CN217847729U

CN217847729U - Auxiliary switch device for switch cabinet and switch cabinet comprising same

Info

Publication number: CN217847729U
Application number: CN202221361455.2U
Authority: CN
Inventors: 王玉军; 刘晓丽; 胡慕荣; 王腊洪
Original assignee: Eaton Electrical Equipment Co Ltd
Current assignee: Eaton Electrical Equipment Co Ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-11-18
Anticipated expiration: 2032-06-01

Abstract

The utility model relates to a cubical switchboard that is used for auxiliary switch device of cubical switchboard and includes it, this auxiliary switch device includes: two cams fitted to the drive shaft, the two cams being spaced apart from each other and arranged at an angle in a circumferential direction; two auxiliary switch bodies aligned in a direction parallel to the axial direction of the drive shaft and respectively opposed to the two cams, each auxiliary switch body including at least two indication switches and a switching shaft connected to the at least two indication switches, an end of each switching shaft remote from the corresponding indication switch being rotatably connected with a pinch roller opposed to the corresponding cam; when the driving shaft is in the first state, the pressing wheel of the first auxiliary switch body in the two auxiliary switch bodies is pressed by the lift profile of the first cam in the two cams to drive the corresponding switching shaft to operate the corresponding indicating switch to be conducted, and meanwhile, the pressing wheel of the second auxiliary switch body in the two auxiliary switch bodies is arranged in a tangent mode with the base circle profile of the second cam in the two cams and is basically not affected by external force.

Description

Auxiliary switch device for switch cabinet and switch cabinet comprising same

Technical Field

The utility model relates to an electrical equipment technical field especially relates to a cubical switchboard that is used for auxiliary device of cubical switchboard to reach including it.

Background

A switch cabinet is widely used in various fields as an important electrical device, and may generally include a primary electrical component that may be in different position states and an auxiliary switch for determining the position state of the primary electrical component. For example, the primary electrical element may be a grounding switch capable of being in a closing or opening state, and the auxiliary switch may be linked with a rotation shaft of the grounding switch to be turned on or off when the grounding switch moves to the opening position or the closing position, so that the state of the grounding switch can be determined by whether a control device electrically connected to the auxiliary switch detects an electrical signal in the auxiliary switch.

However, in the prior art, each component of the auxiliary switch device used for linking with the primary electrical element is respectively installed in the cabinet body of the switch cabinet, so the auxiliary switch device has the defects of tedious installation of each component and inaccurate installation and positioning, and further has the defect of causing safety risk due to inaccurate state judgment of the primary electrical element caused by installation error between the auxiliary switch device and the primary electrical element.

Accordingly, there is a need in the art for an auxiliary switching device that is accurately installable and has high reliability.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an auxiliary switch device for cubical switchboard that can solve above-mentioned part problem at least.

The utility model discloses still aim at providing an use above-mentioned modified auxiliary switch device's cubical switchboard.

According to an aspect of the present invention, there is provided an auxiliary switching device for a switchgear, the switchgear comprising an electrical element having a first state and a second state and a drive shaft for driving the electrical element to switch between the first state and the second state, the auxiliary switching device comprising: two cams journaled to the drive shaft, the two cams being spaced from each other and arranged at an angle in a circumferential direction; two auxiliary switch bodies aligned in a direction parallel to the axial direction of the drive shaft and respectively opposed to the two cams, each of the auxiliary switch bodies including at least two indication switches and a switching shaft connected to the at least two indication switches, an end of each of the switching shafts remote from the corresponding indication switch being rotatably connected with a pinch roller opposed to the corresponding cam; when the driving shaft is in a first state, the pressing wheel of the first auxiliary switch body in the two auxiliary switch bodies is pressed by the lift profile of the first cam in the two cams to drive the corresponding switching shaft to operate the corresponding indicating switch to be conducted, and meanwhile, the pressing wheel of the second auxiliary switch body in the two auxiliary switch bodies is arranged in a tangent mode with the base circle profile of the second cam in the two cams and is basically not affected by external force.

Compared with the prior art, the utility model discloses a first state or the second state of electric elements are monitored respectively with the cooperation of two auxiliary switch bodies to two cams of auxiliary switch device accessible to can improve monitoring accuracy and reliability. In addition, the auxiliary switch device can provide a plurality of indication signals when the electric element is in the first state or the second state by providing at least two indication switches in each auxiliary switch body, thereby improving the convenience of use. Finally, the two auxiliary switch bodies can be arranged in an orientation in which the pinch roller of the second auxiliary switch body is tangent to the base circle profile of the second cam, which facilitates accurate installation of a plurality of parts of the auxiliary switch device to the cabinet body of the switch cabinet, reducing the debugging workload.

Preferably, when the driving shaft is in the second state, the pressing wheel of the second auxiliary switch body is pressed by the lift profile of the second cam to drive the corresponding switching shaft to operate the corresponding indication switch to be turned on, while the pressing wheel of the first auxiliary switch body is arranged tangentially to the base circle profile of the first cam without being substantially acted on by an external force.

Preferably, the base circle profiles of the first cam and the second cam are provided with positioning grooves aligned along the axial direction.

Preferably, the auxiliary switching device includes a frame plate mounted to the switchgear, a pair of support plates fixed to the frame plate, and a bushing passing through the pair of support plates, the bushing being peripherally inserted to the drive shaft and peripherally inserted with the two cams.

Preferably, the shaft sleeve extends to exceed the peripheries of the end parts of the pair of supporting plates and is provided with a clamping ring.

Preferably, the auxiliary switch body is mounted to the frame plate via at least two fasteners.

Preferably, the auxiliary switch device further comprises a pad cover, and the fastener passes through the auxiliary switch body and the pad cover to be connected to the frame plate so as to clamp the pad cover between the auxiliary switch body and the frame plate.

Preferably, the rotational axis of the pinch roller is parallel to the rotational axis of the cams, and the center of rotation of the pinch roller is closer to the frame plate than the center of rotation of the respective cams.

Preferably, the switching shafts are configured to move linearly in a radial direction of the respective pressing wheel.

According to another aspect of the present invention, there is also provided a switchgear comprising an electrical element having a first state and a second state and a drive shaft for driving the electrical element to switch between the first state and the second state, the switchgear comprising the aforementioned auxiliary switching device.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the invention.

Drawings

Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

fig. 1 is a first schematic perspective view of an auxiliary switching device according to the present invention;

FIG. 2 is a front view of the auxiliary switching device of FIG. 1;

FIG. 3A isbase:Sub>A cross-sectional view of the auxiliary switching device of FIG. 2 taken along A-A and looking to the left;

FIG. 3B isbase:Sub>A cross-sectional view of the auxiliary switching device of FIG. 2 taken along A-A and looking to the right;

fig. 4 is a second perspective view of an auxiliary switching device according to the present invention;

FIG. 5 is a front view of the auxiliary switching device of FIG. 4;

FIG. 6A is a cross-sectional view of the auxiliary switching device of FIG. 5 taken along B-B and looking to the left;

fig. 6B is a sectional view of the auxiliary switching device of fig. 5 taken along B-B and viewed to the right.

Description of reference numerals:

10-an auxiliary switching device; 11-a first cam; 111 — lift profile of first cam; 112 — base circle profile of first cam; 113-a detent of the first cam; 12-a second cam; 121 — lift profile of second cam; 122 — base circle profile of second cam; 123-a positioning groove of the second cam; 13-a first auxiliary switch body; 131-a first switching shaft; 132-a first housing; 133-a first puck; 14-a second auxiliary switch body; 141-a second switching shaft; 142-a second housing; 143-a second pinch roller; 15-a support plate; 16-shaft sleeve; 17-a snap ring; 18-a fastener; 19-cushion cover; 20-frame plate.

Detailed Description

Referring now to the drawings, a schematic of the disclosed auxiliary switching device for a switchgear is illustrated in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the disclosure of the present invention. The position of some components in the attached drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

The terms "joined," "connected," and the like as used herein, include both two components that are indirectly connected together through an intermediate layer (e.g., an adhesive, a solder, etc.) or an intermediate member (e.g., a connector, a transition member, etc.), and two components that are directly connected together without any intermediate layer (e.g., an adhesive, a solder, etc.) or intermediate member (e.g., a connector, a transition member, etc.).

Fig. 1 to 6B show, by way of example, an auxiliary switching device 10 for a switchgear cabinet according to the present invention, which may comprise a cabinet body, an electrical element mounted to the cabinet body and having a first state and a second state, and a drive shaft for driving the electrical element to switch between the first state and the second state. The auxiliary switching device 10 may be mounted to the cabinet and be interlocked with the driving shaft so as to be correspondingly moved to different states when the driving shaft controls the state change of the electrical components, thereby monitoring the states of the electrical components. For example, the electrical component may be a grounding switch having a closed state and an open state, and the auxiliary switching device 10 may be used to determine the switch state of the grounding switch, thereby ensuring reliable operation of the switchgear. In the illustrated embodiment, the auxiliary switch device 10 may include two cams and two auxiliary switch bodies.

As shown in fig. 1 to 3B, the driving shaft controls the grounding switch to move to a closing state, and the two cams sleeved on the driving shaft and spaced from each other rotate correspondingly along with the driving shaft. The two cams are arranged on the drive shaft at an angle to one another in the circumferential direction, for example in a radially opposite orientation, so that the first cam 11 of the two cams is rotated with its lift profile 111 generally downwards and the second cam 12 of the two cams is rotated with its lift profile 121 generally upwards. The two auxiliary switch bodies are arranged opposite to the two cams, respectively, and a first auxiliary switch body 13 of the two auxiliary switch bodies is switchable between an on state and an off state in cooperation with the first cam 11, and a second auxiliary switch body 14 is switchable between an on state and an off state in cooperation with the second cam 12, in contrast to a direction parallel to the axial direction of the drive shaft.

The auxiliary switch body can comprise a shell, at least two indicating switches accommodated in the shell and a switching shaft connected to the at least two indicating switches and extending out of the shell, and the end part of the switching shaft extending out of the shell is rotatably connected with a pressing wheel. It will be appreciated that the number of indication switches may be selected according to actual requirements. For convenience of explanation, the indication switch, the switching shaft, the pinch roller, and the case of the first auxiliary switch body 13 will be described as a first indication switch, a first switching shaft 131, a first pinch roller 133, and a first case 132, and the indication switch, the switching shaft, the pinch roller, and the case of the second auxiliary switch body 14 will be described as a second indication switch, a second switching shaft 141, a second pinch roller 143, and a second case 142.

Referring to fig. 1 to 3B, the driving shaft drives the first cam 11 to rotate clockwise as shown in fig. 3A to the switching-on position, the lift profile of the first cam 11 is engaged with the first pressing wheel 133 in a rolling manner and presses the first pressing wheel 133 to move downward, and the first switching shaft 131 can move downward linearly along the radial direction of the first pressing wheel 133 to drive the first indication switch to be switched off. At the same time, the drive shaft is rotated counterclockwise as shown in fig. 3B to the on position, base circle profile 122 of second cam 12 remains tangent to the outer periphery of second pressure roller 143, second pressure roller 143 is thus stationary without external force, second switching shaft 141 remains stationary and the second indication switch is in the off state. The control device detects the electric signal in the first indicating switch, so that the grounding switch is judged to be in a closing state.

Therefore, when the auxiliary switch device 10 of the present invention is installed to the cabinet body of the switch cabinet, the grounding switch can be first operated to move to the switching-on position, and then the first cam 11 and the second cam 12 are aligned along the axial direction of the driving shaft, and then the first auxiliary switch body 13 and the second auxiliary switch body 14 are installed in the orientation where the second pressing wheel 143 of the second auxiliary switch body 14 is tangent to the second cam 12. In this way, the accurate positioning of a plurality of components of the auxiliary switching device 10 relative to each other can be achieved, so that no additional commissioning is required after installation to the switchgear. In addition, a plurality of contacts for indicating that the grounding switch is in a closing state can be provided by arranging a plurality of first indicating switches, and convenience is improved.

Further, as shown in fig. 4 to 6B, when the driving shaft rotates clockwise as shown in fig. 6B to the opening position, the lift profile 121 of the second cam 12 rollingly engages the second pressure roller 143 and presses the second pressure roller 143 to move downward, and the second switching shaft 141 moves linearly downward in the radial direction of the second pressure roller 143 to operate the second indication switch to be turned off. At the same time, the driving shaft rotates counterclockwise to the open position shown in fig. 6A, the base circle profile 112 of the first cam 11 is tangent to the outer circumference of the first pressing wheel 133, the first pressing wheel 133 is not acted by external force and is stationary, the first switching shaft 131 is stationary, and the first indicating switch returns to the off state. The control device judges that the grounding switch is in the opening state by detecting the electric signal in the second indicating switch.

Therefore, the utility model discloses an auxiliary switch device 10 can accurately judge that earthing switch is in combined floodgate state or separating brake state through the cooperation of first auxiliary switch body 13 with first cam 11 and the cooperation of second auxiliary switch body 14 with second cam 12, this compares with the device that only is equipped with a single auxiliary switch body and single cam, can avoid single auxiliary switch body to switch over the on-state in advance when earthing switch does not reach the combined floodgate position, and then has avoided because of the wrong safe risk that judges that earthing switch has been in combined floodgate state and bring.

Alternatively, as shown in fig. 4 and 5, the first cam 11 and the second cam 12 may be provided with axially aligned

detents

113 and 123 on the respective base circular profiles, so that during installation of the first cam 11 and the second cam 12 telescoped to the drive shaft, the detents 113 on the first cam 11 may be brought into axial alignment with the detents 123 on the second cam 12, which facilitates accurate installation of the first cam 11 and the second cam 12 on the drive shaft.

Optionally, the auxiliary switching device 10 may further include a frame plate 20, a pair of support plates 15, a bushing 16, and a snap ring 17. The frame plate 20 may be mounted to the cabinet body of the switchgear cabinet, the support plate 15 and the frame plate 20 may be one piece or integral parts welded to each other and may be provided with through holes, and the bushings 16 may be mounted on the support plate 15 through the through holes of the support plate 15. The inner circumference of the boss 16 may be fitted to the outer circumference of the drive shaft formed as a hexagonal shaft, and the first cam 11 and the second cam 12 may be fitted over the outer circumference of the boss 16. The outer peripheral surface of the sleeve 16 may be provided with a positioning flat surface along the circumferential direction, and the inner peripheries of the first cam 11 and the second cam 12 may be provided with a positioning flat surface along the axial direction. Therefore, when the driving shaft rotates, the shaft sleeve 16 can be driven to rotate, and the shaft sleeve 16 drives the first cam 11 and the second cam 12 to rotate, so that the first cam 11 and the second cam 12 rotate along with the driving shaft.

The section of the shaft sleeve 16 between the pair of support plates 15 is used for installing the first cam 11 and the second cam 12, the two ends of the shaft sleeve 16 extending out of the support plates 15 can be provided with clamping grooves along the circumferential direction, and the clamping rings 17 are clamped to the clamping grooves at the two ends of the shaft sleeve 16 to prevent the shaft sleeve 16 from moving axially relative to the support plates 15. Here, the snap ring 17 may be a circular ring made of a metal material having a certain elasticity and configured to have a circumferential gap. The inner diameter of snap ring 17 may be designed to be smaller than the outer diameter of shaft sleeve 16 in a natural state and larger than the outer diameter of shaft sleeve 16 when being forced to expand, so that a force may be applied to snap ring 17 to expand the gap of snap ring 17 and mount it to the snap groove of shaft sleeve 16, and the force applied to snap ring 17 is removed after the mounting is completed to firmly connect snap ring 17 to the snap groove.

In the installation process, the first cam 11 and the second cam 12 may be fitted to the boss 16, the support plate 15 may be fitted and the snap ring 17 may be installed to both ends of the boss 16, respectively, and then the support plate 15 may be welded to the frame plate 20 with the boss 16, the first cam 11 and the second cam 12, and the support plate 15 and the snap ring 17 as an integral component. Subsequently, the second auxiliary switch body 14 and the first auxiliary switch body 13 are mounted to the frame plate 20 via the fastener 18 in a state in which the second pressing wheel 143 of the second auxiliary switch body 14 is tangent to the base circle profile 122 of the second cam 12, whereby the relative positions of the respective parts of the auxiliary switch device 10 are fixed on the frame plate 20, and the auxiliary switch device is mounted by mounting the frame plate 20 to the switchgear in this orientation.

Wherein the fastener 18 is connectable to the frame plate 20 through each of the auxiliary switch bodies and through the grommet 19, so that the grommet 19 is clamped between the auxiliary switch body and the frame plate 20 while the auxiliary switch body is spaced relative to the frame plate 20 when the fastener 18 is mounted to the frame plate 20. The axial length of the pad cover 19 is configured such that the center of rotation of the first pressing wheel 133 is closer to the frame plate 20 than the center of rotation of the first cam 11, and the center of rotation of the second pressing wheel 143 is closer to the frame plate 20 than the center of rotation of the second cam 12. Alternatively, the auxiliary switch body may be mounted to the frame plate 20 via two fasteners 18 arranged at the diagonals of the auxiliary switch body to reduce costs while ensuring connection.

In this way, when the drive shaft rotates from the opening state shown in fig. 6A and 6B to the closing state shown in fig. 3A and 3B, the portion of the lift profile of the first cam 11 away from the frame plate 20 engages the first pinch roller 133, and therefore when the switchgear vibrates such that a slight deviation occurs in the position of some component such as the drive shaft or the first indication switch, the first cam 11 can be prevented from rotating out of engagement with the first pinch roller 133 in the counterclockwise direction in fig. 3A due to the deviation, so that the first indication switch can be reliably kept on, thereby accurately indicating that the earthing switch is in the closing state. Similarly, when the drive shaft rotates from the closing state shown in fig. 3A and 3B to the opening state shown in fig. 6A and 6B, the portion of the lift profile 121 of the second cam 12 adjacent to the frame plate 20 engages the second pressure roller 143, so that when the switch cabinet is accidentally offset, the second cam 12 is prevented from rotating in the counterclockwise direction shown in fig. 6B out of engagement with the second pressure roller 143, thereby reliably keeping the second indication switch conductive, and thus accurately indicating that the grounding switch is in the opening state.

It is understood that the auxiliary switching device 10 of the present invention can also be used for other electrical components of a switchgear having two different states, such as a circuit breaker mechanism, etc., to monitor the state of the circuit breaker mechanism. Further, the auxiliary switch device 10 of the present invention may additionally include a third cam and a third auxiliary switch body, wherein the third cam may be located between the first cam 11 and the second cam 12 along the circumferential direction of the driving shaft, so as to press the third auxiliary switch body to switch to the on state when the third cam rotates to the lift profile and faces downward in general. Thus, the auxiliary switching device 10 can be used to monitor the status of electrical components having three different states, such as a three-position isolating grounding switch mechanism.

It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims

1. An auxiliary switching device (10) for a switchgear cabinet comprising an electrical element having a first state and a second state and a drive shaft for driving the electrical element to switch between the first state and the second state, characterized in that the auxiliary switching device (10) comprises:

two cams journaled to the drive shaft, the two cams being spaced from each other and arranged at an angle in a circumferential direction;

two auxiliary switch bodies aligned in a direction parallel to the axial direction of the drive shaft and respectively opposed to the two cams, each of the auxiliary switch bodies including at least two indication switches and a switching shaft connected to the at least two indication switches, an end of each of the switching shafts remote from the corresponding indication switch being rotatably connected with a pinch roller opposed to the corresponding cam;

when the driving shaft is in a first state, the pressing wheel of a first auxiliary switch body (13) of the two auxiliary switch bodies is pressed by the lift profile (111) of a first cam (11) of the two cams to drive the corresponding switching shaft to operate the corresponding indicating switch to be conducted, and meanwhile, the pressing wheel of a second auxiliary switch body (14) of the two auxiliary switch bodies is arranged tangentially to the base circle profile (122) of a second cam (12) of the two cams and is not basically acted by external force.

2. Auxiliary switching device (10) for a switchgear cabinet according to claim 1, characterized in that when the driving shaft is in the second state, the pressure wheel of the second auxiliary switch body (14) is pressed by the lift profile (121) of the second cam (12) to bring the respective switching shaft into operation with the respective indicating switch conducting, while the pressure wheel of the first auxiliary switch body (13) is arranged tangentially to the base circle profile (112) of the first cam (11) substantially without being subjected to external forces.

3. Auxiliary switching device (10) for a switchgear cabinet according to claim 2, characterized in that the base circle profiles of the first cam (11) and the second cam (12) are provided with axially aligned positioning slots.

4. The auxiliary switching device (10) for a switchgear cabinet according to claim 2, characterized in that the auxiliary switching device (10) comprises a frame plate (20) mounted to the cabinet body of the switchgear cabinet, a pair of support plates (15) fixed to the frame plate (20) and bushings (16) passing through the pair of support plates (15), the bushings (16) being sleeved internally to the drive shaft and externally to the two cams.

5. Auxiliary switching device (10) for a switchgear cabinet according to claim 4, characterized in that said bushing (16) is provided with a snap ring (17) on the periphery of the end portion extending beyond said pair of support plates (15).

6. The auxiliary switching device (10) for a switchgear cabinet according to claim 4, characterized in that the auxiliary switch body is mounted to the frame plate (20) via at least two fasteners (18).

7. Auxiliary switching device (10) for a switchgear cabinet according to claim 6, characterized in that the auxiliary switching device (10) further comprises a pad (19), the fastener (18) being connected to the frame plate (20) through the auxiliary switch body and pad (19) to clamp the pad (19) between the auxiliary switch body and the frame plate (20).

8. Auxiliary switching device (10) for a switchgear cabinet according to claim 7, characterized in that the axis of rotation of the pinch roller is parallel to the axis of rotation of the cam, and the centre of rotation of the pinch roller is closer to the frame plate (20) than the centre of rotation of the respective cam.

9. Auxiliary switching device (10) for a switchgear cabinet according to claim 1, characterized in that the switching shaft is configured to move linearly in the radial direction of the respective press wheel.

10. A switchgear cabinet comprising an electrical element having a first state and a second state and a drive shaft for driving the electrical element to switch between the first state and the second state, characterized in that the switchgear cabinet comprises an auxiliary switching device (10) according to any of claims 1-9.