cavity, and both ends of the tubular cavity are open surfaces; The tubular cavity is divided into a first cavity and a second cavity. The first cavity encloses a conductor, and the conductor is electrically connected to other conductors through an opening surface on the side of the first cavity. The second cavity forms a plug-in channel for inserting an external electrical contact, and the silicone rubber layer is elastic so that the external electrical contact can be pulled out of the second cavity.

[0008] In some embodiments, the outer wall of the silicone rubber layer is provided with a plurality of annular grooves along the axial direction.

[0009] In some of the embodiments, an inner wall of the insulating layer is provided with an annular protrusion corresponding one-to-one to the annular groove.

[0010] In some embodiments, the annular groove is provided on the outer wall of the second cavity.

[0011] In some embodiments, the diameter of the second cavity gradually decreases along the insertion direction of the electrical contact to form a tapered insertion channel.

[0012] In some of the embodiments, the insulating layer is wrapped around the silicone rubber layer with equal thickness, so that the insulating layers are symmetrical to each other.

[0013] In some of the embodiments, a semiconductive shielding layer is cured on the surface of the insulating layer.

[0014] In some embodiments, the end of the insulating layer extends radially outward to form an extension section, and at least two threaded holes are arranged on the extension section at intervals along the circumferential direction.

[0015] The present invention also provides a removable silicone rubber busbar bushing, comprising the removable silicone sealing bushing structure mentioned above.

[0016] The present invention also provides a cable sleeve, comprising the above-mentioned withdrawable silicone sealing sleeve structure.

[0017] Compared with the prior art, the beneficial effect of the present invention is that a removable silicone sealing sleeve structure is formed by pre-casting an elastic silicone rubber layer outside the conductor and then wrapping the insulating layer, and the second cavity of the silicone rubber layer forms a plug-in channel, so that when the sealing structure is applied to the busbar or cable, the wiring can be detachable, so that the circuit breaker module, the busbar module, and the cable module can be separated from each other. It can reduce the cost and time of switch cabinet maintenance and replacement, improve space utilization, system flexibility, and improve safety during maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the busbar bushing of phase A in embodiment 1 of the present invention; Figure 2 is a cross-sectional view of the busbar bushing of phase A in embodiment 1 of the present invention; Figure 3 It is a side view of the busbar bushing of phase A in embodiment 1 of the present invention; Figure 4 is a three-dimensional schematic diagram of the silicone rubber layer in Example 1 of the present invention; Figure 5 is a cross-sectional view of the silicone rubber layer in Example 1 of the present invention; Figure 6 It is a three-dimensional schematic diagram of the busbar bushing of phase B in embodiment 2 of the present invention; Figure 7 is a cross-sectional view of a busbar bushing of phase B in embodiment 2 of the present invention; Figure 8 It is a three-dimensional schematic diagram of the busbar bushing of phase C in embodiment 3 of the present invention; Fig. 9 It is a cross-sectional view of the busbar bushing of phase C in embodiment 3 of the present invention; Fig.10 This is a three-dimensional schematic diagram of a cable outlet bushing in Embodiment 4 of the present invention; Fig.11 This is a cross-sectional view of the cable outlet bushing in Example 4 of the present invention.

[0019] 1. First contact; 2. Second contact; 21. Silicon rubber layer; 22. Threaded hole; 211. First cavity; 212. Second cavity; 213. Annular groove; 3. Connecting part; 4. Insulating layer; 41. Annular protrusion. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Example

[0023] Reference Figure 1-5 This embodiment provides a removable silicone rubber busbar bushing for phase A, which is used to be arranged in the busbar chamber of the switch cabinet to electrically connect the incoming line outside the switch cabinet with the circuit components such as the circuit breaker inside. The busbar bushing includes a first contact 1 for the outgoing line and a second contact 2 for the incoming line. The first contact 1 and the second contact 2 are axially staggered and connected by a connecting portion 3. The busbar bushing is provided with a supporting portion on the side facing away from the first contact 1. When the busbar bushing is installed in the busbar chamber, the second contact 2 is connected and fixed to the circuit breaker, and the first contact 1 is cantilevered.

[0024] Among them Figure 2 , Figure 5 As shown, the second contact 2 is provided with a removable silicone sealing sleeve structure, which includes a silicone rubber layer 21 and an insulating layer 4; the silicone rubber layer 21 is pre-cast outside the conductor, and the insulating layer 4 wraps the silicone rubber layer 21, wherein in this embodiment, the insulating layer 4 is made of epoxy resin material; the silicone rubber layer 21 is pre-cast to form a tubular cavity, and both ends of the tubular cavity are open surfaces; the tubular cavity is divided into a first cavity 211 and a second cavity 212, the first cavity 211 wraps the conductor, and the conductor is electrically connected to the conductor arranged inside the connecting part 3 through the open surface on the side of the first cavity 211; the second cavity 212 forms a plug-in channel for the power contact of the circuit breaker to be inserted, and the silicone rubber layer 21 has elasticity so that the external power contact can be withdrawn from the second cavity 212.

[0025] When the power contact of the circuit breaker is inserted into the second cavity 212, the second contact 2 and the circuit breaker contact are tightly connected along the axial direction, and the surface of the circuit breaker contact is also cured with silicone rubber. The inner wall surface of the second cavity 212 and the surface of the circuit breaker contact are squeezed against each other to accumulate elastic restoring force, so that they are tightly grasped. At the same time, due to the strong friction resistance of silicone rubber on the contact surface, the second contact 2 and the circuit breaker contact are not easy to loosen along the axial direction. The insulating layer 4 extends radially outward to a certain width, and at least two threaded holes 22 are arranged at intervals along the circumferential direction on the extension section to be bolted to the contact of the circuit breaker through electrical bolts. The connection between the removable silicone rubber busbar bushing of phase A and the circuit breaker can be achieved in the above manner.

[0026] When the equipment fails and the busbar or circuit breaker needs to be maintained and replaced, the electrical bolts are loosened to contact the bolted connection between the circuit breaker contact and the insulating layer 4. At this time, since the inner silicone rubber layer 21 is elastic, the circuit breaker contact can be pulled out of the second cavity 212 of the second contact 2 by external force, so that the busbar can be withdrawn relative to the circuit breaker. The circuit breaker and busbar can be maintained and replaced separately without disassembling and rearranging the entire wiring system, which greatly saves maintenance costs and time, and also reduces the risk of other circuits during maintenance and improves the safety of operation.

[0027] At the same time, the above-mentioned removable silicone sealing sleeve structure can more effectively utilize the internal space of the switch cabinet. This design allows the limitation of wiring position to be avoided when moving the busbar or circuit breaker, and optimizes the internal space layout. And when it is necessary to increase or change the circuit configuration, it can be adjusted quickly without making large-scale changes to the entire system.

[0028] like Figure 2 , Figure 4 As shown, when the insulating layer 4 made of epoxy resin is coated on the outside of the silicone rubber layer 21, the insulating layer 4 and the silicone rubber layer 21 cannot be fixed as one due to the material properties, and the insulating layer 4 and the silicone rubber layer 21 are prone to movement and dislocation, affecting the sealing performance and the insulation of the sleeve. Therefore, in this embodiment, the outer wall of the second cavity 212 of the silicone rubber layer 21 is provided with a plurality of annular grooves 213 along the axial direction, and the inner wall of the insulating layer 4 is provided with annular protrusions 41 corresponding to the annular grooves 213 one by one, so that a tooth-like bite structure is formed between the insulating layer 4 and the silicone rubber layer 21, and the annular grooves 213 and the annular protrusions 41 are mutually limited along the axial direction, so as to fix the silicone rubber layer 21 and the insulating layer 4 together, prevent the insulating layer 4 and the silicone rubber layer 21 from moving, and improve the sealing and insulation properties.

[0029] The circuit breaker and the removable silicone rubber busbar bushing of phase A are connected to each other in the axial direction by inserting the circuit breaker contact into the second cavity 212. In order to ensure the coaxiality of the circuit breaker contact and the second contact 2 after connection, in this embodiment, the diameter of the second cavity 212 gradually decreases along the insertion direction of the power contact to form a tapered plug-in channel.

[0030] In this embodiment, the connection part 3 and the second contact 2 abandon the traditional rounded structure at the intersection, and adopt a more direct right-angle structure. The charge on the surface of the conductor is easy to gather at the right angle, resulting in excessive local current inside the busbar bushing. The right angle is a weak point of structural stress, and stress concentration often occurs at the right angle. Under the action of high voltage, the insulating layer 4 is easily damaged. Therefore, in order to solve this problem, in this embodiment, the insulating layer 4 is wrapped with equal thickness on the periphery of the silicone rubber layer 21, and is thickened at the intersection of the connection part 3 and the second contact 2, so that the insulating layer 4 is symmetrical around each other, balancing the stress in all directions, and at the same time enhancing the rigidity of the junction to avoid damage to the insulating layer 4 due to stress concentration, thereby improving the stability of the structure.

[0031] In this embodiment, a semi-conductive shielding layer is solidified on the surface of the insulating layer 4. The semi-conductive shielding layer is made of micro-nano water-based semi-conductive material. The semi-conductive shielding layer can disperse the charge more evenly on the surface of the insulator to reduce the intensity of the local electric field, and achieve a reliable electric field shielding effect on the surface of the busbar bushing, thereby improving the safety of use. Example

[0032] Reference Figure 6-7 This embodiment provides a removable silicone rubber busbar bushing for phase B, which differs from embodiment 1 in that the busbar bushing for phase B and the busbar bushing for phase A are arranged in a stepped manner in the busbar chamber, that is, the first contacts 1 of the two outlets are staggered in height, which increases the insulation distance and makes the wiring more regular. Therefore, compared with the busbar bushing for phase A, the connection portion 33 constructed by the busbar bushing for phase B is shorter. Except for the above differences, the rest of the busbar bushing for phase B provided in this embodiment is the same as that in embodiment 1. Similarly, the removable silicone sealing bushing structure described in embodiment 1 is also arranged in the second contact 2 of phase B. Example

[0033] Reference Figure 8-9, this embodiment provides a removable silicone rubber busbar bushing for phase C, which differs from embodiment 1 and embodiment 2 in that, since the busbar bushing of phase C, the busbar bushing of phase B, and the busbar bushing of phase A are arranged in a stepped manner in the busbar chamber, the height of the first contact 1 of phase A is greater than the height of the first contact 1 of phase B, and greater than the height of the first contact 1 of phase C, so that the outlets are staggered in height, the insulation distance is increased, and the wiring is regular. In this embodiment, the first contact 1 and the second contact 2 of the busbar bushing of phase C are coaxially arranged along the axial direction. Except for the above differences, the rest of the busbar bushing of phase C provided in this embodiment is the same as that in embodiment 1, and the removable silicone sealing bushing structure described in embodiment 1 is also arranged in the second contact 2. Example

[0034] Referring to 10-11, this embodiment provides a cable outlet bushing, which is used to be arranged in the cable room of the switch cabinet to electrically connect the vacuum switch and the circuit components such as the cable in the circuit breaker room of the switch cabinet. The cable outlet bushing includes a first contact 1 for the outlet and a second contact 2 for the incoming line, and the first contact 1 and the second contact 2 are coaxially arranged along the axial direction. When the cable outlet bushing is installed in the cable room, the second contact 2 is electrically connected to the outlet contact of the vacuum switch, and the first contact 1 is connected to the current transformer as the outlet contact.

[0035] The second contact 2 is also provided with the removable silicone sealing sleeve structure described in Example 1, so that the circuit breaker and the cable outlet sleeve can be disassembled, which reduces maintenance cost and time, improves operation safety, and optimizes the spatial system layout.

[0036] The second contact 2 is formed of two layers, a silicone rubber layer 21 and an insulating layer 4, and has a larger diameter. Therefore, in order to allow the first contact 1 to adapt to the existing current transformer, the cable outlet bushing forms a stepped structure from the second contact 2 to the first contact 1. The specifications of the first contact 1 can meet the installation of the existing current transformer. A connecting part 3 is arranged between the second contact 2 and the first contact 1. The diameter of the connecting part 3 is smaller than the second contact 2 and larger than the first contact 1, so that the cable outlet bushing forms a stepped structure, which is convenient for the installation of the existing current transformer.

[0037] The rest is the same as Example 1 and will not be described again here.

[0038] The above description is only a preferred specific implementation mode of the present invention, and does not limit the patent scope of the present invention. Any technical equivalent changes made using the contents of the present invention specification shall fall within the protection scope of the present invention.

Claims

1. A removable silicone sealing sleeve structure, characterized in that: It comprises a silicone rubber layer and an insulating layer; the silicone rubber layer is pre-cast outside the conductor, and the insulating layer wraps the silicone rubber layer; The silicone rubber layer is pre-cast to form a tubular cavity, and both ends of the tubular cavity are open surfaces; The tubular cavity is divided into a first cavity and a second cavity. The first cavity encloses a conductor, and the conductor is electrically connected to other conductors through an opening surface on the side of the first cavity. The second cavity forms a plug-in channel for inserting an external electrical contact, and the silicone rubber layer is elastic so that the external electrical contact can be pulled out of the second cavity.

2. The removable silicone sealing sleeve structure according to claim 1, characterized in that: The outer wall of the silicone rubber layer is provided with a plurality of annular grooves along the axial direction.

3. The removable silicone sealing sleeve structure according to claim 2 is characterized in that: The inner wall of the insulating layer is provided with an annular protrusion corresponding one-to-one to the annular groove.

4. The removable silicone sealing sleeve structure according to claim 2, characterized in that: The annular groove is arranged on the outer wall of the second cavity.

5. The removable silicone sealing sleeve structure according to claim 1, characterized in that: The diameter of the second cavity gradually decreases along the insertion direction of the electrical contact to form a tapered insertion channel.

6. The removable silicone sealing sleeve structure according to claim 1, characterized in that: The insulating layer is wrapped around the silicone rubber layer with equal thickness, so that the insulating layers are symmetrical to each other.

7. The removable silicone sealing sleeve structure according to claim 1, characterized in that: A semi-conductive shielding layer is cured on the surface of the insulating layer.

8. The removable silicone sealing sleeve structure according to claim 1, characterized in that: The end of the insulating layer radially extends outward to form an extension section, and at least two threaded holes are arranged on the extension section at intervals along the circumferential direction.

9. A removable silicone rubber busbar bushing, characterized in that: It comprises the removable silicone sealing sleeve structure as described in any one of claims 1 to 8.

10. A cable casing, characterized in that: It comprises the removable silicone sealing sleeve structure as described in any one of claims 1 to 8.

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