Linkage mechanism for switchgear and switchgear

Abstract

A linkage mechanism for a switchgear and the switchgear. The linkage mechanism comprises: a cam assembly having a fixed support plate and a cam rotatably mounted on the support plate, the cam being further fixed to an energy storage shaft of a circuit breaker, capable of rotating with the energy storage shaft; a ratchet wheel fixedly mounted to an operating shaft of an earthing switch; a transmission assembly operably coupled to the cam, the transmission assembly having a catch configured to switch between a first position and a second position, in the first position, the catch is disengaged from the ratchet wheel, allowing the operating shaft of the earthing switch to rotate in a first direction and a second reverse direction opposite to the first direction, in the second position, the catch is engaged with the ratchet wheel, preventing the operating shaft of the earthing switch from rotating in the first direction, allowing the operating shaft to rotate in the second reverse direction, wherein the rotation of the operating shaft of the earthing switch in the first direction corresponds to a closing operation, and the rotation of the operating shaft of the earthing switch in the second direction corresponds to an opening operation.

Description

Technical Field

[0001] This application relates to a linkage mechanism and a switchgear. The linkage mechanism is disposed between the circuit breaker and the grounding switch of the switchgear, and is configured such that when the circuit breaker is in an energy-storing state, the grounding switch is allowed to perform a closing operation, and when the circuit breaker is in an un-energy-storing state, the grounding switch is prevented from performing a closing operation. Background Technology

[0002] Switchgear includes circuit breakers, grounding switches, and disconnecting switches. Circuit breakers have energy-storing and non-energy-storing states. In existing switchgear, the energy-storing and non-energy-storing states of circuit breakers are independent of whether the grounding switch can perform a closing operation. Utility Model Content

[0003] This application provides an interlocking mechanism installed between the circuit breaker and the grounding switch in a switchgear, which links the energy storage state and non-energy storage state of the circuit breaker with whether the grounding switch can be closed. When the circuit breaker is in the energy storage state, it outputs mechanical and electrical signals to interlock this energy storage state with the operation of the grounding switch.

[0004] This application provides a linkage mechanism for a switchgear, wherein the linkage mechanism is disposed between the circuit breaker and the grounding switch of the switchgear, characterized in that the linkage mechanism comprises:

[0005] The cam assembly has a fixed support plate and a cam rotatably mounted on the support plate, the cam being fixed to the energy storage shaft of the circuit breaker and capable of rotating with the energy storage shaft;

[0006] The ratchet is fixedly mounted to the operating shaft of the grounding switch;

[0007] A transmission assembly, operably coupled to a cam, has a latching element configured to switch between a first position and a second position. In the first position, the latching element disengages from a ratchet, allowing the operating shaft of the grounding switch to rotate in a first direction and a second reverse direction opposite to the first direction. In the second position, the latching element engages with the ratchet, preventing rotation of the operating shaft of the grounding switch in the first direction while allowing rotation of the operating shaft in the second reverse direction.

[0008] Specifically, rotation of the operating shaft of the grounding switch in the first direction corresponds to a closing operation, and rotation of the operating shaft of the grounding switch in the second direction corresponds to a opening operation.

[0009] Specifically, in the energy storage state of the circuit breaker, the fastener is in the first position, and in the non-energy storage state of the circuit breaker, the fastener is in the second position.

[0010] Advantageously, the transmission assembly includes: a motion conversion lever rotatably mounted on a support plate, a cam configured to abut against a first end of the motion conversion lever, the rotation center of the motion conversion lever being between the first end and the opposite second end; a first longitudinal rod connected at one end to the second end of the motion conversion lever, the first longitudinal rod being configured to move only in the vertical direction; a rotating rod pivotally mounted to the frame of the grounding switch, the rotating rod having a snap-fit ​​element in the form of a slot; and a second longitudinal rod connecting the first longitudinal rod and the rotating rod, the vertical movement of the first longitudinal rod being transmitted to the rotating rod via the second longitudinal rod.

[0011] Advantageously, the transmission assembly includes a spring connected vertically between the first longitudinal bar and the fixed frame within the switch cabinet to provide a biasing force to the transmission assembly, biasing the latching member to a second position.

[0012] Advantageously, the outer surface of the cam has a first profile portion and a second profile portion, wherein a first distance in the radial direction between the first profile portion and the cam rotation center is greater than a second distance in the radial direction between the second profile portion and the cam rotation center.

[0013] When the circuit breaker is in the energy storage state, the first profile part of the cam abuts against the first end of the motion conversion rod, causing the second end of the motion conversion rod to pull the first longitudinal rod downward, thereby pulling the rotating rod to rotate in the second direction to form a slot that disengages from the ratchet.

[0014] When the circuit breaker is in a non-energy storage state, the second profile portion of the cam abuts against the first end of the motion conversion rod, causing the second end of the motion conversion rod to move upward under the action of the spring force, thereby causing the first longitudinal rod to move upward, and then the rotating rod to rotate along the first direction to form a slot that engages with the ratchet.

[0015] Advantageously, the transmission assembly further includes another rotating rod rotatably mounted on a support plate. This other rotating rod and the motion conversion rod form a scissor-like structure, such that when the circuit breaker is in the energy storage state, the first profile portion of the cam abuts against the first end of the motion conversion rod, and the second profile portion of the cam abuts against the other rotating rod; when the circuit breaker is in the non-energy storage state, the second profile portion of the cam abuts against the first end of the motion conversion rod, and the first profile portion of the cam abuts against the other rotating rod.

[0016] Advantageously, the end of the second longitudinal rod connected to the rotating rod has a first groove and a second groove arranged along the extending direction of the second longitudinal rod. This end of the second longitudinal rod extends through the rotating rod via an opening in the rotating rod, and a blocking portion is also provided inside the opening of the rotating rod.

[0017] A first spring support is disposed in a first groove, and a second spring support is disposed in a second groove. A first spring surrounds the first spring support and is disposed between the top wall of the first groove and the blocking portion. A second spring surrounds the second spring support and is disposed between the bottom wall of the second groove and the blocking portion.

[0018] Advantageously, the second vertical rod is also connected to the rotary block of the disconnecting switch, the rotary block of the disconnecting switch having the same rotation axis as the rotary rod, such that when the second vertical rod moves, the rotary block of the disconnecting switch rotates; and when the rotary block of the disconnecting switch rotates, the second vertical rod moves.

[0019] Advantageously, the first longitudinal rod is inserted through a groove in the operating slide of the disconnect switch, and the first longitudinal rod and the groove are configured such that when the operating slide slides in a horizontal direction perpendicular to the vertical direction, the first longitudinal rod moves within the groove without obstructing the sliding of the operating slide.

[0020] Advantageously, the cam assembly also includes another cam and a micro switch, the other cam and the cam being disposed on opposite sides of the support plate and being rotatable together with the cam, such that in the energy-storing state of the circuit breaker, the other cam presses against the micro switch, and in the non-energy-storing state of the circuit breaker, the other cam does not press against the micro switch.

[0021] This application also provides a switch cabinet, including a circuit breaker, a disconnecting switch, a grounding switch, and a linkage mechanism as described above. Attached Figure Description

[0022] The present invention will now be described in more detail with reference to the accompanying drawings and preferred embodiments, wherein:

[0023] Figure 1 A schematic diagram of the linkage mechanism according to this application is shown.

[0024] Figure 2 Another schematic diagram of the linkage mechanism according to this application is shown.

[0025] Figure 3 A schematic diagram of the cam assembly of the linkage mechanism according to this application is shown.

[0026] Figure 4 A partially enlarged view of the linkage mechanism according to this application is shown.

[0027] Figure 5 Another schematic diagram of the cam assembly of the linkage mechanism according to this application is shown.

[0028] Figure 6 A partial plan view of the linkage mechanism according to this application is shown. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0030] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0031] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, terms such as “a,” “the,” and “described” do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative orientations when the equipment is in use or as shown in the accompanying drawings; these relative orientations may change accordingly when the absolute position of the described object changes.

[0032] Figure 1 A schematic diagram of the linkage mechanism according to this application is shown. This linkage mechanism is arranged between the circuit breaker and the grounding switch in the switchgear. The linkage mechanism includes a cam assembly 1 having a support plate 11 and a cam 12 rotatably mounted on the support plate. The cam 12 is also fixed to the energy storage shaft 2 of the circuit breaker, thereby enabling it to rotate together with the energy storage shaft 2. A transmission assembly 3 is operably coupled to the cam 12, and this transmission assembly has a snap-fit ​​element. A ratchet 4 is fixedly mounted to the operating shaft 5 of the grounding switch.

[0033] The fastener is configured to switch between a first position and a second position, in the first position (e.g.) Figure 1 As shown), the latch disengages from the ratchet, allowing the operating shaft of the grounding switch to rotate in a first direction and a second reverse direction opposite to the first direction, in the second position (as shown). Figure 2As shown), the latch engages with the ratchet, preventing the operating shaft of the grounding switch from rotating in the first direction, while allowing the operating shaft to rotate in the second reverse direction.

[0034] In the energy storage state of the circuit breaker, such as Figure 1 As shown, the energy storage shaft 2 drives the cam 12 to rotate, causing the latch of the transmission component 3 to disengage from the ratchet 4, allowing the operating shaft of the grounding switch to perform a closing operation, i.e., along... Figure 1 Rotate clockwise within the circuit breaker. In the non-energy-storage state of the circuit breaker, such as... Figure 2 As shown, the energy storage shaft 2 drives the cam 12 to rotate so that the latch of the transmission component abuts against the ratchet 4, preventing the operating shaft of the grounding switch from performing a closing operation, that is, preventing the operating shaft from moving along... Figure 1 Rotate clockwise within.

[0035] In addition, the ratchet is configured as a one-way ratchet, so that when the latching member abuts against the ratchet, the latching member prevents the ratchet from rotating clockwise in the figure (preventing the closing operation), but allows the ratchet to rotate counterclockwise in the figure (allowing the opening operation).

[0036] The transmission assembly 3 includes a motion conversion lever 31, which is rotatably mounted on a support plate 11. A cam is configured to abut against a first end of the motion conversion lever. The outer surface of the cam 12 has a first profile portion 121 and a second profile portion 122. The first profile portion 121 is radially further from the center of rotation than the second profile portion 122 is radially further from the center of rotation. In the energy-storing state of the circuit breaker, the first profile portion 121 abuts against the first end of the motion conversion lever 31, such as... Figure 1 As shown. In the non-energy-storage state of the circuit breaker, the second profile portion 122 abuts against the first end of the motion conversion lever 31, as... Figure 3 As shown.

[0037] The transmission assembly also includes a first longitudinal rod 32 connected to a second end of a motion conversion rod, the second end being opposite to the first end. The first longitudinal rod 32 is configured to move vertically. A spring 36 is vertically connected between the first longitudinal rod 32 and a fixed frame within the switch cabinet. A rotating rod 34 is pivotally mounted to the frame of the grounding switch. A second longitudinal rod connects the first longitudinal rod and the rotating rod, configured to transmit the motion of the first longitudinal rod to the rotating rod 34. The rotating rod 34 has a latching element in the form of a slot 341.

[0038] In the energy storage state of the circuit breaker, the first profile portion 121 of the cam abuts against the first end of the motion conversion rod, thereby overcoming the effect of the spring and causing the second end of the motion conversion rod to pull down the first and second longitudinal rods, which in turn pulls the rotating rod 34 to rotate, causing the slot 341 to disengage from the ratchet 4.

[0039] In the non-energy-storage state of the circuit breaker, the second profile portion 122 of the cam abuts against the first end of the motion conversion rod, causing the first end of the motion conversion rod to move downward and the second end to move upward, thereby causing the first longitudinal rod to move upward and push the rotating rod to rotate into a slot to engage the ratchet.

[0040] In other words, as the circuit breaker switches between the energy storage state and the non-energy storage state, the first profile portion and the second profile portion of the cam respectively abut against the first end of the motion conversion rod. This causes the motion conversion rod to move like a seesaw (the rotation center of the motion conversion rod is located between the first end and the second end). That is, when the first end is abutted by the first profile portion, the second end pulls the first vertical rod downward, and when the second end is abutted by the second profile portion, the second end (also including the effect of the spring 36) pushes the first vertical rod upward.

[0041] The transmission assembly 3 also includes another rotating rod 35, which is rotatably mounted on the support plate 11. This other rotating rod 35 and the motion conversion rod 31 form a scissor-like structure, such that when the circuit breaker is in the energy storage state, the first profile portion of the cam abuts against the first end of the motion conversion rod, and the second profile portion of the cam abuts against the other rotating rod. Figure 1 As shown; when the circuit breaker is in a non-energy-storage state, the second profile portion of the cam abuts against the first end of the motion conversion rod, and the first profile portion of the cam abuts against another rotating rod, as shown. Figure 3 As shown.

[0042] The end of the second longitudinal rod 33 connected to the rotating rod 34 has a first groove 331 and a second groove 332 provided along the extension direction of the second longitudinal rod. This end of the second longitudinal rod extends through the opening of the rotating rod and passes through the rotating rod. A blocking part is also provided in the opening of the rotating rod.

[0043] The first spring support 333 is disposed in the first groove, the second spring support 334 is disposed in the second groove, the first spring 335 surrounds the first spring support and is disposed between the top wall of the first groove and the blocking part, and the second spring 336 surrounds the second spring support and is disposed between the bottom wall of the second groove and the blocking part.

[0044] When the second vertical rod 33 moves up or down, the two springs set at the top and bottom can ensure that the rotating rod 34 rotates in place while absorbing the movement error of the transmission chain, thus avoiding the risk of component deformation caused by the movement error of the rigid connection.

[0045] The second vertical rod 33 is also connected to the rotating block 6 of the disconnecting switch. The rotation axis of the rotating block of the disconnecting switch is the same as the rotation axis of the rotating rod, so that when the second vertical rod moves, the rotating block of the disconnecting switch rotates; when the rotating block of the disconnecting switch rotates, the second vertical rod moves.

[0046] For example, such as Figure 6 As shown, when the operating slide 7 of the disconnecting switch moves to the right along the diagram, it will drive the rotating block 6 via the intermediate component 71. Figure 6 Rotating in the direction of the center arrow causes the second vertical rod 34 to move, which in turn causes the first vertical rod to move downward.

[0047] like Figure 6 As shown, a first vertical rod 32 is inserted through the operating slide plate 7 of the disconnecting switch. The first vertical rod is configured not to obstruct the sliding of the operating slide plate in the horizontal direction perpendicular to the vertical direction. For example, the first vertical rod is inserted through the operating slide plate of the disconnecting switch via a groove in the operating slide plate. The first vertical rod and the groove are configured such that when the operating slide plate slides in the horizontal direction perpendicular to the vertical direction, the first vertical rod moves within the groove without obstructing the sliding of the operating slide plate.

[0048] Cam assembly 1 also includes another cam 13 and a micro switch 14, such as Figure 5 As shown, the other cam and the cam are arranged on opposite sides of the support plate and can rotate together with the cam, so that in the energy storage state of the circuit breaker, the other cam presses against the micro switch, and in the non-energy storage state of the circuit breaker, the other cam does not press against the micro switch.

[0049] The linkage mechanism of this application links the energy storage state of the circuit breaker with the closing operation of the grounding switch. Additionally, the energy storage state of the circuit breaker is electrically indicated via another cam and a microswitch. The two cams clamp and rivet the support plate together, thus avoiding the use of screws for fastening and allowing installation in confined spaces.

[0050] Although the present invention has been described in the specification and illustrated in the accompanying drawings with reference to various embodiments, those skilled in the art will understand that the above embodiments are merely preferred embodiments, and some technical features in the embodiments may not be necessary for solving specific technical problems, so these technical features may be omitted or omitted without affecting the solution to the technical problem or the formation of the technical solution; moreover, the features, elements and / or functions of one embodiment may be appropriately combined, combined or coordinated with the features, elements and / or functions of one or more other embodiments, unless such combination, combination or coordination is obviously not feasible.

Claims

1. A linkage mechanism for a switchgear, wherein the linkage mechanism is disposed between the circuit breaker and the grounding switch of the switchgear, characterized in that, The linkage mechanism includes: The cam assembly (1) has a fixed support plate (11) and a cam (12) rotatably mounted on the support plate, the cam (12) being also fixed to the energy storage shaft (2) of the circuit breaker and capable of rotating with the energy storage shaft (2); Ratchet (4) is fixedly installed on the operating shaft (5) of the grounding switch; A transmission assembly (3), operably coupled to a cam (12), has a latching element configured to switch between a first position and a second position. In the first position, the latching element disengages from a ratchet, allowing the operating shaft of the grounding switch to rotate in a first direction and a second reverse direction opposite to the first direction. In the second position, the latching element engages with the ratchet, preventing rotation of the operating shaft of the grounding switch in the first direction and allowing rotation of the operating shaft in the second reverse direction. Specifically, rotation of the operating shaft of the grounding switch in the first direction corresponds to a closing operation, and rotation of the operating shaft of the grounding switch in the second direction corresponds to a opening operation. Specifically, in the energy storage state of the circuit breaker, the fastener is in the first position, and in the non-energy storage state of the circuit breaker, the fastener is in the second position.

2. The linkage mechanism as described in claim 1, characterized in that, The transmission component (3) includes: A motion conversion lever (31) is rotatably mounted on a support plate (11), and a cam is configured to abut against a first end of the motion conversion lever, the rotation center of the motion conversion lever being between the first end and the opposite second end of the motion conversion lever; The first vertical rod (32) is connected at one end to the second end of the motion conversion rod, and the first vertical rod (32) is configured to move only in the vertical direction. A rotating rod (34), pivotally mounted to the frame of the grounding switch, has a latching element in the form of a slot (341). The second longitudinal bar (33) connects the first longitudinal bar (32) and the rotating bar (34). The vertical movement of the first longitudinal bar (32) is transmitted to the rotating bar (34) through the second longitudinal bar (33).

3. The linkage mechanism as described in claim 2, characterized in that, The transmission assembly (3) includes a spring (36) which is vertically connected between the first longitudinal bar (32) and the fixed frame inside the switch cabinet to provide a biasing force to the transmission assembly, biasing the latch to a second position.

4. The linkage mechanism as described in claim 2, characterized in that, The outer surface of the cam (12) has a first profile portion and a second profile portion. The first profile portion is at a first distance from the cam rotation center in the radial direction, which is greater than the second profile portion is at a second distance from the cam rotation center in the radial direction. When the circuit breaker is in the energy storage state, the first profile part of the cam abuts against the first end of the motion conversion rod, causing the second end of the motion conversion rod to pull the first longitudinal rod downward, thereby pulling the rotating rod to rotate in the second direction to form a slot that disengages from the ratchet. When the circuit breaker is in a non-energy storage state, the second profile portion of the cam abuts against the first end of the motion conversion rod, causing the second end of the motion conversion rod to move upward under the action of the spring force, thereby causing the first longitudinal rod to move upward, and then the rotating rod to rotate along the first direction to form a slot that engages with the ratchet.

5. The linkage mechanism as described in claim 2, characterized in that, The transmission assembly (3) also includes another rotating rod (35), which is rotatably mounted on the support plate (11). The other rotating rod (35) and the motion conversion rod (31) form a scissor structure, such that when the circuit breaker is in the energy storage state, the first profile portion of the cam abuts against the first end of the motion conversion rod, and the second profile portion of the cam abuts against the other rotating rod; when the circuit breaker is in the non-energy storage state, the second profile portion of the cam abuts against the first end of the motion conversion rod, and the first profile portion of the cam abuts against the other rotating rod.

6. The linkage mechanism as described in claim 2, characterized in that, The end of the second longitudinal rod (33) connected to the rotating rod (34) has a first groove (331) and a second groove (332) provided along the extending direction of the second longitudinal rod. This end of the second longitudinal rod extends through the opening of the rotating rod and passes through the rotating rod. A blocking portion is also provided in the opening of the rotating rod. The first spring support (333) is disposed in the first groove, the second spring support (334) is disposed in the second groove, the first spring (335) surrounds the first spring support and is disposed between the top wall of the first groove and the blocking part, and the second spring (336) surrounds the second spring support and is disposed between the bottom wall of the second groove and the blocking part.

7. The linkage mechanism as described in claim 2, characterized in that, The second vertical rod (33) is also connected to the rotating block (6) of the disconnecting switch, the rotating axis of which is the same as the rotating rod's rotating axis, such that when the second vertical rod moves, the rotating block of the disconnecting switch rotates; when the rotating block of the disconnecting switch rotates, the second vertical rod moves.

8. The linkage mechanism as described in claim 7, characterized in that, The first vertical rod (32) is inserted through the operating slide of the disconnect switch via a groove in the operating slide of the disconnect switch. The first vertical rod (32) and the groove are configured such that when the operating slide slides in a horizontal direction perpendicular to the vertical direction, the first vertical rod moves in the groove without obstructing the sliding of the operating slide.

9. The linkage mechanism as described in any one of claims 1 to 8, characterized in that, The cam assembly also includes another cam (13) and a micro switch (14), which are disposed on opposite sides of the support plate and are rotatable together with the cam, such that in the energy storage state of the circuit breaker, the other cam presses against the micro switch, and in the non-energy storage state of the circuit breaker, the other cam does not press against the micro switch.

10. A switch cabinet, characterized in that, It includes circuit breakers, disconnect switches, grounding switches, and linkage mechanisms as described in any one of claims 1 to 9.

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