Switching device and cavity separator

Abstract

The utility model relates to a switching device, relates to the electric appliance field, including hollow shell, cavity separator, operating mechanism module and arc extinguish chamber module, the cavity separator is provided in the shell to divide the internal hollow area of shell into upper cavity and lower cavity, operating mechanism is provided in the upper cavity, the lower cavity is provided in the lower cavity, and the arc extinguish chamber module is provided in the lower cavity. The arc extinguish chamber module is arranged in the lower cavity. Compared with the prior art, the cavity isolation piece is arranged in the shell, and the arc extinguish chamber in the switching device is independently divided into a whole lower layer, so that high-temperature gas can be effectively prevented from escaping to a non-arc-extinguishing area in the circuit breaker, the capacity and the utilization rate of the arc extinguish chamber are improved, and better arc extinguish performance is exerted; and the short-circuit breaking capacity is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical appliances, in particular to a switch electrical appliance and a cavity isolating piece. Background Art

[0002] In the prior art, conventional molded case circuit breakers on the market generally adopt an overall layout design of a left-right structure, in which the operating mechanism is arranged along the front-to-back direction. This design results in a limited arc extinguishing capacity of the circuit breaker, which is difficult to meet the application requirements of high-voltage DC and AC systems. In order to solve the above problems, attempts have been made to design a circuit breaker using an upper and lower structural layout combined with a left-right assembly of a conductive arc extinguishing system. This new design significantly improves the arc extinguishing capacity, thereby enhancing the ability of the circuit breaker to interrupt short-circuit currents. However, this type of design uses an assembly method and also exposes technical defects such as poor synchronization, insufficient shell structural strength, relatively complex manufacturing process, and high cost, which leads to limited product life and short-circuit breaking capacity. Utility Model Content

[0003] The purpose of the present invention is to provide a switch electrical appliance and a cavity partition in order to overcome the defects of the above-mentioned prior art, and to use the cavity partition to realize an upper and lower partition layout structure, thereby effectively improving the utilization rate of the arc extinguishing chamber in the switch electrical appliance and effectively improving the arc extinguishing capacity.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A switching electrical appliance includes a hollow shell, a cavity isolator, an operating mechanism module and an arc extinguishing chamber module. The cavity isolator is arranged in the shell to separate the hollow area inside the shell into an upper cavity and a lower cavity. The operating mechanism is arranged in the upper cavity, and the arc extinguishing chamber module is arranged in the lower cavity.

[0006] Furthermore, the shell includes two shell components, and the shell components are directly connected to each other to form the shell.

[0007] Furthermore, the shell includes two shell components, and the two shell components are connected to the cavity isolation piece from upper and lower sides respectively, and part of the outer portion of the cavity isolation piece and the shell components together form a whole.

[0008] Furthermore, the shell assembly is composed of a plurality of sub-unit components.

[0009] Furthermore, the operating mechanism module includes a moving contact, a rotating shaft, an operating handle and a transmission assembly, the transmission assembly is sleeved on the rotating shaft, and the operating handle is connected to the moving contact through the transmission assembly; the cavity isolation piece is provided with a through slot, and a receiving portion is provided on the periphery of the through slot, the rotating shaft and the transmission assembly are connected to the receiving portion, and the moving contact passes downward through the through slot and can swing in the through slot.

[0010] Furthermore, an arc-starting piece is provided on the cavity isolation piece, and the arc-starting piece is located at the lower side of the cavity isolation piece, and one end of the arc-starting piece is close to and points to the through groove.

[0011] Furthermore, it also includes a tripping system, which is arranged in the upper cavity and connected to the cavity isolation piece.

[0012] Furthermore, the arc extinguishing chamber module includes a base and an arc extinguishing grid, the arc extinguishing grid is arranged in the base, a raised edge is provided on the upper side of the base, a sealing groove is provided on the cavity isolation piece, and the raised edge is embedded in the sealing groove upward.

[0013] Furthermore, a gas generating part is provided on the base, and an embedded groove is provided on one side of the gas generating part. The gas generating part is used to hang on and wrap the opening edge of the top of the base, and the raised edge is provided on the upper side of the gas generating part.

[0014] Furthermore, air outlets are provided on both sides of the arc extinguishing chamber module, and the positions of the lower cavity corresponding to the air outlets are provided with ion elimination parts.

[0015] A cavity isolating piece is provided in the shell of a switch electrical appliance, and divides the cavity in the shell into an upper cavity and a lower cavity. The lower cavity is used for separately arranging an arc extinguishing chamber module.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The utility model divides the arc extinguishing chamber in the switch electrical appliance into a whole lower layer by arranging a cavity partition in the shell, which can effectively reduce the escape of high-temperature gas to the non-arc extinguishing area inside the circuit breaker, improve the utilization rate of the arc extinguishing chamber, exert better arc extinguishing performance, and enhance the arc extinguishing capacity.

[0018] 2. The cavity isolator can be built into the shell, or it can be combined with the shell to form a part of the shell to improve its isolation and insulation performance.

[0019] 3. The cavity isolator can also serve as a receiving part of the operating mechanism module, thereby improving the overall structure, especially the strength and stability of the upper shell-related structure, and realizing reliable disconnection of large AC and DC short-circuit currents.

[0020] 4. An arc striker is directly arranged on the lower side of the cavity isolation piece to ensure that the generated arc is blown toward the arc extinguishing chamber module.

[0021] 5. A raised edge is provided on the arc extinguishing chamber module base or the gas generating part to cooperate with the sealing groove on the cavity isolation part to improve the electrical insulation sealing performance and the arc extinguishing capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structural explosion of the switch electrical appliance.

[0023] Figure 2 It is a cross-sectional diagram of a switch.

[0024] Figure 3 Schematic diagram of the structure of the cavity isolation component.

[0025] Figure 4 This is an exploded diagram of the operating mechanism module.

[0026] Figure 5 This is a schematic diagram of the installation of the arc extinguishing chamber module of a two-pole circuit breaker.

[0027] Figure 6 This is a schematic diagram of the installation of the arc extinguishing chamber module of the three-level circuit breaker.

[0028] Figure 7 It is a structural diagram of the arc extinguishing chamber module.

[0029] Figure 8 It is a schematic cross-sectional diagram of the installation of the arc extinguishing chamber module and the cavity isolation component.

[0030] Figure 9 Schematic diagram of the structure of the gas-generating parts.

[0031] Figure 10 Schematic diagram of the base bottom structure of the arc extinguishing chamber module.

[0032] Reference numerals:

[0033] 1-shell; 11-base; 12-cover; 121-upper cover; 122-middle cover; 13-freezing element; 1A-upper cavity; 1B-lower cavity;

[0034] 2- cavity isolation piece; 21- support foot; 22- through slot; 23- receiving portion; 231- bearing slot; 232- U-shaped slot; 24- arc starting piece; 25- conductive piece; 26- sealing slot;

[0035] 3-operating mechanism module; 31-moving contact; 32-rotating shaft; 33-operating handle; 34-transmission assembly; 35-shaft sleeve;

[0036] 4-arc extinguishing chamber module; 41-base; 411-first baffle; 412-second baffle; 413-air guide groove; 4A-first ventilation area; 4B-second ventilation area; 4C-third ventilation area; 4D-fourth ventilation area;

[0037] 42 - arc quenching grid; 43 - gas generating part; 431 - embedded groove; 432 - fixing groove; 44 - raised edge; 45 - gas outlet;

[0038] 5- Tripping system. DETAILED DESCRIPTION

[0039] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0040] like Figure 1 and Figure 2 As shown, this embodiment provides a switching electrical appliance, which can be a circuit breaker, a transfer switch, a relay, a contactor, etc. In this embodiment, a circuit breaker is used. The circuit breaker specifically includes two shell components, namely a base 11 and a cover 12. The base 11 and the cover 12 together constitute an internal hollow shell 1. The circuit breaker also includes a cavity partition 2, an operating mechanism module 3 and an arc extinguishing chamber module 4. The cavity partition 2 is arranged inside the shell 1, dividing the internal hollow area of ​​the shell 1 into an upper cavity 1A and a lower cavity 1B. The operating mechanism module 3 is arranged in the upper cavity 1A, and the arc extinguishing chamber module 4 is arranged in the lower cavity 1B. In this embodiment, due to the presence of the cavity partition 2, the upper cavity 1A and the lower cavity 1B are separated into two independent parts, and there is no channel or gap connecting them, thereby achieving complete mechanical isolation and enhancing the safety and reliability of the switching electrical appliance. This embodiment also improves assembly efficiency and reliability through a new structural layout, reduces production costs, and improves product cost performance and competitiveness.

[0041] In this embodiment, in order to facilitate assembly and maintenance, the cover body 12 can also be composed of two sub-units, namely, the upper cover 121 and the middle cover 122. During maintenance, only the upper cover 121 needs to be opened, which improves the use efficiency.

[0042] In other embodiments, the base 11 and the cover 12 may not be in direct contact with each other, and may be fixedly connected to the cavity isolation member 2 from the upper and lower sides respectively (not shown in the figure), so that the outer part of the cavity isolation member 2 also becomes part of the entire shell 1, that is, the base 11 and the cover 12 clamp the cavity isolation member 2 to form a whole. This structure can better isolate the upper cavity 1A and the lower cavity 1B, and improve the partition performance.

[0043] like Figure 3As shown, the cavity isolator 2 is an independent part and can be made of insulating plastic material. Support legs 21 are provided at the lower ends of both sides of the cavity isolator 2. The support legs 21 are used to cooperate with the corresponding supporting structure on the base 11 to fix the cavity isolator 2 to the middle layer inside the shell 1. A through groove 22 is provided in the middle part of the cavity isolator 2, and a receiving portion 23 is provided in the surrounding area of ​​the through groove 22. The receiving portion 23 is used to fix the operating mechanism module 3. Two arc-strike plates 24 are provided at both ends of the lower side of the cavity isolator 2. One end of the arc-strike plate 24 is close to and points to the through groove 22. Its function is to guide the arc smoothly to the arc extinguishing chamber below. Among them, the static contact is provided on an arc-strike plate 24. A pair of conductive members 25 are provided at each end of the upper side of the cavity isolator 2. The conductive members 25 are fixed to the cavity isolator 2 by screws. The conductive member 25 located on the right side of the figure is also connected to the tripping system 5. The tripping system 5 adopts a conventional structure available on the market and is therefore not expanded. The tripping system 5 is also fixed to the upper side of the cavity partition 2. Therefore, after the switch is assembled, the operating mechanism module 3, the conductive member 25, and the tripping system 5 are all located in the upper cavity 1A, while the arc-starting piece 24 is located in the lower cavity 1B, and the cavity partition 2 itself is used to achieve regional isolation.

[0044] like Figure 4 As shown, the operating mechanism module 3 includes a moving contact 31, a rotating shaft 32, an operating handle 33 and a transmission assembly 34. The transmission assembly 34 is sleeved on the rotating shaft 32, and the operating handle 33 is connected to the moving contact 31 through the transmission assembly 34. The rotating shaft 32 and the transmission assembly 34 are connected to the receiving portion 23, and the moving contact 31 extends downward through the through slot 22. When the operating handle 33 is pressed, the operating handle 33 drives the moving contact 31 to swing in the through slot 22 through the transmission assembly 34, so that it contacts or separates the static contact, thereby realizing the opening and closing action. Specifically, the receiving portion 23 of the cavity isolation member 2 has a bearing groove 231 and a U-shaped groove 232. The bearing groove 231 is used to fix the two ends of the rotating shaft 32, and the U-shaped groove 232 is used to fix the transmission assembly 34. In this embodiment, the transmission assembly 34 adopts a conventional commercially available structure to realize the linkage between the operating handle 33 and the moving contact 31, so it is not expanded in this embodiment. Axle sleeves 35 can also be provided at both ends of the rotating shaft 32, and the shaft sleeves 35 are snapped into the bearing grooves 231 to further strengthen the structure. The operating mechanism module 3 forms a seal at the through groove 22 by cooperating with the cavity isolator 2. Unlike the traditional structure in which the operating mechanism module 3 is suspended in the air or only fixed by the ribs inside the shell 1, the structure of this embodiment can not only play a role in regional partitioning, but also improve the installation strength; at the same time, it can realize the operation of assembling the operating mechanism module 3 and the cavity isolator 2 with each other first, and then installing them together into the shell 1, simplifying the installation structure and steps and improving reliability.

[0045] like Figure 5As shown, the arc extinguishing chamber module 4 is an integral module. One or more arc extinguishing chamber modules 4 are placed on the base 11. The number of arc extinguishing chamber modules 4 can be expanded in parallel. The number corresponds to the number of poles of the circuit breaker, generally one to four. Figure 5 For two-pole circuit breakers, Figure 6 For three-level circuit breaker. Figure 7 As shown, the arc extinguishing chamber module 4 includes a base 41, an arc extinguishing grid 42 and a gas-generating part 43. The arc extinguishing grid 42 is arranged in the base 41, and the cross-section of the arc extinguishing grid 42 is rectangular or trapezoidal. The base 41 is a structure with a top opening and a bottom opening, and the gas-generating part 43 is installed on both sides of the top opening. The top of the above-mentioned base 41 is also provided with a raised edge 44, and the lower side of the cavity isolation part 2 is provided with a sealing groove (not shown in the figure) that matches the raised edge 44, and the raised edge 44 is embedded upward in the sealing groove to achieve sealing. The function of this structure is to improve the electrical insulation sealing performance and enhance the arc extinguishing ability. In this embodiment, air outlets 45 are provided on both sides of the arc extinguishing chamber module 4, and the lower cavity 1B is provided with an eliminator 13 corresponding to the air outlet 45.

[0046] In another embodiment, Figure 8 As shown, as an optimized structural design, the raised edge 44 can be provided on the gas generating part 43, and the raised edge 44 and the sealing groove 26 on the lower side of the cavity isolation part 2 are engaged with each other to form a sealing structure. Figure 9 As shown, one side of the gas-producing part 43 is provided with an embedded groove 431 for hanging on the edge of the top opening of the base 41. At the same time, a fixing groove 432 is also provided on the side provided with the embedded groove 431. When fixing, first connect the embedded groove 431 of the gas-producing part 43 to the protrusion of the top opening of the base 41. At this time, the fixing groove 432 can be used together with the original slot on the base 41 to fix the arc extinguishing grid 42. The product part and the base 41 can also be fixed with screws. The function of the gas-producing part 43 is: when an arc is generated in the arc extinguishing chamber, the arc burns the gas-producing part 43, and the generated gas quickly increases the pressure of the arc extinguishing chamber, accelerating the arc to quickly enter the arc extinguishing chamber. At the same time, the generated gas can also cool the arc and accelerate the arc extinction.

[0047] like Figure 10As shown, a bar unit is provided at the bottom opening of the base 41, specifically a first bar 411 and a second bar 412 distributed in a cross shape. According to the coordinate axis of the base 41 in the figure, the first bar 411 is provided along the Y-axis direction of the arc extinguishing chamber base 41, separating the gas flow area behind the arc extinguishing chamber along the X-axis direction; the second bar 412 is provided left and right along the X-axis direction of the arc extinguishing chamber base 41, separating the gas flow area behind the arc extinguishing chamber along the Y-axis direction. Thus, the first bar 411 and the second bar 412 together divide the bottom opening of the base 41 into a field-shaped structure. They are the first ventilation area 4A, the second ventilation area 4B, the third ventilation area 4C and the fourth ventilation area 4D respectively. A guide unit is provided in each ventilation area. The guide unit can be a simple horizontal bar or a pipe with a through hole. In this embodiment, a horizontal bar structure is adopted in order to form a gas guide groove 413 in the ventilation area. The air guide grooves 413 of the first ventilation area 4A and the second ventilation area 4B are mirror-symmetrical, which can separate and guide the airflow. The air guide grooves 413 of the first ventilation area 4A and the third ventilation area 4C have the same inclination angle, and the air guide grooves 413 of the second ventilation area 4B and the fourth ventilation area 4D have the same inclination angle. In this embodiment, different ventilation areas are formed by providing a retaining bar unit at the bottom opening of the base 41, thereby separating the high-temperature gas generated after the arc is divided by the arc extinguishing grid 42. At the same time, air guide grooves 413 in different directions are provided in each ventilation area for guidance, so that the airflow field is uniform and stable, effectively avoiding the breakdown of the arc extinguishing chamber, and can be used together with the cavity isolation member 2 to significantly improve the arc extinguishing ability of the switch electrical appliance.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation to the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0053] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A switch electrical appliance, characterized in that: The invention comprises a hollow shell (1), a cavity isolating member (2), an operating mechanism module (3) and an arc extinguishing chamber module (4); the cavity isolating member (2) is arranged in the shell (1) to separate the hollow area inside the shell (1) into an upper cavity (1A) and a lower cavity (1B); the operating mechanism is arranged in the upper cavity (1A); and the arc extinguishing chamber module (4) is arranged in the lower cavity (1B).

2. A switching device according to claim 1, characterized in that: The housing (1) comprises two housing components, which are directly connected to each other to form the housing (1).

3. A switching device according to claim 1, characterized in that: The housing (1) comprises two shell components, the two shell components are connected to the cavity isolation piece (2) from upper and lower sides respectively, and a part of the exterior of the cavity isolation piece (2) and the shell components together form a whole.

4. A switching device according to claim 2 or 3, characterized in that: The shell assembly is composed of a plurality of subunit components.

5. The switch electrical device according to claim 1, characterized in that: The operating mechanism module (3) comprises a moving contact (31), a rotating shaft (32), an operating handle (33) and a transmission assembly (34); the transmission assembly (34) is sleeved on the rotating shaft (32); the operating handle (33) is connected to the moving contact (31) via the transmission assembly (34); the cavity isolating member (2) is provided with a through slot (22); a receiving portion (23) is provided on the periphery of the through slot (22); the rotating shaft (32) and the transmission assembly (34) are connected to the receiving portion (23); the moving contact (31) passes downward through the through slot (22) and can swing within the through slot (22).

6. A switching device according to claim 5, characterized in that: An arc-starting piece (24) is also provided on the cavity isolation piece (2). The arc-starting piece (24) is located on the lower side of the cavity isolation piece (2), and one end of the arc-starting piece is close to and points to the through groove (22).

7. The switch electrical device according to claim 5, characterized in that: It also includes a tripping system (5), which is arranged in the upper cavity (1A) and connected to the cavity isolation piece (2).

8. The switch electrical device according to claim 1, characterized in that: The arc extinguishing chamber module (4) comprises a base (41) and an arc extinguishing grid (42), the arc extinguishing grid (42) being arranged in the base (41), a raised edge (44) being arranged on the upper side of the base (41), a sealing groove (26) being arranged on the cavity isolation piece (2), and the raised edge (44) being embedded upwards into the sealing groove (26).

9. The switch electrical device according to claim 8, characterized in that: A gas-generating part (43) is provided on the base (41), and an embedded groove (431) is provided on one side of the gas-generating part (43). The gas-generating part (43) is used to hang on and wrap the opening edge of the top of the base (41), and the raised edge (44) is provided on the upper side of the gas-generating part (43).

10. The switch electrical device according to claim 1, characterized in that: Gas outlets (45) are provided on both sides of the arc extinguishing chamber module (4), and a detaching member (13) is provided at a position of the lower cavity (1B) corresponding to the gas outlets (45).

11. A cavity isolation member (2), characterized in that: It is arranged in a housing (1) of a switching electrical appliance, and divides the cavity in the housing (1) into an upper cavity (1A) and a lower cavity (1B); the lower cavity (1B) is used to separately arrange an arc extinguishing chamber module (4).

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