A load switch

Abstract

The present invention discloses a load switch, which includes a box body and a cover body covering the box body. A load on-off mechanism for controlling the on-off of the circuit where the load is located and a push card for controlling the on-off of the load on-off mechanism are disposed inside the box body. The load on-off mechanism includes a moving conductive sheet, a moving sheet assembly, a static conductive sheet, a moving contact riveted or welded to the moving sheet assembly, and a static contact riveted or welded to the static conductive sheet. The moving sheet assembly includes a moving reed and a shunt sheet. The shunt sheet and the moving reed are stacked together. One end of the moving sheet assembly is riveted or welded to one end of the moving conductive sheet. A shunt for detecting the current of the circuit where the load is located is embedded on the moving conductive sheet. The push card can push the moving sheet assembly to move towards or away from the moving conductive sheet so that the moving contact and the static contact are separated or contacted. By using the load switch of the present invention, the shunt can be built into the box body, with small occupied space and convenient installation.

Description

Technical Field

[0001] The present invention relates to a load switch, and in particular to a load switch applied to a smart electric meter and an industrial automation control system. Background Art

[0002] At present, load switches are widely used in smart meters and industrial automatic control systems. However, existing load switches still have many defects. For example, the shunts are set on the outside of the load switches, which causes large space occupation. The circuit board installation is inconvenient due to various wire connections. The load switch itself is large in size, has low voltage resistance, poor impact current resistance, short service life, and high temperature rise, which reduces the safety of the load switch and brings certain safety hazards to customers.

[0003] In view of the above problems existing in the prior art, it is of great significance to provide a new load switch. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a load switch, which can embed a shunt in a box body, occupies a small space and is easy to install.

[0005] To achieve the above object, the load switch of the present invention comprises a box body and a cover body covering the box body, wherein the box body contains a load on-off mechanism for controlling the on-off of the circuit where the load is located and a push card for controlling the on-off of the load on-off mechanism;

[0006] The load on-off mechanism comprises a moving conductive sheet, a moving sheet assembly, a static conductive sheet, a moving contact riveted or welded to the moving sheet assembly, and a static contact riveted or welded to the static conductive sheet; the moving sheet assembly comprises a moving spring sheet and a shunt sheet, the shunt sheet and the moving spring sheet are stacked together, one end of the moving sheet assembly is riveted or welded to one end of the moving conductive sheet; a shunt for detecting the current of the circuit where the load is located is embedded on the moving conductive sheet;

[0007] The push card can push the moving sheet assembly to move toward or away from the moving conductive sheet so that the moving contact and the stationary contact are separated or in contact.

[0008] Preferably, the dynamic conductive sheet comprises a first dynamic conductive sheet portion and a second dynamic conductive sheet portion, one end of the shunt is welded or riveted to the first dynamic conductive sheet portion, and the other end is welded or riveted to the second dynamic conductive sheet portion.

[0009] Preferably, the shunt piece is located between the moving conductive piece and the moving spring piece. The moving spring piece includes a first end and a second end. The first end of the moving spring piece is riveted or welded to the shunt piece. A through hole for the moving contact to pass through is formed in the second end of the moving spring piece. An arc-shaped hole is formed around the through hole in the second end of the moving spring piece. The opening of the arc-shaped hole faces the first end of the moving spring piece. The pushing card can push the second end of the moving spring piece.

[0010] Preferably, at least one opening groove is formed along the length direction of the moving piece assembly. The opening groove divides the moving piece assembly into several groups of moving piece rods. One moving contact is riveted or welded to each moving piece rod.

[0011] Preferably, a wire is welded to the pin of the shunt. A first opening for the wire to extend out is formed in the box body.

[0012] Preferably, a through hole for the pin of the shunt to extend out is formed in the cover body.

[0013] Preferably, a microswitch for detecting the on / off of the load on / off mechanism is also accommodated in the box body. The microswitch is arranged on the side of the pushing card away from the moving conductive piece. When the pushing card pushes the moving piece assembly to move away from the moving conductive piece so that the moving contact and the static contact are in contact, the pushing card touches the microswitch and the microswitch is turned on. When the pushing card pushes the moving piece assembly to move closer to the moving conductive piece so that the moving contact and the static contact are separated, the pushing card leaves the microswitch and the microswitch is turned off.

[0014] Further, a limiting block is arranged on the microswitch. A through hole for the limiting block to pass through may be formed in the microswitch. A protruding part for restricting the front-back movement of the microswitch is arranged on the cover body. A baffle for restricting the up-down movement of the microswitch is arranged in the box body. A limiting groove for restricting the left-right movement of the microswitch is arranged inside the box body. One end of the limiting block abuts against the baffle, and the other end passes through the through hole and is arranged in the limiting groove.

[0015] Preferably, a first groove is formed in the box body at the position below the moving contact, and a second groove is formed in the cover body at the position above the moving contact.

[0016] Preferably, a second opening for the static conductive piece and the moving conductive piece to extend out is formed in the box body. Reinforcing ribs are arranged around the second opening.

[0017] Compared with the prior art, the beneficial effects of the load switch of the present invention are as follows:

[0018] 1. By embedding a shunt for detecting the current in the circuit where the load is located on the moving conductive sheet and placing the shunt inside the box body, the occupied space of electrical components can be saved.

[0019] 2. By setting a microswitch, the on / off state of the load switch can be known in time; further, by setting a limiting block on the microswitch to limit the microswitch, the stability of the detection signal of the circuit where the microswitch is located can be ensured.

[0020] 3. By opening through holes on the cover body for the pins of the shunt, the pins of the coil assembly, and the pins of the microswitch to extend, when the load switch is installed on the circuit board, external wires are not required, thus reducing the overall volume, saving materials, and facilitating installation.

[0021] 4. Using a moving reed with an arc-shaped hole instead of a spring piece can save the production cost of the load switch.

[0022] 5. By setting a first groove and a second groove, the voltage withstand capacity between the moving contact and the static contact can be ensured;

[0023] 6. By setting a third groove, the voltage withstand capacity between the load on / off mechanism and the magnetic circuit mechanism can be improved;

[0024] 7. By setting a first bending part and a second bending part, the deformation of the inner side of the box body wall can be prevented from tilting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the first embodiment of the load switch of the present invention, where the box body and the cover body are not shown;

[0026] Figure 2 It is an exploded structural diagram of the first embodiment of the load switch of the present invention;

[0027] Figure 3 It is an exploded structural diagram of the load on / off mechanism of the first embodiment of the load switch of the present invention;

[0028] Figure 4 It is a connection structural diagram of the load on / off mechanism and the push card of the first embodiment of the load switch of the present invention;

[0029] Figure 5 It is a connection structural diagram of the moving conductive sheet and the shunt of the first embodiment of the load switch of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the first embodiment of the load switch of the present invention, which shows the box body;

[0031] Figure 7 ForFigure 6 Partial enlarged view of part A

[0032] Figure 8 is Figure 7 Exploded structural schematic diagram of the micro switch and the limit block

[0033] Figure 9 Cross-sectional view of the first embodiment of the load switch of the present invention, showing the first groove and the second groove

[0034] Figure 10 Another cross-sectional view of the first embodiment of the load switch of the present invention, showing the first bending part and the second bending part

[0035] Figure 11 Connection structural schematic diagram of the load on-off mechanism and the push card of the second embodiment of the load switch of the present invention

[0036] Figure 12 Exploded structural schematic diagram of the load on-off mechanism of the second embodiment of the load switch of the present invention

[0037] Figure 13 Structural schematic diagram of the push card of the second embodiment of the load switch of the present invention

[0038] Figure 14 Structural schematic diagram of the moving piece assembly of the second embodiment of the load switch of the present invention

[0039] Figure 15 Structural schematic diagram of the moving reed of the second embodiment of the load switch of the present invention

[0040] Figure 16 Structural schematic diagram of the third embodiment of the load switch of the present invention, where the box body and the cover body are not shown

[0041] Figure 17 Structural schematic diagram of the third embodiment of the load switch of the present invention, showing the box body and the cover body

[0042] Figure 18 Structural schematic diagram of the fourth embodiment of the load switch of the present invention, where the box body and the cover body are not shown

[0043] Figure 19 Structural schematic diagram of the fourth embodiment of the load switch of the present invention, showing the box body and the cover body

[0044] Figure 20 Exploded structural schematic diagram of one way of the moving piece assembly of the fourth embodiment of the load switch of the present invention Detailed implementation mode

[0045] Next, in conjunction with the accompanying drawings, the structure and working principle of the present invention will be further described.

[0046] Figures 1 to 10 The structural schematic diagram of each part of the first embodiment of the load switch of the present invention is shown.

[0047] See Figure 1 、 Figure 2 The load switch of the present invention includes a box body 100 and a cover body 200 covering the box body 100. A load on-off mechanism 300 for controlling the on-off of the circuit where the load is located and a push card 400 for controlling the on-off of the load on-off mechanism 300 are disposed in the box body 100.

[0048] See Figure 3 and in conjunction with Figure 1 、 Figure 2 The load on-off mechanism 300 includes a moving conductive sheet 301, a moving sheet assembly, a static conductive sheet 308, a moving contact 306 riveted or welded to the moving sheet assembly, and a static contact 307 riveted or welded to the static conductive sheet 308. Both the moving conductive sheet 301 and the static conductive sheet 308 extend outside the box body 100. Specifically, a second opening 101 for the moving conductive sheet 301 and the static conductive sheet 308 to extend out is provided on the box body 100. In order to strengthen the strength of the second opening 101 and prevent the second opening 101 from deforming towards the inner side of the box body 100, a reinforcing rib 102 can be provided around the second opening 101.

[0049] The moving sheet assembly includes a moving reed 303 and a shunt sheet 304. The shunt sheet 304 and the moving reed 303 are stacked together. The moving reed 303 is located between the shunt sheet 304 and the moving conductive sheet 302. One end of the moving sheet assembly and one end of the moving conductive sheet 301 are riveted or welded. In order to reduce the contact resistance of the load switch, lower the temperature rise, and extend the service life, the moving sheet assembly can adopt a double-rod structure. Specifically, as Figure 3 shown, a strip-shaped groove (not marked in the figure) is provided on the moving sheet assembly along its length direction. The strip-shaped groove divides the moving sheet assembly into an upper moving sheet rod (not marked in the figure) and a lower moving sheet rod (not marked in the figure). A moving contact 306 is riveted or welded to both the upper moving sheet rod and the lower moving sheet rod. A spring piece 305 for the push card 400 to push is riveted or welded to the side of the end of the lower moving sheet rod close to the static conductive sheet 308. The push card 400 can push the moving sheet assembly to move towards or away from the moving conductive sheet 301 so that the moving contact 306 and the static contact 307 are separated or contacted.

[0050] When arcing occurs between one of the moving contacts 306 and its corresponding stationary contact 307, the distance between the two contacts becomes smaller and smaller. However, the change in their distance will not affect the movement of the moving contact 306 on the other moving piece rod, so that the phenomenon that arcing occurs between one of the moving contacts 306 and its corresponding stationary contact 307 while the other moving contact 306 cannot operate normally will not occur, thereby prolonging the service life of the load switch.

[0051] The above-mentioned strip-shaped groove can also adopt opening grooves of other shapes, such as lightning-shaped, V-shaped, W-shaped, etc. The lightning-shaped opening groove in the second embodiment below is one of the shapes. At the same time, the above-mentioned strip-shaped groove can also be set to multiple to divide the moving piece assembly into several groups of moving piece rods. A moving contact is riveted or welded on each moving piece rod, and the elastic piece should be riveted or welded on the moving piece rod at the bottom of several groups of moving piece rods.

[0052] See Figure 4 and combine with Figure 2 , the pushing card 400 has a first protruding portion 401, a second protruding portion 402 and a third protruding portion 403. The elastic piece 305 can be inserted between the first protruding portion 401 and the second protruding portion 402. Among them, the first protruding portion 401 and the second protruding portion 402 extend downward along the width direction of the moving piece assembly, and the third protruding portion 403 extends in the length direction of the moving piece assembly toward the direction close to the moving contact 306. In the initial state, the moving contact 306 on the lower moving piece rod is separated from its corresponding stationary contact 307, and the moving contact 306 on the upper moving piece rod is in contact with its corresponding stationary contact 307, thereby reducing the thrust of the pushing card 400, that is, the upper moving piece rod is closer to the stationary conductive sheet 308 than the lower moving piece rod.

[0053] When the pushing card 400 moves in the direction close to the moving conductive sheet 301, the second protruding portion 402 can push the elastic piece 305 to move away from the stationary conductive sheet 308 to separate the moving contact 306 on the lower moving piece rod from its corresponding stationary contact 307. At the same time, the third protruding portion 403 can push the upper moving piece rod 309 to move away from the stationary conductive sheet 308 to separate the moving contact 306 on the upper moving piece rod from its corresponding stationary contact 307. At this time, the load switch is disconnected; when the pushing card 400 moves in the direction away from the moving conductive sheet 301, the first protruding portion 401 can push the elastic piece 305 to move close to the stationary conductive sheet 308 to make the moving contact 306 on the lower moving piece rod contact its corresponding stationary contact 307, and the upper moving piece rod resets under its own elastic force to make the moving contact 306 on the upper moving piece rod contact its corresponding stationary contact 307. At this time, the load switch is closed.

[0054] Continue to see Figure 4 and combine with Figure 1 , Figure 2, the reciprocating movement of the push card 400 can be driven by the magnetic circuit mechanism 500. The magnetic circuit mechanism 500 includes a coil assembly, two yokes 507 and an armature assembly. The coil assembly includes an iron core (not shown in the figure), a skeleton 502 for fixing the iron core, and a coil 501 wound around the iron core. Jacks 503 for inserting pins 504 are provided at both ends of the skeleton 502; the armature assembly can drive the push card 400 to move towards or away from the moving conductive sheet 301, so that the moving contact 306 and the static contact 307 are separated or contacted. It includes a plastic housing 509. Two armatures 511 and a permanent magnet (not shown in the figure) sandwiched between the two armatures 511 are provided inside the plastic housing 509. A driving handle 508 for driving the reciprocating movement of the push card 400 is provided on the plastic housing 509. Correspondingly, a socket 404 for inserting the driving handle 508 is provided on the push card 400; one ends of the two yokes 507 are respectively fixed to both ends of the skeleton 502, and the other ends are respectively inserted between the two armatures 511 from both sides; a top plate 505 is provided above the armature assembly. Convex shafts 510 are formed on both the upper and lower sides of the plastic housing 509. Correspondingly, concave holes (not marked in the figure) for inserting the convex shafts 510 are provided on both the bottom of the box body 100 and the top plate 505.

[0055] When the pin 504 is connected to a positive DC pulse voltage, the magnetic poles generated after the coil 501 is excited interact with the magnetic poles of the permanent magnet. The same polarities repel each other, and the opposite polarities attract each other, enabling the armature assembly to rotate counterclockwise around the convex shaft 510. Thus, the driving handle 508 on the plastic housing 509 drives the push card 400 to move away from the moving conductive sheet 301, and further enables the moving contact 306 and the static contact 307 to contact, and the load switch closes; when the pin 504 is connected to a negative DC pulse voltage, the armature assembly can rotate clockwise around the convex shaft 510, so that the driving handle 508 on the plastic housing 509 drives the push card 400 to move towards the moving conductive sheet 301, and further enables the moving contact 306 and the static contact 307 to separate, and the load switch opens.

[0056] To save the occupied space of electrical components and enable the electrical components to be quickly and conveniently installed on the circuit board, a shunt 302 for detecting the current in the circuit where the load is located can be embedded on the moving conductive sheet 301. Specifically, as Figure 5 shown, the moving conductive sheet 301 includes a first moving conductive sheet portion 3011 and a second moving conductive sheet portion 3012. One end of the shunt 302 is welded to the first moving conductive sheet portion 3011, and the other end is welded to the second moving conductive sheet portion 3012. Of course, the shunt 302 can also be connected to the first moving conductive sheet portion 3011 and the second moving conductive sheet portion 3012 in other ways, such as by riveting.

[0057] After the load switch is closed, according to the Lorentz force, a repulsive force will be generated between the moving piece assembly and the moving conductive piece 301. The smaller the distance between the two, the greater the repulsive force. This repulsive force will form a contact pressure on the moving contact 306, causing the moving contact 306 to remain in contact with the static contact 307. However, most of the moving conductive pieces 301 of the existing load switches are inclined relative to the moving piece assembly, resulting in a large repulsive force at one end where the moving piece assembly is riveted or welded to the moving conductive piece 301, and a small repulsive force at the other end, thus resulting in a small contact pressure. When the load switch is subjected to a large current impact, it is very easy to push the moving contact 306 open, causing a malfunction. To avoid the occurrence of the above-mentioned malfunction, as Figure 4 shown, the part of the moving conductive piece 301 inlaid with the shunt 302 is parallel or approximately parallel to the moving piece assembly, and there is a gap (not marked in the figure) formed with the moving piece assembly. This structure results in a step with a height difference between the part where the moving conductive piece 301 is riveted or welded to the moving piece assembly and the part of the moving conductive piece 301 inlaid with the shunt 302. The existence of this step can instantaneously reduce the repulsive force between the moving piece assembly and the moving conductive piece 301, thereby reducing the riveting or welding pressure of the part where the moving conductive piece is riveted or welded to the moving piece assembly. On the premise of ensuring that the moving piece assembly does not touch the moving conductive piece 301, the smaller the gap, the better, and the longer the length of the part of the moving conductive piece inlaid with the shunt, the better, so as to increase the contact pressure and improve the impulse current resistance ability of the load switch.

[0058] The pins 309 of the shunt 302 can be directly welded to the shunt 302 or can also be welded to the first moving conductive piece 301. As Figure 5 shown, the pins 309 of the shunt 302 are respectively welded to the first moving conductive piece part 3011 and the second moving conductive piece part 3012. For connecting to external instruments, wires 310 are welded to the pins 309 of the shunt 302, and a first opening 103 for the wires 310 of the shunt 302 to extend out is provided on the box body 100.

[0059] After the load switch is closed, the current density on the existing moving conductive piece 301 of the load switch is large in the middle and small on both sides, resulting in the repulsive force on the upper moving piece rod and the lower moving piece rod being mainly concentrated near the strip-shaped groove, thus causing the repulsive forces received by the upper moving piece rod and the lower moving piece rod to be uneven and not large, further reducing the contact pressure and lowering the impulse current resistance ability of the load switch. To improve the impulse current resistance ability, as Figure 3 、 Figure 5As shown, first strip-shaped holes 3021 and second strip-shaped holes 3013 are respectively formed at positions on the current shunt 302 and the second movable conductive sheet part 3012 opposite to the strip-shaped grooves. The settings of the first strip-shaped holes 3021 and the second strip-shaped holes 3013 enable parts on both sides of the first strip-shaped holes 3021 and the second strip-shaped holes 3013 to respectively correspond to the upper movable piece rod and the lower movable piece rod. The repulsive forces received by the upper movable piece rod and the lower movable piece rod are respectively concentrated at the middle positions of the two. The repulsive force increases, the contact pressure increases accordingly, and the ability of the load switch to withstand impact current is also correspondingly improved. At the same time, the settings of the first strip-shaped holes 3021 and the second strip-shaped holes 3013 can also increase the cross-sectional area, increase the heat dissipation amount, reduce potential safety hazards, and extend the service life of the load switch.

[0060] See Figure 6 and in combination with Figure 1 、 Figure 2 In order to timely know the on-off state of the load switch, a micro switch 600 for detecting the on-off of the load on-off mechanism 300 is also accommodated in the box body 100. The micro switch 600 is arranged on the side of the push card 400 away from the movable conductive sheet 301. When the push card 400 pushes the movable piece assembly to move away from the movable conductive sheet 301 so that the movable contact 306 and the static contact 307 are in contact, the push card 400 touches the micro switch 600, and the micro switch 600 is turned on; when the push card 400 pushes the movable piece assembly to move closer to the movable conductive sheet 301 so that the movable contact 306 and the static contact 307 are separated, the push card 400 leaves the micro switch 600, and the micro switch 600 is turned off. The lead 601 of the micro switch 600 can be connected to an external circuit through a wire 602. A third opening 104 for the wire 602 to extend out is formed on the box body 100.

[0061] See Figure 7 、 Figure 8 and in combination with Figure 2 、 Figure 6 In order to ensure the stability of the detection signal of the circuit where the micro switch 600 is located, a limit block 603 can be arranged on the micro switch 600 to ensure that the position of the micro switch 600 does not change. Specifically, a through hole 604 for the limit block 603 to pass through can be arranged on the micro switch 600. A fourth protrusion 201 for restricting the front-back movement of the micro switch 600 is arranged on the cover body 200. A baffle 105 for restricting the up-down movement of the micro switch 600 is arranged in the box body 100. A limit groove 106 for restricting the left-right movement of the micro switch 600 is arranged on the inner wall of the box body 100. One end of the limit block 603 abuts against the baffle 105, and the other end passes through the through hole 604 and is inserted into the limit groove 106. Among them, "front-back", "up-down", and "left-right" are consistent with the front-back, up-down, and left-right directions of the attached Figure 6 itself, but do not limit the structure of the present invention.

[0062] When arcing occurs between the moving contact 306 and the stationary contact 307, the silver attached to the contact surface vaporizes, and silver powder is dispersed on the inner wall of the box body 100. In order to reduce the volume, the distance between the moving contact 306 of the existing load switch and the inner wall of the box body 100 is very small. When arcing occurs, the creepage distance between the moving contact 306 and the stationary contact 307 becomes smaller, resulting in a smaller withstand voltage capacity and affecting the service life of the load switch. Therefore, while ensuring that the volume is small enough, in order to ensure the withstand voltage capacity and prevent the creepage distance between the moving contact 306 and the stationary contact 307 from becoming smaller, as Figure 9 shown, a first groove 107 can be formed at a position of the box body 100 below the moving contact 306, and a second groove 202 can be formed at a position of the cover body 200 above the moving contact 306. The spans of the first groove 107 and the second groove 202 cover the moving range of the moving contact 306 to ensure a certain creepage distance.

[0063] Similarly, as Figure 1 shown, in order to improve the withstand voltage capacity between the load on-off mechanism 300 and the magnetic circuit mechanism 500, third grooves 506 are formed at both ends of the top plate 505 to increase the creepage distance between the load on-off mechanism 300 and the magnetic circuit mechanism 500 and improve the withstand voltage capacity.

[0064] Since the wall surface of the box body 100 is very thin, when heated, the wall surface of the box body 100 is prone to tilt and deform inward. For example, after the wall surface of the box body 100 near the push card 400 is deformed, it is likely to block the movement of the push card 400, affecting the closing of the load switch. Therefore, in order to prevent the wall surface of the box body 100 from deforming, as Figure 10 shown, a first bent portion 100a can be formed at the opening of the box body 100, and a second bent portion 200a that can be inserted into the inner side of the first bent portion 100a is formed on the lower side of the cover body 200. The second bent portion 200a can prevent the wall surface of the box body 100 from tilting and deforming inward.

[0065] Figures 11 to 15 The structural schematic diagrams of the various parts of the second embodiment of the load switch according to the present invention are shown.

[0066] The difference between the load switch of this embodiment and the load switch of the first embodiment lies in: the structure of the load on-off mechanism 300' is different, and it omits the elastic piece 305 in the load on-off mechanism 300 of the first embodiment, saving the production cost of the load switch.

[0067] Specifically, as Figure 12As shown, the shunt piece 304' of the moving piece assembly in this embodiment is located between the moving conductive piece 301' and the moving spring piece 303'. The moving spring piece 303' includes a first end and a second end. The first end of the moving spring piece 303' is riveted to the shunt piece 304'. A through hole 312' for the moving contact 306' to pass through is provided at the second end of the moving spring piece 303'. An arc-shaped hole 313' is provided around the through hole 312' at the second end of the moving spring piece 303'. The opening of the arc-shaped hole 313' faces the first end of the moving spring piece 303'. By providing the arc-shaped hole 313', a relatively large elastic deformation of the second end of the moving spring piece 303' can be achieved to replace the elastic piece 305 in the first embodiment. Preferably, the moving spring piece 303' is made of an elastic conductive material. As Figure 15 shown, the shape of the above-mentioned arc-shaped hole 313' is generally U-shaped, and its open end is located on the side of the center of the through hole 312' close to the first end of the moving spring piece 303' to ensure the elastic deformation amount of the second end of the moving spring piece 303'. Of course, the above-mentioned arc-shaped hole 313' can also adopt other shaped holes to increase the elastic deformation amount of the moving spring piece 303'.

[0068] Similarly, in order to reduce the contact resistance of the load switch, lower the temperature rise, and extend the service life, the moving piece assembly can adopt a double-rod structure. Specifically, as Figure 14 shown, an opening groove 314' is provided along the length direction of the moving piece assembly. The opening groove 314' divides the moving piece assembly into an upper moving piece rod (not marked in the figure) and a lower moving piece rod (not marked in the figure). A moving contact 306' is riveted on both the upper moving piece rod and the lower moving piece rod. The opening groove 314' divides the moving spring piece 303' into an upper moving spring piece 315' and a lower moving spring piece 316'. Among them, the above-mentioned arc-shaped hole 313' is provided on the lower moving spring piece 316'. Among them, the above-mentioned opening groove 314' is in a lightning shape.

[0069] The pushing card 400' can push the second end of the moving spring piece 303'. The structure of the pushing card 400' is substantially the same as the structure of the pushing card 400 in the first embodiment. Specifically, refer to Figure 11 and combine with Figures 12 to 15, the pushing card 400' has a first protruding portion 401', a second protruding portion 402' and a third protruding portion 403'. One end of the lower moving spring piece 316' having an arc-shaped hole 313' can be inserted between the first protruding portion 401' and the second protruding portion 402'. Among them, the first protruding portion 401' and the second protruding portion 402' extend downward along the width direction of the moving piece assembly, and the third protruding portion 403' extends in the length direction of the moving piece assembly towards the moving contact 306'. In the initial state, the moving contact 306' on the lower moving piece rod is separated from its corresponding static contact 307', and the moving contact 306' on the upper moving piece rod is in contact with its corresponding static contact 307', thereby reducing the pushing force of the pushing card 400', that is, the upper moving piece rod is closer to the static conductive sheet 308' relative to the lower moving piece rod.

[0070] When the pushing card 400' moves towards the moving conductive sheet 301', the second protruding portion 402' can push one end of the lower moving spring piece 316' having an arc-shaped hole 313' to move away from the static conductive sheet 308' so that the moving contact 306' on the lower moving piece rod is separated from its corresponding static contact 307'. At the same time, the third protruding portion 403' can push the upper moving piece rod to move away from the static conductive sheet 308' so that the moving contact 306' on the upper moving piece rod is separated from its corresponding static contact 307'. At this time, the load switch is disconnected; when the pushing card 400' moves away from the moving conductive sheet 301', the first protruding portion 401' can push one end of the lower moving spring piece 316' having an arc-shaped hole 313' to move towards the static conductive sheet 308' so that the moving contact 306' on the lower moving piece rod is in contact with its corresponding static contact 307'. The upper moving piece rod resets under its own elastic force so that the moving contact 306' on the upper moving piece rod is in contact with its corresponding static contact 307'. At this time, the load switch is closed.

[0071] To prevent one end of the lower moving spring piece 316' having an arc-shaped hole 313' from detaching from the pushing card due to the movement of the pushing card 400', a third bending portion 311' can be provided at one end of the lower moving spring piece 316' having an arc-shaped hole 313'. The third bending portion 311' can be hooked on the first protruding portion 401' or the second protruding portion 402' of the pushing card 400', thereby restricting the movement of the pushing card 400' along the length direction of the moving piece assembly.

[0072] The other structures of this load switch are the same as those of the load switch in the first embodiment and will not be described in detail here.

[0073] Figure 16 , Figure 17 Fig. shows a schematic structural diagram of the third embodiment of the load switch of the present invention.

[0074] See Figure 16 ,Figure 17 , the load switch of this embodiment can be used to be mounted on a circuit board. The difference between it and the load switch of the first embodiment is that through holes (not marked in the figure) for the pins 309 of the shunt 302, the pins 504 of the coil assembly, and the pins 601 of the micro switch 600 to extend are provided on the cover 200. With this structure, no external wires are needed, the overall volume is reduced, materials are saved, and the installation is convenient.

[0075] The other structures of this load switch are the same as those of the load switch of the first embodiment, and will not be elaborated here.

[0076] Figure 18 , Figure 19 Fig. shows the structural schematic diagram of the fourth embodiment of the load switch of the present invention.

[0077] Refer to Figure 18 , 19 , the load switch of this embodiment can be used to be mounted on a circuit board. The difference between it and the load switch of the first embodiment is that its moving piece assembly adopts a single-rod structure, that is, no strip-shaped groove is provided along the length direction of the moving piece assembly, and there is only one moving contact 306 and one static contact 307, which is applicable to a load circuit with small current. In order to reduce the volume of this load switch and make its overall structure more compact, this load switch does not set the micro switch 600, and the arrangement direction of the magnetic circuit mechanism 500 is perpendicular to the arrangement direction of the magnetic circuit mechanism 500 of the first embodiment to further reduce the volume of this load switch.

[0078] Similarly, through holes (not marked in the figure) for the pins 309 of the shunt 302 and the pins 504 of the coil assembly to extend are provided on the cover 200 of this embodiment. With this structure, no external wires are needed, the overall volume is reduced, materials are saved, and the installation is convenient.

[0079] Similarly, as a preferred method, as Figure 20 shown, the moving piece assembly in this embodiment can also adopt the form of the moving piece assembly in the second embodiment, that is, the elastic piece is omitted, and arc-shaped holes 313” are provided around the through holes 312” of the moving spring piece 303”, thereby saving production costs.

[0080] The above is only a schematic description of the present invention. Those skilled in the art should know that various improvements can be made to the present invention without departing from the working principle of the present invention, and all of these belong to the protection scope of the present invention.

Claims

1. A load switch, characterized in that, It includes a box body and a cover body covering the box body. A load on-off mechanism for controlling the on-off of the circuit where the load is located and a push card for controlling the on-off of the load on-off mechanism are arranged inside the box body. The load on-off mechanism includes a moving conductive sheet, a moving sheet assembly, a static conductive sheet, a moving contact riveted or welded to the moving sheet assembly, and a static contact riveted or welded to the static conductive sheet. The moving sheet assembly includes a moving spring sheet and a shunt sheet. The shunt sheet and the moving spring sheet are stacked together. One end of the moving sheet assembly and one end of the moving conductive sheet are riveted or welded. A shunt for detecting the current of the circuit where the load is located is inlaid on the moving conductive sheet. The part of the moving conductive sheet where the shunt is inlaid is parallel or approximately parallel to the moving sheet assembly and has a gap with the moving sheet assembly, so that a step with a height difference is formed between the part of the moving conductive sheet riveted or welded to the moving sheet assembly and the part of the moving conductive sheet where the shunt is inlaid. The push card can push the moving sheet assembly to move towards or away from the moving conductive sheet to separate or contact the moving contact and the static contact. The moving conductive sheet includes a first moving conductive sheet part and a second moving conductive sheet part. One end of the shunt is welded or riveted to the first moving conductive sheet part, and the other end is welded or riveted to the second moving conductive sheet part.

2. The load switch according to claim 1, wherein The shunt sheet is located between the moving conductive sheet and the moving spring sheet. The moving spring sheet includes a first end part and a second end part. The first end part of the moving spring sheet is riveted or welded to the shunt sheet. A through hole for the moving contact to pass through is provided at the second end part of the moving spring sheet. An arc-shaped hole is provided around the through hole at the second end part of the moving spring sheet. The opening of the arc-shaped hole faces the first end part of the moving spring sheet. The push card can push the second end part of the moving spring sheet.

3. The load switch according to claim 1, characterized in that, At least one opening groove is provided along the length direction of the moving sheet assembly. The opening groove divides the moving sheet assembly into several groups of moving sheet rods, and one moving contact is riveted or welded to each moving sheet rod.

4. The load switch according to claim 1, characterized in that Wires are welded to the pins of the shunt, and a first opening for the wires to extend out is provided on the box body.

5. The load switch according to claim 1, wherein A through hole for the pins of the shunt to extend out is provided on the cover body.

6. The load switch according to claim 1, wherein A microswitch for detecting the on-off of the load on-off mechanism is also arranged inside the box body. The microswitch is arranged on the side of the push card away from the moving conductive sheet. When the push card pushes the moving sheet assembly to move away from the moving conductive sheet to make the moving contact and the static contact contact, the push card touches the microswitch and the microswitch is turned on. When the push card pushes the moving sheet assembly to move towards the moving conductive sheet to separate the moving contact and the static contact, the push card leaves the microswitch and the microswitch is turned off.

7. The load switch according to claim 6, wherein, A limit block is provided on the microswitch. A perforation for the limit block to pass through is provided on the microswitch. A protruding portion for restricting the forward and backward movement of the microswitch is provided on the cover body. A baffle for restricting the up and down movement of the microswitch is provided inside the box body. A limit groove for restricting the left and right movement of the microswitch is provided inside the box body. One end of the limit block abuts against the baffle, and the other end passes through the perforation and is inserted into the limit groove.

8. The load switch according to claim 1, characterized in that A first groove is formed at a position of the box body below the moving contact, and a second groove is formed at a position of the cover body above the moving contact.

9. The load switch according to claim 1, wherein A second opening for the static conductive sheet and the moving conductive sheet to extend out is formed on the box body, and reinforcing ribs are provided around the second opening.

Images