Labyrinth plugging device for conductor frame and insulating support cylinder of circuit breaker

Abstract

The utility model discloses a labyrinth type plugging device for a conductor frame and an insulating support cylinder of a circuit breaker. The plugging device comprises a shielding case with a double-layer cylindrical structure and a protective cover with a cylindrical structure, the shielding cover is connected with the upper shielding end face of the insulating supporting cylinder, an annular cavity with an upward opening is formed between the inner layer and the outer layer of the shielding cover, and the protective cover is connected to the top end of the insulating pull rod and inserted into the annular cavity to divide the annular cavity into a snake-shaped cavity; when the insulating pull rod axially moves, the protective cover is driven to move at the same time, and the protective cover is inserted into the annular cavity, so that a snake-shaped cavity between the top of the insulating pull rod and the inner wall of the shielding case is formed, and the conductor frame of the circuit breaker and the insulating supporting cylinder are plugged. Friction foreign matters and other foreign matters can be prevented from falling into the internal space of the insulating supporting cylinder, so that discharge is prevented, and the operation reliability of equipment is ensured; the device is simple in structure and principle and convenient to disassemble, assemble and use, and has good application and popularization value.

Description

Technical Field

[0001] The utility model belongs to the field of arc extinguishing chambers of GIS circuit breakers, and in particular relates to a labyrinth-type blocking device for a conductor frame and an insulating support cylinder of a circuit breaker. Background Art

[0002] At present, with the rapid development of the economy, higher requirements are put forward for the demand for electric power resources and long-distance transmission. In order to reasonably allocate electric power resources, it is necessary to vigorously develop the UHV industry. The UHV gas-insulated metal equipment (GIS) is the top priority of the entire UHV industry, and plays an important role in protecting other UHV equipment and controlling the allocation of electric power resources. Therefore, the stability and reliability of the operation of the UHV GIS are particularly important. Once a problem occurs, it will cause irreparable losses to users' electricity consumption and corporate development. At the same time, when problems occur, maintenance is also more difficult, the cycle is short and the task is heavy, and the requirements for problem handling are more stringent.

[0003] GIS product insulation failure and breakdown accidents have always been the main problem that plagues switch products, especially the insulation breakdown of the arc extinguishing chamber of the UHV GIS circuit breaker, which is a major accident. The inspection and maintenance time when the product has problems has been compressed again and again. According to statistics, the insulation failure and breakdown of GIS products are mostly caused by the introduction of foreign matter and the friction debris generated by the transmission part being carried by the airflow or randomly falling on the parts, causing discharge, such as Figure 1 As shown, GIS circuit breakers are often operated frequently, and the connecting rod transmission part 7 is prone to produce some friction foreign matter during multiple movements. Since the internal space of the insulating support tube 2 and the circuit breaker conductor frame 6 is completely conductive, the foreign matter produced by friction will fall into the interior of the insulating support tube 2, which may cause discharge and lead to insulation failure and breakdown. Utility Model Content

[0004] In order to overcome the above-mentioned technical defects, the utility model provides a labyrinth-type blocking device for the conductor frame and insulating support tube of a circuit breaker, which can solve the technical problem that the transmission part of the arc extinguishing chamber of the existing circuit breaker and the internal space of the insulating support tube lack blocking measures, which makes it easy for foreign matter to fall into the internal space of the insulating support tube, thereby causing insulation failure and breakdown.

[0005] In order to achieve the above purpose, the utility model adopts the following technical contents:

[0006] A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder, comprising a shielding cover;

[0007] The shielding cover adopts a double-layer cylindrical structure, the inner layer and the outer layer are integrally connected through a bending portion, and an annular cavity with an opening upward is formed between the inner layer and the outer layer, and the insulating pull rod is inserted in the shielding cover;

[0008] The shielding cover is fixedly connected to the shielded end surface on the insulating support tube;

[0009] A protective cover is arranged at the top end of the insulating pull rod. The protective cover adopts a cylindrical structure and is inserted into the annular cavity to divide the annular cavity into serpentine cavities.

[0010] Furthermore, a step structure is provided on the top of the protective cover, and the step structure is located directly above the top of the inner layer of the shielding cover.

[0011] Furthermore, the protective cover is fixed to the end surface of the tie rod joint of the insulating tie rod by means of bolts.

[0012] Furthermore, a guide ring is sleeved on the pull rod joint of the insulating pull rod, and the guide ring and the inner wall surface of the shielding cover are slidably matched to form an axial seal.

[0013] Furthermore, the guide ring is connected to the rod joint of the insulating rod by interference fit.

[0014] Furthermore, the guide ring is made of polytetrafluoroethylene.

[0015] Furthermore, a plurality of screw holes are provided on the end surface of the shielding cover, and the shielding cover is fixed to the shielded end surface on the insulating support tube through the screw holes.

[0016] Furthermore, the bent portion of the shielding cover is arranged in the insulating support tube.

[0017] Furthermore, centers of the insulating pull rod, the shielding cover and the protective cover are located on the same straight line.

[0018] Furthermore, the shielding cover is made of aluminum.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a labyrinth plugging device for a circuit breaker conductor frame and an insulating support tube, the plugging device comprises a shielding cover of a double-layer cylindrical structure and a protective cover of a cylindrical structure; wherein the shielding cover is connected to the shielding end face on the insulating support tube, and an annular cavity opening upward is formed between the inner and outer layers thereof, the protective cover is connected to the top of the insulating pull rod and inserted in the annular cavity, dividing the annular cavity into a serpentine cavity; when the insulating pull rod moves axially, the protective cover is driven to move at the same time, and since the protective cover is inserted in the annular cavity, a serpentine cavity is formed between the top of the insulating pull rod and the inner wall of the shielding cover, thereby realizing the plugging of the circuit breaker conductor frame and the insulating support tube, and being able to ensure that friction foreign matter and other foreign matter will not fall into the internal space of the insulating support tube, thereby preventing discharge and ensuring the reliability of equipment operation; the structure and principle of the device are simple, and it is easy to disassemble and use, and has a high cost performance and good promotion and application value.

[0021] Preferably, in the utility model, a step structure is provided on the top of the protective cover, and is directly above the top of the inner layer of the shielding cover; on the one hand, the overall rigidity of the protective cover can be ensured; on the other hand, collision between the shielding cover and the protective cover is avoided, thereby ensuring the reliability of operation.

[0022] Preferably, in the utility model, a guide ring is sleeved on the rod joint of the insulating rod, and the guide ring can slide axially along the inner wall surface of the shielding cover under the drive of the insulating rod, and the two realize axial sealing; on the one hand, it plays a guiding role in the axial sliding of the insulating rod, making its operation more stable; on the other hand, the formed axial seal can completely achieve the barrier between the circuit breaker conductor frame and the insulating support tube, preventing foreign matter from falling into the internal space of the insulating support tube.

[0023] Preferably, in the utility model, the bent portion of the shielding cover is arranged in the insulating support tube, which meets the insulation performance requirements of the shielding cover installed in the product.

[0024] Preferably, in the utility model, the centers of the insulating rod, the shielding cover and the protective cover are arranged on the same straight line, which further ensures the reliability of the axial sliding of the insulating rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of the connection between the conductor frame and the insulating support cylinder of the existing circuit breaker provided in the embodiment of the utility model;

[0026] Figure 2 A schematic structural diagram of a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support cylinder in an open state provided by an embodiment of the utility model;

[0027] Figure 3A schematic structural diagram of a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support cylinder provided by an embodiment of the utility model in a closed state;

[0028] Figure 4 A partial enlarged view of a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support cylinder provided in an embodiment of the utility model;

[0029] Figure 5 A schematic structural diagram of a shielding cover of a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support cylinder provided in an embodiment of the utility model;

[0030] Figure 6 A schematic diagram of the structure of the shielding on the insulating support cylinder provided by an embodiment of the utility model;

[0031] Figure 7 A cross-sectional view of a protective cover of a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support cylinder provided in an embodiment of the utility model;

[0032] Figure 8 A cross-sectional view of a tie rod joint provided in an embodiment of the utility model;

[0033] Fig. 9 A cross-sectional view of a guide ring provided in an embodiment of the utility model.

[0034] Reference numerals:

[0035] Insulating pull rod-1; insulating support tube-2; shield on insulating support tube-3; circuit breaker housing-4; moving contact connecting rod-5; circuit breaker conductor frame-6; connecting rod transmission part-7; insulating pull rod guide-8; shield cover-9; protective cover-10; pull rod joint-11; guide ring-12. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the following specific embodiments further describe the utility model in detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] The utility model is further described in detail below with reference to the accompanying drawings:

[0044] Example

[0045] In order to better understand the problems in the prior art, the following terms are explained:

[0046] Closing: The mechanism drives the insulating pull rod, the pull rod drives the connecting rod transmission part, and the connecting rod drives the moving contact to move and contact with the static contact to complete the circuit conduction.

[0047] Opening: The mechanism drives the insulating pull rod, the pull rod drives the connecting rod transmission part, and the connecting rod drives the moving contact to move and separate from the static contact.

[0048] like Figure 1 As shown, Figure 1 The circuit breaker includes the connecting rod transmission part, the conductor frame, the insulating support tube and other main structures. In this embodiment, it is an 800kV GIS circuit breaker. The circuit breaker is a key component in GIS and is widely used in ultra-high voltage transmission lines.

[0049] Specifically, it is composed of an insulating pull rod 1, an insulating support tube 2, an insulating support tube upper shield 3, a circuit breaker housing 4, a moving contact connecting rod 5, a circuit breaker conductor frame 6, a connecting rod transmission part 7 and an insulating pull rod guide 8 and other components.

[0050] Among them, the bottom of the insulating support tube 2 is installed and fixed on the circuit breaker housing 4, the insulating support tube upper shield 3 is installed on the insulating support tube 2, the circuit breaker conductor frame 6 falls on the insulating support tube upper shield 3, the connecting rod transmission part 7 and the moving contact connecting rod 5 are both installed on the circuit breaker conductor frame 6, and the insulating support tube 2 and the insulating support tube upper shield 3 jointly support and fix the entire arc extinguishing chamber.

[0051] The operating mechanism (not shown in the figure) drives the insulating rod 1 to move axially (i.e. vertically), and the insulating rod guide 8 guides and limits the vertical movement of the insulating rod 1. The insulating rod 1 drives the connecting rod transmission part 7 to convert the vertical movement into horizontal movement, thereby driving the moving contact connecting rod 5 to make the moving contact and the static contact complete contact and separation, thereby opening and closing the switch. Figure 1 The left side is the closed position, and the right side is the open position.

[0052] Due to the power demand of users, GIS circuit breakers are often operated frequently, and the connecting rod transmission part 7 is prone to produce some friction foreign matter during multiple movements. Since the internal space of the insulating support cylinder 2 and the circuit breaker conductor frame 6 is completely conductive, the foreign matter produced by friction will fall into the inside of the insulating cylinder, which is easy to cause discharge. Therefore, it is urgent to design a solution to isolate the internal space of the insulating support cylinder 2 and the circuit breaker conductor frame 6 to ensure the safe operation of the product.

[0053] It can be seen that the transmission part of the existing circuit breaker arc extinguishing chamber lacks isolation measures from the internal space of the insulating support tube, which makes it easy for foreign matter to fall into the internal space of the insulating support tube, causing insulation failure and breakdown.

[0054] Therefore, in order to solve the above problems, this embodiment provides a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support tube, which can isolate the insulating support tube 2 from the internal space of the circuit breaker conductor frame 6 to ensure safe operation of the product.

[0055] like Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder, and the structure is as follows:

[0056] In this embodiment, a step surface and a threaded hole are processed on the upper shield 3 of the insulating support cylinder.

[0057] Specific as Figure 5 and Figure 6 As shown, the labyrinth plugging device includes a shielding cover 9, wherein the shielding cover 9 is made of aluminum; it has a double-layer cylindrical structure, the inner layer and the outer layer are connected as a whole by folding, and the right-angled bend part at the end face is installed on the step surface of the shield 3 on the insulating support tube, and the two are fixed by bolts, and the bend part extending into the insulating support tube 2 is subjected to key design verification, and a rounded transition treatment is adopted to meet the insulation performance requirements of the shielding cover 9 in the product. An annular cavity with an opening upward is formed between the inner layer and the outer layer of the shielding cover 9.

[0058] The bent portion 9-2 of the shielding cover 9 extends into the gap between the insulating support tube 2 and the insulating pull rod 1, sealing the inner cavity of the circuit breaker conductor frame 6 and the insulating support tube 2, and the shielding cover 9 is connected by bolts. The shielding cover 9 is integrally sleeved on the outside of the insulating pull rod 1, that is, the insulating pull rod 1 passes through the shielding cover 9 and can slide axially in the shielding cover 9.

[0059] like Figure 7 and Figure 8 As shown, the labyrinth-type plugging device also includes a protective cover 10, which adopts a single-layer cylindrical structure, one end of which is fixed on the end face of the rod joint 11 of the insulating rod 1, and the other end is inserted in the annular cavity. The annular cavity is divided into a serpentine cavity similar to a maze by the inserted protective cover 10; the serpentine cavity effectively blocks the circuit breaker conductor frame 6 and the insulating support tube 2; when the insulating rod 1 makes axial movement, due to the structural design of the serpentine cavity, foreign matter can be prevented from falling into the internal space of the insulating support tube 2, thereby preventing discharge and ensuring the safe operation of the circuit breaker equipment.

[0060] In this embodiment, the rod joint 11 of the insulating rod 1 is made of metal aluminum, and an annular groove is made at a suitable position of the rod joint 11, and a threaded hole is processed at the top end thereof.

[0061] like Fig. 9 As shown, in order to further improve the sealing effect, a guide ring 12 is sleeved on the annular groove of the pull rod joint 11 to achieve the sealing between the insulating pull rod 1 and the inner wall of the shielding cover 9; at the same time, it also meets the axial guiding requirements during sliding.

[0062] In this embodiment, a step structure is provided at the top of the protective cover 10, and a straight hole is processed in the step structure. The protective cover 10 is installed on the tie rod joint 11 by bolt connection, and moves axially with the insulating tie rod 1. The protective cover 10 extends into the inner space of the shielding cover 9, that is, extends into the annular cavity of the shielding cover 9, and seals the space between the insulating tie rod 1 and the inner wall of the shielding cover 9 from the top, thereby realizing the sealing of the circuit breaker conductor frame 6 and the insulating support tube 2. Processing the step structure can ensure the overall rigidity of the protective cover and avoid collision between the shielding cover 9 and the protective cover 10.

[0063] This embodiment provides a labyrinth-type sealing device for the conductor frame and insulating support tube of the circuit breaker, which can effectively isolate the transmission part of the arc extinguishing chamber of the circuit breaker from the internal space of the insulating support tube, ensure that friction foreign matter and other foreign matter will not fall into the internal space of the insulating support tube, prevent discharge, and ensure the reliability of equipment operation.

[0064] This embodiment has a simple and reliable structure and is easy to install and operate.

[0065] This embodiment has low cost and high economic efficiency.

[0066] The protective cover of this embodiment is designed with a step surface (step structure), which can not only enhance the strength of the protective cover, but also effectively avoid friction and collision between the protective cover and the shielding cover 9.

[0067] In summary, this embodiment provides a labyrinth-type plugging device for a circuit breaker conductor frame and an insulating support cylinder, which has the following advantages over the prior art:

[0068] The sealing device comprises a shielding cover of a double-layer cylindrical structure and a protective cover of a cylindrical structure; wherein the shielding cover is connected to the shielding end face on the insulating support tube, and an annular cavity opening upward is formed between the inner and outer layers thereof, and the protective cover is connected to the top of the insulating pull rod and inserted in the annular cavity to divide the annular cavity into a serpentine cavity; when the insulating pull rod moves axially, the protective cover is driven to move at the same time, and since the protective cover is inserted in the annular cavity, a serpentine cavity is formed between the top of the insulating pull rod and the inner wall of the shielding cover, thereby achieving the sealing of the circuit breaker conductor frame and the insulating support tube, and being able to ensure that friction foreign matter and other foreign matter will not fall into the internal space of the insulating support tube, thereby preventing discharge and ensuring the reliability of equipment operation; the structure and principle of the device are simple, and it is easy to disassemble and use, and has a high cost performance and good promotion and application value.

[0069] The above embodiment is only one of the implementation methods that can realize the technical solution of the utility model. The scope of protection required by the utility model is not limited only to this embodiment, but also includes within the technical scope disclosed by the utility model, any changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field.

Claims

1. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder, characterized in that: comprising a shielding cover (9); The shielding cover (9) adopts a double-layer cylindrical structure, the inner layer and the outer layer are integrally connected via a bent portion, and an annular cavity with an opening facing upward is formed between the inner layer and the outer layer, and the insulating pull rod (1) is inserted into the shielding cover (9); The shielding cover (9) is fixedly connected to the end surface of the shielding (3) on the insulating support tube; A protective cover (10) is provided at the top end of the insulating pull rod (1); the protective cover (10) is of a cylindrical structure and is inserted into the annular cavity, dividing the annular cavity into serpentine cavities.

2. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: The top of the protective cover (10) is provided with a step structure, and the step structure is located directly above the top of the inner layer of the shielding cover (9).

3. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: The protective cover (10) is fixed to the end surface of the tie rod joint (11) of the insulating tie rod (1) by means of bolts.

4. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: A guide ring (12) is sleeved on the pull rod joint (11) of the insulating pull rod (1), and the guide ring (12) and the inner wall surface of the shielding cover (9) are slidably matched to form an axial seal.

5. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 4, characterized in that: The guide ring (12) is connected to the rod joint (11) of the insulating rod (1) by means of interference fit.

6. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 4, characterized in that: The guide ring (12) is made of polytetrafluoroethylene.

7. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: The end surface of the shielding cover (9) is provided with a plurality of screw holes, and is fixed to the end surface of the shield (3) on the insulating support tube through the screw holes.

8. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: The bent portion of the shielding cover (9) is arranged inside the insulating support tube (2).

9. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: The centers of the insulating pull rod (1), the shielding cover (9) and the protective cover (10) are located on the same straight line.

10. A labyrinth plugging device for a circuit breaker conductor frame and an insulating support cylinder according to claim 1, characterized in that: The shielding cover (9) is made of aluminum.

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