An arc extinguishing cover for high-speed circuit breaker

Abstract

The present invention discloses an arc extinguishing hood for a high-speed circuit breaker, specifically relates to the technical field of arc extinguishing hoods, including an arc extinguishing hood shell composed of a side shell and a back shell, wherein arc extinguishing grids are installed at intervals on the inner side of the arc extinguishing hood shell, and arc discharge ports are provided on the back shell, which penetrate the arc extinguishing hood shell and are staggered with the intervals between two arc extinguishing grids, wherein the arc discharge ports form a gradually larger through groove from the inside to the outside and the side close to the arc extinguishing grid is the inner side, and a hollow heat dissipation sleeve is installed in the cavity wall of the arc discharge port, and the heat dissipation sleeve is detachably installed with the arc discharge port. The present invention, by changing the original arc discharge port structure, prevents the circuit breaker from being filled with impurities due to the arc discharge port being too large in diameter and the severe backflow during the arc discharge process, while the heat is discharged through the small diameter of the arc discharge port to the large diameter, further improving the efficiency and sufficiency of heat extraction.

Description

Technical Field

[0001] The present invention relates to the technical field of arc extinguishing hoods, and more particularly to an arc extinguishing hood for a high-speed circuit breaker. Background Art

[0002] The high-speed circuit breaker structure is mainly used to connect and disconnect the high-voltage circuits of urban rail transit vehicles. When a short circuit or overload fault occurs in the main circuit, the main power supply is quickly cut off. The high-speed circuit breaker is mainly composed of the main circuit, tripping device, coupling device, auxiliary contacts and arc extinguishing hood. The arc extinguishing hood is a device that allows the arc to contact with the solid medium, reduce the arc temperature, and thus accelerate the extinction of the arc.

[0003] When the arc extinguishing hood is working, although the arc discharge port has a certain effect of dissipating heat when the arc is cut off by the arc extinguishing grid, the heat of each section of the arc is inconsistent when the arc is cut off by the arc extinguishing grid. The arc discharge port cannot ensure that the heat is quickly and fully discharged, and the arc extinguishing performance of the arc extinguishing hood is poor. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an arc extinguishing hood for a high-speed circuit breaker, comprising an arc extinguishing hood outer shell composed of a side shell and a back shell, arc extinguishing grids are installed at intervals on the inner side of the arc extinguishing hood outer shell, and arc discharge ports that penetrate the back shell and are staggered with the intervals between two arc extinguishing grids are opened on the back shell, the arc discharge ports are gradually enlarged from the inside to the outside, and the side close to the arc extinguishing grid is the inner side, and the arc discharge ports have different sizes and are staggered and evenly distributed on the back shell.

[0005] In a preferred embodiment, a hollow heat dissipation sleeve is sleeved in the cavity wall of the arc discharge port, and the heat dissipation sleeve is detachably mounted to the arc discharge port.

[0006] In a preferred embodiment, a clamping groove and a clamping rod for connecting the heat dissipation sleeve and the arc discharge port are provided between the opposite surfaces of the heat dissipation sleeve and the arc discharge port. When the heat dissipation sleeve is installed in the inner cavity of the arc discharge port, the clamping rod is clamped in the clamping groove.

[0007] In a preferred embodiment, an elastically stretchable upper stretching plate is provided at the connection between the arc-extinguishing grid and the arc-extinguishing hood shell.

[0008] In a preferred embodiment, the connection between the arc extinguishing grid and the arc extinguishing hood shell is provided with an adjustment gap located in the arc extinguishing hood shell, which allows the arc extinguishing grid to move relative to the arc extinguishing hood shell, and the arc extinguishing hood shell is provided with a fixing groove that passes through the arc extinguishing grid and the arc extinguishing grid, and the fixing groove is provided with a limiting through rod for fixing the position of the arc extinguishing grid in the arc extinguishing hood shell.

[0009] In a preferred embodiment, each two of the position-limiting penetrating rods are connected via a connecting rod or a connecting plate, and a through hole penetrating the connecting plate is formed on the connecting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1-2 It is a schematic diagram of the overall structure of the present invention;

[0011] Figure 3 It is a partial cross-sectional structural schematic diagram of the arc discharge port in the present invention;

[0012] Figure 4 It is a schematic diagram of the independent structure of the heat dissipation sleeve and the arc discharge port in the present invention.

[0013] Explanation of reference numerals: 11 side shell, 12 back shell, 2 arc extinguishing grid, 3 arc discharge port, 41 upper stretching plate, 42 adjusting gap, 51 fixing groove, 52 limiting through rod, 531 connecting rod, 532 connecting plate, 61 heat dissipation sleeve plate, 621 clamping groove, 622 clamping rod. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0015] like Figure 1-4 The arc extinguishing hood for high-speed circuit breaker shown in the figure comprises an arc extinguishing hood outer shell composed of a side shell 11 and a back shell 12, arc extinguishing grids 2 are installed at intervals on the inner side of the arc extinguishing hood outer shell, arc discharge ports 3 are opened on the back shell 12, which penetrate the arc extinguishing hood and are staggered with the intervals between the arc extinguishing grids 2, the arc discharge ports 3 are gradually larger from the inside to the outside, and the side close to the arc extinguishing grid 2 is the inner side, the arc discharge ports 3 are of different sizes and are staggered and evenly distributed on the back shell 12, and the arc discharge ports 3 can be polygonal or circular with different sizes from the inside to the outside The channels are composed of structures of different sizes and shapes, and are staggered and evenly distributed on the back shell 12. During the operation of the arc extinguishing cover, the heat generated cannot be discharged from the arc extinguishing gap in time. During the process of heat discharge through the arc discharge port 3, the heat is discharged through the small aperture of the arc discharge port 3 through the large aperture of the arc discharge port 3 in turn. While preventing the circuit breaker from being filled with impurities due to the large aperture of the arc discharge port 3 and severe backflow during the arc discharge process, the heat is discharged from the small aperture of the arc discharge port 3 to the large aperture, which further improves the efficiency and sufficiency of heat extraction.

[0016] A hollow heat dissipation sleeve 61 is installed in the cavity wall of the arc discharge port 3, and the heat dissipation sleeve 61 and the arc discharge port 3 are detachably installed. In the process of heat being discharged through the arc discharge port 3, the heat impacting the arc discharge port 3 will cause the cavity wall and the hollow space to heat up, thereby directly reducing the heat extraction rate. The discharged heat is effectively dissipated through the heat dissipation sleeve 61, which reduces the heat impact while making the arc discharge port 3 have a certain heat dissipation property, thereby improving the efficiency of heat extraction.

[0017] A card slot 621 and a card rod 622 are provided between the opposite surfaces of the heat dissipation sleeve 61 and the arc discharge port 3 to connect the two. When the heat dissipation sleeve 61 is installed in the inner cavity of the arc discharge port 3, the card rod 622 is clamped in the card slot 621. The combined effect of the card slot 621 and the card rod 622 makes the heat dissipation sleeve 61 detachable relative to the arc discharge port 3, which is convenient for immediate replacement of the heat dissipation sleeve 61.

[0018] An elastically stretchable upper stretching plate 41 is provided at the connection between the arc extinguishing grid 2 and the arc extinguishing hood shell. During the arc extinguishing process, heat impacts the arc extinguishing grid 2, and the arc extinguishing grid 2 presses or stretches the upper stretching plate 41 to make it slightly elastically deformed, so that the gap between every two arc extinguishing grids 2 can adapt to the channel needs of heat impact in different sections; an adjustment gap 42 is provided at the connection between the arc extinguishing grid 2 and the arc extinguishing hood shell, which is located in the arc extinguishing hood shell and allows the arc extinguishing grid 2 to move relative to the arc extinguishing hood shell. A fixing groove 51 that passes through the arc extinguishing grid 2 and the arc extinguishing hood shell is provided, and a fixing groove 51 is provided in the fixing groove 51 to fix the position of the arc extinguishing grid 2 in the arc extinguishing hood shell The limiting penetration rod 52 is used. When the arc extinguishing cover is installed, the size of the gap between the opposite surfaces of each two arc extinguishing grids 2 is adjusted according to the needs of arc extinguishing work, and then the corresponding limiting penetration rod 52 is passed through the fixing groove 51 at the corresponding position to fix the position of the arc extinguishing grid 2 in the arc extinguishing cover shell; every two limiting penetration rods 52 are connected via a connecting rod 531 or a connecting plate 532, and a through hole passing through the connecting plate 532 is provided on the connecting plate 532. The limiting penetration rods 52 are connected to each other. When fixing the position of the arc extinguishing grid 2 relative to the arc extinguishing cover shell, the limiting penetration rod 52 can be directly installed as a whole in the corresponding fixing groove 51, which is more convenient to install.

[0019] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. An arc extinguishing hood for a high-speed circuit breaker, comprising an arc extinguishing hood outer shell composed of a side shell and a back shell, wherein arc extinguishing grids are installed at intervals on the inner side of the arc extinguishing hood outer shell, and characterized in that: the back shell is provided with arc discharge ports that penetrate the back shell and are staggered with the intervals between two arc extinguishing grids, the arc discharge ports are gradually larger from the inside to the outside, and the side close to the arc extinguishing grid is the inner side, and the arc discharge ports have different sizes and are staggered and evenly distributed on the back shell; A hollow heat dissipation sleeve is sleeved in the cavity wall of the arc discharge port, and the heat dissipation sleeve is detachably mounted on the arc discharge port; A clamping groove and a clamping rod are provided between the opposite surfaces of the heat dissipation sleeve and the arc discharge port to connect the two. When the heat dissipation sleeve is installed in the inner cavity of the arc discharge port, the clamping rod is clamped in the clamping groove; An elastically stretchable upper stretching plate is provided at the connection between the arc-extinguishing grid and the arc-extinguishing cover shell; An adjustment gap is provided at the connection between the arc extinguishing grid and the arc extinguishing cover shell, which is located in the arc extinguishing cover shell and allows the arc extinguishing grid to move relative to the arc extinguishing cover shell. A fixing groove is provided on the arc extinguishing cover shell and passes through the arc extinguishing grid and the arc extinguishing grid. A limiting through rod is provided in the fixing groove to fix the position of the arc extinguishing grid in the arc extinguishing cover shell.

2. The arc extinguishing hood for high-speed circuit breaker according to claim 1, characterized in that: Every two position-limiting through-rods are connected via a connecting rod or a connecting plate, and a through hole penetrating the connecting plate is provided on the connecting plate.

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