CN116936279A

CN116936279A - Dual-power change-over switch

Info

Publication number: CN116936279A
Application number: CN202210367308.4A
Authority: CN
Inventors: 王宁; 刘振忠; 周斌; 曾晓菁
Original assignee: Schneider Electric Industries SAS
Current assignee: Schneider Electric Industries SAS
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2023-10-24

Abstract

The invention provides a dual power transfer switch, comprising: a housing; the hand-operated panel comprises a first pushing part and a second pushing part; the input end of the transmission mechanism is connected with the hand-operated panel; the output end of the transmission mechanism is connected with the driving disc so as to drive the movable contact to be electrically connected with the first fixed contact or the second fixed contact, and the driving disc comprises a containing groove; the blocking member includes a first blocking end, a second blocking end, a pivoting end, and a driven end. The pivoting end is pivotally mounted on the housing and the driven end is movably disposed in and is capable of interacting with the receiving slot. When the moving contact and the first fixed contact are welded, the first pushing part of the hand-operated disc can be abutted with the first blocking end, so that the driving disc receives pushing force from the blocking piece. When the moving contact and the second fixed contact are welded, the second pushing part of the manual operation disc can be abutted with the second blocking end, so that the driving disc receives pushing force from the blocking piece.

Description

Dual-power change-over switch

Technical Field

The invention relates to a dual-power transfer switch.

Background

Dual power transfer switches are a common type of electrical device. The device generally comprises a hand-operated disc, a transmission mechanism, a central rotary disc, a main spring mechanism, a driving disc and the like, so that a moving contact and a fixed contact can be normally opened and closed (namely S1 opening and closing and S2 opening and closing aiming at two power supplies). Meanwhile, the dual power transfer switch generally comprises a brake separating indicator which can correctly indicate the position of the moving contact, so that the switch is convenient to maintain and use safely. When the dual-power transfer switch needs manual brake opening, a user rotates the hand-operated disc through the operating rod, and the hand-operated disc drives the transmission mechanism to move, so that the transmission mechanism passes through a brake opening dead point (namely a spring dead point of the main spring mechanism), and then the main spring mechanism releases elastic potential energy to the central turntable, so that the central turntable is further pushed to drive the driving disc and the moving contact to rotate.

Because there is often an arc between the moving and static contacts of the dual power transfer switch, fusion welding may occur between the moving and static contacts, for some switches, it is generally required that the switch still correctly indicates the position of the contact under a condition of 3 times of normal manual operation force.

The prior art mainly adopts the following two methods to achieve the aim: first), increase the part intensity of the whole drive mechanism, make the part on the drive mechanism fail and point out the position of the contact point erroneously even if exert 3 times of manual operation force, this method is suitable for the miniature switch; secondly), a blocking piece which is interacted with the hand-operated disc and the driving disc is added between the hand-operated disc and the driving disc, the pivoting end of the blocking piece is arranged on the shell frame, the blocking piece is provided with a blocking end which is interacted with the hand-operated disc, the direction of acting force on the blocking end passes through the pivoting center of the blocking piece, so that the force from the hand-operated disc is completely exerted on the shell frame through the blocking piece, and the position of the movable and fixed contact can be correctly indicated by the switch on the premise of not enhancing the strength of parts on the whole transmission mechanism. Generally, mechanisms requiring large operating forces will choose the method of providing such a barrier.

However, with the solution in which the blocking element is provided, even if slight fusion welding occurs, the moment acting on the movable contact is still small, due to the fact that the main spring mechanism of the transmission mechanism just passes through the dead point of the brake, and is insufficient to open the slight fusion welding, in which case the entire transmission mechanism is already rendered unable to perform further brake opening due to the presence of the blocking element. Therefore, although this solution can ensure the safety of the various parts of the switch in case of severe fusion welding, it cannot ensure the normal operation of the switch in case of slight fusion welding.

Disclosure of Invention

In view of the above, the present invention provides a dual power transfer switch, comprising: a housing; the hand-operated disc is arranged on the shell frame and comprises a first pushing part and a second pushing part; a transmission mechanism which is arranged on the shell frame and the input end of which is jointed with the hand-operated disc; the driving disc is arranged on the shell frame, the output end of the transmission mechanism is connected with the driving disc so as to drive the movable contact to be electrically connected with the first fixed contact or the second fixed contact, and the driving disc comprises a containing groove; a blocking member comprising a first blocking end, a second blocking end, a pivoting end, and a driven end, wherein the pivoting end is pivotally mounted on the housing, and the driven end is movably disposed in and is capable of interacting with the receiving slot; when the movable contact and the first fixed contact are welded, the first pushing part of the hand-operated disc can be abutted with the first blocking end, so that the blocking piece enables the driving disc to receive pushing force from the blocking piece through interaction between the driven end and the accommodating groove; when the movable contact and the second fixed contact are welded, the second pushing part of the hand-operated disc can be abutted with the second blocking end, so that the blocking piece can enable the driving disc to receive pushing force from the blocking piece through interaction between the driven end and the accommodating groove.

Therefore, the invention provides a mechanism capable of ensuring the correct indication of the contact position even in fusion welding, which can pull the moving and static contacts open when the moving and static contacts are only slightly fused, and can protect components such as a transmission mechanism and the like when the moving and static contacts are severely fused, so that the brake separating indicator can correctly indicate the contact position. In addition, according to the scheme of the invention, one part of the operating force from the hand-operated disc can act in the direction of separating the moving contact from the fixed contact, and the other part of the operating force acts on the shell frame, so that the components of the transmission mechanism are further ensured not to be damaged due to overlarge stress.

Drawings

FIG. 1 is a schematic diagram of the relevant mechanisms and components of a dual power transfer switch according to the present invention;

FIG. 2 is a schematic illustration of a hand-held panel of a dual power transfer switch according to the present invention;

FIG. 3 is a schematic diagram of the front of a drive plate of a dual power transfer switch according to the present invention;

FIG. 4 is a schematic diagram of a blocking member of a dual power transfer switch according to the present invention;

FIG. 5 is a schematic diagram of a dual power transfer switch according to the present invention when S1 is off;

FIG. 6 is a schematic diagram of a dual power transfer switch according to the present invention when S2 switching is performed;

FIG. 7 is a schematic view of the back side of a drive disk of a dual power transfer switch according to the present invention;

FIG. 8 is a schematic diagram of a center dial of a dual power transfer switch according to the present invention;

fig. 9 is a schematic diagram of the gap between related components of the dual power transfer switch according to the present invention when performing S1 switching-off.

Detailed Description

It should be understood that the orientation, direction, etc. mentioned in the specification and drawings are for descriptive convenience and do not constitute a limitation of the invention.

The present invention provides a transfer switch, as shown in fig. 1, which may be implemented, for example, as a dual-power automatic transfer switch and/or a dual-power manual transfer switch.

Referring to fig. 1 to 4, a dual power transfer switch according to the present invention includes a housing 1, a hand-operated panel 2, a breaking unit (not shown), a transmission mechanism 3, a driving panel 4 for driving a moving contact to move, and the like. The housing 1 may, for example, generally include a housing for accommodating and mounting a mechanism and a component or the like described later, an inner side plate thereof, and the like. In addition, the transmission mechanism 3 further comprises a central rotary table 6 which directly acts with the main spring mechanism and drives the driving disc to move, and the dual-power transfer switch further comprises a brake separating indicator 7 and the like for indicating the brake separating and closing state. The hand-operated disc 2, the transmission 3, the driving disc 4, the central turntable 6 and the brake release indicator 7 are all mounted on the housing 1, for example on the same or different side plates of the housing 1.

Further, the hand-held panel 2 includes a first pushing portion 21 and a second pushing portion 22, and the hand-held panel 2 is manually operated by a user, typically via an operation lever (not shown). The transmission 3 has its input end coupled to the hand-held disk 2 and may be, for example, a conventional gear or link transmission, whereby the input end of the transmission (e.g., an input gear or input link coupled to the hand-held disk 2) receives an operating force from the hand-held disk 2 and transmits the force to downstream components. An output end (e.g., an output gear or an output link) of the transmission mechanism 3 is engaged with the driving disk 4 to drive the moving contact to be electrically connected with the first stationary contact or the second stationary contact, and the driving disk 4 further includes a receiving groove 41.

A dual power transfer switch according to the present invention further comprises a blocking member 5, the blocking member 5 comprising a first blocking end 51, a second blocking end 52, a pivoting end 53 and a driven end 54. The pivoting end 53 is pivotally mounted on the housing 1, and the driven end 54 is movably arranged in the receiving groove 41 and is capable of interacting with the receiving groove 41. According to the invention, when the moving contact and the first fixed contact are welded, the first pushing portion 21 of the hand-operated disc 2 can abut against the first blocking end 51, so that the blocking member 5 causes the driving disc 4 to receive the pushing force from the blocking member 5 through the interaction between the driven end 54 and the receiving groove 41, and thus the driving disc 4 has a tendency to move further; when the moving contact and the second fixed contact are welded, the second pushing portion 22 of the hand operating disc 2 can abut against the second blocking end 52, so that the blocking member 5 can make the driving disc 4 receive the pushing force from the blocking member 5 through the interaction between the driven end 54 and the receiving groove 41, and the driving disc 4 has a further movement tendency.

As previously described, the fusion welding between the moving and static contacts may be a slight fusion welding or a severe fusion welding. Taking the case that the moving contact and the first fixed contact are welded together as an example, if the moving contact and the first fixed contact are welded together slightly, under the condition that a large manual operation force (for example, a force which is greater than a normal manual operation force but is 3 times or less than the normal manual operation force) from a user exists on the manual operation panel 2, when the first pushing part 21 of the manual operation panel 2 rotates to be abutted against the first blocking end 51, the blocking piece 5 further pushes the driving panel 4 to rotate, so that the moving contact and the fixed contact which are welded slightly are pulled apart, and the whole dual-power transfer switch can continue to normally operate.

In the case of severe fusion welding, when there is a large manual operation force from the user on the hand-operated panel 2, after the first pushing portion 21 of the hand-operated panel 2 abuts against the first blocking end 51, although the driven end 54 of the blocking member 5 applies a pushing force to the driving panel 4 through the receiving groove 41, the severe fusion welding between the moving and static contacts is not sufficiently pulled apart. The user exerting a large operating force will be able to perceive that the hand-held panel 2 cannot be pushed further, and will be informed that the dual power transfer switch may fail. At the same time, even if the manual operating force of the user is large (for example, 3 times the normal manual operating force), since the force acting on the blocking member 5 by the manual operating plate 2 further acts on the housing 1 and the driving plate 4 by the pivot end 53 and the driven end 54 of the blocking member 5, respectively, it is ensured that the individual components of the double power transfer switch (in particular, the components of the transmission mechanism) are not damaged in the case of such severe fusion welding.

It will be appreciated that the hand-operated disc 2, the blocking member 5 and the driving member 4 also follow a similar interaction when the movable contact is welded to the second stationary contact, and will not be described in detail here. Therefore, whether slight fusion welding or severe fusion welding occurs, the hand-operated panel 2 pushes the blocking member 5 through the pushing portions 21 and 22 thereof, and further, pushes the driving panel 4 through the blocking member 5, so that the driving panel 4 has a movement tendency to separate the moving contact from the corresponding stationary contact. The "movement tendency" herein means that the force of the blocking member 5 against the driving disk 4 may separate the moving and fixed contacts where the welding occurs or may not separate the moving and fixed contacts where the welding occurs.

Therefore, according to the dual-power transfer switch, the moving contact and the fixed contact can be accurately separated when the moving contact and the fixed contact are slightly welded, and the large manual operating force born by the whole transmission mechanism can be reduced when the moving contact and the fixed contact are seriously welded, so that the damage to the transmission mechanism, the driving disc and other parts is avoided.

In addition, it is to be understood that the above-described mechanisms and components may be appropriately arranged and arranged in accordance with the requirements of the operational relationship, the movement relationship, etc. between the assembly space and the components of the double power conversion switch. For example, in the preferred embodiment shown in the drawings, the first pushing portion 21 and the second pushing portion 22 are formed as projections on the axial end face of the hand-held disk 2, and are close to the periphery of the hand-held disk 2. It will be appreciated that the specific shape and position of both the first pushing portion 21 and the second pushing portion 22 may be adjusted and changed depending on the shape and position of the blocking member 5, the driving disk 4, etc., and thus the first pushing portion 21 and the second pushing portion 22 may take a different configuration from the illustrated embodiment without departing from the scope of the present invention as long as they can properly achieve their functions and purposes as described above.

Further preferably, referring to fig. 4, the pivoting end 53 and the driven end 54 of the blocking member 5 may be arranged in a first direction A1, the first blocking end 51 and the second blocking end 52 of the blocking member 5 being arranged in a second direction A2, the first direction A1 being at an angle to the second direction A2. The first direction A1 passes through the pivot centers of the pivot ends 53 and the driven ends 54, and the second direction A2 passes through the middle of the line between the pivot centers of the pivot ends 53 and the driven ends 54. By this arrangement, the force applied by the blocking element 5 and the distribution of the force to the housing 1 and the drive disk 4 can be better optimized. More preferably, the blocking member 5 is formed in a cross shape, the first direction A1 is perpendicular to the second direction A2, and the first blocking end 51 and the second blocking end 52 are axisymmetrically disposed with respect to the first direction A1. It will be appreciated that the blocking member 5 may take on various other shapes and configurations depending on the space in which the dual power transfer switch is assembled, the positional relationship of the various components, etc.

Further preferably, referring to fig. 3, the receiving groove 41 of the drive disk 4 is formed as a V-groove formed by a first groove section 411 and a second groove section 412 (both preferably straight), and the first groove section 411 and the second groove section 412 meet at a bottom end 413 of the V-groove. The bottom end 413 is closer to the pivot center 40 of the drive disk than the ends of the first slot segment 411 and the second slot segment 412, respectively (i.e., the ends opposite the bottom ends of the V-shaped slots). It is further preferred that the first slot segment 411 and the second slot segment 412 are axisymmetrically arranged with respect to a first line L1 between the bottom end 413 and the pivot center 40. By providing V-grooves, the interaction between the follower end 54 of the blocking member 5 and the receiving slot 41 can be optimized during the switching off of S1 and S2 of the double power transfer switch.

It is further preferred that by providing the segmented receiving groove 41, when the moving contact is fusion-welded with the first stationary contact, the first pushing portion 21 can abut against the first blocking end 51 (when the moment acting on the moving contact is small due to the main spring just passing through the brake-separating dead point, and slight fusion welding is not yet performed) when the hand-operated plate 2 moves the transmission mechanism 3 just past the first brake-separating dead point (when S1 is separated), so that the hand-operated plate 2 is pushed further, the driven end 54 applies a pushing force to the first groove segment 411 of the receiving groove 41 so that the driving plate 4 has a movement tendency to separate the moving contact from the first stationary contact, that is, as described above, the blocking member 5 pushed by the hand-operated plate 2 can assist the driving plate 4 to pull the moving contact away from the first stationary contact when fusion-welded slightly, or a force from the hand-operated plate 2 acts on the housing frame and the driving plate 4 via the blocking member 5 when fusion-welded severely.

Referring specifically to fig. 5, the motion situation of the relevant components in the process from switching on of the dual power supply change-over switch from switching on of S1 to switching off of S1 is shown from left to right, state (a) shows that the switch is at the switching-on position of S1, and the hand-operated disc 2 rotates anticlockwise, so that the transmission mechanism 3 reaches the switching-off dead point of S1 shown in state (b). Then, the state (c) indicated by the downward oblique arrow shows the normal opening situation when fusion welding does not occur, that is, the main spring mechanism releases elastic potential energy to enable the central turntable 6 to rotate, the central turntable 6 drives the driving disc 4 to rotate clockwise to the S1 opening position, and the driving disc 4 drives the blocking piece 5 to rotate anticlockwise. In this process, the movement direction of the hand-operated disc 2 is also in the anticlockwise direction for pushing the blocking member 5, so that the hand-operated disc 2 and the blocking member 5 do not interfere with each other, the driving disc 4 is not adversely prevented from realizing normal brake separation, and the brake separation indicator 7 is also in a position correctly showing the brake separation state.

While the state (d) indicated by the obliquely upward arrow shows the case where fusion welding (including slight or severe fusion welding) occurs and the S1 break dead point has just passed, at which time the first pushing portion 21 has been abutted against the first blocking end 51, the hand-operated disc 2 is pushed further, and the driven end 54 applies a pushing force to the first slot segment 411 of the accommodating slot 41: if slight fusion welding occurs, the thrust can still pull the moving and static contacts open to realize normal brake separation, namely, the state (d) can be changed into the state (c); if severe fusion welding occurs, the state (d) is remained, and the opening indicator 7 correctly shows that the moving contact is still connected with the first fixed contact, that is, in the S1 closing position.

It is further preferred that a first component of the force when the first pushing part 21 abuts the first blocking end 51 acts on the housing 1 through the pivoting end 53 of the blocking member 5, and a second component of the force acts as said pushing force on the first slot section 411 of the receiving slot 41 through the driven end 54, whether a slight fusion welding or a severe fusion welding occurs, so that the force from the hand operating disc 2 is distributed via the blocking member 5 to the housing 1 and the driving disc 4, in particular when a severe fusion welding occurs, as described above. And more preferably, the second component of the force is a function of the angle of the first slot segment 411 relative to the first line L1, see fig. 4. By appropriately setting the position and the structure of the pushing parts 21, 22 on the hand-operated disc 2, the blocking member 5, the driving disc 4, the angle etc., the force can be made preferably perpendicular to the first direction A1.

Similarly, by providing the segmented receiving groove 41, when the movable contact and the second stationary contact are fusion-welded, the second pushing portion 22 can abut against the second blocking end 52 (when the moment acting on the movable contact is small due to the main spring just passing through the brake-separating dead center, and slight fusion welding cannot be performed yet) when the hand-operated disc 2 moves the transmission mechanism 3 just past the brake-separating dead center (when S2 is separated), so that the hand-operated disc 2 is pushed further, the driven end 54 applies pushing force to the second groove segment 412 of the receiving groove 41 to cause the driving disc 4 to have a movement tendency to separate the movable contact from the second stationary contact, that is, as described above, the blocking member 5 pushed by the hand-operated disc 2 can assist the driving disc 4 to move to pull the movable contact away from the second stationary contact when the hand-operated disc 2 is slightly fusion-welded, or the force from the hand-operated disc 2 acts on the housing and the driving disc 4 via the blocking member 5 when the hand-operated disc is severely fusion-welded.

Referring specifically to fig. 6, the motion situation of relevant components in the process from switching on of the dual power supply change-over switch from S2 to switching off of S2 is shown from left to right, state (e) shows that the switch is at the switching-on position of S2, and the hand-operated disc 2 rotates clockwise, so that the transmission mechanism 3 reaches the switching-off dead point of S2 shown in state (f). Then, the state (g) indicated by the downward oblique arrow shows the normal opening situation when fusion welding does not occur, that is, the main spring mechanism releases elastic potential energy to enable the central turntable 6 to rotate, the central turntable 6 drives the driving disc 4 to rotate anticlockwise to the S2 opening position, and the driving disc 4 drives the blocking piece 5 to rotate clockwise. In this process, the movement direction of the hand-operated disc 2 is also clockwise to push the blocking member 5, so that the hand-operated disc 2 and the blocking member 5 do not interfere with each other, the driving disc 4 is not adversely prevented from achieving normal opening, and the opening indicator 7 is also in a position to correctly show the opening state.

While the state (h) indicated by the obliquely upward arrow shows the case where the welding (including the slight or severe welding) occurs and the S2 break dead point has just passed, at which time the second pushing portion 22 has been abutted against the second blocking end 52, the hand-operated disc 2 is pushed further, and the driven end 54 applies the pushing force to the first groove section 412 of the accommodation groove 41: if slight fusion welding occurs, the thrust can still pull the moving and static contacts open to realize normal brake separation, namely, the state (h) can be changed into the state (g); if severe fusion welding occurs, the state (g) is remained, and the opening indicator 7 correctly shows that the moving contact is still connected with the first fixed contact, that is, in the S2 closing position.

Similarly, whether a slight fusion weld or a severe fusion weld occurs, a first component of the force of the second pusher 22 when it abuts the second blocking end 52 acts on the housing 1 through the pivoting end 53 of the blocking member, and a second component of the force acts as said pushing force through the driven end 54 on the second groove section 412 of the receiving groove 41, so that the force from the hand-operated disc 2 is dispersed onto the housing 1 and the driving disc 4 through the blocking member 5, in particular when a severe fusion weld occurs, as previously described. And more preferably, the second component of the force is a function of the angle of the second slot segment 412 relative to the first line L1, see fig. 4. By appropriately setting the position and the structure of the pushing parts 21, 22 on the hand-operated disc 2, the blocking member 5, the driving disc 4, the angle etc., the force can be made preferably perpendicular to the first direction A1.

Further preferably, referring to fig. 5, the pivot center of the hand-operated disc 2, the pivot center of the drive disc 4, and the pivot center of the pivot end 53 of the stopper 5 may be disposed on the same straight line L2. Further preferably, when the dual power transfer switch is in the off position, the bottom end 413 of the V-shaped groove is also disposed on the same straight line L2. By the above arrangement, the mounting position and the movement relation of these components can be optimized, thereby improving the assembly and facilitating miniaturization.

Further preferably, the dual power conversion switch further comprises a switching-off indicator 7 mounted on the housing 1, and the driving disc 4 comprises a first arm 43 and a second arm 44 for pushing the switching-off indicator 7, said V-shaped groove being provided on said first arm 43. According to the arrangement, the V-shaped groove can be arranged by utilizing the structure of the existing driving disc, and the scheme of the invention is enhanced in compatibility without more modification.

Further preferably, the invention also proposes to improve the movement relationship of the hand-held disk 2 and the blocking element 5 when no welding is occurring. In particular, referring to fig. 7-8, the transmission 3 further comprises a central turntable 6, which acts directly with the main spring mechanism, mounted on the frame 1 and comprises a projection 60 extending in the radial direction of the central turntable 6, and which is received in a corresponding sector cavity 42 of the drive disk 4. During the switching-on/off operation of the double power transfer switch, the side edges 601, 602 of the projection 60 can push the corresponding side walls 421, 422 of the fan-shaped cavity 42, so as to rotate the driving disc 4 and further move the moving contact. The cam 60 is thus the output 60 of the transmission 3.

Furthermore, the invention proposes to further optimize the arrangement and structure of the hand-operated disc 2, the blocking member 5, the output end 60 of the transmission mechanism 3 and the driving disc 4 such that, when the moving contact is not welded to the first stationary contact and the hand-operated disc 2 moves the transmission mechanism 3 to the first opening dead point (i.e. during the opening operation S1), there is a first abutment angular gap G1 between the first pushing portion 21 of the hand-operated disc 2 and the first blocking end 51, which first abutment angular gap G1 is smaller than the first pushing angular gap G1' between the output end 60 of the transmission mechanism 3 and the corresponding stressed side wall 421 of the driving disc 4, see fig. 9.

Similarly, although not shown, during the S2 opening operation, when the moving contact is not welded to the second stationary contact and the hand-operated disc 2 moves the transmission 3 to the second opening dead point, there is a second abutment angular gap between the second pushing portion 22 and the second blocking end 52, which is smaller than the second pushing angular gap between the output end 60 of the transmission and the corresponding force-receiving side wall 422 of the driving disc.

According to the design of the blocking member in the prior art, an accurate movement relation and an accurate clearance are generally required between the hand operating disc and the blocking member during normal brake opening, so that the blocking member does not obstruct the normal operation of the hand operating disc, the transmission mechanism and the driving disc, the dimensional accuracy requirements on related parts are extremely high, and once interference between the hand operating disc and the blocking member occurs, the reliability of normal brake opening can be influenced. With the above arrangement of the present invention, the hand-operated disc 2 and the blocking member 5 are not normally contacted during normal opening due to the above-mentioned gap and the setting of the relationship therebetween, so that the movement of the transmission mechanism 3 is smoother, and even if the hand-operated disc 2 and the blocking member 5 interfere (particularly when slightly fusion welding occurs), the direction in which the hand-operated disc 2 acts on the blocking member 5 is in the direction of assisting the opening movement of the driving disc 4. Thus, the clearance setting and the requirements for the movement relationship between the components are reduced compared to the prior art, further simplifying the component design and manufacturing costs.

Further preferably, and referring to fig. 2, the first pushing portion 21 and the second pushing portion 22 of the hand-operated disc 2 may be formed as protrusions on the axial end face of the hand-operated disc 2 near the periphery of the hand-operated disc 2, and have a thickness in the pivot axis direction A3 of the hand-operated disc 2. With this arrangement, the first pushing portion 21 and the first blocking end 51 can be brought into surface contact or line contact with each other when they are abutted, and the second pushing portion 22 and the second blocking end 52 can be brought into surface contact or line contact with each other when they are abutted, so that sufficient contact can ensure transmission of force.

Further preferably, and referring to fig. 4, the driven end 54 includes a cylindrical post 541 disposed in the receiving slot 41 so as to ensure smooth movement of the cylindrical post 541 in the receiving slot 41. The cylindrical posts 541 and the inner wall of the receiving groove 41 may also be optimized in terms of materials, coatings, and surface finishing so that the interaction therebetween is smoother.

In summary, the invention provides a mechanism capable of ensuring correct indication of the contact position even in fusion welding, which can pull the moving and static contacts open when the moving and static contacts are only slightly fused, and can protect components such as a transmission mechanism when the moving and static contacts are severely fused, so that the brake separating indicator can correctly indicate the contact position. In addition, according to the scheme of the invention, one part of the operating force from the hand-operated disc can act in the direction of separating the moving contact from the fixed contact, and the other part of the operating force acts on the shell frame, so that the components of the transmission mechanism are further ensured not to be damaged due to overlarge stress.

The exemplary implementation of the solution proposed by the present disclosure has been described in detail hereinabove with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and adaptations can be made to the specific embodiments described above and that various combinations of the technical features, structures proposed by the present disclosure can be made without departing from the scope of the present disclosure, which is defined by the appended claims.

Claims

1. A dual power transfer switch includes

A housing (1);

a hand-operated panel (2) mounted on the housing (1) and including a first pushing portion (21) and a second pushing portion (22);

a transmission mechanism (3) which is mounted on the housing (1) and whose input end is engaged with the hand-operated panel (2);

a driving disk (4) mounted on the housing (1) and an output end of the transmission mechanism (3) is engaged with the driving disk (4) to drive the moving contact to be electrically connected with the first fixed contact or the second fixed contact, and the driving disk (4) includes a receiving groove (41);

a blocking member (5) comprising a first blocking end (51), a second blocking end (52), a pivoting end (53) and a driven end (54), wherein the pivoting end (53) is pivotably mounted on the housing (1), and the driven end (54) is movably arranged in the receiving groove (41) and is capable of interacting with the receiving groove (41);

when the movable contact and the first fixed contact are welded, the first pushing part (21) of the hand-operated disc (2) can be abutted with the first blocking end (51) so that the blocking piece (5) enables the driving disc (4) to receive pushing force from the blocking piece (5) through interaction between the driven end (54) and the accommodating groove (41);

when the movable contact and the second fixed contact are welded, the second pushing part (22) of the hand-operated disc (2) can be abutted with the second blocking end (52) so that the blocking piece (5) enables the driving disc (4) to receive pushing force from the blocking piece (5) through interaction between the driven end (54) and the accommodating groove (41).

2. The dual power transfer switch of claim 1, wherein the pivoting end (53) and the driven end (54) of the blocking member (5) are arranged along a first direction (A1), the first blocking end (51) and the second blocking end (52) of the blocking member (5) are arranged along a second direction (A2), the first direction (A1) is angled to the second direction (A2), and wherein the first direction (A1) passes through the pivoting centers of the pivoting end (53) and the driven end (54), and the second direction (A2) passes through the middle of the line between the pivoting centers of the pivoting end (53) and the driven end (54).

3. The dual power transfer switch according to claim 2, wherein the blocking member (5) is formed in a cross shape, a first direction (A1) is perpendicular to a second direction (A2), and the first blocking end (51) and the second blocking end (52) are axisymmetrically disposed with respect to the first direction (A1).

4. The dual power transfer switch of claim 2, wherein the receiving slot (41) is formed as a V-shaped slot formed by a first slot section (411) and a second slot section (412), and the first slot section (411) and the second slot section (412) meet at a bottom end (413) of the V-shaped slot, wherein the bottom end (413) is closer to the pivot center (40) of the drive plate than the respective ends of the first slot section (411) and the second slot section (412).

5. The dual power transfer switch of claim 4, wherein the first slot section (411) and the second slot section (412) are axisymmetrically disposed with respect to a first line (L1) between the bottom end (413) and the pivot center (40).

6. The double power transfer switch as claimed in claim 4, wherein when the moving contact and the first stationary contact are welded, the first pushing portion (21) can abut against the first blocking end (51) when the hand-operated disc (2) moves the transmission mechanism (3) just past the first opening dead point, so that the hand-operated disc (2) is pushed further, and the driven end (54) applies pushing force to the first groove section (411) of the accommodating groove (41) so that the driving disc (4) has a movement tendency of separating the moving contact from the first stationary contact.

7. A dual power transfer switch according to claim 6, wherein a first component of the force of the first pushing part (21) when in abutment with the first blocking end (51) acts on the housing (1) through the pivoting end (53) of the blocking member (5), and a second component of the force acts as said pushing force on the first slot section (411) of the receiving slot (41) through the driven end (54).

8. The dual power transfer switch of claim 7, wherein the second component of the force is a function of the angle of the first slot segment (411) relative to the first line (L1).

9. The dual power transfer switch of claim 7, wherein the force is perpendicular to the first direction (A1).

10. The double power transfer switch as claimed in claim 4, wherein when the moving contact and the second stationary contact are welded, the second pushing portion (22) can abut against the second blocking end (52) when the hand-operated disc (2) moves the transmission mechanism (3) just past the second breaking dead point, so that the hand-operated disc (2) is pushed further, and the driven end (54) applies pushing force to the second groove section (412) of the accommodating groove (41) so that the driving disc (4) has a movement tendency of separating the moving contact from the second stationary contact.

11. The dual power transfer switch as claimed in claim 10, wherein a first component of the force of the second pushing portion (22) when abutting against the second blocking end (52) acts on the housing frame (1) through the pivoting end (53) of the blocking member, and a second component of the force acts as the pushing force on the second groove section (412) of the receiving groove (41) through the driven end (54).

12. The dual power transfer switch of claim 11, wherein the second component of the force is a function of an angle of a second slot segment (412) relative to the first line (L1).

13. The dual power transfer switch of claim 11, wherein the force is perpendicular to the first direction (A1).

14. The dual power transfer switch as claimed in claim 4, wherein the pivot center of the hand-operated disc (2), the pivot center of the drive disc (4) and the pivot center of the pivot end (53) of the blocking member (5) are arranged on the same straight line (L2).

15. The dual power transfer switch of claim 14, wherein the bottom end (413) of the V-shaped groove is also disposed on the same straight line (L2) when the dual power transfer switch is in the off position.

16. The dual power transfer switch of claim 4, further comprising a break indicator (7) mounted on the housing (1), the drive plate (4) comprising a first arm (43) and a second arm (44) for pushing the break indicator (7), said V-shaped groove being provided on said first arm (43).

17. The double power transfer switch according to any one of claims 1-16, wherein when the moving contact is not welded to the first stationary contact and the hand-operated disc (2) moves the transmission mechanism (3) to the first breaking dead point, a first abutment angle gap (G1) exists between the first pushing part (21) and the first blocking end (51), which first abutment angle gap (G1) is smaller than the first pushing angle gap (G1') between the output end (60) of the transmission mechanism (3) and the corresponding stressed side wall (421) of the drive disc (4).

18. The double power transfer switch according to any one of claims 1-16, wherein when the moving contact is not welded to the second stationary contact and the hand-operated disc (2) moves the transmission mechanism (3) to the second break dead point, there is a second abutment angle gap between the second pushing part (22) and the second blocking end (52), which is smaller than the second pushing angle gap between the output end (60) of the transmission mechanism (3) and the corresponding stressed side wall (422) of the driving disc.

19. The dual power transfer switch as claimed in any one of claims 1 to 16, wherein the first pushing portion (21) and the second pushing portion (22) of the hand-operated disc (2) are formed as projections on an axial end face of the hand-operated disc (2) and close to a periphery of the hand-operated disc (2), and have a thickness in a pivoting axis direction (A3) of the hand-operated disc (2);

wherein the first pushing part (21) and the first blocking end (51) form surface contact or line contact when in abutting connection, and

wherein, when the second pushing part (22) is abutted with the second blocking end (52), surface contact or line contact is formed between the second pushing part and the second blocking end.

20. A dual power transfer switch as claimed in any one of claims 1 to 16 wherein the driven end (54) includes a cylindrical post (541), the cylindrical post (541) being disposed in the receiving slot (41).