Large-current isolating switch

Abstract

The utility model provides a large-current isolating switch, which comprises an insulating switch fixing frame. A static contact is mounted at the upper end of the insulating switch fixing frame; a lower conducting rod is mounted at the lower end of the insulating switch fixing frame; an operation output assembly is installed in the middle of the insulation switch fixing frame. One end of the lower conducting rod is rotatably provided with a movable contact assembly through a central shaft; the operation output assembly drives the moving contact assembly to move back and forth through an insulating pull rod, and drives the moving contact assembly and the static contact to be connected and disconnected, thereby achieving the switching-on and switching-off of the disconnecting switch. Manual operation is not needed, the overall potential safety hazard is reduced, the personal safety of workers is guaranteed, the structure is reliable and durable, action is flexible and accurate, and standardized production can be achieved during machining and manufacturing.

Description

Technical Field

[0001] The utility model relates to the technical field of disconnect switches, and in particular to a high-current disconnect switch. Background Art

[0002] A disconnect switch is a common switching device in a power transmission system and is widely used in substations and power plants. Its working principle and structure are relatively simple. However, due to its large usage and high requirements for working reliability, it has a great impact on the design, construction, and safe operation of substations and power plants. The main feature of a knife switch is its lack of arc extinguishing ability, and it can only connect and disconnect the circuit without load current. A disconnect switch is used for various voltages and is used to change the circuit connection or isolate the line or equipment from the power source. It has no current-breaking ability and can only be operated after the line is disconnected by other equipment. The main function of a disconnect switch is to establish a reliable insulation gap after opening, separating the equipment or line to be repaired from the power source with an obvious disconnection point to ensure the safety of maintenance personnel and equipment. Disconnect switches can generally be divided into outdoor and indoor types; they can be divided into single-pole and three-pole according to the number of poles; they can be divided into those with and without earthing switches according to whether there is an earthing switch; they can be divided into general-purpose, quick-opening, and transformer neutral-point types according to their uses. The structure of traditional disconnect switches is not very stable, reliable, and durable, and their actions are not flexible and accurate enough, and they are not suitable for high currents. Therefore, it is necessary to provide a high-current disconnect switch to solve the above technical problems. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a high-current disconnect switch that does not require manual operation, reduces the overall safety hazard, ensures the personal safety of staff, and has a reliable, durable, flexible, and accurate structure, and can be standardized in processing and manufacturing.

[0004] To achieve the above purpose, the utility model is realized through the following technical solutions: A high-current disconnect switch includes an insulating switch fixing frame; wherein: a static contact is installed at the upper end of the insulating switch fixing frame; a lower conducting rod is installed at the lower end of the insulating switch fixing frame; an operation output assembly is installed in the middle of the insulating switch fixing frame; one end of the lower conducting rod is rotatably installed with a moving contact assembly through a central axis; the operation output assembly drives the moving contact assembly to move back and forth through an insulating pull rod, driving the moving contact assembly to engage and separate from the static contact, thereby realizing the closing and opening of the disconnect switch.

[0005] Further as an improvement of the technical solution of the present utility model, the operation output assembly includes a switch fixing plate, a driving shaft, a driving bevel gear, a driven shaft, a driven bevel gear and a crank arm; the switch fixing plate is installed on the insulating switch fixing frame; the driving shaft is rotatably installed on the switch fixing plate through a bearing; the driving bevel gear is installed at one end of the driving shaft; the other end of the driving shaft is connected to a driving mechanism; the driven shaft is rotatably installed on the switch fixing plate through a bearing; the driven bevel gear is installed at one end of the driven shaft; the driven bevel gear meshes with the driving bevel gear at a 90° angle; one end of the crank arm is connected to the driven shaft, and the other end is hinged to the insulating pull rod through a first pin shaft.

[0006] Further as an improvement of the technical solution of the present utility model, the moving contact assembly includes a moving crank block and a moving contact rod; one end of the moving crank block is hinged to the lower conducting rod through the central shaft, and the other end is hinged to the insulating pull rod through a second pin shaft; the moving contact rod is fixedly installed on the moving crank block.

[0007] Further as an improvement of the technical solution of the present utility model, the insulating switch fixing frame is integrally triangular.

[0008] Further as an improvement of the technical solution of the present utility model, the moving crank block, the moving contact rod and the static contact are all conductors.

[0009] Advantages of the present utility model:

[0010] The operation output assembly of the present utility model is used to output a rotational motion, and the rotating shaft of the three-position disconnecting switch is perpendicular (90°) to the operation output assembly. By setting the operation output assembly, the present utility model operates in an electric drive mode without manual operation. The operation output assembly drives the moving contact assembly to move back and forth through the insulating pull rod, driving the engaging and separating actions between the moving contact assembly and the static contact, thereby realizing the closing and opening functions of the disconnecting switch, reducing the overall safety hazard, ensuring the personal safety of the staff, improving the effect of electric operation, enabling the staff to remotely control, and having strong practicability. The structure of the present utility model is reliable, durable, flexible and accurate in action, and can be standardized in processing and manufacturing. Description of the Drawings

[0011] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives and advantages of the present utility model will become more obvious:

[0012] Figure 1 It is a schematic diagram of the overall structure of a large-current disconnecting switch according to an embodiment of the present utility model.

[0013] In the accompanying drawings: 1 - insulating switch fixing bracket; 2 - static contact; 3 - lower conducting rod; 4 - operation output assembly; 5 - central shaft; 6 - moving contact assembly; 7 - insulating pull rod; 41 - switch fixing plate; 42 - driving shaft; 43 - driving bevel gear; 44 - driven shaft; 45 - driven bevel gear; 46 - crank arm; 47 - first pin shaft; 61 - moving crank block; 62 - moving contact rod; 63 - second pin shaft. Specific embodiments

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not limit the present invention.

[0015] It should be noted that all directional indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0016] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0017] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] As Figure 1As shown, a large-current disconnecting switch includes an insulating switch fixing bracket 1. Among them: a static contact 2 is installed at the upper end of the insulating switch fixing bracket 1; a lower conductive rod 3 is installed at the lower end of the insulating switch fixing bracket 1; the lower conductive rod 3 is connected to a power source; an operation output assembly 4 is installed in the middle of the insulating switch fixing bracket 1; one end of the lower conductive rod 3 is rotatably installed with a moving contact assembly 6 through a central shaft 5; the operation output assembly 4 drives the moving contact assembly 6 to move back and forth through an insulating pull rod 7, driving the moving contact assembly 6 to engage and separate from the static contact 2, thereby realizing the closing and opening of the disconnecting switch. It should be noted that the operation output assembly 4 of the present invention is used to output a rotational motion, and the rotating shaft of the three-position disconnecting switch is perpendicular (90°) to the operation output assembly 4. By setting the operation output assembly 4, the present invention is operated in an electric drive mode without manual operation. The operation output assembly 4 drives the moving contact assembly 6 to move back and forth through the insulating pull rod 7, driving the moving contact assembly 6 to engage and separate from the static contact 2, thereby realizing the functions of closing and opening the disconnecting switch, reducing the overall safety hazard, ensuring the personal safety of the staff, and improving the effect of electric operation. The staff can remotely control it, and it has strong practicability. The structure of the present invention is reliable, durable, flexible, accurate in action, and can be produced in a standardized manner during processing and manufacturing.

[0020] Specifically, in the solution of this embodiment, the operation output assembly 4 includes a switch fixing plate 41, a driving shaft 42, a driving bevel gear 43, a driven shaft 44, a driven bevel gear 45, and a crank arm 46; the switch fixing plate 41 is installed on the insulating switch fixing bracket 1; the driving shaft 42 is rotatably installed on the switch fixing plate 41 through a bearing; the driving bevel gear 43 is installed at one end of the driving shaft 42; the other end of the driving shaft 42 is connected to a driving mechanism; the driven shaft 44 is rotatably installed on the switch fixing plate 41 through a bearing; the driven bevel gear 45 is installed at one end of the driven shaft 44; the driven bevel gear 45 meshes with the driving bevel gear 43 at a 90° angle; one end of the crank arm 46 is connected to the driven shaft 44, and the other end is hinged to the insulating pull rod 7 through a first pin shaft 47.

[0021] Specifically, in the solution of this embodiment, the moving contact assembly 6 includes a moving crank block 61 and a moving contact rod 62; one end of the moving crank block 61 is hinged to the lower conductive rod 3 through the central shaft 5, and the other end is hinged to the insulating pull rod 7 through a second pin shaft 63; the moving contact rod 62 is fixedly installed on the moving crank block 61.

[0022] It should be noted that when the utility model works, the driving mechanism that provides power drives the driving shaft 42 to rotate. After the driving shaft 42 rotates, it drives the driving bevel gear 43 on the shaft to rotate, and the driven bevel gear 45 also rotates accordingly. The functions of the driving bevel gear 43 and the driven bevel gear 45 are to rotate the transmission angle by 90°, so as to achieve the purpose of making the mechanism and the disconnector perpendicular to each other. The rotation of the driven bevel gear 45 drives the crank arm 46 fixed on the driven shaft 44 to rotate, and the rotation of the crank arm 46 drives the insulating pull rod 7 to move back and forth (reciprocating motion). The moving toggle block 61 and the moving contact rod 62 are integrally connected and rotate back and forth through the central small shaft on the lower conductive rod 3. The insulating pull rod 7 is connected to the moving toggle block 61. The forward and backward movement of the insulating pull rod 7 drives the moving contact rod 62 fixed on the moving toggle block 61 to move back and forth, thereby driving the engaging and separating actions between the moving contact rod 62 and the static contact 2, so as to achieve the functions of closing and opening the disconnector.

[0023] It should be noted that the length design of each connecting rod of the four-bar linkage mechanism composed of the crank arm 46, the insulating pull rod 7, the moving toggle block 61 and the moving contact rod 62 is closely related to the technical parameters required by the disconnector, making their design the key to the overall structure design. In combination with the characteristics of the isolating operating mechanism, the ratio of the driving bevel gear and the driven bevel gear and the lengths of the connecting rods of the four-bar linkage mechanism are designed and adjusted, so as to make the disconnector meet the required technical parameters.

[0024] Specifically, in the solution of this embodiment, the insulating switch fixing frame 1 is integrally triangular. It should be noted that the insulating switch fixing frame 1, the switch fixing plate 41 and other switch components form a whole for the high-current disconnector. The triangular insulating switch fixing frame 1 can prevent interference between various components and ensure the normal operation of each component.

[0025] Specifically, in the solution of this embodiment, the moving toggle block 61, the moving contact rod 62 and the static contact 2 are all conductors. The rotation of the crank arm 46 drives the insulating pull rod 7 to move back and forth (reciprocating motion). The moving toggle block 61 and the moving contact rod 62 are integrally connected and rotate back and forth through the central small shaft on the lower conductive rod 3. The insulating pull rod 7 is connected to the moving toggle block 61. The forward and backward movement of the insulating pull rod 7 drives the moving contact rod 62 fixed on the moving toggle block 61 to move back and forth, thereby driving the engaging and separating actions between the moving contact rod 62 and the static contact 2, so as to achieve the functions of closing and opening the disconnector.

[0026] The above has introduced in detail the technical solutions provided by the embodiments of the present utility model. Specific examples are used herein to elaborate on the principles and implementation manners of the embodiments of the present utility model. The description of the above embodiments is only applicable to helping understand the principles of the embodiments of the present utility model; at the same time, for those of ordinary skill in the art, according to the embodiments of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A large-current disconnecting switch, comprising an insulating switch fixing bracket; characterized in that: A static contact is installed at the upper end of the insulating switch fixing frame; a lower conductive rod is installed at the lower end of the insulating switch fixing frame; an operation output assembly is installed in the middle of the insulating switch fixing frame; a moving contact assembly is rotatably installed at one end of the lower conductive rod through a central axis; the operation output assembly drives the moving contact assembly to move back and forth through an insulating pull rod, driving the moving contact assembly to engage and separate with the static contact, thereby realizing the closing and opening of the isolating switch.

2. The large-current disconnecting switch according to claim 1, characterized in that: The operation output assembly includes a switch fixing plate, a driving shaft, a driving bevel gear, a driven shaft, a driven bevel gear and a crank arm; the switch fixing plate is mounted on the insulating switch fixing frame; the driving shaft is rotatably mounted on the switch fixing plate through a bearing; the driving bevel gear is mounted on one end of the driving shaft; the other end of the driving shaft is connected to a driving mechanism; the driven shaft is rotatably mounted on the switch fixing plate through a bearing; the driven bevel gear is mounted on one end of the driven shaft; the driven bevel gear is meshed with the driving bevel gear at 90 degrees; one end of the crank arm is connected to the driven shaft, and the other end is hinged to the insulating pull rod through a first pin shaft.

3. A large current disconnecting switch according to claim 1, characterized in that: The movable contact assembly includes a movable corner block and a movable contact rod; one end of the movable corner block is hinged to the lower conductive rod through the central axis, and the other end is hinged to the insulating pull rod through a second pin shaft; the movable contact rod is fixedly mounted on the movable corner block.

4. A large current disconnecting switch according to claim 1, characterized in that: The insulating switch fixing frame is in a triangular shape as a whole.

5. A large current disconnecting switch according to claim 3, characterized in that: The movable knee block, the movable contact rod and the static contact are all conductors.

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