High-voltage isolation sleeve, and isolation switch, solid-sealed polar pole and circuit breaker equipped with high-voltage isolation sleeve

Abstract

The invention discloses a high-pressure isolation sleeve which comprises a sleeve body and an isolation flange. The isolation flanges are arranged at the two ends of the sleeve body. The sleeve body comprises at least one extension section; the extension section is cylindrical or truncated cone-shaped; and the inner wall of the extension section is flat. A receding opening is formed in the position, close to the center, of the isolation flange. The two receding openings in the two ends of the high-voltage isolation sleeve are coaxially arranged. The isolation flange extends towards the direction far away from the sleeve body to form an embedding part; when the high-voltage isolation sleeve is arranged in a circuit, the embedding parts tightly wrap adjacent conductors. The inner wall of the high-voltage isolation sleeve abandons a traditional high-voltage umbrella skirt structure and is constructed to be in a flat form, the problems that demolding is difficult and the yield is low are solved, and the production benefit is greatly improved; meanwhile, the isolation flange enables the high-voltage isolation sleeve to have excellent insulation performance. The invention further discloses an isolating switch, a solid-sealed polar pole and a circuit breaker which are respectively provided with the high-voltage isolating sleeve.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage electrical equipment, and in particular to a high-voltage isolating sleeve and an isolating switch, a sealed pole and a circuit breaker equipped with the sleeve. Background Art

[0002] The high-voltage isolation sleeve is an important component of the high-voltage circuit breaker. It can effectively isolate the high voltage of the high-voltage circuit and prevent voltage and current leakage or short circuit to ensure the normal operation of the working circuit.

[0003] The existing three-station isolating circuit breaker usually sets a high-voltage isolating sleeve in the grounding part and the closing part of the isolating switch to ensure that the high and low voltage fractures have high insulation performance. In the prior art, the inner wall of the high-voltage isolating sleeve in the isolating switch, especially the high-voltage isolating sleeve in the grounding part, is often constructed as a high-voltage umbrella skirt structure to increase the creepage distance of the current on the surface of the insulator. In the production process, after the high-voltage isolating sleeve is cast and formed, the flexible mold inside it needs to be pulled outward toward the openings at both ends of the sleeve to fall off the surface of the umbrella skirt segment. However, the umbrella skirt segment and the flexible mold are mutually engaged and mutually limited in the pulling direction, which not only makes the demoulding process difficult and inefficient, but also, on the other hand, the umbrella skirt segment with greater brittleness is very easy to break due to the lateral pulling of the flexible mold, resulting in a low yield rate of the high-voltage isolating sleeve. Therefore, it is necessary to invent a high-voltage isolating sleeve that has excellent insulation performance while avoiding the problem of difficult production and manufacturing to improve the product yield rate. Summary of the invention

[0004] The main technical problem to be solved by the present invention is to provide a high-voltage isolation sleeve which has excellent insulation performance and is easy to produce.

[0005] In order to solve the above technical problems, the present invention provides a high-voltage isolation sleeve, comprising a sleeve body and an isolation flange; the isolation flange is arranged at both ends of the sleeve body;

[0006] The sleeve body comprises at least one extension section; the extension section is cylindrical or truncated cone-shaped; the inner wall of the extension section is flat;

[0007] The isolation flange is provided with a clearance opening at a position close to the center; the two clearance openings at both ends of the high-voltage isolation sleeve are coaxially arranged;

[0008] The isolation flange extends an engaging portion in a direction away from the sleeve body; when the high-voltage isolation sleeve is arranged in a circuit, the engaging portion tightly wraps the adjacent conductor.

[0009] In a preferred embodiment, on any axial cross section of the high-voltage isolation sleeve, the high-voltage isolation sleeve is provided with arc chamfers at the corners and structural intersections.

[0010] In a preferred embodiment, the engaging portion is circular and closed in the circumferential direction.

[0011] In a preferred embodiment, the engaging portion extends in a direction parallel to the axis of the sleeve body.

[0012] In a preferred embodiment, the material of the high-voltage isolation sleeve includes nylon and glass fiber material.

[0013] In a preferred embodiment, the sleeve body includes two or more extension sections; the extension sections are coaxially arranged and arranged in a stepped manner.

[0014] In a preferred embodiment, the sleeve body extends radially outward to form a viewing window; the viewing window is used to observe the interior of the isolation sleeve.

[0015] The present invention also provides an isolating switch equipped with the high-voltage isolating sleeve described above.

[0016] In a preferred embodiment, the isolating switch adopts a direct-acting three-position isolating structure; the isolating switch is provided with a grounding chamber, an isolating chamber, and a closing chamber along the axial direction;

[0017] The closing chamber is provided with the high-voltage isolating sleeve without a visible window as described above; the grounding chamber is provided with the high-voltage isolating sleeve with a visible window as described above.

[0018] The present invention also provides a sealed pole equipped with the above-mentioned isolating switch; the sealed pole also includes an arc extinguishing device; the arc extinguishing device and the isolating switch form a conductive circuit.

[0019] The present invention also provides a circuit breaker equipped with the aforementioned sealed pole; the circuit breaker also includes a supporting structure for fixing the sealed pole.

[0020] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0021] The inner wall of the high-voltage isolation sleeve provided by the present invention abandons the traditional high-voltage umbrella skirt structure and is instead constructed in a flat shape, thereby avoiding the problems of difficult demoulding and low yield during production, and greatly improving production efficiency.

[0022] The high-voltage isolation sleeve provided by the present invention is provided with the isolation flanges at both ends, and the isolation flanges extend outwardly from the interlocking portion to tightly wrap the adjacent conductors, so that the high-voltage isolation sleeve is stably connected and effective composite insulation is formed between the high and low voltage ends, thereby improving the insulation performance.

[0023] When the high-voltage isolation sleeve provided by the present invention is used as a grounding sleeve, the visual window is extended laterally, which facilitates the user to observe the working state of the circuit where the grounding sleeve is located, thereby improving its usability.

[0024] The isolating switch, the sealed pole and the circuit breaker provided by the present invention are equipped with the above-mentioned high-voltage isolating sleeve, which not only ensures the insulation performance but also has higher production efficiency and usability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional schematic diagram of a circuit breaker according to an embodiment of the present invention;

[0026] Figure 2 is a cross-sectional schematic diagram of a circuit breaker according to an embodiment of the present invention;

[0027] Figure 3 is a three-dimensional schematic diagram of the sealed pole described in an embodiment of the present invention;

[0028] Figure 4 is a cross-sectional schematic diagram of the sealed pole described in an embodiment of the present invention;

[0029] Figure 5 is a three-dimensional schematic diagram of the isolation sleeve described in an embodiment of the present invention;

[0030] Figure 6 is a cross-sectional schematic diagram of the isolation sleeve described in an embodiment of the present invention;

[0031] Figure 7 is a three-dimensional schematic diagram of the grounding sleeve described in an embodiment of the present invention;

[0032] Figure 8 Schematic diagram of the cross section of the grounding sleeve in the embodiment of the present invention.

[0033] The markings in the figure are: 1- withdrawable sealed pole, 11- isolating switch, 111- grounding cavity, 1111- grounding conductor, 11111- grounding port, 1112- grounding sleeve, 11121- second sleeve body, 11122- second isolation flange, 11123- visual window, 112- isolation cavity, 1121- isolation conductor, 113- closing cavity, 1131- isolation sleeve, 11311- first sleeve body, 11312- first isolation flange, 11313- clearance opening, 11 314-fitting part, 114-first outgoing conductor, 115-moving contact assembly, 1151-screw rod, 1152-sliding contact body, 1153-reversing transmission member, 116-contact finger spring, 12-vacuum switch, 121-arc extinguishing chamber, 1211-static contact, 1212-moving contact, 1213-arc extinguishing cover, 1214-voltage equalizing cover, 122-conduction chamber, 123-second outgoing conductor, 13-connecting conductor, 14-insulating rubber sleeve, 2-support seat, 21-end plate, 22-base, 3-circuit breaker. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] like Figures 1 to 8As shown, the embodiment of the present invention provides a high-voltage isolating sleeve, and an isolating switch 11, a sealed pole 1 and a circuit breaker 3 equipped with the high-voltage isolating sleeve. In order to more conveniently understand the technical solution, the structure and function of the above-mentioned device are described in the order of structural relationship from large to small.

[0038] In general, the circuit breaker 3 includes an "L"-shaped support base 2 and a sealed pole 1. The sealed pole 1 is a "T"-shaped structure as a whole, and is statically fixed to the support base 2. Specifically, the support base 2 includes an "L"-shaped base 22, and an end plate 21 vertically arranged on the base 22. The sealed pole 1 includes an isolating switch 11 and a vacuum switch 12, and the isolating switch 11 is provided with a grounding terminal. The grounding terminal of the isolating switch 11 is vertically fixed to the end plate 21, and its end away from the grounding terminal extends in a horizontal direction. The top of the vacuum switch 12 is vertically connected to the bottom of the isolating switch 11, and the bottom is vertically fixed to the horizontal section of the base 22.

[0039] For the convenience of description, the direction of the support seat 2 is now defined. The horizontal direction of the support seat 2 parallel to the axis of the disconnector 11 is defined as the width direction, and the horizontal direction perpendicular to the axis of the disconnector 11 is defined as the length direction. In this embodiment, the number of the sealed poles 1 is three. The three sealed poles 1 are arranged at intervals along the length direction of the support seat 2.

[0040] Now, with reference to the drawings, the structure and connection relationship of each component of the sealed pole 1 will be further described.

[0041] like Figure 1 to Figure 4 As shown, the isolating switch 11 adopts a direct-acting three-position isolating structure, and is provided with a grounding chamber 111, an isolating chamber 112 and a closing chamber 113 in sequence in the axial direction. The first outgoing conductor 114 is extended axially from the side of the closing chamber 113 away from the isolating chamber 112. The first outgoing conductor 114 is a male connector.

[0042] The grounding cavity 111 is provided with a grounding conductor 1111 on one side close to the end plate 21, and the grounding conductor 1111 is fixed to the end plate 21 by bolts. It can be understood that the isolating switch 11 is provided with one end of the grounding cavity 111, namely the grounding end mentioned above. In this embodiment, the grounding conductor 1111 extends from the side to the grounding end 11111, and the grounding end 11111 is cast with an insulating rubber sleeve 14 on the periphery together with other components of the isolating switch 11, which is not only more convenient to install, but also improves the insulation performance of the grounding end. A grounding sleeve 1112 is provided between the grounding conductor 1111 and the isolation cavity 112 to construct a vacuum cavity of the grounding cavity 111. It is necessary that the grounding sleeve 1112 has better insulation and connection sealing. This part of the content will be explained separately below. In particular, in this embodiment, the grounding sleeve 1112 extends a visual window 11123 on the upper side to facilitate timely acquisition of the conduction state of the isolating switch 11. In order not to affect the vacuum environment in the grounding cavity 111, the top of the visible window 11123 is sealed by transparent materials such as glass or acrylic.

[0043] The closing chamber 113 is arranged at one end close to the first outlet conductor 114, and a vacuum chamber is constructed by an isolation sleeve 1131. In this embodiment, the isolation sleeve 1131 is used in conjunction with the grounding sleeve 1112, so its specific structure is described separately below together with the grounding sleeve 1112. One end of the isolation sleeve 1131 is tightly connected to the first outlet conductor 114. In the isolation chamber 112 located between the grounding chamber 111 and the closing chamber 113, a through-length isolation conductor 1121 is axially arranged. One end of the isolation conductor 1121 is tightly connected to the grounding sleeve 1112, and the other end is tightly connected to the isolation sleeve 1131. At the junction of the isolating switch 11 and the vacuum switch 12 , the isolating conductor 1121 extends a connecting conductor 13 on the side facing the vacuum switch 12 , and the connecting conductor 13 extends into the arc extinguishing chamber 121 of the vacuum switch 12 to achieve electrical connection between the isolating switch 11 and the vacuum switch 12 .

[0044] In order to understand the three-position isolation working mode of the isolation switch 11, the structure and mechanical coordination of the moving contact assembly 115 are now described. Figure 1 or Figure 3As shown, the moving contact assembly 115 includes a screw rod 1151, a sliding contact body 1152 and a reversing transmission member 1153. The isolating switch 11 is constructed to be hollow in the length range from the end plate 21 to the first outgoing conductor 114, so as to provide the necessary axial space for the installation of the screw rod 1151 and the movement of the sliding contact body 1152. The screw rod 1151 extends as a whole along the axial direction of the isolating switch 11, and one end is rotatably connected to the end plate 21 through the reversing transmission member 1153. The connection method here is a more common prior art or its replacement means, which will not be described in detail in this article. The sliding contact body 1152 is sleeved on the outer periphery of the screw rod 1151, and is axially sealed and slidably connected with the screw rod 1151 through threaded cooperation. When the screw rod 1151 is driven by the driving device in the end plate 21 to rotate, the screw rod 1151 realizes reversing transmission by cooperating with the thread of the sliding contact body 1152, and pushes the sliding contact body 1152 to move along the axial direction of the disconnector 11. It is necessary that the length of the sliding contact body 1152 is not less than the clear distance from the grounding conductor 1111 to the isolation conductor 1121, and is not less than the clear distance from the isolation conductor 1121 to the first outgoing conductor 114. When one end of the sliding contact 1212 contacts the grounding conductor 1111, the other end thereof will inevitably contact the isolating conductor 1121, and at this time, the isolating switch 11 is in the grounding closed state; when the sliding contact body 1152 moves away from the end plate 21 to leave the grounding conductor 1111 and does not contact the first outgoing conductor 114, the isolating switch 11 is in the grounding open state; and when the sliding contact body 1152 continues to move in the same direction until one end abuts against the first outgoing conductor 114, the other end thereof will inevitably contact the isolating conductor 1121, and at this time, the isolating switch 11 is in the isolating closed and grounding open state. This is the three-position isolating working mode of the isolating switch 11. It can be understood that by switching the rotation direction of the screw rod 1151 and pushing the sliding contact body 1152 to move in the reverse direction, the isolating switch 11 still follows the three-position isolating working mode. It is not difficult to understand that in this working mode, the ground conductor 1111, the isolation conductor 1121 and the first outgoing conductor 114 can be defined as fixed contacts.

[0045] In order to ensure good contact between the sliding contact body 1152 and each fixed contact, the cross section of the hollow cavity in the fixed contact should match the cross section of the sliding contact body 1152. However, due to production errors and wear and tear, it is inevitable that there will be a small gap between the sliding contact body 1152 and each fixed contact, thereby affecting the contact stability. Therefore, further, if Figure 1 or Figure 3As shown, a finger spring 116 is provided at the end of each of the fixed contacts. The finger spring 116 is pre-tightened so that the inner diameter is slightly smaller than the diameter of the sliding contact body 1152. When the sliding contact body 1152 penetrates the finger spring 116, the finger spring 116 is stretched open to generate an inward elastic force, thereby holding the sliding contact body 1152. In this way, a stable and reliable conductive circuit is formed between the sliding contact body 1152 and each of the fixed contacts. In other embodiments, a circle of elastic fingers may be provided on the surface of the sliding contact body 1152 along the circumferential direction, and the surface of the elastic fingers smoothly transitions with the sliding contact body 1152. When the sliding contact body 1152 enters the hollow cavity of each of the fixed contacts, the elastic fingers are pressed inward and abut against the surface of the fixed contact body, which can also form a stable conductive circuit between the sliding contact body 1152 and each of the fixed contacts.

[0046] It is not difficult to understand that the isolation sleeve 1131 and the grounding sleeve 1112 in this embodiment are the high-voltage isolation sleeves mentioned above. Since the isolation sleeve 1131 and the grounding sleeve 1112 have similar overall structures, the isolation sleeve 1131 is mainly described to explain the structures of the isolation sleeve 1131 and the grounding sleeve 1112.

[0047] like Figure 5 , Figure 6 As shown, the isolation sleeve 1131 is shaped like a gas bottle, including a first sleeve body 11311 and a first isolation flange 11312. The extension section of the first sleeve body 11311 is constructed in a cylindrical shape, and the corner is constructed in an arc shape. The first isolation flange 11312 is shaped like the bottom of a gas bottle and is arranged at both ends of the first sleeve body 11311. The comparison of the shapes of the isolation sleeve 1131 and the first isolation flange 11312 is for a better understanding of the technical solution, rather than a limitation. The only two limiting structural features are: the inner wall of the isolation sleeve 1131 is flat; and the isolation sleeve 1131 is provided with a first isolation flange 11312 at both ends. The inner wall of the existing isolation sleeve 1131 is often constructed in an umbrella skirt shape to increase the creepage distance of the current on the surface of the insulator. During the production process, after the isolation sleeve 1131 is cast and formed, the flexible mold inside it needs to be pulled outward toward the openings at both ends of the sleeve to fall off the surface of the umbrella skirt segment. However, the umbrella skirt segment and the flexible mold are mutually engaged and mutually limited in the pulling direction, which not only makes the demoulding process difficult and inefficient, but also, on the other hand, the umbrella skirt segment with greater brittleness is very easy to break due to the lateral pulling of the flexible mold, resulting in a low yield rate of the isolation sleeve. Therefore, in this embodiment, the inner wall of the isolation sleeve 1131 is constructed in a flat shape, which avoids the above-mentioned problems existing during demoulding and greatly improves production efficiency.

[0048] In order to compensate for the contribution of the shed section inside the traditional isolation sleeve to the insulation performance, the isolation sleeve 1131 is provided with the first isolation flange 11312 at the end. The first isolation flange 11312 is provided with a circular clearance opening 11313 near the center for the screw rod 1151 and the sliding contact body 1152 to pass through. The first isolation flange 11312 is perpendicular to the axis of the first sleeve body 11311, and the two clearance openings 11313 located at both ends of the isolation sleeve 1131 are coaxially arranged. In this embodiment, in order to increase the creepage distance of the current and improve the insulation performance of the isolation sleeve 1131, the diameter of the clearance opening 11313 is equal to the outer diameter of the sliding contact body 1152. The first isolation flange 11312 extends a circle of fitting parts 11314 along the axis direction of the first sleeve body 11311 in the direction away from the first sleeve body 11311. The engaging portion 11314 is circular in shape and closed in the circumferential direction. Figure 1 or Figure 3 It can be seen that when the isolation sleeve 1131 is installed in the isolation cavity 112, the first isolation flange 11312 tightly wraps the first outlet conductor 114 at the high-voltage end and the isolation conductor 1121 at the low-voltage end through the fitting portion 11314, so that the isolation sleeve 1131 is firmly connected to the above-mentioned conductors while effectively blocking the conduction of current between the high and low voltage ends. In this way, a stable composite insulation is formed between the first outlet conductor 114 and the isolation conductor 1121, thereby improving the insulation of the isolation cavity 112. It can be understood that the high-voltage end and the low-voltage end are relative. Furthermore, from the perspective of any axial section of the isolation sleeve 1131, the isolation sleeve 1131 is provided with arc chamfers at the corners and structural intersections for smooth transition, which can avoid the tip effect of the charge and thereby improve the insulation performance of the isolation sleeve 1131. In this embodiment, the material used for the isolation sleeve 1131 and the grounding sleeve 1112 is composited with materials such as nylon and glass fiber. Nylon and glass fiber have good high temperature resistance and insulation properties, so that the isolation sleeve 1131 and the grounding sleeve 1112 have excellent working performance.

[0049] In other embodiments, the isolation sleeve 1131 can be coaxially arranged with two or more extension sections of different radii to form a stepped structure. During production, the flexible mold inside the sleeve can be taken out from the opening of the wider extension section without affecting the demolding process. As an equivalent alternative, the extension section itself can also be truncated. For those skilled in the art, this transformation is a common replacement method in the industry and should not depart from the scope of protection of the present invention.

[0050] like Figure 7 , Figure 8 As shown, the material of the grounding sleeve 1112 is the same as that of the isolation sleeve 1131, and the overall structure is similar to that of the isolation sleeve 1131. The inner wall of the second sleeve body 11121 of the grounding sleeve 1112 is flat, and second isolation flanges 11122 are also provided at both ends to tightly wrap the grounding conductor 1111 and the isolation conductor 1121 to form an effective composite insulation in the grounding cavity 111. As mentioned above, unlike the isolation sleeve 1131, the grounding sleeve 1112 extends the visual window 11123 on the upper side, so that the user can observe the position of the sliding contact 1152, thereby judging the conduction state of the isolation switch 11.

[0051] In this embodiment, the vacuum switch 12 is the arc extinguishing device described in the claims, and forms a complete conductive circuit with the isolating switch. Figure 1 or Figure 3 As shown, the vacuum switch 12 includes an arc extinguishing chamber 121 and a conduction chamber 122. A pull rod structure is axially arranged in the conduction chamber 122. A static contact 1211 and a moving contact 1212 are axially arranged in the arc extinguishing chamber 121. The static contact 1211 is fixed on a side close to the disconnector 11 and is connected to the connecting conductor 13. The moving contact 1212 is arranged on a side close to the conduction chamber 122, and reciprocates along the axial direction of the arc extinguishing chamber 121 under the drive of the pull rod structure to abut or separate from the static contact 1211. The vacuum switch 12 extends the second outgoing conductor 123 in the lateral direction, and the end of the outgoing conductor is electrically connected to the moving contact 1212 through a flexible connector. In this way, when the pull rod structure pushes the moving contact 1212 to abut against the static contact 1211, the circuit between the second outgoing conductor 123 and the isolation conductor 1121 in the isolating switch 11 is turned on. When the pull rod structure pulls the moving contact 1212 away from the static contact 1211, the circuit from the second outgoing conductor 123 to the isolation conductor 1121 is cut off. In this embodiment, the axial directions of the second outgoing conductor 123 and the first outgoing conductor 114 are parallel to each other and face the same direction. The vacuum cavity in the arc extinguishing chamber 121 is constructed by an arc extinguishing hood 1213. The material of the arc extinguishing hood 1213 can be ceramic, metal, resin-based composite material, glass fiber composite material, etc. As a prior art, this article does not limit this. A uniform cover is provided on the periphery of the arc extinguishing cover 1213 , and the voltage-equalizing cover 1214 can reduce the uneven distribution of the electric field, thereby reducing the insulation breakdown caused by partial discharge and improving the insulation performance and breaking stability of the arc extinguishing chamber 121 .

[0052] like Figure 1 to Figure 4As shown, a layer of insulating rubber sleeve 14 is integrally cast on the periphery of the disconnector 11 and the vacuum switch 12 to achieve solid full insulation of the solid-sealed pole 1. In this example, the disconnector 11 and the vacuum switch 12 are in a "T"-shaped structure as a whole, so the insulating rubber sleeve 14 not only plays an insulating role, but also plays an important structural support role for the disconnector 11 and the vacuum switch 12, especially for the vertical intersection of the two. In this embodiment, the insulating rubber sleeve 14 adopts epoxy resin with high breakdown strength and toughness. In addition, a semi-conductive shielding layer is cured on the surface of the insulating rubber sleeve 14. The semi-conductive shielding layer can disperse the charge more evenly to 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 solid-sealed pole 1, thereby improving the safety of use. In this embodiment, the semi-conductive shielding layer adopts a micro-nano water-based semi-conductive material.

[0053] 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 high voltage isolation sleeve, characterized in that: It comprises a sleeve body and an isolation flange; the isolation flange is arranged at both ends of the sleeve body; The sleeve body comprises at least one extension section; the extension section is cylindrical or truncated cone-shaped; the inner wall of the extension section is flat; The isolation flange is provided with a clearance opening at a position close to the center; the two clearance openings at both ends of the high-voltage isolation sleeve are coaxially arranged; The isolation flange extends an engaging portion in a direction away from the sleeve body; when the high-voltage isolation sleeve is arranged in a circuit, the engaging portion tightly wraps the adjacent conductor.

2. A high voltage isolation sleeve according to claim 1, characterized in that: On any axial cross section of the high-voltage isolation sleeve, the high-voltage isolation sleeve is provided with arc chamfers at the corners and structural intersections.

3. A high voltage isolation sleeve according to claim 1, characterized in that: The fitting portion is configured in a circular shape and is closed in the circumferential direction.

4. A high voltage isolation sleeve according to claim 1, characterized in that: The engaging portion extends in a direction parallel to the axis of the sleeve body.

5. A high voltage isolation sleeve according to claim 1, characterized in that: The material of the high-voltage isolation sleeve includes nylon and glass fiber material.

6. A high voltage isolation sleeve according to claim 1, characterized in that: The sleeve body includes two or more extension sections; the extension sections are coaxially arranged and arranged in a stepped manner.

7. A high voltage isolation sleeve according to any one of claims 1 to 6, characterized in that: The sleeve body extends radially outward to form a viewing window; the viewing window is used to observe the interior of the isolation sleeve.

8. An isolating switch, characterized in that: Equipped with a high-voltage isolation sleeve as claimed in any one of claims 1 to 7.

9. The isolating switch according to claim 8, characterized in that: A direct-acting three-position isolation structure is adopted; the isolating switch is provided with a grounding cavity, an isolation cavity, and a closing cavity along the axial direction; A high-voltage isolation sleeve as described in any one of claims 1 to 6 is arranged in the closing chamber; a high-voltage isolation sleeve as described in claim 7 is arranged in the grounding chamber.

10. A sealed pole, characterized in that: Equipped with a disconnector as described in any one of claims 8 or 9; the sealed pole also includes an arc extinguishing device; the arc extinguishing device and the disconnector form a conductive circuit.

11. A circuit breaker, characterized in that: The circuit breaker is equipped with a sealed pole as claimed in claim 10; the circuit breaker also includes a supporting structure for fixing the sealed pole.

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