switching device

Abstract

Embodiments of the present disclosure relate to a switch device. The switch device (100) comprises: a plurality of moving contacts (40); a power arm (10) adapted to receive power to rotate about a first axis (P1); and a transmission assembly (30) mounted to the power arm (10) eccentrically relative to the first axis (P1), the transmission assembly (30) being configured to rotate with the power arm (10) to cause the plurality of moving contacts (40) to rotate synchronously to switch an operating state of the switch device (100). According to the switch device of the embodiments of the present disclosure, the moving contacts can be supported and driven in a simple structure, and miniaturization of the switch device can be achieved while ensuring sufficient support strength.

Description

Technical Field

[0001] The embodiments of this disclosure relate primarily to power systems, and more particularly to switching devices for power systems. Background Technology

[0002] Switching devices such as disconnect switches and grounding switches are widely used in power systems for the switching control of power lines. Switching devices typically include various conductive components for interconnecting circuits, such as moving contacts, stationary contacts, and metal parts to enhance the structural strength of the components. These components require sufficient insulation clearance.

[0003] When switching devices are used in high-voltage (e.g., voltages up to tens of thousands of volts) power grid scenarios, the design of the insulation gaps between the metal components within the switching device is of paramount importance.

[0004] For such high-voltage switchgear, in order to achieve miniaturization, a conventional switchgear design involves creating a sealed volume inside the switchgear and filling that volume with a special insulating gas (such as SF6) with excellent insulating properties. Due to the superior insulating properties of this special insulating gas, insulation performance can be ensured even if the insulation gaps between conductive components within the switchgear are not particularly large (thus the device occupies a small space). However, special insulating gases (such as SF6) are not environmentally friendly and have a significant impact on the atmospheric greenhouse effect.

[0005] Another traditional switching device is the air-insulated switch, which uses air to insulate the conductive components within the switch. Given the limitations of air insulation, this type of switch is exceptionally large and bulky, resulting in high manufacturing costs and a significant space requirement. Therefore, improvements to traditional switching devices are desired. Summary of the Invention

[0006] According to an example embodiment of this disclosure, a switching device is proposed that solves or at least partially solves one or more of the above-described problems.

[0007] In a first aspect of this disclosure, a switching device is provided. The switching device includes: a plurality of moving contacts; a power arm adapted to receive power for rotation about a first axis; and a transmission assembly eccentrically mounted to the power arm relative to the first axis, the transmission assembly being configured to rotate together with the power arm such that the plurality of moving contacts rotate synchronously to switch the operating state of the switching device; wherein the switching device may further include a base, each of the moving contacts being pivotally mounted to the base, and the center of rotation of each of the moving contacts being on the first axis.

[0008] According to the switchgear device of this disclosure, a transmission assembly eccentrically mounted to the power arm relative to a first axis can support and drive the moving contact with a simple structure, achieving miniaturization of the switchgear while ensuring sufficient support strength. This arrangement minimizes the space occupied by the moving contact during movement.

[0009] In some embodiments, the transmission assembly may include: a drive shaft having a second axis parallel to the first axis and eccentrically mounted to the power arm; and a plurality of drive arms corresponding to the plurality of moving contacts, arranged sequentially along the second axis, each drive arm having one end attached to the drive shaft and the other end attached to the moving contact, such that the moving contact is actuated by the drive arm to rotate about the first axis. Thus, actuation of the moving contact can be achieved using only the drive shaft and drive arms, significantly simplifying the structure of the transmission assembly.

[0010] In some embodiments, when viewed along the first axis, the transmission arm, the power arm, and the moving contact may form a triangular structure, such that each of the moving contacts provides structural support via the triangular structure during rotation of the plurality of moving contacts around the first axis. The triangular structure utilizes the inherent stability of the triangle to achieve robust and reliable support for the moving contacts.

[0011] In some embodiments, when viewed along the first axis, the eccentricity of the drive shaft to the first axis, the line segment from the second axis to the attachment point of the drive arm and the moving contact, and the line segment from the attachment point to the first axis can respectively form the three sides of the triangle structure. During the rotation of the moving contact, the side lengths of the three sides of the triangle structure remain constant. Thus, the triangular structure for supporting the moving contact can be conveniently implemented by means of the eccentric arrangement of the transmission assembly.

[0012] In some embodiments, the drive arm includes: a mounting section extending along the second axis and including a mounting hole adapted to receive the drive shaft, the mounting hole being form-fitted to the drive shaft; and a transmission section extending from the mounting section and attached to the moving contact. This facilitates the mounting of the drive arm and the transmission of force to the drive shaft.

[0013] In some embodiments, the transmission arm is a one-piece molded insulating part. This allows for convenient manufacturing of the transmission arm and ensures its insulating properties.

[0014] In some embodiments, the mounting section may include a stripping section and a connecting section. The stripping section includes a stripping angle suitable for the drive arm to be demolded from the mold, and the connecting section does not have the stripping angle to facilitate the shape fit between the drive arm and the drive shaft. Thus, the drive arm can be conveniently injection molded by setting the stripping angle, and force transmission between the drive arm and the drive shaft can be achieved without setting the stripping angle.

[0015] In some embodiments, the transmission section can be attached to the moving contact via a shaft hole connection.

[0016] In some embodiments, the moving contact may include the adjustment hole, the size of which is configured to allow the attachment point between the drive arm and the moving contact to adapt. This allows for assembly of the moving contact and drive arm with larger tolerances, reducing the precision requirements for manufacturing and thus lowering manufacturing costs. Simultaneously, synchronous control between multiple moving contacts can be achieved with a simple structure.

[0017] In some embodiments, the transmission assembly may further include at least one spacer sleeve configured between two adjacent transmission arms. By providing the spacer sleeve, the size of the molds required to manufacture the transmission arms can be significantly reduced, thereby enabling the transmission assembly to be manufactured at a low cost.

[0018] In some embodiments, the drive shaft is a shaft with a polygonal profile and is an integrally molded insulating injection molded part.

[0019] In some embodiments, the power arm may include: a power coupling portion adapted to couple with the input shaft of a power source to rotate together with the input shaft about the first axis; and an eccentric actuation portion arranged eccentrically relative to the power coupling portion and including a hole adapted to receive the drive shaft.

[0020] In some embodiments, the power coupling may include a metal coupling on the side away from the transmission assembly, the metal coupling being integrally formed with the power arm via clamp injection molding, the power arm being made of insulating material except for the metal coupling.

[0021] In some embodiments, the switching device may further include a plurality of stationary contacts fixedly disposed in the rotation path of the moving contact. The moving contact is configured to move between a first predetermined rotation position and a second predetermined rotation position. At the first predetermined rotation position, the moving contact engages with a corresponding stationary contact to close the switching device. At the second predetermined rotation position, the moving contact separates from the corresponding stationary contact to open the switching device.

[0022] In some embodiments, the switching device may further include a plurality of grounding contacts fixedly disposed in the rotation path of the moving contact, the moving contact being configured to move to a third predetermined rotation position, at which the moving contact engages with a corresponding grounding contact to ground the switching device.

[0023] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0024] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0025] Figure 1 A schematic diagram of the structure of a prior art switching device is shown;

[0026] Figure 2 A schematic diagram of the structure of a switching device according to an embodiment of the present disclosure is shown;

[0027] Figure 3 A partial structural schematic diagram of a switching device according to an embodiment of the present disclosure is shown;

[0028] Figure 4 An axial plan view of a switching device according to an embodiment of the present disclosure is shown, with the switching device shown in a closed state.

[0029] Figure 5 An axial plan view of a switching device according to an embodiment of the present disclosure is shown, with the switching device shown in an open state.

[0030] Figure 6 An axial plan view of a switching device according to an embodiment of the present disclosure is shown, with the switching device shown in a grounded state;

[0031] Figure 7 A partially enlarged view of an axial plan view of a switching device according to an embodiment of the present disclosure is shown;

[0032] Figure 8 A perspective view of a transmission arm according to an embodiment of the present disclosure is shown;

[0033] Figure 9 A cross-sectional schematic diagram of a transmission arm according to an embodiment of the present disclosure is shown; and

[0034] Figure 10 A perspective view of a power arm according to an embodiment of the present disclosure is shown. Detailed Implementation

[0035] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0036] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0037] Figure 1 A schematic diagram of a switching device 100' according to the prior art is shown. (As shown) Figure 1 As shown, the switching device 100' may include a drive shaft 32' and a moving contact 40' connected to the drive shaft 32'. The switching device 100' employs a direct drive scheme, in which the moving contact 40' is directly driven by the drive shaft 32'. The main drawback of this scheme is that the drive shaft 32' is very large, heavy, and has high manufacturing costs.

[0038] The large size of the 32' drive shaft is mainly due to the following reasons. First, the moving contact is usually made of conductive materials such as copper and withstands extremely high voltages (for example, hundreds of thousands or even millions of volts in high-voltage switchgear). To maintain electrical performance, the moving contact is usually very heavy. Therefore, to meet the strength requirements of the drive shaft, the drive shaft is usually quite large and bulky.

[0039] Secondly, to meet the switching requirements of the switching device, such as the requirement to switch the moving contact between open and closed states within seconds or even milliseconds, a very large torque is required to drive the moving contact. This means that the drive shaft needs to withstand a very large torque, which places high demands on the structural strength of the drive shaft 32'. Therefore, the drive shaft 32' also includes metal reinforcements to enhance its rigidity.

[0040] Furthermore, when air is used as the insulating medium in the switchgear, it is necessary to ensure sufficient insulation gaps between the conductors within the switchgear. For example, when the switchgear is in the open position, the moving and stationary contacts need to have sufficient insulation distance. This insulation distance is a safe distance to ensure the switchgear operates normally without insulation breakdown. Increasing the insulation distance will further increase the size of the device. When the switchgear includes metal reinforcements, it is also necessary to ensure sufficient insulation gaps between the metal reinforcements and other conductors in the switchgear (such as moving and stationary contacts), which will further increase the size of the device. This can be seen from... Figure 1 As can be seen from the structure of the drive shaft 32' shown, the drive shaft 32' is very large, with a complex structure and occupies a very large volume.

[0041] In view of conventional switching devices, an embodiment of the present disclosure provides a switching device. This switching device includes a transmission assembly configured to drive a moving contact. The transmission assembly has a simplified and easily manufactured structure and sufficient structural strength. The switching device according to an embodiment of the present disclosure will be further described below with reference to the accompanying drawings.

[0042] Figure 2 A schematic diagram of the structure of a switching device according to an embodiment of the present disclosure is shown. Figure 3 A partial structural schematic diagram of a switching device according to an embodiment of the present disclosure is shown. As an example of an application scenario, the switching device 100 may be arranged in a switch cabinet. Figure 2 In this embodiment, only a portion of the switch cabinet is shown. It should be understood that this is merely exemplary, and the switch device 100 can be applied independently.

[0043] Such as 2 and Figure 3 As shown, the switching device 100 may include a power arm 10, a transmission assembly 30, and a plurality of moving contacts 40. In the illustrated embodiment, the switching device 100 may include three moving contacts 40. The moving contacts 40 are pivotally mounted to the base 70 via a pivot shaft. The three moving contacts correspond to the three phases of the power supply, respectively. It is worth noting that in the illustrated embodiment, the switching device includes three moving contacts, which is merely exemplary, and the inventive concept of this disclosure can also be applied to other types of switching devices including those with two moving contacts, four moving contacts, etc. Furthermore, the application scenarios of the switching device are not limited to alternating current, but can also be used in direct current scenarios.

[0044] The power arm 10 is configured to receive power and rotate, for example, about a first axis P1 (see also...). Figure 4 In some embodiments, the power arm 10 may be coupled to the power output shaft of the motor to receive power and rotate together with the power output shaft.

[0045] The transmission assembly 30 is connected between the power arm 10 and the moving contact 40, and is adapted to rotate together with the power arm 10 to drive the moving contact 40. Figure 2 and Figure 3 In the illustrated embodiment, the transmission assembly 30 is relative to the rotation center of the power arm 10 (i.e., the first axis P1, see also...). Figure 4 It is eccentrically mounted to the power arm 10 and rotates together with the power arm 10 so that multiple moving contacts 40 rotate synchronously, thereby switching the operating state of the switching device 100.

[0046] According to the switching device of this disclosure, when the power arm 10 rotates, the rotation of the power arm 10 drives the transmission assembly 30 to rotate, and the transmission assembly 30 further drives the moving contact 40 to rotate, thereby realizing the opening and closing operations of the switching device. In some embodiments, the switching device may also be a three-position switch, which, in addition to the opening and closing states, also includes a grounding state. Figure 2 In the illustrated embodiment, to facilitate the demonstration of the internal structure of the switching device, in Figure 2 The diagram also shows a stationary contact 50 and a grounding contact 60. Different operating states of the switching device can be achieved when the moving contact 40 is in different predetermined positions along the rotation path. These will be described in detail later.

[0047] According to embodiments of this disclosure, the moving contact 40 is actuated via a transmission assembly 30, and the transmission assembly 30 is eccentrically arranged relative to the rotation center of the power arm 10. This eccentric arrangement of the transmission assembly 30 provides reliable strength support for the moving contact 40 and significantly reduces the structural complexity of the transmission assembly 30. In some embodiments, substantially all components of the transmission assembly 30 are supported by insulating material. In this case, sufficient insulating clearance required for conductive components within the switching device (e.g., between the moving and stationary contacts) can be ensured, thereby reducing the space occupied by the switching device.

[0048] In some embodiments, such as Figure 2 As shown, the switching device may further include a base 70. Each moving contact 40 is pivotally mounted to the base 70, and the center of rotation of each moving contact 40 coincides with the center of rotation of the power arm 10. In some embodiments, such as Figure 2 and Figure 3As shown, multiple moving contacts 40 are arranged sequentially along the axis containing the rotation center (i.e., the first axis P1) and are collinear with the rotation center of the power arm 10. One advantage of this structure is that it minimizes the area occupied by the rotation of the moving contacts 40. This is because, when the rotation center of the moving contacts 40 is collinear with the rotation center of the power arm 10, the area covered by the rotation of the moving contacts 40 is limited to a circular rotation path area centered on the rotation center. Compared to the case where the rotation center of the moving contacts 40 is not collinear with the rotation center of the power arm 10, the area occupied by the moving contacts 40 is minimized. On the other hand, when the rotation center of the moving contacts 40 is collinear with the rotation center of the power arm 10, it helps to improve the structural strength between the moving contacts 40 and the transmission assembly 30, which will be explained in detail later.

[0049] The transmission assembly 30 may include various implementations. In some embodiments, the transmission assembly 30 is implemented as a lever mechanism. For example... Figure 3 As shown, the transmission assembly 30 may include a drive shaft 32. The drive shaft 32 may have a second axis P2 and is eccentrically mounted to the power arm 10. Each drive shaft corresponds to a corresponding moving contact 40. Thus, the transmission assembly 30 can be eccentrically mounted to the power arm 10 via the drive shaft. The transmission assembly 30 may include a plurality of drive arms 34. The drive arms 34 are arranged sequentially along the second axis P2 and mounted to the drive shaft 32. In some embodiments, one end of each drive arm 34 is attached to the drive shaft 32, and the other end of the drive arm 34 is attached to the moving contact 40. Thus, when the power arm 10 rotates, the drive shaft 32 and the drive arms 34 rotate together, thereby driving the moving contact 40 to rotate. With this linkage mechanism, the driving of the moving contact 40 can be achieved only by the drive arms 34 and the drive shaft 32, which can greatly simplify the structure of the transmission assembly 30, reduce the weight of the transmission assembly 30, and thus reduce the cost of the switching device.

[0050] In some embodiments, such as Figure 3 As shown, when viewed along the first axial direction P1, the transmission arm 34, the power arm 10, and the moving contact 40 form a triangular structure. Therefore, the shape configuration of the transmission arm 34, the power arm 10, and the moving contact 40 itself can provide structural strength for the moving contact 40. During rotation of the moving contact 40, each moving contact 40 is provided with structural support via the triangular structure. Considering the inherent stability of the triangular shape, the stability of the triangle itself is used to constrain the shape between the transmission arm 34, the power arm 10, and the moving contact 40 during rotation, ensuring the structural integrity between them. Furthermore, in some embodiments, all components of the transmission assembly 30 are made of insulating material, avoiding the use of metal parts to increase strength, and further avoiding the problem of small insulation gaps caused by the use of metal parts.

[0051] In some embodiments, viewed along the first axis, the eccentricity between the drive shaft 32 and the power arm 10, the line segment from the attachment point between the drive arm 34 and the moving contact 40 to the second axis P2, and the line segment from the attachment point to the first axis P1 respectively constitute the three sides of a triangle structure. During the rotation of the moving contact 40, the side lengths of the three sides of the triangle structure remain constant. In this case, the overall structural integrity between the drive arm 34, the power arm 10, and the moving contact 40 can be further improved. Figure 3 In the embodiment shown, multiple attachment points P3 are arranged along the third axis P4.

[0052] The following is combined Figures 4-6 The operation process of the switching device according to an embodiment of the present disclosure will be explained. Figure 4 This illustrates that the switching device according to an embodiment of the present disclosure is in the closed state; Figure 5 This illustrates the open state of the switching device according to an embodiment of the present disclosure; Figure 6 The switching device according to an embodiment of the present disclosure is shown in a grounded state.

[0053] To facilitate viewing the relative positions of the drive arm 34, the power arm 10, and the moving contact 40, the switching device is shown as a plan view along the first axis. Furthermore, the figure also shows the stationary contact 50 and the grounding contact 60, which are positioned in a predetermined circumferential direction relative to the moving contact 40. The stationary contact 50 and the grounding contact 60 can be fixedly mounted on the base 70 of the switching device; only the stationary contact 50 and the grounding contact 60 are shown schematically in the figure.

[0054] In some embodiments, such as Figure 4 As shown, the rotation center of the power arm 10 and the transmission arm 34 is shown as point P1, which also represents the first axis. The center of the transmission shaft 32 is shown as point P2, which also represents the second axis used to sequentially arrange the transmission arms 34. The attachment point between the transmission arm 34 and the moving contact 40 is shown as P3. The triangular structure formed by P1, P2, and P3 thus describes the relative positions and structural relationships between the power arm 10, the transmission arm 34, and the moving contact 40. In some embodiments, the triangle can be an acute triangle. It is worth noting that this is merely exemplary, and the triangle can be a right triangle or an obtuse triangle.

[0055] exist Figure 4 In the indicated state, the switching device 100 is in the closed state. In this state, the moving contact 40 is engaged with the stationary contact 40. The power arm 10, the transmission arm 34, and the moving contact 40 form a triangular structure P1-P2-P3. When the power arm 10 rotates counterclockwise, it drives the transmission arm 34 and the moving contact 40 to rotate together, thereby opening the switch device 100 from the closed state. Figure 4The closing status shown has been switched to Figure 5 The circuit breaker is shown in the open position. During the transition from the closed to the open position, the triangular structure formed by P1-P2-P3 remains unchanged. When the power arm 10 moves from... Figure 5 As the indicated state continues to rotate counterclockwise, the power arm 10 continues to drive the transmission arm 34 and the moving contact 40 to rotate together, thereby causing the switching device 100 to... Figure 5 The tripped state is switched to... Figure 6 The grounding state is shown. For example... Figure 6 As shown, the triangular structure formed by P1-P2-P3 remains unchanged during the process of moving from the closed state to the open state.

[0056] Similarly, when the power arm rotates clockwise, the switching device can be switched from the grounded state, the open state, and the closed state. It is worth noting that the above arrangement of the grounding contact and the stationary contact is merely exemplary. The grounding contact and the stationary contact can be arranged in any other suitable position, as long as the insulation distance between them can be ensured.

[0057] It is worth noting that although the illustrated embodiment uses a three-position switch (e.g., an isolating grounding switch) as an example of a switching device to illustrate the principles of embodiments according to this disclosure, this is merely exemplary. In other embodiments, the switching device is a two-position switch, such as an isolating switch or a grounding switch.

[0058] The following is for reference. Figures 7-9 The structural details of the transmission assembly 30 and the power arm 10 according to embodiments of the present disclosure are described below. In some embodiments, the plurality of transmission arms 34 of the transmission assembly 30 may be formed as a single integral component. In some embodiments, the plurality of transmission arms 34 of the transmission assembly 30 may be formed as separate components.

[0059] like Figures 7-9As shown, the drive arm 34 may include a mounting section 344 and a transmission section 342. The mounting section 344 extends along the second axis P2 and is formed as a cylindrical structure. The mounting section 344 may include a mounting hole 343 adapted to receive the drive shaft 32. The mounting hole 343 is connected to the drive shaft 32 by form fit, so that the drive arm 34 rotates together with the drive shaft 32. The transmission section 342 extends from the mounting section 344 and is attached to the moving contact 40. Thus, the mounting section 344 and the drive shaft are conveniently mounted via the mounting section 344, and the transmission section 342 is conveniently coupled to the moving contact via the transmission section 342. In some embodiments, the drive shaft 32 is a shaft including a polygonal profile. As an example, the shaft may include 4, 5, 6, 8, 10, 12, or any other suitable number of sides, and force transmission can be conveniently achieved by form matching. It should be understood that form matching is merely an exemplary method, and other suitable coupling methods may also be used.

[0060] In some embodiments, the drive arm 34 may include a centrally located drive section 342 and a pair of mounting sections 344 on either side of the drive section 342. This is advantageous in terms of molding and assembly of the device. In some embodiments, the drive arm 34 is a one-piece molded insulating injection molded part. The drive arm can be conveniently manufactured from materials such as epoxy resin. When multiple drive arms 34 of the drive assembly 30 are formed as separate components, there is a cost advantage in the manufacturing of the drive arms. In some embodiments, the drive section 342 includes a sheet structure with reinforcing ribs, thereby further reducing the weight of the drive section 342 and ensuring the structural strength of the drive section 342.

[0061] In some embodiments, such as Figure 9 As shown, the mounting section 344 may include a stripping section 3444 and a connecting section 3442. The stripping section 3444 includes a stripping angle suitable for the drive arm 34 to be demolded from the mold. The connecting section 3442 does not have a stripping angle. The connecting section 3442 ensures a form fit between the drive arm 34 and the drive shaft 32. The stripping angle in the stripping section 3444 facilitates demolding of the mold during the injection molding of the drive arm 34. In the illustrated embodiment, the stripping angle is schematically shown as 0.6°; this is merely illustrative, and the stripping angle can be set to other suitable angles as needed.

[0062] In some embodiments, such as Figure 7As shown, the transmission assembly 30 also includes at least one spacer sleeve 36. The spacer sleeve 36 is configured between two adjacent transmission arms 34 to achieve position adjustment of each transmission arm 34. In this way, the cost of manufacturing each transmission arm 34 can be reduced. For example, only one set of transmission arms 34 can be manufactured, and the installation position of the transmission arms 34 can be adjusted only by setting the spacer sleeve 36, without the need to set different molds for transmission arms used for different phases.

[0063] In some embodiments, such as Figures 7-9 As shown, the transmission section 342 can be attached to the moving contact 40 via a shaft hole fit. As an example, such as... Figure 9 As shown, the transmission section 342 may be provided with a pin 346. In some embodiments, the pin is fixed to the transmission section 342 by injection molding. In other embodiments, the pin may be press-fitted into the transmission section 342 by an interference fit, etc. It should be understood that this is merely exemplary, and the pin may be mounted to the transmission section 342 by various other suitable means. Thus, the moving contact 40 and the transmission section 342 of the transmission arm 34 can be connected to each other by the pin. The shaft-hole fit is configured not to affect the rotation of the moving contact 40 about the first axis P1.

[0064] In some embodiments, the moving contact 40 may be formed as a moving contact arm. The moving contact arm may include an adjustment hole 42 adapted to mate with a pin. The size of the adjustment hole 42 is configured to allow the attachment point between the drive arm 34 and the moving contact 40 to self-adapt. This has significant advantages in assembly. Since multiple drive arms 34 are arranged along the drive shaft 32, and considering the machining accuracy issues of the drive arms, drive shaft, and moving contact, it is difficult to ensure that the triangles for each drive arm are always precisely aligned; that is, it is difficult to ensure that multiple attachment points P3 are perfectly aligned along the third axis P4. With the help of the adjustment hole, the attachment points P3 can be approximately aligned along the third axis P4. By providing the adjustment hole 42, the sides of the triangles formed between the drive arm, drive arm, and moving contact can self-adapt. Thus, it is ensured that all moving contacts 30 can be driven synchronously. Furthermore, considering the use of a triangular structure to support the moving contact, since the size of the adjustment hole 42 is configured to allow the attachment point between the drive arm 34 and the moving contact 40 to be adjustable, internal stress between these components can be eliminated, enhancing the structural stability of the transmission assembly.

[0065] The boom 10 may include various implementations. In some embodiments, such as Figure 10As shown, the power arm 10 includes a power coupling portion 14 and an eccentric actuation portion 12. The power coupling portion 14 is adapted to couple with an input shaft (not shown) of a power source to rotate together with the input shaft about a first axis P1. The eccentric actuation portion 12 is arranged eccentrically relative to the power coupling portion 14 and includes a hole 122 adapted to receive a drive shaft 32. In some embodiments, the drive shaft 32 and the hole 122 can achieve power transmission through a form fit.

[0066] In some embodiments, the power coupling 14 may include a metal coupling 142 on the side away from the transmission assembly 30. The metal coupling 142 can be coupled to the input shaft of the power source. The metal coupling 142 ensures that the power arm 10 has sufficient strength to withstand torque. Because the metal coupling 142 is positioned away from the moving contact, stationary contact, and / or ground contact, providing sufficient insulation distance, the use of the metal coupling 142 does not increase the overall size of the switching device. Furthermore, the metal coupling 142 is integrally molded with the power arm 10 via clamp injection molding, and the power arm 10, except for the metal coupling, is made of insulating material. In this case, miniaturization of the switching device can be achieved while ensuring structural strength.

[0067] In some embodiments, the switching device 100 may include a switch such as a disconnecting switch. The switching device may include a plurality of stationary contacts 50. The plurality of stationary contacts 50 are fixedly disposed in the rotation path of a moving contact 40, which is configured to move between a first predetermined rotational position and a second predetermined rotational position. At the first predetermined rotational position, the moving contact 40 engages with a corresponding stationary contact 50 to close the switching device 100, and at the second predetermined rotational position, the moving contact 40 disengages from the corresponding stationary contact to open the switching device 100. Thus, the switching device can be implemented as a two-position switch.

[0068] In some embodiments, the switching device 100 may include a switch such as an isolating grounding switch. In addition to the stationary contact 50, the switching device may also include a plurality of grounding contacts 60. The grounding contacts 60 are fixedly disposed in the rotation path of the moving contact 40, which is also configured to be movable to a third predetermined rotational position, at which the moving contact 40 engages with a corresponding grounding contact 60 to ground the switching device 100. Thus, the switching device 100 can be implemented as a three-position switch.

[0069] It should be understood that the aforementioned disconnector or grounding switch is merely exemplary, and the switch device 100 according to embodiments of this disclosure can be implemented as any other type of switch. Although the inventive concept of embodiments of this disclosure is illustrated by way of an example of a switch device used in a switch cabinet, this is merely exemplary, and the switch device 100 can be independently applied in a power distribution network.

[0070] Furthermore, although the operations are depicted in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0071] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A switching device (100), comprising: Multiple moving contacts (40); A power arm (10) adapted to receive power to rotate about a first axis (P1); as well as A transmission assembly (30) is eccentrically mounted to the power arm (10) relative to the first axis (P1). The transmission assembly (30) is configured to rotate together with the power arm (10) so that the plurality of moving contacts (40) rotate synchronously to switch the operating state of the switching device (100). The switching device (100) further includes a base (70), to which each of the moving contacts (40) is pivotally mounted, and the center of rotation of each of the moving contacts (40) is on the first axis (P1). The transmission assembly (30) includes: The drive shaft (32) has a second axis (P2) parallel to the first axis (P1) and is eccentrically mounted to the power arm (10); as well as Multiple transmission arms (34) corresponding to the multiple moving contacts (40) are arranged sequentially along the second axis (P2). One end of each transmission arm (34) is attached to the transmission shaft (32), and the other end is attached to the moving contact (40), so that the moving contact (40) is actuated by the transmission arm (34) and rotates around the first axis (P1). Viewed along the first axis (P1), the transmission arm (34), the power arm (10), and the moving contact (40) form a triangular structure such that each moving contact (40) is provided with structural support via the triangular structure during the rotation of the plurality of moving contacts (40) around the first axis (P1).

2. The switching device (100) according to claim 1, wherein when viewed along the first axis (P1), the eccentricity of the transmission shaft (32) to the first axis (P1), the line segment of the second axis (P2) to the attachment point (P3) of the transmission arm (34) and the moving contact (40), and the line segment of the attachment point (P3) to the first axis (P1) respectively constitute the three sides of the triangle structure, and the side lengths of the three sides of the triangle structure remain constant during the rotation of the moving contact (40).

3. The switching device (100) according to any one of claims 1-2, wherein the transmission arm (34) comprises: The mounting section (344) extends along the second axis (P2) and includes a mounting hole (343) adapted to receive the drive shaft (32), the mounting hole (343) being form-fitted to the drive shaft (32); and The transmission section (342) extends from the mounting section (344) and is attached to the moving contact (40).

4. The switching device (100) according to claim 3, wherein the transmission arm (34) is an integrally molded insulating injection molded part.

5. The switching device (100) according to claim 4, wherein the mounting section (344) includes a stripping section (3444) and a connecting section (3442), the stripping section (3444) including a stripping angle suitable for the drive arm (34) to be demolded from the mold, and the connecting section (3442) not having the stripping angle to facilitate the form fit between the drive arm (34) and the drive shaft (32).

6. The switching device (100) according to claim 3, wherein the transmission section (342) is attached to the moving contact (40) via a shaft hole engagement.

7. The switching device (100) according to claim 6, wherein the moving contact includes an adjustment hole (42) the size of which is configured to allow the attachment point between the transmission arm (34) and the moving contact (40) to adapt.

8. The switching device (100) according to any one of claims 1-2 and 4-7, wherein the transmission assembly (30) further comprises at least one spacer sleeve (36) configured between two adjacent transmission arms (34).

9. The switching device (100) according to any one of claims 1-2 and 4-7, wherein the drive shaft (32) is a shaft having a polygonal profile and is an integrally molded insulating injection molded part.

10. The switching device (100) according to any one of claims 1-2 and 4-7, wherein the power arm (10) comprises: The power coupling part (14) is adapted to be coupled to the input shaft of the power source so as to rotate together with the input shaft about the first axis (P1); as well as An eccentric actuation part (12) is arranged eccentrically relative to the power coupling part (14) and includes a hole (122) adapted to receive the drive shaft (32).

11. The switching device (100) according to claim 10, wherein the power coupling part (14) includes a metal coupling (142) on the side away from the transmission assembly (30), the metal coupling (142) being integrally formed with the power arm (10) via clamp injection molding, the power arm (10) being made of insulating material except for the metal coupling.

12. The switching device (100) according to any one of claims 1-2, 4-7 and 11, wherein the switching device (100) further comprises a plurality of stationary contacts (50) fixedly disposed in the rotation path of the moving contact (40), the moving contact (40) being configured to move between a first predetermined rotational position and a second predetermined rotational position, wherein at the first predetermined rotational position the moving contact (40) engages with a corresponding stationary contact (50) to close the switching device (100), and at the second predetermined rotational position the moving contact (40) separates from the corresponding stationary contact to open the switching device (100).

13. The switching device (100) according to claim 12, wherein the switching device (100) further comprises a plurality of grounding contacts (60) fixedly disposed in the rotation path of the moving contact (40), the moving contact (40) being further configured to be movable to a third predetermined rotation position at which the moving contact (40) engages with a corresponding grounding contact (60) to ground the switching device (100).

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