Safety type vacuum circuit breaker

Abstract

The utility model relates to a safety type vacuum circuit breaker, comprising a box body, the box body is provided with a plurality of poles, the box body is provided with an opening and closing operation handle and an energy storage operation handle, the opening and closing operation handle and the energy storage operation handle respectively comprise a rotating shaft and a handle, the rotating shaft penetrates out of the box body from the inside of the box body and is fixedly connected with the handle, and the handle is fixedly connected with the opening and closing operation handle. The rotating shaft is rotatably sleeved with a sealing sleeve and a fixing base, the fixing base is fixedly connected to the box body, the sealing sleeve is connected with the fixing base, the rotating shaft is fixedly connected with an installation sleeve frame located in the sealing sleeve, and the two sides of the installation sleeve frame are each provided with a movable ring arranged outside the rotating shaft in a sleeving mode; the side, facing the movable ring, of the sealing sleeve and the side, facing the movable ring, of the fixing base are fixedly connected with static rings, the installation sleeve frame is provided with an elastic mechanism used for pushing the movable ring to abut against the static rings, rainwater and dust can be effectively prevented from entering the space between the rotating shaft and the box body, the service life is long, and the safety performance is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum circuit breakers, in particular to a safety vacuum circuit breaker. Background Art

[0002] A vacuum circuit breaker is a high-voltage electrical device that uses vacuum as an arc extinguishing and insulating medium. It is widely used in the distribution, transmission and control systems of power systems, and is mainly used to cut off and connect load currents and fault currents. Its working principle is based on the high insulation performance and excellent arc extinguishing characteristics in a vacuum environment. Its structure mainly includes a vacuum arc extinguishing chamber, an operating mechanism, a current transformer, a transmission mechanism, etc. The transmission mechanism is used to connect the operating mechanism and the arc extinguishing chamber to transmit the operating force, and the operating mechanism usually adopts a miniaturized spring operating mechanism, which is placed in a sealed box. The operating mechanism can be manual or electric. Among them, in the manually operated circuit breaker, there are operating handles for opening and closing, and energy storage operating handles. People can control the vacuum circuit breaker by turning different operating handles. The corresponding operating handles are provided with arrow-mounted markings to prompt people to rotate in the direction.

[0003] In order to prevent rainwater from flowing from the rotating shaft of the handle into the box of the operating mechanism, thereby affecting the overall arc extinguishing effect of the switch, and causing safety problems such as short circuit, a protective cover is fixedly provided on the rotating shaft of the operating handle to cover the penetration point of the rotating shaft on the box, a sealing ring made of rubber is provided on the outside of the box, the side of the protective cover away from the box is sealed, the protective cover is provided with an opening and the sealing ring seals the opening, the rotating shaft passes through the protective cover, a threaded section is provided on the rotating shaft, and a pair of fastening nuts for clamping and fixing the protective cover are provided on the threaded section, that is, when the rotating shaft rotates, the protective cover rotates with the rotating shaft, and the side of the protective cover facing the box rotates relative to the sealing ring. After the rotating shaft is used for a long time, this structure is very likely to cause leakage problems due to wear of the sealing ring caused by repeated rotations, or aging of the sealing ring exposed to the outside, and its sealing effect is relatively general. In view of this problem, the present application makes improvements. Utility Model Content

[0004] The utility model provides a safe vacuum circuit breaker, which can effectively prevent rainwater and dust from entering between the rotating shaft and the box body, has a long service life and high safety performance, and solves the above problems existing in the use process of the prior art.

[0005] The technical solution of the utility model is achieved as follows: a safe vacuum circuit breaker comprises a box body, a plurality of poles are arranged on the box body, a separation and combination operating handle and an energy storage operating handle are arranged on the box body, the separation and combination operating handle and the energy storage operating handle both comprise a rotating shaft and a handle, the rotating shaft penetrates into the box body and out of the box body, and is fixedly connected to the handle, a sealing sleeve and a fixing seat are arranged on the rotating sleeve outside the rotating shaft, the fixing seat is fixedly connected to the box body, the sealing sleeve is connected to the fixing seat, a mounting sleeve frame located in the sealing sleeve is fixedly connected to the rotating shaft, dynamic rings sleeved outside the rotating shaft are arranged on both sides of the mounting sleeve frame, the sealing sleeve and the fixing seat are fixedly connected with a static ring on the side facing the dynamic ring, and an elastic mechanism for pushing the dynamic ring to bear against the static ring is arranged on the mounting sleeve frame.

[0006] Preferably, a first sealing ring is provided between the moving ring and the rotating shaft.

[0007] Preferably, the dynamic ring is slidably arranged between the mounting sleeve and the rotating shaft, and the elastic mechanism is an elastic pad.

[0008] Preferably, a plurality of through holes are radially opened in the middle of the mounting sleeve, screw rods are arranged in the through holes, and the screw rods are fixedly connected to the rotating shaft.

[0009] Preferably, the sealing sleeve includes a first flange, the fixing seat includes a corresponding second flange, and the box body is provided with threaded holes corresponding to the first flange and the second flange.

[0010] Preferably, a second sealing ring is provided between the fixing seat and the box body, and a third sealing ring is provided between the sealing sleeve and the fixing seat.

[0011] Preferably, the sealing sleeve and the fixing seat are fixedly connected to the stationary ring by bonding.

[0012] In summary, the beneficial effects of the present invention are:

[0013] 1. The utility model has a sealing sleeve and a fixing seat on the rotating sleeve outside the rotating shaft. When the rotating shaft rotates, it drives the mounting sleeve frame and the moving ring to rotate relative to the static ring. The moving ring always maintains abutment with the static ring through an elastic mechanism. This structure can effectively prevent rainwater and dust from entering between the rotating shaft and the box body, has a long service life, and high safety performance.

[0014] 2. The first sealing ring prevents rainwater and dust from passing between the driven ring and the rotating shaft, thereby improving the protective effect inside the box.

[0015] 3. The second sealing ring is used to prevent rainwater and dust from passing through between the fixing seat and the box body, and the third sealing ring is used to prevent rainwater and dust from passing through between the sealing sleeve and the fixing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the sealing sleeve and the fixing seat in the utility model.

[0019] In the figure: 1, box body; 11, threaded hole; 2, pole; 31, opening and closing operating handle; 32, energy storage operating handle; 301, rotating shaft; 302, handle; 41, sealing sleeve; 411, first flange; 42, fixing seat; 421, second flange; 43, mounting bracket; 431, limit block; 432, through hole; 44, moving ring; 45, static ring; 46, first sealing ring; 47, elastic pad; 48, screw; 491, second sealing ring; 492, third sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the attached embodiment of the utility model Figure 1-2 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example:

[0022] like Figure 1 to Figure 2As shown, the utility model discloses a safety vacuum circuit breaker, including a box body 1, a plurality of poles 2 are arranged on the box body 1, and a separation and combination operating handle 31 and an energy storage operating handle 32 are arranged on the box body 1, and the separation and combination operating handle 31 and the energy storage operating handle 32 both include a rotating shaft 301 and a handle 302, the rotating shaft 301 penetrates through the box body 1 and is fixedly connected to the handle 302, the utility model is provided with a sealing sleeve 41 and a fixing seat 42 on the outer rotating sleeve of the rotating shaft 301, the fixing seat 42 is fixedly connected to the box body 1, and the sealing sleeve 41 is connected to the fixing seat 42, and a mounting sleeve frame 43 located in the sealing sleeve 41 is fixedly connected to the rotating shaft 301, and the mounting sleeve Both sides of the frame 43 are provided with a moving ring 44 sleeved outside the rotating shaft 301. It should be noted that the moving ring 44 is slidably set between the mounting sleeve 43 and the rotating shaft 301 and can move axially, but the moving ring 44 is limited by the limit block 431 on the mounting sleeve 43, so the moving ring 44 cannot rotate relative to the rotating shaft 301 and the mounting sleeve 43. In addition, the sealing sleeve 41 and the fixing seat 42 are both fixedly connected with a static ring 45 on the side facing the moving ring 44, and an elastic mechanism for pushing the moving ring 44 to resist the static ring 45 is provided on the mounting sleeve 43. In this embodiment, the elastic mechanism is an elastic pad 47. Of course, the elastic mechanism can also be a wave spring or a butterfly spring. In the utility model, when the handle 302 drives the rotating shaft 301 to rotate, the rotating shaft 301 drives the mounting sleeve 43 and the moving ring 44 to rotate relative to the static ring 45. The moving ring 44 always maintains abutment with the static ring 45 through the elastic mechanism. This structure can effectively prevent rainwater and dust from entering from between the rotating shaft 301 and the box body 1, and the moving ring 44 and the static ring 45 are not exposed to the outside, so the service life is long and the safety performance is high.

[0023] Furthermore, a first sealing ring 46 is provided between the dynamic ring 44 and the rotating shaft 301 . The first sealing ring 46 can prevent rainwater and dust from passing through between the dynamic ring 44 and the rotating shaft 301 , thereby improving the protection effect on the inside of the box body 1 .

[0024] The specific structure of the mounting sleeve 43 fixed on the rotating shaft 301 is that a plurality of through holes 432 are radially opened in the middle of the mounting sleeve 43, and a screw 48 is provided in the through hole 432. The screw 48 is fixedly connected to the rotating shaft 301, so that the mounting sleeve 43 can be firmly and reliably fixed on the rotating shaft 301.

[0025] The specific structure of fixing the fixing seat 42 and the sealing sleeve 41 on the box body 1 is that the sealing sleeve 41 includes a first flange 411, and the fixing seat 42 includes a corresponding second flange 421. The box body 1 is provided with threaded holes 11 corresponding to the first flange 411 and the second flange 421. Therefore, the fixing seat 42 and the sealing sleeve 41 can be fixed to the box body 1 by passing a screw through the first flange 411 and the second flange 421 and then being threadedly connected in the threaded hole 11.

[0026] In the utility model, a second sealing ring 491 is provided between the fixing seat 42 and the box body 1, and a third sealing ring 492 is provided between the sealing sleeve 41 and the fixing seat 42. The second sealing ring 491 is used to prevent rainwater and dust from passing through between the fixing seat 42 and the box body 1, and the third sealing ring 492 is used to prevent rainwater and dust from passing through between the sealing sleeve 41 and the fixing seat 42.

[0027] In the present invention, the sealing sleeve 41 and the fixing seat 42 are fixedly connected to the stationary ring 45 by bonding.

[0028] The dynamic ring 44 can be made of soft materials to adapt to the slight deflection and vibration of the rotating shaft and reduce wear, such as graphite impregnated with metal or resin, filled plastic (such as polytetrafluoroethylene-based material), carbon graphite, etc., while the static ring 45 uses hard materials to provide a stable sealing surface and a longer service life, such as nickel-chromium steel, chrome steel, carbon steel, cemented carbide, ceramics, etc.

[0029] It should also be pointed out that the terms used in the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety vacuum circuit breaker, comprising a box, a plurality of poles are arranged on the box, a separation and closing operating handle and an energy storage operating handle are arranged on the box, the separation and closing operating handle and the energy storage operating handle both comprise a rotating shaft and a handle, the rotating shaft penetrates into the box and out of the box, and is fixedly connected to the handle, characterized in that: The rotating sleeve outside the rotating shaft is provided with a sealing sleeve and a fixed seat, the fixed seat is fixedly connected to the box body, the sealing sleeve is connected to the fixed seat, the rotating shaft is fixedly connected with a mounting sleeve frame located in the sealing sleeve, both sides of the mounting sleeve frame are provided with dynamic rings mounted outside the rotating shaft, the sealing sleeve and the fixed seat are fixedly connected with a static ring on the side facing the dynamic ring, and the mounting sleeve frame is provided with an elastic mechanism for pushing the dynamic ring to resist the static ring.

2. A safety vacuum circuit breaker according to claim 1, characterized in that: A first sealing ring is arranged between the moving ring and the rotating shaft.

3. A safety vacuum circuit breaker according to claim 2, characterized in that: The dynamic ring is slidably arranged between the mounting sleeve and the rotating shaft, and the elastic mechanism is an elastic pad.

4. A safety vacuum circuit breaker according to claim 1, characterized in that: A plurality of through holes are radially opened in the middle of the mounting sleeve, screw rods are arranged in the through holes, and the screw rods are fixedly connected to the rotating shaft.

5. A safety vacuum circuit breaker according to claim 1, characterized in that: The sealing sleeve includes a first flange, the fixing seat includes a corresponding second flange, and the box body is provided with threaded holes corresponding to the first flange and the second flange.

6. A safety vacuum circuit breaker according to claim 1, characterized in that: A second sealing ring is arranged between the fixing seat and the box body, and a third sealing ring is arranged between the sealing sleeve and the fixing seat.

7. A safety vacuum circuit breaker according to claim 1, characterized in that: The sealing sleeve and the fixing seat are both fixedly connected to the stationary ring by bonding.

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