Low-voltage vacuum circuit breaker

Abstract

This utility model relates to a low-voltage vacuum circuit breaker, comprising a low-voltage vacuum interrupter and a medium-voltage mechanism assembly. The low-voltage vacuum interrupter is fixedly mounted on the housing of the medium-voltage mechanism assembly. The output shaft of the medium-voltage mechanism assembly is connected to the three-phase load operating rods of the low-voltage vacuum interrupter via a three-linkage mechanism to control the opening and closing operations of the low-voltage vacuum interrupter. Using the medium-voltage mechanism assembly, adapted to the low-voltage vacuum interrupter, allows the designed low-voltage vacuum circuit breaker to be better suited for the new energy and power transmission and distribution fields. Compared to using a low-voltage ACB operating mechanism, based on the standard medium-voltage mechanism assembly, only the transmission mechanism design needs to be optimized to control the opening distance of the low-voltage vacuum interrupter and meet its mechanical characteristic requirements.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker switches, specifically to a low-voltage vacuum circuit breaker. Background Technology

[0002] With the rapid development of the new energy sector, the market has placed higher demands on supporting low-voltage switches. For example, there is a demand for low-voltage circuit breakers (switches) with a voltage of 3.6kV and an operating capacity of 5000A-63kA. These switches have relatively low voltage levels, but require a high-power operating mechanism, which conventional low-voltage mechanisms are currently not suitable for.

[0003] Conventional low-voltage circuit breakers (ACBs) employ an air-grid arc-extinguishing method with a compact operating mechanism. This meets basic electrical life requirements (breaking rated current) but cannot provide short-circuit trip protection (breaking short-circuit current). However, in the new energy sector, low-voltage circuit breakers require not only breaking rated current but also short-circuit current. Currently, the best arc-extinguishing method is a vacuum interrupter. The arc-extinguishing principles of air-grid and vacuum interrupters differ, leading to different requirements for the output characteristic curves of the corresponding operating mechanisms. Conventional low-voltage vacuum interrupters are typically paired with low-voltage ACB operating mechanisms. However, applying low-voltage vacuum interrupters to new energy sectors necessitates adjustments to the overall switch design to achieve compatibility with the low-voltage ACB operating mechanism. Such adjustments are costly and complex. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a low-voltage vacuum circuit breaker, which solves the technical problem that the current low-voltage vacuum circuit breaker used in the new energy field adopts the previous low-voltage ACB operating mechanism, resulting in high overall cost and difficulty of the switch.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A low-voltage vacuum circuit breaker is provided, comprising:

[0007] A low-pressure vacuum interrupter and a medium-pressure mechanism assembly, wherein the low-pressure vacuum interrupter is fixedly mounted on the housing of the medium-pressure mechanism assembly;

[0008] The output shaft of the medium-pressure mechanism assembly is connected to the three-phase load operating lever of the low-pressure vacuum interrupter via a three-linkage mechanism to realize the closing and opening operations of the low-pressure vacuum interrupter.

[0009] Furthermore, all of the linkage mechanisms include

[0010] The large crank arm is located below the low-pressure vacuum interrupter, and its front end is hinged to a support block, which is fixed to the base plate.

[0011] The straight crank arm has its lower end hinged to the rear end of the large crank arm and its upper end hinged to the small crank arm.

[0012] A small crank arm is mounted on the output shaft and rotates synchronously with the output shaft;

[0013] The large crank arm is connected to the load operating lever at the middle. The large crank arm swings up and down around the support block, thereby synchronously driving the three-phase load operating lever to move up and down.

[0014] Furthermore, the housing is provided with three limiting holes, through which the large crank arm passes to limit the horizontal swing of the large crank arm.

[0015] Furthermore, the housing is L-shaped with an assembly opening at its rear, and the low-pressure vacuum interrupter is fixed inside the assembly opening.

[0016] Furthermore, multiple bolt holes are respectively opened on the left and right sides of the bottom plate of the housing, and the connecting bolts pass through the bolt holes of the bottom plate to fix the housing.

[0017] Furthermore, the opening distance of the load operating lever driven by the large crank arm is 5-8mm.

[0018] The beneficial effects of this utility model are:

[0019] This utility model discloses a low-voltage vacuum circuit breaker that uses a medium-voltage operating mechanism to match a low-voltage vacuum interrupter. The medium-voltage operating mechanism was designed from the outset to be compatible with the vacuum interrupter. By using a medium-voltage mechanism assembly adapted to the low-voltage vacuum interrupter, the designed low-voltage vacuum circuit breaker can be better suited for the new energy and power transmission and distribution sectors. Compared to using a low-voltage ACB operating mechanism, based on a standard medium-voltage mechanism assembly, only the transmission mechanism design needs to be optimized, and the opening distance of the low-voltage vacuum interrupter needs to be controlled to meet its mechanical characteristic requirements.

[0020] The output shaft of the medium-pressure mechanism assembly and the load operating lever of the low-pressure vacuum interrupter adopt a newly designed linkage mechanism. This linkage mechanism is a force-saving lever structure. Without changing the operating power of the mechanism, it can meet the normal operation of the switch, while making the opening distance smaller, the contact pressure larger, and the corresponding speed higher.

[0021] The entire low-voltage vacuum circuit breaker is installed through bolt holes on both sides of the base plate, which facilitates its better adaptation to the fields of new energy and power transmission and distribution. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a perspective view of the low-voltage vacuum circuit breaker of this utility model;

[0024] Figure 2 This is a side view of the low-voltage vacuum circuit breaker of this utility model;

[0025] Figure 3 This is a schematic diagram of a linkage mechanism;

[0026] Figure 4 This is a schematic diagram of the output shaft, the three-link mechanism, and the base plate;

[0027] Among them, 1. Low-pressure vacuum interrupter, 2. Medium-pressure mechanism assembly, 21. Output shaft;

[0028] 3. Base plate, 31. Bolt holes;

[0029] 4. Linkage mechanism; 41. Large crank arm; 42. Straight crank arm; 43. Small crank arm; 44. Support block;

[0030] 5. Limit plate. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] This application provides a low-voltage vacuum circuit breaker, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0033] To address the technical problems of high overall cost and complexity caused by the use of conventional low-voltage ACB operating mechanisms in existing low-voltage vacuum circuit breakers used in the new energy field, an embodiment of this application provides a low-voltage vacuum circuit breaker. This is described in detail below.

[0034] like Figures 1 to 4 As shown, a low-voltage vacuum circuit breaker includes...

[0035] The low-pressure vacuum interrupter 1 and the medium-pressure mechanism assembly 2 are provided, wherein the low-pressure vacuum interrupter 1 is fixedly mounted on the housing of the medium-pressure mechanism assembly 2.

[0036] The output shaft 21 of the medium-pressure mechanism assembly 2 is connected to the three-phase load operating rod of the low-pressure vacuum interrupter 1 via the three-linkage mechanism 4, so as to realize the closing and opening operations of the low-pressure vacuum interrupter 1.

[0037] In this embodiment, the medium-pressure mechanism assembly 2 is the standard medium-pressure mechanism assembly 2. This embodiment does not adjust the principle and structure of the medium-pressure mechanism assembly 2 itself, but only improves the linkage mechanism 4 between the output end of the medium-pressure mechanism assembly 2 and the low-pressure vacuum interrupter 1.

[0038] The overall design, transmission, and installation of the medium-voltage mechanism assembly 2 can meet the installation, characteristics, and usage requirements of the low-voltage vacuum interrupter 1 both domestically and internationally; its external dimensions and functions are suitable for the fields of new energy and power transmission and distribution.

[0039] Conventionally, medium-voltage operating mechanisms are designed from the outset to match vacuum interrupters. The medium-voltage mechanism assembly 2 is paired with the medium-voltage vacuum interrupter. However, in the low-voltage vacuum circuit breaker of this patent application, the low-voltage vacuum interrupter 1 and the medium-voltage mechanism assembly 2 are used together, optimizing the transmission mechanism to meet the mechanical characteristic requirements of the low-voltage vacuum interrupter 1.

[0040] The electrical and mechanical parameters of the low-pressure vacuum interrupter 1 differ significantly from those of the medium-pressure vacuum interrupter, such as the opening distance, contact pressure, and closing / opening speed. Therefore, it is necessary to adjust the linkage mechanism 4 between the output shaft 21 and the load operating lever to accommodate the electrical parameters and mechanical characteristics of the poles within the low-pressure vacuum interrupter 1. In particular, the low-pressure vacuum interrupter 1 has a smaller opening distance than the medium-pressure vacuum interrupter, but requires a larger closing operation power; the redesigned linkage mechanism 4 can meet its parameter requirements.

[0041] Specifically, as an optional implementation method in this embodiment, such as Figures 2 to 4 As shown, each of the linkage mechanisms 4 includes

[0042] The large crank arm 41 is located below the low-pressure vacuum interrupter 1, and its front end is hinged to the support block 44, which is fixed on the base plate 3.

[0043] The straight crank arm 42 is hinged at its lower end to the rear end of the large crank arm 41 and at its upper end to the small crank arm 43.

[0044] Small crank arm 43 is mounted on the output shaft 21 and rotates synchronously with the output shaft 21;

[0045] The large crank arm 41 is connected to the load operating lever at the middle. The large crank arm 41 swings up and down around the support block 44, thereby synchronously driving the three-phase load operating lever to perform up and down opening and closing actions.

[0046] In this embodiment, the small crank arm 43 and the output shaft 21 are connected by a spline.

[0047] In this embodiment, the hinge connection is a pin connection.

[0048] During operation, the opening and closing motion of the medium-pressure mechanism assembly 2 is ultimately converted into the forward and reverse rotation of the output shaft 21. When the output shaft 21 rotates clockwise, the small crank arm 43 drives the large crank arm 41 to rotate clockwise through the straight crank arm 42. At this time, the large crank arm 41 drives the load operating lever to move downward, and each phase of the low-pressure vacuum interrupter 1 is opened. When the output shaft 21 rotates counterclockwise, it drives each phase of the low-pressure vacuum interrupter 1 to close.

[0049] In this embodiment, the linkage mechanism 4 enables the large crank arm 41 to drive the load operating lever with an opening distance of 5-8 mm. The opening distance is preferably 7 mm.

[0050] Specifically, as an optional implementation method in this embodiment, such as Figure 4 As shown, the housing is provided with three limiting holes, and the large crank arm 41 passes through the limiting holes to limit the horizontal swing of the large crank arm 41.

[0051] In this embodiment, each limiting hole consists of two limiting plates 5, one on the left and one on the right.

[0052] Specifically, as an optional implementation method in this embodiment, such as Figure 1 and Figure 2 As shown, the housing has an overall L-shaped structure with an assembly port at its rear, and the low-pressure vacuum interrupter 1 is fixed in the assembly port.

[0053] The low-voltage vacuum interrupter 1 and the medium-voltage mechanism assembly 2 are assembled together to form a low-voltage vacuum circuit breaker with a rectangular structure, which is convenient for positioning and installation.

[0054] Specifically, as an optional implementation method in this embodiment, such as Figure 4 As shown, multiple bolt holes 31 are opened on the left and right sides of the bottom plate 3 of the housing, and the connecting bolts pass through the bolt holes 31 of the bottom plate 3 to fix the housing.

[0055] The entire low-voltage vacuum circuit breaker is installed through bolt holes 31 on both the left and right sides, which facilitates positioning and installation in the fields of new energy and power transmission and distribution.

[0056] The medium-pressure mechanism assembly 2 is located on the base plate 3, and the low-pressure vacuum interrupter 1 is installed on the medium-pressure mechanism assembly 2.

[0057] The low-voltage vacuum circuit breaker of this utility model adopts a medium-voltage operating mechanism in conjunction with the low-voltage vacuum interrupter 1, which makes the designed low-voltage vacuum circuit breaker better adaptable to the fields of new energy and power transmission and distribution. Compared with the low-voltage ACB operating mechanism, based on the standard medium-voltage mechanism assembly 2, it is only necessary to optimize the transmission mechanism design and control the opening distance of the low-voltage vacuum interrupter 1 to meet the mechanical characteristic requirements of the low-voltage vacuum interrupter 1.

[0058] Secondly, a newly designed linkage mechanism 4 is adopted between the output shaft 21 of the medium-pressure mechanism assembly 2 and the load operating lever of the low-pressure vacuum interrupter 1. This linkage mechanism 4 is a force-saving lever structure. Without changing the operating power of the mechanism, it can meet the normal operation of the switch, while making the opening distance smaller, the contact pressure larger, and the corresponding speed higher.

[0059] All the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0060] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0061] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0063] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0064] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0065] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low voltage vacuum circuit breaker, characterized in that, include The low-pressure vacuum interrupter (1) and the medium-pressure mechanism assembly (2) are fixedly mounted on the housing of the medium-pressure mechanism assembly (2). The output shaft (21) of the medium-pressure mechanism assembly (2) is connected to the three-phase load operating rod of the low-pressure vacuum interrupter (1) via a three-linkage mechanism (4) to realize the closing and opening operations of the low-pressure vacuum interrupter (1).

2. The low-voltage vacuum circuit breaker according to claim 1, characterized in that, The linkage mechanism (4) includes The large crank arm (41) is located below the low-pressure vacuum interrupter (1), and its front end is hinged to a support block (44), which is fixed on the base plate (3). The straight crank arm (42) is hinged at its lower end to the rear end of the large crank arm (41) and at its upper end to the small crank arm (43). Small crank arm (43), which is mounted on the output shaft (21) and rotates synchronously with the output shaft (21); The middle part of the large crank arm (41) is connected to the load operating rod. The large crank arm (41) swings up and down around the support block (44), thereby synchronously driving the three-phase load operating rod to perform up and down opening and closing actions.

3. The low-voltage vacuum circuit breaker according to claim 2, characterized in that, The housing is provided with three limiting holes, through which the large crank arm (41) passes to limit the horizontal swing of the large crank arm (41).

4. The low-voltage vacuum circuit breaker according to claim 1, characterized in that, The housing is L-shaped with an assembly port at its rear, and the low-pressure vacuum interrupter (1) is fixed in the assembly port.

5. The low-voltage vacuum circuit breaker according to claim 1, characterized in that, Multiple bolt holes (31) are opened on the left and right sides of the bottom plate (3) of the housing. The connecting bolts pass through the bolt holes (31) of the bottom plate (3) to fix the housing.

6. The low-voltage vacuum circuit breaker according to claim 2, characterized in that, The large crank arm (41) drives the load operating lever to open at a distance of 5-8 mm.

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