Insulating cylinder for arc extinguish chamber of circuit breaker

Abstract

The utility model belongs to the field of high-voltage circuit breakers, and discloses an insulating cylinder for an arc extinguish chamber of a circuit breaker, which can maintain the matching stability of flanges of the insulating cylinder under the working condition of larger vibration so as to ensure the effectiveness of physical isolation of the arc extinguish chamber, and comprises a pair of lap joint hoops, the two ends of the insulating cylinder are respectively hooped on the convex part circumferential surface of the nozzle convex surface flange and the convex part circumferential surface of the shielding cover convex surface flange; the insulating cylinder is hooped on the nozzle protruding face flange and the shielding cover protruding face flange through the pair of lap joint hoop rings so as to ensure that the insulating cylinder cannot fall off from the circumferential face of the protruding portion of the nozzle protruding face flange and / or the circumferential face of the protruding portion of the shielding cover protruding face flange.

Description

Technical Field

[0001] The utility model belongs to the field of high-voltage circuit breakers, and in particular relates to an insulating cylinder used in an arc extinguishing chamber of a circuit breaker. Background Art

[0002] The insulating cylinder is a commonly used component of high-voltage circuit breakers. It is arranged near the nozzle of the arc extinguishing chamber through flange cooperation to physically isolate the inside of the arc extinguishing chamber from the outside.

[0003] However, when the circuit breaker is opened, the insulating cylinder often vibrates due to the impact force caused by the circuit breaker opening action. When the vibration is too large, the insulating cylinder is at risk of falling off due to flange failure, thereby causing failure of the physical isolation of the arc extinguishing chamber. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an insulating cylinder for an arc extinguishing chamber of a circuit breaker, which can maintain the stability of the flange fit of the insulating cylinder under conditions of large vibration, thereby ensuring the effectiveness of physical isolation of the arc extinguishing chamber.

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

[0006] An insulating cylinder for an arc extinguishing chamber of a circuit breaker, the two ends of which are respectively sleeved on the nozzle raised surface flange of the nozzle of the arc extinguishing chamber and the shielding cover convex surface flange at the end of the shielding cover; it is characterized in that it includes: a pair of lap hoop rings, which respectively clamp the two ends of the insulating cylinder on the convex surface of the nozzle raised surface flange and the convex surface of the shielding cover convex surface flange.

[0007] Preferably, a pair of lap hoop rings are electrically connected to the body end face of the nozzle raised face flange and the body end face of the shield convex face flange respectively through elastic abutment conductors.

[0008] Furthermore, the end face of the lap hoop ring facing the main body end face of the nozzle raised face flange or the main body end face of the shield cover convex face flange is used as the conducting end face, and a plurality of accommodating blind holes are evenly formed on the conducting end face along its own circumference, and the abutting conductor is a conductive spring, and the two ends are respectively abutted on the main body end face of the nozzle raised face flange and the inner surface of the accommodating blind hole; or the two ends are respectively abutted on the main body end face of the shield cover convex face flange and the inner surface of the accommodating blind hole.

[0009] Furthermore, the end face of the lap hoop ring facing the main body end face of the nozzle raised face flange or the main body end face of the shield cover convex face flange is used as a conducting end face, and the conducting end face forms a continuously closed accommodating ring groove along its own circumference, and the abutting conductor is a spring contact finger embedded in the inside of the accommodating ring groove, and the two sides respectively abut on the main body end face of the nozzle raised face flange and the inner surface of the accommodating ring groove; or the two ends respectively abut on the main body end face of the shield cover convex face flange and the inner surface of the accommodating ring groove.

[0010] Preferably, the lap hoop ring is interference fit with the convex circumference of the nozzle raised face flange or the convex circumference of the shielding cover raised face flange by a shrink fitting process, and the inner surface of the lap hoop ring is coated with epoxy resin glue.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. Because the insulating tube used for the arc extinguishing chamber of the circuit breaker of the utility model includes a pair of lap hoop rings, which respectively clamp the two ends of the insulating tube on the convex circumference of the nozzle raised face flange and the convex circumference of the shielding cover convex flange, that is, the insulating tube is clamped on the nozzle raised face flange and the shielding cover convex face flange by a pair of lap hoop rings to ensure that the insulating tube will not fall off from the convex circumference of the nozzle raised face flange and / or the convex circumference of the shielding cover convex face flange. Therefore, the utility model can maintain the stability of the insulating tube flange fit under the condition of large vibration, thereby ensuring the effectiveness of physical isolation of the arc extinguishing chamber.

[0013] 2. Because a pair of lap hoop rings of the utility model are electrically connected to the main end faces of the nozzle raised face flange and the main end faces of the shield cover convex face flange through elastic abutment conductors, the utility model can ensure that the metal lap hoop ring and the nozzle raised face flange and the shield cover convex face flange always maintain electrical connection, so that corona will not appear in the insulation test due to the conductive gap between the lap hoop ring and the nozzle raised face flange and the shield cover convex face flange.

[0014] 3. Because the lap hoop of the utility model is interference fit with the convex circumference of the nozzle raised face flange or the convex circumference of the shielding cover raised face flange through the shrink fitting process, and the inner surface of the lap hoop is coated with epoxy resin glue, the utility model can still keep the lap hoop to tighten the insulating tube to the nozzle raised face flange and the shielding cover raised face flange when the lap hoop and the nozzle raised face flange and the shielding cover raised face flange move relative to each other due to strong vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of an implementation of an insulating cylinder for an arc extinguishing chamber of a circuit breaker according to the first embodiment of the utility model;

[0016] Figure 2 for Figure 1Schematic diagram of the plane;

[0017] Figure 3 It is a planar implementation schematic diagram of an insulating cylinder used in an arc extinguishing chamber of a circuit breaker according to the second embodiment of the utility model.

[0018] In the figure: 100, an insulating cylinder for an arc extinguishing chamber of a circuit breaker, F1, a nozzle raised surface flange, F2, a shielding cover raised surface flange, 1, a lap hoop ring, 1a, a receiving blind hole, 1b, a receiving ring groove, 2, abutting a conductor. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and drawings specifically illustrate the insulating cylinder for the arc extinguishing chamber of the circuit breaker of the present invention. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0020] <Example 1>

[0021] like Figure 1 and Figure 2 As shown, the insulating cylinder 100 for the arc extinguishing chamber of the circuit breaker in this embodiment has its two ends respectively sleeved on the nozzle convex flange F1 of the nozzle of the arc extinguishing chamber (not shown in the drawings) and the shielding cover convex flange F2 at the end of the shielding cover (not shown in the drawings).

[0022] An insulating cylinder 100 for an arc extinguishing chamber of a circuit breaker comprises a lap collar 1 and an abutting conductor 2 .

[0023] The number of the lap hoop rings 1 is a pair, which respectively clamp the two ends of the insulating tube 100 used for the arc extinguishing chamber of the circuit breaker on the convex circumference of the nozzle raised surface flange F1 and the convex circumference of the shielding cover convex flange F2. The lap hoop ring 1 is interference fit with the convex circumference of the nozzle raised surface flange F1 or the convex circumference of the shielding cover convex flange F2 through a heat-shrink process, and the inner surface of the lap hoop ring 1 is coated with epoxy resin glue. In addition to the heat-shrink process, the insulating tube 100 of the circuit breaker arc extinguishing chamber is pressed against the lap hoop ring 1, and the epoxy resin glue also bonds the insulating tube 100 of the circuit breaker arc extinguishing chamber to the lap hoop ring 1. Specifically, the material of the lap hoop ring 1 is a metal ring.

[0024] The end face of the lap hoop ring 1 facing the main body end face of the nozzle raised face flange F1 or the main body end face of the shield convex face flange F2 is used as a conducting end face (not shown in the drawings), and a plurality of accommodating blind holes 1a are uniformly formed on the conducting end face along its circumference.

[0025] A pair of lap hoop rings 1 are electrically connected to the main body end faces of the nozzle raised face flange F1 and the main body end faces of the shield cover convex face flange F2 respectively through elastic abutting conductors 2, and the abutting conductors 2 are conductive springs, and the two ends thereof are respectively abutted on the main body end faces of the nozzle raised face flange F1 and the inner surface of the accommodating blind hole 1a; or the two ends thereof are respectively abutted on the main body end faces of the shield cover convex face flange F2 and the inner surface of the accommodating blind hole 1a. In the present embodiment, the number of abutting conductors 2 and the accommodating blind holes 1a are both four, and the abutting conductors 2 are arranged one-to-one inside the accommodating blind holes 1a.

[0026] <Example 2>

[0027] In the second embodiment, the same symbols are given to the same structures as those in the first embodiment, and the same descriptions are omitted.

[0028] In the second embodiment, the insulating cylinder 100 used in the arc extinguishing chamber of the circuit breaker is different from that in the first embodiment in that:

[0029] like Figure 3 As shown, the conducting end surface forms a continuous closed receiving annular groove 1b along its circumference, rather than a receiving blind hole 1a.

[0030] The abutting conductor 2 is a spring contact and is embedded in the inside of the accommodating ring groove 1b, and its two sides respectively abut on the main body end face of the nozzle raised surface flange F1 and the inner surface of the accommodating ring groove 1b; or its two ends respectively abut on the main body end face of the shielding cover convex surface flange F2 and the inner surface of the accommodating ring groove 1b.

[0031] The above-mentioned implementation modes are preferred cases of the present utility model and are not used to limit the protection scope of the present utility model. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the protection scope of this patent.

Claims

1. An insulating cylinder for an arc extinguishing chamber of a circuit breaker, wherein both ends of the insulating cylinder are respectively sleeved on a nozzle convex flange of a nozzle of the arc extinguishing chamber and a shield convex flange at the end of the shield; characterized in that: include: A pair of lap hoop rings respectively clamp the two ends of the insulating tube tightly on the convex peripheral surface of the nozzle raised surface flange and the convex peripheral surface of the shielding cover convex surface flange.

2. The insulating cylinder for the arc extinguishing chamber of a circuit breaker according to claim 1, characterized in that: in, The pair of lap hoop rings are electrically connected to the main body end surface of the nozzle raised face flange and the main body end surface of the shield convex face flange through elastic abutment conductors respectively.

3. The insulating cylinder for the arc extinguishing chamber of a circuit breaker according to claim 2, characterized in that: in, The end face of the lap hoop ring facing the end face of the main body of the nozzle raised face flange or the end face of the main body of the shield convex face flange is used as a conducting end face, and the conducting end face is uniformly formed with a plurality of accommodating blind holes along its circumference. The abutting conductor is a conductive spring, and its two ends respectively abut on the main body end face of the nozzle raised face flange and the inner surface of the accommodating blind hole; or its two ends respectively abut on the main body end face of the shielding cover convex face flange and the inner surface of the accommodating blind hole.

4. The insulating cylinder for the arc extinguishing chamber of a circuit breaker according to claim 2, characterized in that: in, The end face of the lap hoop ring facing the end face of the main body of the nozzle raised face flange or the end face of the main body of the shield convex face flange is used as a conducting end face, and the conducting end face forms a continuous closed accommodating ring groove along its own circumference. The abutting conductor is a spring contact and is embedded in the inside of the accommodating ring groove, and its two sides respectively abut on the main body end face of the nozzle raised face flange and the inner surface of the accommodating ring groove; or its two ends respectively abut on the main body end face of the shielding cover convex face flange and the inner surface of the accommodating ring groove.

5. The insulating cylinder for the arc extinguishing chamber of a circuit breaker according to claim 1, characterized in that: in, The lap hoop ring is interference-fitted with the convex peripheral surface of the nozzle raised surface flange or the convex peripheral surface of the shielding cover convex flange through a shrink-fit process, and the inner surface of the lap hoop ring is coated with epoxy resin glue.

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