Electric load switch

Abstract

The invention discloses an electric load switch which at least comprises an insulating shell and internal elements, the internal elements are at least provided with a moving contact assembly, a static contact assembly, an electric assembly and transmission assemblies, the moving contact assembly is provided with a driving fulcrum, and at least one transmission assembly is at least provided with a central shaft, a transmission fulcrum and a gear; a connecting rod is connected between the driving fulcrum and the transmission fulcrum, and when the driving fulcrum, the transmission fulcrum and the center shaft are located on the same straight line in the movement process, the center shaft is located between the driving fulcrum and the transmission fulcrum. The position of the static contact assembly on the load switch is changed, the internal space of the load switch is fully utilized, the width Y-direction size of the load switch is effectively reduced, the area required for installation is reduced, the load switch is more convenient for a user to use in a narrow space, and the application range of the product is expanded.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage electrical appliances, and particularly relates to an electric load switch. Background Art

[0002] The load switches used in power systems mainly have two structures: electromagnetic-driven load switches and motor-driven load switches. The electromagnetic-driven load switch has the advantages of simple structure and small volume, but at the same time has the disadvantage of small contact opening distance. With the improvement of safety index requirements such as electrical clearance for load switches in power systems, the electromagnetic-driven load switch can no longer meet the new requirements. The motor-driven load switch has the advantages of large contact opening distance and strong overload capacity, and can meet the technical requirements put forward by the power system for load switches from a technical index perspective. However, due to the complex structure of the motor-driven load switch, the volume of the load switch is relatively large. In particular, the load switches of the prior art are arranged horizontally in the radial direction of the gear shaft with electric components, transmission gear sets, moving contact components, and static contact components, resulting in the disadvantages of large width direction dimensions and large required installation area of the existing load switches, making it impossible to install them into the devices of the power system and restricting the use range of the load switches. Summary of the Invention

[0003] Based on the above background, the present invention provides an electric load switch. By arranging the electric components, transmission gear sets, static contact groups, and moving contact groups horizontally in the radial direction of the gear shaft, the internal space of the load switch is fully utilized, and the dimensions of the load switch in the width direction are reduced.

[0004] The technical solution of the present invention is as follows:

[0005] An electric load switch includes at least an insulating housing and internal components. The internal components are at least provided with a moving contact component, a static contact component, an electric component, and a transmission component. A driving fulcrum is provided on the moving contact component. At least one of the transmission components is at least provided with a central axis, a transmission fulcrum, and a gear; a connecting rod is connected between the driving fulcrum and the transmission fulcrum. When the driving fulcrum, the transmission fulcrum, and the central axis are in a straight line during the movement process, the central axis is located between the driving fulcrum and the transmission fulcrum.

[0006] In this way, by setting the positions among the driving fulcrum, the transmission fulcrum, and the central axis, it is realized that the connecting rod and the central axis do not interfere or intersect. At the same time, the electric component, the transmission component, the static contact component, and the moving contact component are arranged along the movement direction of the first alloy contact, reducing the dimensions of the load switch in the width Y-axis direction.

[0007] In some embodiments, within a certain range before and after when the driving fulcrum, the transmission fulcrum, and the central axis are in a straight line during the movement process, the straight line connecting part of the center points of the fulcrum circles at both ends of the connecting rod will cross the central axis.

[0008] In the above embodiments, the straight-line connecting part of the centers of the fulcrum circles at both ends of the connecting rod crosses the central axis and is locked on the left side of the fixed plate groove after crossing the central axis, so that the switch alloy contacts are stably closed.

[0009] In some embodiments, the moving contact assembly at least includes a first alloy contact, a flexible wire or a rigid wire, a moving contact lead terminal, a driving fulcrum, and a rotating fulcrum. The moving contact lead terminal is of an integral structure or is formed by connecting two or more parts.

[0010] In the above embodiments, the driving fulcrum is connected to the connecting rod, and the driving force of the driving mechanism is received through the connecting rod, so that the moving contact assembly swings to complete the opening and closing operations of the load switch. The rotating fulcrum enables the moving contact assembly to rotate or swing around the driving fulcrum when driven by the driving force.

[0011] In some embodiments, the static contact assembly includes at least one second alloy contact and a static contact plate. The alloy contact and the static contact plate are of an integral structure or are formed by combining multiple parts. The static contact assembly is fixed on the insulating housing.

[0012] In the above embodiments, the second alloy contact and the first alloy contact cooperate to form reliable opening and conduction. The second alloy contact is welded or riveted to the static contact plate, or the second alloy contact and the static contact plate are integrally arranged.

[0013] In some embodiments, the second alloy contact is located between the electric component and the first alloy contact.

[0014] In the above embodiments, the static contact assembly is located between the electric component and the moving contact assembly, making full use of the space between the electric component and the moving contact, and reducing the size of the load switch in the width direction.

[0015] In some embodiments, the electrical gap l between the first alloy contact and the second alloy contact is ≥ 5.5 mm.

[0016] In the above embodiments, due to the adoption of the motor drive and the setting that the moving contact assembly rotates around the rotating fulcrum, the electrical gap between the moving contact and the static contact can meet the requirement of electrical gap ≥ 5.5 mm, improving the safety of the load switch during use.

[0017] In some embodiments, a fixed plate is provided on the upper part of the central axis, and a central hole is provided on the upper part of the fixed plate.

[0018] In some embodiments, the central hole is a through hole or a blind hole, and a convex platform higher than the upper side surface of the fixed plate is correspondingly provided on the upper part of the blind hole.

[0019] In the above embodiments, when the central hole on the fixing plate is a through hole, the central shaft does not protrude above the upper part of the mounting plate, avoiding obstruction or interference when the connecting rod crosses the central shaft; when the central hole on the fixing plate is a blind hole, the upper part of the blind hole protrudes above the boss on the upper side of the fixing plate, facilitating the forming of the blind hole by processing methods such as stamping.

[0020] In some embodiments, there is at least one arm on the fixing plate, and at least one mounting hole or / and shaft is provided on the arm.

[0021] In the above embodiments, the fulcrum circle connection parts at both ends of the connecting rod are bent towards the axial or radial direction of the central shaft. The bent part of the connecting rod is within a certain range before and after the driving fulcrum, the transmission fulcrum and the central shaft are in a straight line. When the straight connecting line part of the fulcrum circles at both ends of the connecting rod crosses the central shaft, the solid of the connecting rod does not intersect / interfere with the solid of the central shaft.

[0022] In the above embodiments, the bent part of the bent connecting rod is used to avoid the central shaft, enabling the connecting rod to bypass or cross the central shaft, avoiding obstruction or interference with the central shaft.

[0023] In some embodiments, the central shaft is arranged as a cantilever beam fixed structure, and one end of the central shaft is fixed on the insulating housing.

[0024] In the above embodiments, the central shaft is arranged as a cantilever beam fixed structure, and the upper end of the central shaft of the cantilever beam structure is higher than the upper top of the transmission part, enabling the bent connecting rod to cross or avoid the central shaft.

[0025] In some embodiments, a shunt or / and zero-sequence current transformer is provided on the moving contact assembly or / and the static contact assembly.

[0026] In the above embodiments, the shunt can be connected in series with the moving contact lead terminal to form a contact lead end, and the shunt can sample the current value flowing through the load switch; the shunt can also be connected in series with the static contact plate to form a static contact lead end, and the shunt can sample the current value flowing through the load switch for the mechanism where the load switch is located; the moving contact lead end passes through the central hole of the zero-sequence current transformer to provide sampling for the zero-sequence current transformer; or it can also be the static contact plate passing through the central hole of the zero-sequence current transformer to provide sampling for the zero-sequence current transformer.

[0027] The beneficial effects of the present invention are as follows:

[0028] The electric load switch of the present invention is arranged with the electric component, the transmission component, the moving contact component, and the static contact component arranged along the movement direction of the first alloy contact, reducing the size of the electric load switch in the width direction, reducing the surface area, solving the technical problem that the existing load switch cannot be installed and used, meeting the user's needs, and expanding the application range of the load switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments described in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic diagram of the internal structure of an existing load switch;

[0031] Figure 2 It is a schematic diagram of the internal structure of the electric load switch of the present application in the closed state;

[0032] Figure 3 It is a schematic diagram of the internal structure of the electric load switch of the present application in the open state;

[0033] Figure 4 is Figure 2 a schematic diagram of the structure of the middle connecting rod;

[0034] Figure 5 is Figure 2 a schematic diagram of the structure of the moving contact assembly in [[]];

[0035] Figure 6 is Figure 2 a schematic diagram of the structure of the static contact assembly in [[]];

[0036] Figure 7 It is a schematic diagram of the partial structure of the electric load switch of the present application;

[0037] Figure 8 and Figure 9 are schematic diagrams of the partial structures of the electric load switches of other embodiments;

[0038] Figure 10 It is a schematic diagram of the structure of the electric load switch of another embodiment;

[0039] Figure 11 It is a schematic diagram of the structure of the electric load switch provided with a shunt and a zero-sequence current transformer. Specific Embodiments

[0040] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely provided to better understand the present invention by showing examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but covers any modification, substitution, and improvement of elements, components, and algorithms without departing from the spirit of the present invention. Well-known structures and technologies are not shown in the drawings and the following description so as to avoid unnecessarily obscuring the present invention.

[0041] In the description of the embodiments of the present disclosure, the term "comprising" and its like shall be understood as an open inclusion, that is, "including but not limited to". The term "based on" shall be understood as "at least partially based on". The term "an embodiment" or "the embodiment" shall be understood as "at least one embodiment". The terms "first", "second", etc. may refer to different or the same objects. There may also be other explicit and implicit definitions hereinafter.

[0042] Figure 1 A schematic diagram of a load switch according to the prior art is shown. As Figure 1 shown, the load switch may include a DC motor 4, a turbine gear set 6, a moving contact 91, and a stationary contact 31. In this solution of the switching device, the DC motor 4, the turbine gear set 6, the moving contact 91, and the stationary contact 31 are arranged in the radial Y direction of the gear rotating shaft. The main defect of this solution is that the load switch has a large size and a large surface area in the Y direction, which limits the application range of the load switch.

[0043] In view of the problems existing in the existing load switch, the present application provides an electric load switch. By changing the pushing direction of the connecting rod, the relative positions of the second alloy contact of the stationary contact assembly, the electric assembly, and the moving contact assembly are changed, so that the second alloy contact of the stationary contact assembly is located between the first alloy contacts of the electric assembly and the moving contact assembly, effectively utilizing the internal space of the load switch and reducing the size of the load switch in the width direction. The electric load switch according to the embodiments of the present disclosure will be further described below with reference to the drawings.

[0044] Please refer to Figures 2 to 4, the electrical load switch of the present application includes an insulating housing 100 and internal components. The internal components at least include a moving contact assembly 200, a static contact assembly 300, an electric component 400, and a transmission component 500. The electric component 400 is disposed on the upper side of the insulating housing 100, and the static contact assembly 300 and the moving contact assembly 200 are disposed on the lower side of the insulating housing 100. A driving fulcrum 2004 is provided on the moving contact assembly 200. The transmission component 500 includes a central shaft 5001, a transmission fulcrum 5002, and a gear 5003. A connecting rod 600 is connected between the driving fulcrum 2004 and the transmission fulcrum 5002. The driving fulcrum 2004 is connected to the connecting rod 600. By the connecting rod 600 carrying the driving force of the electric component, the moving contact assembly 200 is caused to swing, completing the opening and closing operations of the load switch. When the driving fulcrum 2004, the transmission fulcrum 5002, and the central shaft 5001 are in the same straight line during the movement process, the central shaft 5001 is located between the driving fulcrum 2004 and the transmission fulcrum 5002. The connecting rod 600 is U-shaped, and two fulcrum circles 6002 are provided at both ends of the U-shaped bottom. A straight line connecting portion 6001 is formed by connecting the two fulcrum circles 6002. In this embodiment, the straight line connecting portion 6001 is higher than the central shaft 5001 in the height direction of the load switch. In a certain range before and after the driving fulcrum 2004, the transmission fulcrum 5002, and the central shaft 5001 are in a straight line, the straight line connecting portion 6001 between the two fulcrum circles 6002 at both ends will cross the central shaft 5001.

[0045] The gear 5003 includes a turbine and a worm. The electric component 400 rotates upon receiving an external control signal, driving the turbine and the worm to rotate and decelerate. The turbine pushes the transmission component to rotate around the central shaft 5001. The rotation fulcrum 5002 on the circumference of the transmission component rotates around the central shaft 5001 and generates a circumferential displacement. The transmission fulcrum transmits the displacement and the driving force to the driving fulcrum 2004 of the moving contact assembly 120 through the connecting rod 600, driving the moving contact assembly 200 to rotate or swing around the rotation fulcrum, completing the closing or opening operation of the load switch.

[0046] The moving contact assembly 200 further includes a first alloy contact 2001, a flexible wire 2002, a moving contact lead terminal 2003, and a rotating fulcrum 2005. The flexible conductor 2002 is used to connect and conduct the first alloy contact 2001 and the moving contact lead terminal 2003 to ensure the flow of large current. The static contact assembly 300 is fixedly connected to the insulating housing 100 and includes a second alloy contact 3001 and a static contact plate 3002. The second alloy contact 3001 is welded to the static contact plate 3002. The static contact plate 3002 also serves as the static contact lead terminal. The second alloy contact 3001 is located between the electric component 400 and the first alloy contact 2001. The first alloy contact 2001 and the second alloy contact 3001 cooperate to form reliable breaking and conduction. In this embodiment, the electrical gap l between the first alloy contact 2001 and the second alloy contact 3001 is ≥ 5.5 mm.

[0047] It should be noted that the moving contact lead terminal 2003 can be an integral structure or composed of two or more parts connected together; the second alloy contact 3001 and the static contact plate 3002 can be an integral structure or composed of a combination of multiple parts.

[0048] Please continue to refer to Figures 2 to 4 , at least one arm and an arc groove 7004 for avoiding the connecting rod 600 are provided on the fixing plate 700. The arc groove 7004 is on the circumference where the fulcrum circle 6002 moves. At least one mounting hole 7002 is provided on the arm. In this embodiment, one arm extends from each end of the fixing plate 700. One mounting hole 7002 is provided on the arm at one end, and two mounting holes 7002 are provided on the arm at the other end. This application does not limit the shape and number of the arms, nor the fixing position and method of the fixing plate and the insulating housing.

[0049] Please refer to Figure 2 , Figure 5 and Figure 6 , a yoke 2006 is further provided on the moving contact assembly 200, and a magnetic yoke 3003 is correspondingly provided on the static contact assembly 300. The yoke 2006 and the magnetic yoke 3003 cooperate to generate a suction force to compensate the contact pressure and overcome the Holm force under large current.

[0050] In some embodiments, as Figure 5 shown, a hard conductor 2007 is superimposed on the first alloy contact 2001 part of the moving contact assembly 200. The hard conductor 2007 increases the connection area of the flexible conductor 2002 and facilitates the dispersed connection of multiple flexible wires.

[0051] Please refer to Figure 7, a fixing plate 700 is provided on the upper part of the central shaft 5001, and a central hole 7001 is provided on the upper part of the fixing plate 700. In this embodiment, the central hole 7001 is a through hole. In other embodiments, such as Figure 8 as shown, the central hole can also be a blind hole, and the part of the blind hole that protrudes above the upper part of the fixing plate forms a boss 7003. The connecting rod 600 is axially bent towards the central shaft 5001, and the bent part of the connecting rod can span the boss 7003 within a certain range before and after the driving fulcrum 2004, the transmission fulcrum 5002 and the central shaft 5001 are in a straight line, so that there is no intersection or interference between the connecting rod 600 and the boss 7003.

[0052] In some embodiments, such as Figure 9 as shown, the connecting rod 600 can also be radially bent towards the central shaft 5001, and the bent part of the connecting rod 600 can avoid the boss 7003 within a certain range before and after the driving fulcrum 2004, the transmission fulcrum 5002 and the central shaft 5001 are in a straight line, so that the connecting rod does not intersect or interfere with the boss 7003.

[0053] In some embodiments, such as Figure 10 as shown, the central shaft 5001 is arranged as a cantilever beam fixed structure, there is no fixing plate on the upper side of the central shaft 5001, the upper end of the central shaft 5001 does not protrude or protrudes above the top of the transmission assembly 500, and there is no intersection or interference between the central shaft 5001 and the connecting rod 600.

[0054] In some embodiments, such as Figure 11 as shown, a shunt 800 is provided on the moving contact lead terminal 2003, that is, the shunt 800 is connected to the moving contact lead terminal 2003 to form an integrated moving contact lead terminal 2003. The shunt 800 is located on one side of the load switch. A zero-sequence current transformer 900 is provided on the static contact plate 3002. The static contact plate 3002 passes through the central hole of the zero-sequence current transformer 900, and the zero-sequence sampling line 20 also passes through the central hole of the zero-sequence current transformer 900. The zero-sequence current transformer 900 and the zero-sequence sampling line 20 form a zero-sequence sampling circuit. The zero-sequence current transformer 900 is located on the other side of the load switch. An insulating layer is provided between the static contact plate 3002 and the zero-sequence sampling line 20.

[0055] It should be noted that the shunt 800 can also be connected in series in the static contact plate 3002 to become an integrated static contact plate 3002; it can also be that the moving contact lead terminal 2003 passes through the central hole of the zero-sequence current transformer 900. This application does not limit the positions of the shunt 800 and the zero-sequence current transformer 900, and they can be arranged on the same side or the opposite side, the upper side or the lower side, the left side or the right side of the load switch, and can be flexibly arranged according to the actual situation.

[0056] The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The current embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the present invention being defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced within the scope of the present invention.

Claims

1. An electric load switch (10), comprising at least an insulating housing (100) and internal components, wherein the internal components are provided with at least a moving contact assembly (200), a stationary contact assembly (300), an electric assembly (400), and a transmission assembly (500), wherein the moving contact assembly (200) is provided with a driving fulcrum (2004), and at least one of the transmission assemblies (500) is provided with at least a central axis (5001), a transmission fulcrum (5002), and a gear (5003); a connecting rod (600) is connected between the driving fulcrum (2004) and the transmission fulcrum (5002), characterized in that: When the driving fulcrum (2004), the transmission fulcrum (5002) and the central axis (5001) are in the same straight line during the movement, the central axis (5001) is located between the driving fulcrum and the transmission fulcrum.

2. An electrical load switch (10) as claimed in claim 1, characterized in that: The driving fulcrum (2004), the transmission fulcrum (5002) and the central axis (5001) are in a straight line during the movement, and the straight line connecting the centers of the fulcrum circles (6002) at both ends of the connecting rod (6001) will cross the central axis.

3. An electrical load switch (10) as claimed in claim 1, characterized in that: The moving contact assembly (200) comprises at least a first alloy contact (2001), a soft wire or a hard wire (2002), a moving contact lead terminal (2003), a driving fulcrum (2004), and a rotating fulcrum (2005); the moving contact lead terminal (2003) is an integrated structure, or is formed by connecting two or more parts.

4. An electrical load switch (10) as claimed in claim 3, characterized in that: The stationary contact assembly (300) comprises at least one second alloy contact (3001) and a stationary contact plate (3002); the second alloy contact (3001) and the stationary contact plate (3002) are an integrated structure or are composed of a plurality of parts; and the stationary contact assembly (300) is fixed on the insulating housing (100).

5. An electrical load switch as claimed in claim 4, characterized in that: The second alloy contact (3001) is located between the electric component (400) and the first alloy contact (2001).

6. An electrical load switch as claimed in claim 4, characterized in that: The electrical gap l between the first alloy contact (2001) and the second alloy contact (3001) is ≥5.5 mm.

7. An electrical load switch as claimed in claim 1, characterized in that: A fixing plate (700) is disposed on the upper portion of the central axis (5001), and a center hole (7001) is disposed on the upper portion of the fixing plate (700).

8. An electrical load switch as claimed in claim 7, characterized in that: The central hole (7001) is a through hole or a blind hole, and a boss (7003) higher than the side surface of the fixing plate is correspondingly arranged on the upper part of the blind hole.

9. An electrical load switch as claimed in claim 7, characterized in that: The fixing plate (700) has at least one arm, and the arm is provided with at least one mounting hole and / or a shaft (7002).

10. An electrical load switch according to claim 1, characterized in that: The supporting circle connection parts at both ends of the connecting rod are bent toward the axial direction or radial direction of the central axis.

11. An electrical load switch according to claim 1, characterized in that: The central axis (5001) is configured as a cantilever beam fixing structure, and one end of the central axis (5001) is fixed on the insulating housing (100).

12. An electrical load switch as claimed in claim 1, 2 or 3, characterized in that: The moving contact assembly (200) or / and the stationary contact assembly (300) is provided with a shunt (800) or / and a zero-sequence mutual inductor (900).

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