CN219105956U - Status indicating device and dual power transfer switch - Google Patents

Abstract

The present disclosure relates to a status indication device and a dual power transfer switch. The status indication device (100) comprises: a rocker arm (110), a first microswitch (120), a second microswitch (130), and a retaining mechanism (160), the retaining mechanism (160) configured to retain the rocker arm (110) in an intermediate position between the first circumferential position and the second circumferential position. According to the present disclosure, the accuracy of the status indication can be improved, and the electrical safety is improved.

Description

Status indicating device and dual power transfer switch

Technical Field

Embodiments of the present disclosure relate generally to dual power switches, and more particularly, to a status indication device for indicating a switching status of a dual power switch.

Background

In some critical load applications, it is desirable to continuously power the critical load. For this purpose, a backup power source such as a battery or a generator is provided in addition to a main power source such as a mains power source. The dual power transfer switch is used to switch between the main power supply and the backup power supply. Under the normal operating state of the main power supply, the dual-power transfer switch is in a first switching-on state of switching on with the main power supply and switching off with the standby power supply. Under the condition of main power failure, the dual-power transfer switch is in a second switching-on state of switching on with the standby power supply and switching off with the main power supply.

In some cases, for example, in the case where the dual power transfer switch needs maintenance, the dual power transfer switch is in a state of being evenly disconnected from the main power source and the standby power source (i.e., dual power off position). When the double-power change-over switch is positioned at the double-power switching-off position, the moving contact shakes at the double-power switching-off position, so that the conventional state indicating device has the risk of error indication. It is desirable to be able to retrofit conventional status indicating devices.

Disclosure of Invention

Embodiments of the present disclosure provide a status indication device and dual power transfer switch that aim to address one or more of the above problems, as well as other potential problems.

According to a first aspect of the present disclosure, a status indicating device for a dual power transfer switch is provided. The status indication device comprises: a rocker arm rigidly connected to a moving contact main shaft of the dual power transfer switch and configured to rotate between a first power closing position and a second power closing position; a first microswitch arranged at a first circumferential position around the rocker arm; a second microswitch arranged at a second circumferential position around the rocker arm that is different from the first circumferential position; and a holding mechanism configured to hold the rocker arm in an intermediate position between the first circumferential position and the second circumferential position, the intermediate position corresponding to a dual-power-supply-off position of the dual-power transfer switch; wherein the rocker arm is configured to: when rotating to one of the first power supply closing position and the second power supply closing position, the rocker arm triggers the first micro switch at the first circumferential position; the rocker arm triggers the second micro switch at the second circumferential position when rotating to the other of the first power closing position and the second power closing position; and when the rocker arm rotates to the middle position, the rocker arm simultaneously triggers the first micro switch and the second micro switch or simultaneously breaks away from contact with the first micro switch and the second micro switch.

According to the present disclosure, since the holding mechanism is provided, the rocker arm can be held at a predetermined dual-power-supply opening position, thereby preventing the stopper contact from being biased to either side, causing a potential safety hazard; further, by preventing the rocker arm from being biased to either side, the accuracy of the status indication is improved.

In some embodiments, the first and second micro-switches may each include a lever contact arm, and the rocker arm may be configured to trigger the lever contact arm to trigger a respective micro-switch action. Thus, even if the lever contact arm is hit with a large force, the indication can be reliably provided.

In some embodiments, the lever contact arm may include a lever body and a contact portion protruding from the lever body toward a rotation center of the rocker arm, the rocker arm being configured to press the contact portion to trigger a corresponding micro-switch action. Through the contact portion, reliable triggering of the rocker arm on the micro switch is ensured. In some embodiments, the contact portion may include an arcuate protrusion.

In some embodiments, the rocker arm may be configured to: triggering the first micro switch and the second micro switch simultaneously when rotating to the middle position; when rotated to the first power-on position, the first micro-switch is out of contact with the first micro-switch at the first circumferential position and the second micro-switch is triggered at the second circumferential position; when rotated to the second power on position, the first micro switch is triggered at the first circumferential position and is out of contact with the second micro switch at the second circumferential position. Therefore, even if the internal fault of the micro switch can not provide a correct indication, the indication can be ensured to be at the opening position, and potential safety hazards are avoided.

In some embodiments, the status indication device may further comprise a status transition device configured to: providing an indication that the dual-power transfer switch is in a dual-power switching-off position under the condition that the first micro switch and the second micro switch are triggered simultaneously; providing an indication that the dual power transfer switch is in the second power switch-on position if the first micro switch is triggered and the second micro switch is not triggered; providing an indication that the dual power switch is in the first power on position if the first micro switch is not triggered and the second micro switch is triggered.

In some embodiments, the rocker arm may be configured to: when rotated to the neutral position, the switch is out of contact with both the first micro switch and the second micro switch to provide an indication that the dual-power transfer switch is in a dual-power off position; triggering the first micro-switch at the first circumferential position and out of contact with the second micro-switch at the second circumferential position upon rotation to the first power-on position to provide an indication that the dual-power transfer switch is in the first power-on position; and when the double-power transfer switch rotates to the second power switching-on position, the double-power transfer switch is out of contact with the first micro switch at the first circumferential position and triggers the second micro switch at the second circumferential position so as to provide an indication that the double-power transfer switch is in the second power switching-on position. Thereby, the structure of the status indication device can be simplified.

In some embodiments, the retention mechanism may be configured to: maintaining a clearance with the rocker arm when the rocker arm is in the neutral position; applying a torque to the rocker arm that resists movement of the rocker arm away from the neutral position as the rocker arm moves from the neutral position toward the first circumferential position or the second circumferential position; and applying a torque to the rocker arm that facilitates movement of the rocker arm toward the intermediate position when the rocker arm moves from the first circumferential position or the second circumferential position toward the intermediate position. Therefore, the rocker arm is limited through the position, and deflection of the rocker arm caused by the fact that the utilization force directly acts on the rocker arm is avoided.

In some embodiments, the retaining mechanism comprises a first retaining device and a second retaining device symmetrically arranged on both sides of the intermediate position of the rocker arm, wherein the first retaining device and the second retaining device are configured to: the torque that can be applied to the rocker arm is maximum when the rocker arm is near the neutral position; and torque that can be applied to the rocker arm is minimal when the rocker arm is in the vicinity of the first circumferential position and the second circumferential position. Thus, the movement resistance when the rocker arm is switched to the closing position can be reduced while ensuring that the rocker arm is held at the intermediate position.

In some embodiments, the first and second retaining devices may each include a torsion spring including a fixed end and a movable end including an operating arm configured to be contactable with the rocker arm.

In some embodiments, the operating arm is rotatable in response to rotation of the rocker arm and is configured to: the force between the operating arm and the rocker arm being longest with respect to the moment arm of the center of rotation of the rocker arm when the rocker arm is in the intermediate position; the force between the operating arm and the rocker arm passes through the center of rotation of the rocker arm when the rocker arm is in the first circumferential position or the second circumferential position.

In some embodiments, the status indication device may further comprise a guide groove for guiding the rotation of the operating arm, the operating arm being held in the guide groove all the time during rotation of the rocker arm in the first circumferential position and the second circumferential position.

In some embodiments, the rocker arm may include a first male portion on one side of a center of rotation of the rocker arm and a second male portion on an opposite side, the rocker arm configured to trigger a respective microswitch via the first male portion and apply a force to a retention mechanism via the second male portion.

In some embodiments, the second male portion may be a greater distance from the center of rotation than the first male portion.

According to a second aspect of the present disclosure, a dual power transfer switch is provided. The dual power transfer switch includes: the movable contact main shaft is configured to drive the movable contact so that the dual-power transfer switch can be stopped at a first power switching-on position, a second power switching-on position and a dual-power switching-off position; and a status indicating device according to the first aspect.

Drawings

The above, as well as additional purposes, features, and advantages of embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown by way of example, and not by way of limitation.

Fig. 1 shows a partial schematic diagram of a dual power transfer switch according to an embodiment of the present disclosure.

Fig. 2 illustrates a schematic perspective view of a status indication device according to an embodiment of the present disclosure.

Fig. 3 illustrates a plan view of a status indicating device in which a rocker arm presses a second micro switch and is separated from a first micro switch according to an embodiment of the present disclosure.

Fig. 4 illustrates a plan view of a status indicating device in which a rocker arm simultaneously presses a first micro switch and a second micro switch according to an embodiment of the present disclosure.

Fig. 5-7 illustrate interaction diagrams of a rocker arm and a retaining mechanism at different positions according to an embodiment of the present disclosure.

Like or corresponding reference characters indicate like or corresponding parts throughout the several views.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "upper," "lower," "front," "rear," and the like, as used herein, refer to a place or position relationship based on the orientation or position relationship shown in the drawings, and are merely for convenience in describing the principles of the present disclosure, and do not refer to or imply that the elements referred to must have a particular orientation, be configured or operated in a particular orientation, and thus should not be construed as limiting the present disclosure.

Fig. 1 shows a partial schematic diagram of a dual power transfer switch 200 according to an embodiment of the present disclosure. As shown in fig. 1, the dual power transfer switch 200 includes a movable contact 210, a first power contact 220, and a second power contact 230. The moving contact 210 is mounted to a moving contact main shaft 240. The moving contact 210 is connected to a load 250. The moving contact main shaft 240 rotates under the action of the actuating assembly to drive the moving contact 210 to rotate, so as to selectively contact with the first power contact 220 or the second power contact 230. The first power contact 220 may be fixedly disposed in the dual power conversion switch 200 and may be connected with a first power source as a main power source. The second power contact 230 may be fixedly disposed in the dual power transfer switch 200 and may be connected to a second power source as a standby power source.

In the state where the dual power conversion switch 200 is in different positions, the moving contact is in different rotational positions. Thus, an indication of the status of the dual power transfer switch 200 may be provided by the position of the moving contact 210 and/or the moving contact spindle 240. The dual power transfer switch 200 includes three position states, namely a first power on position, a second power on position, and a dual power off position. At the first power switch-on position, the movable contact 210 is switched on with the first power contact 220 and switched off with the second power contact 230 to supply power to the load via the first power supply. At the second power switch-on position, the moving contact 210 is switched off from the first power contact 220 and switched on with the second power contact 230 to supply power to the load via the second power supply. In the dual power off position, the moving contact 210 is off both the first power contact 220 and the second power contact 230.

In some embodiments, as shown in fig. 1, the moving contact 210 is rigidly mounted to the moving contact spindle 240 and is directly driven via the moving contact spindle 240. In this case, the position of the moving contact main shaft 240 corresponds exactly to the position of the moving contact 210. It should be appreciated that this is merely exemplary, and that in other embodiments, the moving contact 210 may be mounted to the moving contact spindle 240 via a linkage or other intermediate member, and driven indirectly via the moving contact spindle 240, in which case the position of the moving contact spindle 240 also corresponds to the position of the moving contact 210.

The moving contact main shaft 240 of the dual power transfer switch 200 is driven via an actuation assembly. At the dual power on/off position of the moving contact 210, the position of the moving contact main shaft 240 is not stable but varies within a certain range, which adversely affects the performance of the dual power transfer switch 200.

In one aspect, when the moving contact of the breaking unit of the dual power transfer switch 200 is in the dual power switching position, the moving contact 210, the first power contact 220 (i.e. the first power inlet terminal), and the second power contact 230 (i.e. the second power inlet terminal) connected to the load need to have an isolation function. For this reason, the first power supply inlet terminal, the second power supply inlet terminal, and the moving contact 210 ensure a sufficient insulation distance from each other. If the position of the moving contact 210 is biased to either side of the first and second power contacts 220 and 230, the side insulation distance will be reduced, resulting in a safety risk.

In another aspect, if the position of the moving contact 210 is biased to either side of the first and second power contacts 220, 230, this will have an effect on the indication of the position of the moving contact 210. In particular, in the case where the status indication device is triggered by a micro switch, the position of the movable contact (and thus the position of the movable contact main shaft) is biased to either one of the first power contact 220 and the second power contact 230, the risk of the driving member in linkage with the movable contact main shaft falsely triggering the micro switch increases. This may cause a false indication of the contact state position, which would pose a safety risk.

In view of this, according to the embodiments of the present disclosure, there is provided a status indicating device for a dual power transfer switch capable of preventing a positional deviation of a moving contact and capable of providing a more accurate contact position indicating function. A status indicating device according to an embodiment of the present disclosure is described in detail below with reference to the accompanying drawings.

Fig. 2-4 illustrate schematic diagrams of status indication devices according to embodiments of the present disclosure. As shown in fig. 2-4, the status indication device 100 includes a rocker arm 110, a first micro switch 120, and a second micro switch 130. The rocker arm 110 is rigidly connected to the moving contact main shaft 240 of the dual power transfer switch. Due to the rigid connection between the rocker arm 110 and the moving contact main shaft 240, the movement of the two is synchronized, and the first micro switch 120 and the second micro switch 130 can be selectively triggered by the rocker arm 110 to provide a status indication.

The first micro-switch 120 is disposed at a first circumferential position around the rocker arm 110. The first micro-switch 120 may be pressed at the first circumferential position when the rocker arm 110 rotates to the first circumferential position. In the event that the first microswitch 120 is depressed, an electrical signal may be sent indicating that the first microswitch 120 is depressed, which may be used to provide a status indication. Similarly, the second micro-switch 130 is disposed at a second circumferential position different from the first circumferential position around the rocker arm 110. The second micro-switch 120 may be pressed at a second circumferential position when the rocker arm 110 rotates to the second circumferential position. In the event that the second microswitch 120 is depressed, an electrical signal may be sent indicating that the first microswitch 120 is depressed, which may be used to provide a status indication.

In the illustrated embodiment, the first and second micro-switches 120, 120 may be symmetrically disposed on either side of the rocker arm 110, such as when the rocker arm 110 is in an intermediate position between the first and second micro-switches 120, the dual power transfer switch is in a dual power on position, and the first and second micro-switches 120, 120 may be triggered to provide an on indication when the rocker arm 110 is rotated clockwise or counter-clockwise, such as 45 °. It should be understood that 45 is only illustrative and that other angle values are possible.

The status indication device 100 further comprises a holding mechanism 160. The retaining mechanism 160 is configured to retain the rocker arm 110 in an intermediate position between the first and second circumferential positions. The neutral position corresponds to the dual power off position of the dual power transfer switch 200. When the rocker arm 110 rotates to the neutral position, the rocker arm 110 may simultaneously press the first micro switch 120 and the second micro switch 130, or simultaneously disengage from the first micro switch 120 and the second micro switch 130. Thus, the status indication regarding the dual power on-off position may be provided by the first micro switch 120 and the second micro switch 130 being pressed simultaneously or not being pressed simultaneously.

In some embodiments, as shown in fig. 2-4, the first and second micro-switches 120, 130 may be mounted on a mount 150 and secured to a securing component on the dual power transfer switch 200 via the mount 150, such as a housing of the dual power switch 200 or an add-on board that can be secured to the housing. As an example, in the embodiment of fig. 2-4, the dual power switch 200 may include a mounting plate 140 for carrying the status indication device 100.

In some embodiments, the signals output by the first and second micro-switches 120, 130 may be processed in a variety of ways to indicate the position of the moving contact. As shown in fig. 3, when the rocker arm 110 rotates to the neutral position, the first micro switch 120 and the second micro switch 130 are simultaneously pressed. Thereby, the first micro switch 120 and the second micro switch 130 simultaneously output the electrical signals. As shown in fig. 4, the rocker arm 110 is out of contact with the first micro-switch 120 at the second circumferential position and presses the second micro-switch 130 into contact at the second circumferential position. Thus, the second micro switch 130 outputs an electrical signal, while the first micro switch 120 does not output an electrical signal. Similarly, the rocker arm 110 presses the first micro-switch 120 at a first circumferential position and disengages from the second micro-switch 130 at a second circumferential position (not shown). Thus, the second micro switch 130 does not output an electrical signal, and the first micro switch 120 outputs an electrical signal.

In some embodiments, the position of the movable contact may be indicated by processing the output signal of the micro switch. In some embodiments, the status indication device 100 may include a status transition device such as a processor. The state transition device may be configured to: providing an indication that the dual power transfer switch 200 is in the dual power off position in the event that the first and second micro switches 120 and 130 are simultaneously pressed; providing an indication that the dual power switch 200 is in the second power on position in the event that the first microswitch 120 is depressed and the second microswitch 130 is not depressed; in the case where the first micro switch 120 is not pressed and the second micro switch 130 is pressed, an indication is provided that the dual power switch 200 is in the first power on position. In this case, the intermediate position corresponds to a dual power supply opening position, the second circumferential position corresponds to a first power supply closing position, and the first circumferential position corresponds to a second power supply closing position. With this arrangement, the safety of the system can be improved. This is because if the micro switch is triggered at the closing position, when the switch button or the internal part of the micro switch is damaged, the micro switch is erroneously indicated as a switching-off signal, which may create a safety hazard. According to the present disclosure, the micro switch is triggered at the opening position; even when the switch button or the internal parts of the micro switch are damaged, the switch-on signal can not be indicated by mistake, and the safety is improved.

In other embodiments, the rocker arm 110 is out of contact with both the first and second micro-switches 120, 130 when the rocker arm 110 is rotated to the neutral position. When the rocker arm 110 rotates to the first power-on position, the rocker arm presses the first micro-switch 120 at the first circumferential position and disengages from the second micro-switch 130 at the second circumferential position. This may be achieved, for example, by providing a protrusion at an appropriate location of the rocker arm 110, and/or alternatively by changing the shape of the resilient dials of the first and second micro switches 120, 130. Similarly, when the rocker arm 110 rotates to the second power-on position, the rocker arm 110 is out of contact with the first micro-switch 120 at the first circumferential position and presses the second micro-switch 130 at the second circumferential position. Since the microswitch is triggered in the closed position, the trigger signal of the microswitch can be used directly to indicate the position of the contact. With this arrangement, the configuration of the system can be simplified.

In some embodiments, as shown in fig. 2-4, the first and second micro-switches 120, 130 each include a lever contact arm 122, 132, and the rocker arm 110 is configured to press the lever contact arms 122, 132 to trigger a respective micro-switch action. The lever contact arms 122, 132 may be in the form of resilient tabs (i.e., dials). The micro switch with the structure is provided with the poking piece, so that the rocker arm is prevented from directly striking the body of the micro switch to trigger, and the micro switch is well adapted even if the impact capacity of the rocker arm is large.

In some embodiments, as shown in fig. 2-4, the lever contact arms 122, 132 may include a lever body and a contact protruding from the lever body toward a center of rotation of the rocker arm 110, the rocker arm 110 configured to press the contact to trigger a corresponding micro-switch action. By this shape, it is ensured that the rocker arm 110 can always reliably press the lever contact arms 122, 132 when the rocker arm 110 moves to the predetermined position. In some embodiments, as shown in fig. 2-4, the contact portion includes an arcuate protrusion. It will be appreciated that this is merely exemplary and that the contact portions may be formed in other suitable convex shapes, such as cylinders, circular arc segments, polygonal protrusions with smooth transitions, etc.

As shown in fig. 3, the first micro-switch 120 and the second micro-switch 130 are symmetrically placed in the mounting seat 150 at equal distances around the rotation center of the rocker arm 110. The microswitch mount 150 is mounted on the mounting plate 140 made of metal, for example. The micro switch is provided with a lever contact arm made of metal, for example. The lever body of the lever contact arm may be linear, and the contact portion of the lever contact arm may include a shape of a protrusion. The rocker arm 110 may include a first male portion 112 located on one side of the center of rotation of the rocker arm 110.

When the movable contact is at the dual power on/off position, as shown in fig. 3, a small gap d1 is maintained between the first convex portion 112 of the rocker arm 110 and the main bodies of the first and second micro switches 120 and 130, and the first convex portion 112 of the rocker arm 110 simultaneously presses the elastic pieces of the first and second micro switches 120 and 130, so that the first and second micro switches 120 and 130 are triggered.

As shown in fig. 4, when the moving contact is at the first power on position, the rocker arm 110 is separated from the first micro switch 120 and maintains a large gap d2 with the main body of the first micro switch 120, and the first micro switch 120 is in a released state; at the same time, the rocker arm 110 presses the elastic piece of the second micro switch 130 to trigger the second micro switch 130. Compared with the moving contact in the dual power switch-off position, the distance d1 between the rocker arm 110 and the main body of the second micro switch 130 is kept unchanged, and the second micro switch 130 is kept in a pressed state, so that the second micro switch 130 outputs a trigger signal.

Similarly, when the movable contact is in the second power on position (not shown in the drawings), the rocker arm 110 is separated from the second micro switch 130 and maintains a large gap with the main body of the second micro switch 130, and the second micro switch 130 is in a released state; at the same time, the rocker arm 110 presses the elastic piece of the first micro switch 120 to trigger the first micro switch 120. Compared with the moving contact in the dual-power-supply switching-off position, the distance d1 between the rocker arm 110 and the main body of the first micro switch 120 is kept unchanged, and the first micro switch 120 is kept in a pressed state, so that the first micro switch 120 continuously outputs a trigger signal.

In some embodiments, the retention mechanism 160 employs a position constraint to ensure that the rocker arm 110 remains in a relatively fixed position at the neutral position. As shown in fig. 2-4, when the movable contact is in the double-split position, the holding mechanism 160 (e.g., the operating arm of the torsion spring) has a certain clearance with the contact surface of the rocker arm, which allows for a small swing. When the rocker arm contacts any working arm, such as a torsion spring, the moment generated by the spring can restore the rocker arm to the neutral position and remain between the two torsion spring working arms.

The rocker arm may include a second male portion 114, and the rocker arm 110 is configured to apply a force to the retention mechanism 160 via the second male portion 114. In some embodiments, the second male portion 114 is located on an opposite side of the first male portion 112 relative to the center of rotation of the rocker arm 110. In some embodiments, the second male portion 114 is a greater distance from the center of rotation than the first male portion 112. In this case, the arm of the holding mechanism against the rocker arm force can be increased so that the desired torque is achieved with as little force as possible.

As shown in fig. 3, a predetermined clearance is maintained with the rocker arm 110 when the rocker arm 110 is in the neutral position. Thus, the rocker arm may allow for less rocking. As the rocker arm 110 moves from the neutral position toward the first circumferential position or the second circumferential position, a torque is applied to the rocker arm 110 that resists movement of the rocker arm 110 away from the neutral position.

In some embodiments, the retaining mechanism 160 includes a first retaining device and a second retaining device symmetrically disposed on either side of the neutral position of the rocker arm 110. When the rocker arm contacts any of the first and second retaining means, the moment generated by the retaining mechanism 160 can return the rocker arm to the neutral position and remain between the first and second retaining means. If there is no gap between the holding mechanism 160 and the rocker arm, and the first holding device and the second holding device press the rocker arm simultaneously, the rocker arm tends to be biased to one side if the torque values of the first holding device and the second holding device are not uniform, thereby causing a safety hazard.

In some embodiments, the first and second retaining devices apply varying torque values to the rocker arm. The first and second retaining devices exert a maximum torque on the rocker arm 110 when the rocker arm 110 is near the neutral position; and the torque applied to the rocker arm 110 is minimal when the rocker arm 110 is near the first and second circumferential positions, e.g., the torque may be zero.

In some embodiments, as shown in fig. 2-4, the first and second retaining means comprise torsion springs 163. The torsion spring 163 includes a fixed end 166 and a movable end 164, the movable end 164 including an operating arm configured to be capable of contacting the swing arm 110. The fixed end 166 may comprise a fixed arm. The spring body between the fixed arm and the operating arm may be mounted to a fixed shaft 162, which may be mounted to the mounting plate 140.

In some embodiments, as shown in fig. 2-4, a fixed end 166 may be provided in the recess 142 of the mounting plate 140 to secure the fixed arm of the torsion spring 163. A guide groove 167 for guiding rotation of the operation arm may also be arranged at an appropriate position of the mounting plate 140. The guide slot 167 may be sized such that the operating arm is always retained in the guide slot 167 during rotation of the rocker arm 110 in the first and second circumferential positions to prevent the operating arm from falling out. In some embodiments, the guide groove 167 may be formed in the form of a U-shaped groove. It should be understood that this is merely exemplary, and that the guide groove 167 may be formed in other shapes such as an elongated groove, an elliptical groove, and the like.

When the dual power switch is in the dual power on position, once the rocker arm 110 is desired to be disengaged from the neutral position, the rocker arm 110 will act on the spring arm and the operating arm will rotate about the stationary shaft 162 to compress the spring body. The ability of the spring body to store will prevent the rocker arm 110 from moving away from the neutral position. When the dual-power transfer switch is switched on, under the action of the actuating assembly, the rocker arm 110 overcomes the acting force of the spring body and moves to the first power switch-on position or the second power switch-on position. Similarly, when the dual-power transfer switch is moved from the closed position to the dual-power-on position, the torsion spring may provide auxiliary assistance to accelerate the rocker arm 110 toward the dual-power-on position in addition to the action of the actuation assembly.

In some embodiments, the torque applied to the rocker arm 110 by the first and second retaining devices varies. In the illustrated embodiment, the movable ends 164 of the torsion springs 163 of the first and second retaining devices are arranged in a flared configuration. This arrangement facilitates adjustment of the force exerted by the torsion spring on the rocker arm 110.

Fig. 5-7 illustrate interaction diagrams of a rocker arm and a retaining mechanism at different positions according to an embodiment of the present disclosure. As shown in fig. 5, when the rocker arm 110 is in the neutral position (the movable contact is in the double-power-supply-split position), the force F between the operating arm of the holding device and the rocker arm 110 is longest with respect to the arm L of the rotation center of the rocker arm 110. At this time, the torque of the torsion spring received by the rocker arm is maximum, that is, the holding force is also maximum. As shown in fig. 6, in the process of closing the moving contact, the acting force F of the torsion spring on the rocker arm and the force arm L between the rotating centers of the rocker arm are gradually reduced, so that the resistance moment born by the moving contact in the process of closing the moving contact is reduced, and the moving contact is facilitated to be closed. As shown in fig. 7, when the rocker arm 110 is in the first circumferential position or the second circumferential position (i.e., the moving contact is in the fully closed position), the acting force F of the torsion spring on the rocker arm passes through the rocker arm rotation center, the moment arm L is approximately 0, and the torque applied to the rocker arm is minimal.

Moreover, although operations are depicted in a particular order, this should be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (15)

1. A status indication device (100) for a dual power transfer switch (200), comprising:

a rocker arm (110) rigidly connected to a moving contact main shaft (240) of the dual power transfer switch and configured to rotate between a first power on position and a second power on position;

a first microswitch (120) arranged in a first circumferential position around the rocker arm (110);

a second microswitch (130) arranged at a second circumferential position around the rocker arm (110) different from the first circumferential position; and

a holding mechanism (160) configured to hold the rocker arm (110) in an intermediate position between the first circumferential position and the second circumferential position, the intermediate position corresponding to a dual-power-supply-off position of the dual-power transfer switch (200);

wherein the rocker arm (110) is configured to: when rotating to one of the first power-on position and the second power-on position, the rocker arm (110) triggers the first micro switch (120) at the first circumferential position; upon rotation to the other of the first power-on position and the second power-on position, the rocker arm (110) triggers the second microswitch (130) at the second circumferential position; and when rotated to the intermediate position, the rocker arm (110) simultaneously triggers the first micro switch (120) and the second micro switch (130) or simultaneously disengages from contact with the first micro switch (120) and the second micro switch (130).

2. The status indication device (100) of claim 1, wherein the first micro switch (120) and the second micro switch (130) each comprise a lever contact arm (122, 132), the rocker arm (110) being configured to trigger the lever contact arms (122, 132) to trigger a respective micro switch action.

3. The status indication device (100) of claim 2, wherein the lever contact arm (122, 132) comprises a lever body and a contact portion protruding from the lever body towards a rotation center of the rocker arm (110), the rocker arm (110) being configured to press the contact portion to trigger a respective micro-switch action.

4. A status indicating device (100) according to claim 3 wherein the contact portion comprises an arcuate projection.

5. The status indicating device (100) of claim 1, wherein the rocker arm (110) is configured to:

triggering the first micro switch (120) and the second micro switch (130) simultaneously when rotating to the intermediate position;

when rotated to the first power on position, out of contact with the first microswitch (120) at the first circumferential position and triggering the second microswitch (130) at the second circumferential position;

when rotated to the second power on position, the first micro switch (120) is triggered at the first circumferential position and is out of contact with the second micro switch (130) at the second circumferential position.

6. The status indicating device (100) of claim 5, further comprising a status transition device configured to:

providing an indication that the dual power transfer switch (200) is in a dual power off position in the event that the first microswitch (120) and the second microswitch (130) are triggered simultaneously;

providing an indication that the dual power switch (200) is in the second power on position with the first microswitch (120) triggered and the second microswitch (130) not triggered;

providing an indication that the dual power switch (200) is in the first power on position with the first microswitch (120) not triggered and the second microswitch (130) triggered.

7. The status indicating device (100) of claim 1, wherein the rocker arm (110) is configured to:

when rotated to the neutral position, out of contact with both the first microswitch (120) and the second microswitch (130) to provide an indication that the dual power transfer switch (200) is in a dual power off position;

triggering the first micro-switch (120) at the first circumferential position and out of contact with the second micro-switch (130) at the second circumferential position upon rotation to the first power-on position to provide an indication that the dual-power transfer switch (200) is in the first power-on position;

upon rotation to the second power on position, out of contact with the first microswitch (120) at the first circumferential position and triggering the second microswitch (130) at the second circumferential position to provide an indication that the dual power transfer switch (200) is in the second power on position.

8. The status indicating device (100) of any one of claims 1-7, wherein the retaining mechanism (160) is configured to:

maintaining a clearance with the rocker arm (110) when the rocker arm (110) is in the neutral position;

applying a torque to the rocker arm (110) that prevents movement of the rocker arm (110) away from the intermediate position as the rocker arm (110) moves from the intermediate position toward the first circumferential position or the second circumferential position; and

when the rocker arm (110) moves from the first circumferential position or the second circumferential position toward the intermediate position, a torque that promotes movement of the rocker arm (110) toward the intermediate position is applied to the rocker arm (110).

9. The status indicating device (100) of claim 8, wherein the retaining mechanism (160) comprises a first retaining device and a second retaining device symmetrically disposed on both sides of the intermediate position of the rocker arm (110), wherein the first retaining device and the second retaining device are configured to:

-a torque that can be applied to the rocker arm (110) is maximum when the rocker arm (110) is in the vicinity of the intermediate position; and is also provided with

The torque that can be applied to the rocker arm (110) is minimal when the rocker arm (110) is in the vicinity of the first circumferential position and the second circumferential position.

10. The status indicating device (100) of claim 9, wherein the first and second retaining devices each comprise a torsion spring (163), the torsion spring (163) comprising a fixed end (166) and a movable end (164), the movable end (164) comprising an operating arm configured to be contactable with the rocker arm (110).

11. The status indicating device (100) of claim 10 wherein the operating arm is rotatable in response to rotation of the rocker arm (110) and is configured to:

the force between the operating arm and the rocker arm (110) is longest with respect to the moment arm of the rotation center of the rocker arm (110) when the rocker arm (110) is in the intermediate position;

when the rocker arm (110) is in the first circumferential position or the second circumferential position, a force between the operating arm and the rocker arm (110) passes through a center of rotation of the rocker arm (110).

12. The status indicating device (100) of claim 10 further comprising a guide slot (167) for guiding rotation of the operating arm, the operating arm being held in the guide slot (167) at all times during rotation of the rocker arm (110) in the first and second circumferential positions.

13. The status indicating device (100) according to any one of claims 1-7, 9-12, wherein the rocker arm comprises a first convex portion (112) located on one side of a rotation center of the rocker arm (110) and a second convex portion (114) located on the opposite side, the rocker arm (110) being configured to trigger a respective micro switch via the first convex portion (112) and to apply a force to a holding mechanism (160) via the second convex portion (114).

14. The status indicating device (100) of claim 13 wherein the second male portion (114) is a greater distance from the center of rotation than the first male portion (112).

15. A dual power transfer switch (200), comprising:

a moving contact main shaft (240) configured to drive the moving contact (210) so that the dual power transfer switch (200) can stop at a first power closing position, a second power closing position, and a dual power opening position; and

the status indication device (100) according to any one of claims 1-14.

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