A load switch

Abstract

This invention discloses a load switch, including a housing, a stationary contact and a moving contact disposed within the housing; the moving contact includes a contact plate; a support shaft is also provided within the housing, and the contact plate rotates along the support shaft within the housing; a sliding block is also provided within the housing; the sliding block moves upward or downward within the housing, and a transmission rod is provided on one side of the sliding block; by moving the sliding block, the transmission rod causes the contact plate to rotate along the support shaft, completing the contact or separation between the contact plate and the stationary contact. This switch utilizes a crank-slider mechanism to control the opening and closing of the contact plate, resulting in a novel and unique on / off structure for the load switch circuit, and the crank-slider mechanism occupies little space; by increasing the gap between the contact plate and the stationary contact, the safety isolation distance is increased to facilitate the rapid extinguishing of the arc; this structure can provide sufficiently large contact pressure so that the switch can withstand large circuit breaker currents without repelling arcing.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, specifically to a load switch. Background Technology

[0002] Existing load switches, such as the one described in announcement number CN117524799B, use a magnetic latching relay as a power source to complete the circuit switching. After being energized, the moving contact is directly driven to complete the opening and closing action. This method has the following disadvantages: the electrical clearance between the moving and stationary contacts is small. When a large fault current passes through, the arc is not easily extinguished because the safety isolation distance between the contacts is too small. Summary of the Invention

[0003] The purpose of this invention is to provide a load switch to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a load switch, comprising a housing, a stationary contact and a moving contact disposed within the housing; the moving contact includes a contact plate; wherein, a support shaft is further provided within the housing, and the contact plate rotates along the support shaft provided within the housing; a sliding block is further provided within the housing; wherein, the sliding block moves upward or downward within the housing, and a transmission rod is provided on one side of the sliding block; by moving the sliding block, the transmission rod causes the contact plate to rotate along the support shaft, thereby completing the contact or separation between the contact plate and the stationary contact.

[0005] As a preferred technical solution of the present invention: one end of the transmission rod is adapted to be connected to the shaft pin rod provided in the middle of the sliding block through a provided groove, and the other end of the transmission rod is inserted into the insertion hole provided in the contact plate through a provided pin. By moving the sliding block, the transmission rod causes the contact plate to contact or separate from the stationary contact.

[0006] As a preferred technical solution of the present invention: the contact plate is connected to the support shaft through a circular hole, and the transmission rod is sleeved on the support shaft through a pin hole. The movement of the sliding block causes the transmission rod to rotate along the support shaft, and the contact plate rotates along the support shaft to cause the contact plate to contact or separate from the stationary contact.

[0007] As a preferred embodiment of the present invention: an energy storage torsion spring is further provided inside the housing; wherein, one end of the energy storage torsion spring is fixed inside the housing, and the other end of the energy storage torsion spring is fixed to the contact plate.

[0008] As a preferred technical solution of the present invention: it further includes a coil frame, and the sliding block is slidably installed in the coil frame; both ends of the coil frame are provided with electromagnetic coils, and the sliding block is directionally moved in the coil frame through the electromagnetic coils; wherein, the shaft pin passes through the coil frame from the outside to the inside and is connected to the sliding block.

[0009] As a preferred embodiment of the present invention: permanent magnets are provided on both sides of the coil frame, and the permanent magnets are located between the two electromagnetic coils.

[0010] As a preferred technical solution of the present invention: the outer side of the coil frame is further provided with a magnetic yoke, and the side of the magnetic yoke is further provided with a guide groove for guiding the sliding of the shaft pin.

[0011] As a preferred embodiment of the present invention, the moving contact further includes a conductive sheet, and the conductive sheet is connected to the contact plate via a flexible wire.

[0012] As a preferred embodiment of the present invention: the outer surface of the housing is further provided with pins, and the pins are electrically connected to the electromagnetic coil.

[0013] The beneficial effects of the present invention using the above technical solution are as follows: the switch forms a crank-slider mechanism through a contact plate, a sliding block, a transmission rod, and a support shaft, and then uses this crank-slider mechanism to control the opening and closing of the contact plate, so that the switching structure of the load switch circuit is novel and unique, and the crank-slider mechanism occupies little space; in particular, when the sliding block slides downward inside the housing, the transmission rod is used to pry the contact plate and the stationary contact apart. At the same time, as the sliding block moves downward, the gap between the contact plate and the stationary contact can be widened. By widening the gap between the contact plate and the stationary contact, the safety isolation distance is increased, so as to facilitate the rapid extinguishing of the arc. After closing, the transmission rod can always make the contact plate press against the stationary contact to ensure the stability of the circuit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the internal structure of the main body shell of the present invention after it has been opened;

[0016] Figure 3 This is a schematic diagram of the present invention in the open state;

[0017] Figure 4 This is a schematic diagram of the present invention in the closed state;

[0018] Figure 5 This is an exploded view of the structure of the stationary contact, moving contact, and housing of the present invention;

[0019] Figure 6 This is a schematic diagram of the main structure of the moving contact of the present invention;

[0020] Figure 7 An exploded view of the coil support, magnetic yoke, sliding block, and other structures;

[0021] Figure 8 This is an exploded structural diagram of the coil support installed inside the magnetic yoke and the transmission rod.

[0022] Figure 9 This is a schematic diagram of the main structure of the transmission rod of the present invention;

[0023] Figure 10 This is the electromagnetic schematic diagram of the load switch.

[0024] In the diagram: 1. Stationary contact; 2. Moving contact; 20. Conductive sheet; 21. Round hole; 22. Contact plate; 23. Insertion hole; 24. Energy storage torsion spring; 25. Flexible wire; 30. Magnetic yoke; 31. Shaft pin; 32. Coil frame; 33. Transmission rod; 34. Electromagnetic coil; 35. Sliding block; 36. Permanent magnet; 37. Guide groove; 38. Slide groove; 39. Pin; 310. Shaft pin hole; 4. Housing; 5. Pin; 6. Support shaft. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0026] Please see Figure 1-10 An embodiment of the present invention provides a load switch, comprising a housing 4, a stationary contact 1 and a moving contact 2 disposed within the housing 4; the moving contact 2 includes a contact plate 22; wherein, a support shaft 6 is also provided within the housing 4, and the contact plate 22 rotates along the support shaft 6 provided within the housing 4; a sliding block 35 is also provided within the housing 4; wherein, the sliding block 35 moves upward or downward within the housing 4, and a transmission rod 33 is provided on one side of the sliding block 35; by moving the sliding block 35, the transmission rod 33 causes the contact plate 22 to rotate along the support shaft 6, thereby completing the contact or separation of the contact plate 22 from the stationary contact 1.

[0027] In summary, this switch forms a crank-slider mechanism through the contact plate 22, sliding block 35, transmission rod 33, and support shaft 6. This crank-slider mechanism controls the opening and closing of the contact plate 22, resulting in a novel and unique on / off structure for the load switch circuit, while also minimizing the space occupied by the crank-slider mechanism. In particular, when the sliding block 35 slides downward inside the housing 4, the transmission rod 33 pries the contact plate 22 to separate from the stationary contact 1. Simultaneously, as the sliding block moves downward, the gap between the contact plate 22 and the stationary contact 1 is widened. This widening of the gap increases the safety isolation distance, facilitating the rapid extinguishing of the electric arc.

[0028] Furthermore, since one end of the transmission rod 33 is adapted to be connected to the shaft pin 31 provided in the middle of the sliding block 35 through the provided groove 38, and the other end of the transmission rod 33 is inserted into the insertion hole 23 provided on the contact plate 22 through the provided pin 39, the movement of the sliding block 35 causes the transmission rod 33 to cause the contact plate 22 to contact or separate from the stationary contact 1.

[0029] In summary, when the pivot pin 31 moves upward following the sliding block 35, it slides within the groove 38, causing the transmission rod 33 to drive the contact plate 22 to contact the stationary contact 1. Conversely, when the sliding block 35 moves downward, the pivot pin 31 slides within the groove 38, causing the contact plate 22 to separate from the stationary contact 1. Furthermore, by increasing the length of the groove 38, the distance between the contact plate 22 and the stationary contact 1 after separation is increased, thereby widening the electrical clearance between them. Additionally, the groove 38 reduces interference during the sliding of the pivot pin 31, and similarly, the connection between the pin 39 and the socket 23 reduces interference during the operation of the contact plate 22. Based on this, the crank-slider mechanism can operate smoothly and without interference.

[0030] Furthermore, since the contact plate 22 is connected to the support shaft 6 through the provided circular hole 21, and the transmission rod 33 is sleeved on the support shaft 6 through the provided shaft pin hole 310, and the movement of the sliding block 35 causes the transmission rod 33 to rotate along the support shaft 6, and the contact plate 22 to rotate along the support shaft 6, so as to cause the contact plate 22 to contact or separate from the stationary contact 1, the contact plate 22 can rotate in a specific direction, and the transmission rod 33 can also rotate in a specific direction, thereby ensuring that the operation of the crank slider mechanism is smooth and interference-free, and also ensuring that the operation between the contact plate 22 and the stationary contact 1 can be completed accurately and reliably.

[0031] Based on the above solution, an energy storage torsion spring 24 is also provided inside the housing 4; one end of the energy storage torsion spring 24 is fixed inside the housing 4, and the other end of the energy storage torsion spring 24 is fixed to the contact plate 22. When the contact plate 22 contacts or separates from the stationary contact 1, the energy storage torsion spring 24 can quickly open or close the contact plate 22 and the stationary contact 1 using its elastic force. Therefore, the energy storage torsion spring 24 not only retains the advantage of rapid opening and closing of the traditional spring energy storage mechanism, but also avoids the defect of slow action of the contact plate 22, thus enabling rapid, safe, and reliable disconnection of fault current and reducing safety hazards during the use of the switch.

[0032] Existing load switches, such as the prior art with announcement number CN201449957U, when used as load switches, utilize coil attraction to drive contact closure, and then a permanent magnet to hold them in the closed position. As a result, the structure for completing the contact separation and closure actions is relatively complex, occupies too much space, and causes the switch to be space-limited. Its permanent magnet is small, the holding force is small, and it cannot withstand large short-time withstand current.

[0033] Therefore, the switch also includes a coil frame 32, and the sliding block 35 is slidably mounted within the coil frame 32; both ends of the coil frame 32 are provided with electromagnetic coils 34, and the electromagnetic coils 34 cause the sliding block 35 to move directionally within the coil frame 32; wherein, the pivot pin 31 passes through the coil frame 32 from the outside to the inside and connects to the sliding block 35. Furthermore, permanent magnets 36 are provided on both sides of the coil frame 32, and the permanent magnets 36 are located between the two electromagnetic coils 34.

[0034] In summary, by using two coils to move the sliding block 35 within the coil frame 32, the sliding force of the sliding block 35 is stronger, thus improving the sensitivity of the device's opening and closing. Simultaneously, the two electromagnetic coils 34 cooperate with the permanent magnets 36 on both sides of the coil frame 32 to give the device a bistable coil magnetic force, which, under the action of the bistable coil magnetic force, causes the sliding block 35 to control the opening and closing of the contact plate 22. Therefore, this device effectively overcomes the shortcomings of existing technologies.

[0035] Furthermore, the coil frame 32 is provided with a magnetic yoke 30 on its exterior, and the side of the magnetic yoke 30 is provided with a guide groove 37 for guiding the sliding of the shaft pin 31. Therefore, while providing reliable support for the coil frame 32, it can also ensure the directional sliding of the shaft pin 31, thereby improving the stability of the crank sliding mechanism during operation.

[0036] Since the moving contact 2 also includes a conductive sheet 20, and the conductive sheet 20 is connected to the contact plate 22 via a flexible wire 25, the moving contact 2 is fixed in the housing 4 by the conductive sheet 20, while the flexible wire 25 reduces the interference and influence of the conductive sheet 20 on the contact plate 22 during operation.

[0037] In addition, the outer side of the housing 4 is provided with pins 5, and the pins 5 are electrically connected to the electromagnetic coil 34, thus facilitating the power supply of the electromagnetic coil 34.

[0038] Specifically, such as Figure 10 As shown, C is the charging and discharging capacitor, providing excitation energy to the mechanism. VT1, VT2, and VT3 are three thyristor switches, controlling the circuit's conduction and current flow. VD1 and VD2 are freewheeling diodes, providing a freewheeling path for the coil inductance. U is the DC voltage.

[0039] The load switch is in the open position, with thyristor VT1 conducting and VT2 and VT3 both cut off. DC voltage U charges the capacitor through thyristor VT1. When a trigger signal is applied to the base of thyristor VT1 to turn it on, the discharge circuit is activated, and capacitor C discharges through VT3 to the closing coil. Sliding block 35 causes contact plate 22 to close. Removing the trigger signal from VT3 turns it off, and freewheeling diode VD2 provides a freewheeling path for the energy stored in the inductor of the coil. Similarly, when VT2 is on, capacitor C discharges to the coil in the opposite direction to the closing circuit, causing the load switch to open.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A load switch, characterized in that: It includes a housing (4), a stationary contact (1) and a moving contact (2) disposed within the housing (4); the moving contact (2) includes a contact plate (22); wherein, a support shaft (6) is also provided within the housing (4), and the contact plate (22) rotates along the support shaft (6) provided within the housing (4); The housing (4) is also provided with a sliding block (35); wherein the sliding block (35) moves up or down inside the housing (4), and a transmission rod (33) is provided on one side of the sliding block (35). By moving the sliding block (35), the transmission rod (33) causes the contact plate (22) to rotate along the support shaft (6), thereby completing the contact or separation between the contact plate (22) and the stationary contact (1). The sliding block (35) is slidably engaged with the slide groove (38) at one end of the transmission rod (33) via the provided shaft pin (31), and the other end of the transmission rod (33) is connected to the insertion hole (23) on the contact plate (22) via the provided pin (39), and the contact plate (22) is connected to the support shaft (6) via the provided round hole (21); It also includes a coil frame (32), and the sliding block (35) is slidably installed in the coil frame (32); both ends of the coil frame (32) are provided with electromagnetic coils (34), and the electromagnetic coils (34) cause the sliding block (35) to move in a specific direction within the coil frame (32); wherein, the shaft pin (31) passes through the coil frame (32) from the outside to the inside and is connected to the sliding block (35); The coil frame (32) is also provided with permanent magnets (36) on both sides, and the permanent magnets (36) are located between the two electromagnetic coils (34).

2. A load switch according to claim 1, characterized in that: The transmission rod (33) is sleeved on the support shaft (6) through the provided shaft pin hole (310), and the movement of the sliding block (35) causes the transmission rod (33) to rotate along the support shaft (6), and the contact plate (22) rotates along the support shaft (6) to cause the contact plate (22) to contact or separate from the stationary contact (1).

3. A load switch according to claim 2, characterized in that: The housing (4) is also provided with an energy storage torsion spring (24); wherein one end of the energy storage torsion spring (24) is fixed inside the housing (4), and the other end of the energy storage torsion spring (24) is fixed on the contact plate (22).

4. A load switch according to claim 3, characterized in that: The coil frame (32) is also provided with a magnetic yoke (30) on the outside, and the side of the magnetic yoke (30) is also provided with a guide groove (37) to guide the sliding of the shaft pin (31).

5. A load switch according to claim 4, characterized in that: The moving contact (2) also includes a conductive sheet (20), and the conductive sheet (20) is connected to the contact plate (22) via a flexible wire (25).

6. A load switch according to claim 5, characterized in that: The outer side of the housing (4) is also provided with pins (5), and the pins (5) are electrically connected to the electromagnetic coil (34).

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