CN114078655A

CN114078655A - Load switch

Info

Publication number: CN114078655A
Application number: CN202110544003.1A
Authority: CN
Inventors: 于纪磊; 南寅; 朱金保; 孟令乾
Original assignee: Tianjin Svrui Intelligent Electrical Co Ltd
Current assignee: Tianjin Svrui Intelligent Electrical Co Ltd
Priority date: 2020-08-17
Filing date: 2021-05-19
Publication date: 2022-02-22

Abstract

The invention discloses a load switch which comprises an insulating shell, and an electrically-driven bistable electromagnet, a moving contact, a fixed contact, an incoming line terminal and an outgoing line terminal which are arranged in the insulating shell, wherein the moving contact is arranged at one end of the electrically-driven bistable electromagnet, and the fixed contact is arranged in front of the moving contact. The load switch of the invention improves the electric clearance and the contact terminal pressure in a narrow space, and improves the withstand voltage when the contact is disconnected and the short-circuit current bearing capacity when the contact is closed.

Description

Load switch

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a load switch for an electric energy meter.

Background

The load switch for the conventional electric energy meter adopts a magnetic latching relay, the electric gap between the contacts of the magnetic latching relay is small, the dielectric property between the switch contacts cannot meet the standard requirement of the electric energy meter, and the short-circuit current bearing capacity is lower than the standard requirement, so that the electric safety and the continuity are greatly influenced.

In addition, the existing magnetic latching relay has large appearance volume, occupies large internal space of the electric energy meter, is not beneficial to the arrangement of other components, leads to compact arrangement of other components in the electric energy meter, and even can not realize partial functions due to insufficient space.

Disclosure of Invention

Based on the above mentioned drawbacks and deficiencies of electrical safety and electrical continuity caused by small electrical gap and low short-circuit current carrying capability, the present invention is to design a load switch, which can effectively overcome at least one of the above problems by adjusting the contact structure to reduce the volume of the load switch.

The invention is realized by the following technical scheme:

the invention provides a load switch which comprises an insulating shell, and an electric drive bistable electromagnet, a moving contact, a fixed contact, an incoming line terminal and an outgoing line terminal which are arranged in the insulating shell, wherein the moving contact is arranged at one end of the electric drive bistable electromagnet, and the fixed contact is arranged in front of the moving contact.

Preferably, the Y axis of the electrically-driven bistable electromagnet is perpendicular or relatively perpendicular to the X axis of the stationary contact.

Preferably, the wiring ports of the fixed contact and the incoming line terminal and the wiring port of the outgoing line terminal are arranged in front of the electrically-driven bistable electromagnet.

Preferably, an elastic device is arranged on the movable contact or the static contact.

Preferably, the moving contact and the fixed contact are in a single-breakpoint and double-contact structure.

Preferably, the moving contact and the fixed contact are of a double-breakpoint structure.

Preferably, the number of the fixed contacts is two, and the insulating device between the two fixed contacts is arranged in front of the movable contact.

Preferably, the moving contact is a direct-acting single-break point and single-contact structure.

Preferably, the moving contact is a lever-type single-break point and single-contact structure.

Preferably, one end of the movable contact is rotatably arranged on the insulating shell.

Preferably, the movable contact is connected with the incoming line terminal or the outgoing line terminal through a soft conductor.

Preferably, the incoming or outgoing terminal is provided with a shunt.

Preferably, the width of the insulating housing is narrower at the end where the electrically-driven bistable electromagnet is arranged than at the end where the static contact is arranged.

Preferably, the moving contact comprises at least one group of moving contact and a moving contact bridge.

Preferably, the movable contact and the elastic device are movably arranged at one end of the electrically-driven bistable electromagnet.

Preferably, the electrically-driven bistable electromagnet comprises a movable iron core, the movable contact comprises a movable contact and a movable contact bridge, the movable contact and the elastic device are movably arranged at one end of the movable iron core relative to the movable iron core, the movable iron core comprises a main body part and an extension part, the main body part and the extension part are different in diameter, a first boss is formed between the main body part and the extension part, and a clamping groove is formed in the end part of the extension part.

Preferably, a movable stopper element of the elastic means is provided on the extended portion, the movable stopper element being separably contacted with the first boss.

Preferably, the elastic element of the elastic device is arranged between the movable limiting element and the movable contact bridge, and two ends of the elastic element are respectively in contact with the movable limiting element and the movable contact bridge and are in an elastic deformation state.

Preferably, the load switch further comprises a fixed limiting element, the fixed limiting element is arranged on the clamping groove, the fixed limiting element and the moving contact are located on the same side of the moving contact bridge, and the fixed limiting element and the moving contact bridge are in separable contact.

Preferably, the insulation housing is provided with a yielding structure hole, and the yielding structure hole is a through hole or a semicircular hole.

In another aspect, the invention further provides an electric energy meter using the load switch, and when the load switch is installed on the electric energy meter, a distance between one edge of the load switch and one edge of the electric energy meter is less than 5 mm.

Preferably, the insulation shell is provided with a yielding structure hole which can penetrate through a rod used for fixing the PCB on the electric energy meter.

The invention has the following beneficial effects:

1. the load switch designed by the invention improves the electric clearance and the contact terminal pressure in a narrow space, and improves the withstand voltage capability when the contact is disconnected and the short-circuit current bearing capability when the contact is closed.

2. According to the load switch, one end of the electric-driven bistable electromagnet is narrower than one end provided with the static contact, the size is smaller than that of a similar product, the installation distance is closer to the edge of the electric energy meter, and a larger space can be provided for other components in the electric energy meter.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an external structure of a first embodiment of a load switch according to the present invention.

Fig. 2 is a schematic diagram of an internal structure of the load switch according to the first embodiment of the present invention in the open state.

Fig. 3 is a schematic diagram showing the relative position relationship between an electrically-driven bistable electromagnet and a fixed contact of the load switch of the present invention.

Fig. 4 is a schematic diagram of the internal structure of the electrically-driven bistable electromagnet and the position of the elastic device in the closing state of the first embodiment of the load switch according to the present invention.

Fig. 5 is a schematic diagram of the internal structure and the position of the elastic device of the electrically driven bistable electromagnet in the open state of the first embodiment of the load switch of the present invention.

Fig. 6 is a schematic structural diagram of the movable iron core of the load switch of the present invention.

Fig. 7 is a schematic diagram of an internal structure of a load switch according to a second embodiment of the present invention.

Fig. 8 is a schematic diagram of an internal structure of a load switch according to a third embodiment of the present invention.

Fig. 9 is a schematic diagram of an internal structure of a load switch according to a fourth embodiment of the present invention.

Fig. 10 is a schematic diagram of the installation position of the load switch of the present invention inside the electric energy meter.

Fig. 11 is a schematic structural view of a hole of a relief structure arranged on an insulating housing of a load switch.

Detailed Description

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. It will be apparent, however, to one 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 intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

First embodiment

As shown in fig. 1 to 6, the present embodiment discloses a load switch, where the load switch includes an insulating housing 100, and an electrically-driven bistable electromagnet 200, a movable contact 300, a fixed contact 400, an elastic device 500, an incoming line terminal 600, an outgoing line terminal 700, and a fixed limiting device 800 that are disposed in the insulating housing 100, where the insulating housing 100 includes a first housing 110 and a second housing 120, the first housing 110 and the second housing 120 jointly enclose the insulating housing 100, the electrically-driven bistable electromagnet 200, the movable contact 300, the fixed contact 400, the elastic device 500, the incoming line terminal 600, the outgoing line terminal 700, and the fixed limiting device 800 are disposed in the insulating housing 100 that is formed by the first housing 110 and the second housing 120 jointly enclosing, a width of the insulating housing 100 is such that one end where the electrically-driven bistable electromagnet 200 is disposed is narrower than one end where the electrically-driven bistable electromagnet 400 is disposed, the size of the load switch is reduced, and the occupied space is small when the load switch is installed in the electric energy meter.

Specifically, as shown in fig. 3, a Y axis of the electrically-driven bistable electromagnet 200 is perpendicular or relatively perpendicular to an X axis of the static contact 400, the moving contact 300 is disposed at one end of the electrically-driven bistable electromagnet 200, the static contact 400 is disposed in front of the electrically-driven bistable electromagnet 200, and the electrically-driven bistable electromagnet 200 moves along the Y axis direction to drive the moving contact 300 to contact with or separate from the static contact 400, so as to turn on or off the load switch.

Referring to fig. 4, the electrically-driven bistable electromagnet 200 includes a magnetic yoke 210, a cover plate 220, a frame 230, a coil 240, a first permanent magnet 250, a second permanent magnet 260, a first stationary core 270, a second stationary core 280, and a movable core 290, where the coil 240 is wound on the frame 230, the first permanent magnet 250 and the second permanent magnet 260 are disposed in mounting slots of the frame 230, the magnetic yoke 210 is fixedly connected to the cover plate 220, the frame 230 is fixedly connected to inner sides of the magnetic yoke 210 and the cover plate 220, magnetic pole faces of the first permanent magnet 250 and the second permanent magnet 260 are attached to inner sides of the magnetic yoke 210, the first stationary core 270 and the second stationary core 280 are respectively fixedly connected to inner sides of the magnetic yoke 210 and the cover plate 220 and penetrate through a middle hole of the frame 230, the movable core 290 is disposed in a middle hole of the frame 230 and can be attached to the first stationary core 270, The second stationary core 280 moves back and forth.

The movable contact 300 includes a movable contact bridge 320, a flexible conductor 330, a first movable contact 311 and a second movable contact 312, where the first movable contact 311 and the second movable contact 312 are respectively disposed at two ends of the movable contact bridge 320, and when the movable contact is specifically disposed, the first movable contact 311 and the second movable contact 312 may be symmetrically disposed along a central axis of the movable iron core 290, and may also be asymmetrically disposed; the fixed contact 400 is disposed on the incoming line terminal 600 or the outgoing line terminal 700, in this embodiment, the fixed contact is disposed on the incoming line terminal 600, the fixed contact 400 includes a first fixed contact 411 disposed corresponding to the first movable contact 311, and a second fixed contact 412 disposed corresponding to the second fixed contact 312, and the elastic device 500 includes a movable limiting device 510 and an elastic element 520.

As shown in fig. 6, the plunger 290 includes a main body 290A and an extension 290B, the main body 290A has a larger diameter than the extension 290B, a first boss 291 is formed at a joint of the main body 290A and the extension 290B, the main body 290A includes a first main body 290A-1, a second main body 290A-2 and a third main body 290A-3, which are connected in sequence, the second main body 290A-2 has a larger diameter than the first main body 290A-1 and the third main body 290A-3, a second boss 294 is formed at a joint of the first main body 290A-1 and the second main body 290A-2, and a third step 293 is formed at a joint of the second main body 290A-2 and the third main body 290A-3.

Referring to fig. 4 and fig. 5, the movable contact 300 and the elastic device 500 are disposed on the movable iron core 290, specifically, the extension portion 290B sequentially passes through the movable limiting device 510, the elastic element 520 and the movable contact bridge 320, an end portion of the extension portion is fixed to the fixed limiting device 800 through the slot 292 in a matching manner, one end of the elastic element 520 abuts against the movable limiting device 510, the other end abuts against the movable contact bridge 320, the elastic element 520 is always in an elastic deformation state, when the movable contact 300 and the fixed contact 400 are in a closed state, the elastic element 520 provides a contact terminal pressure for the movable contact 300, and when the movable contact 300 and the fixed contact 400 are in an open state, the elastic element 520 provides a reaction force for the movable contact 300 to ensure that the electrically driven bistable electromagnet 200 maintains a force balance between the closed state and the open state, the movable contact bridge 320 is connected to an outlet terminal 700 or an inlet terminal 600 through a flexible conductor 330, in this embodiment, the flexible conductor 330 is connected to the outlet terminal 700.

Incoming line terminal (600) or outgoing line terminal (700) are provided with the shunt, the shunt can enlarge instrument measuring current range for the current-limiting is made to the circuit return circuit, and the sample detection that flow equalizes.

When the electrically-driven bistable electromagnet 200 inputs a forward excitation signal, the direction of the magnetic field changes, the movable iron core 290 moves in a direction away from the cover plate 220, after moving for a certain stroke, the first boss 291 contacts with the movable limiting device 510, the movable iron core 290 continues to move to drive the movable contact 300 to move to contact with the fixed contact 400, the load switch is switched on, at this time, the fixed limiting device 800 is separated from the movable contact bridge 320, the third boss 293 contacts with the first fixed iron core 270 and is kept by magnetic force, and the elastic element 520 is in a compression deformation state to provide contact terminal pressure for the movable contact 300.

When the switch is switched on, the movable iron core 290 contacts with the first fixed iron core 270 and provides a suction force not less than 20N, the movable iron core 290 drives the movable contact 300 arranged thereon to contact with the fixed contact 400, the first movable contact 311 is in contact fit with the first fixed contact 411, the second movable contact 312 is in contact fit with the second fixed contact 412, a contact pressure not less than 5N is provided through deformation of the elastic element 520, a short-circuit current not less than 3000A/10ms is borne, and the contacts are not adhered.

When the electrically-driven bistable electromagnet 200 inputs a reverse excitation signal, the direction of the magnetic field is changed again, the movable iron core 290 moves in a direction close to the cover plate 220, after moving for a certain stroke, the fixed limiting device 800 contacts with the movable contact bridge 320, the movable iron core 290 continues to move to drive the movable contact 300 to be separated from the fixed contact 400, the load switch is turned off, after continuing to move for a certain stroke, the movable limiting device 510 contacts with the magnetic yoke 210, the movable iron core 290 continues to move until the second boss 294 contacts with the second stationary iron core 280 and is kept by magnetic force, and the elastic element 520 deforms to provide a reaction force.

When the switch is opened, the movable iron core 290 contacts with the second fixed iron core 280 and provides a suction force not less than 20N, the movable iron core 290 drives the movable contact 300 arranged on the movable iron core to be disconnected with the fixed contact 400, the first movable contact 311 is separated from the first fixed contact 411, the second movable contact 312 is separated from the second fixed contact 412, the electrical gap is not less than 5.5mm, and the power frequency voltage not less than 4000V/1min can be endured.

The load switch of the embodiment improves the electric clearance and the contact terminal pressure in a narrow space, and improves the withstand voltage capability when the contact is disconnected and the short-circuit current bearing capability when the contact is closed.

Second embodiment

Referring to fig. 7, this embodiment discloses another contact type of the load switch. The difference from the first embodiment is that the first stationary contact 411 of the present embodiment is disposed on the incoming line terminal 600, the second stationary contact 412 is disposed on the outgoing line terminal 700, the insulating device 103 is disposed on the insulating housing 100 between the first stationary contact 411 and the second stationary contact 412, the insulating device 103 is located in front of the movable contact 300, the insulating device 103 can increase the creepage distance of the arc between the two stationary contacts, and meanwhile, the movable contact bridge 320 is no longer connected to the outgoing line terminal 700 or the incoming line terminal 600. When the load switch performs opening and closing movements, the action principle of the internal mechanism is the same as that described in the first embodiment, and details are not described here.

Third embodiment

Referring to fig. 8, the present embodiment discloses a third contact form of a load switch, which is different from the first embodiment in that the moving contact 300 and the static contact 400 of the present embodiment are both single-break contacts, specifically, the moving contact 300 includes a moving contact 310 and a moving contact bridge 320, the moving contact 310 is disposed at a middle position of a front end of the moving contact bridge 320, the moving contact 300 is disposed at one end of the electrically-driven bistable electromagnet 200, the moving contact 310 and the moving iron core 290 are located on the same axis, and the static contact 400 includes a static contact disposed on the incoming line terminal 600 or the outgoing line terminal 700. When the load switch performs opening and closing movements, the action principle of the internal mechanism is the same as that described in the first embodiment, and details are not described here.

Fourth embodiment

Referring to fig. 9, the present embodiment discloses a fourth contact form of a load switch, which is different from the first embodiment in that the moving contact 300 in the present embodiment is of a lever type, the moving contact 300 includes a moving contact 310, a moving contact bridge 320, and a soft conductor 330, the moving contact bridge 320 is connected to an incoming terminal 600 or an outgoing terminal 700 through the soft conductor 330, the moving contact 310 is disposed at one end of the moving contact bridge 320, and the other end of the moving contact bridge 320 is disposed with a shaft hole and rotatably connected to the insulating housing 100 through a rotating shaft. When the load switch performs opening and closing movements, the action principle of the internal mechanism is the same as that described in the first embodiment, and details are not described here.

Referring to fig. 10, an embodiment of the invention further discloses an electric energy meter with the load switch, where the electric energy meter includes a housing, and when the load switch is installed on the electric energy meter, a distance between a side wall of the load switch and an adjacent side of the housing and an inner wall of the housing is less than 5 mm.

Referring to fig. 11, in order to ensure that the distance between the load switch and the inner wall of the housing is less than 5mm, a relief structure hole 101 is formed in an insulating housing 100 of the load switch, and is used for passing through a rod for fixing a PCB on the electric energy meter. The abdicating structure hole 101 is a circular, oval or rectangular through hole, or a semicircular, oval or rectangular abdicating groove.

When the load switch according to the first to fourth embodiments of the present invention is applied to an electric energy meter, a distance between an edge of the installed load switch and an edge of the electric energy meter is less than 5mm, and meanwhile, the load switch according to the present invention has a smaller volume than a similar product, such that a larger space inside the electric energy meter can be saved for installing other components, and functions and performance of the electric energy meter can be increased or enhanced.

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

Claims

1. The load switch is characterized by comprising an insulating shell (100), and an electrically-driven bistable electromagnet (200), a movable contact (300), a fixed contact (400), an incoming line terminal (600) and an outgoing line terminal (700) which are arranged in the insulating shell (100), wherein the movable contact (300) is arranged at one end of the electrically-driven bistable electromagnet (200), and the fixed contact (400) is arranged in front of the movable contact (300).

2. A load switch according to claim 1, characterized in that the Y-axis of the electrically driven bistable electromagnet (200) is perpendicular or relatively perpendicular to the X-axis of the stationary contact (400).

3. The load switch according to claim 1, wherein the fixed contact (400), the connection port of the incoming terminal (600) and the connection port of the outgoing terminal (700) are disposed in front of the electrically-driven bistable electromagnet (200).

4. A load switch according to claim 1, characterized in that said movable contact (300) or said stationary contact (400) is provided with elastic means (500).

5. The load switch according to claim 1, wherein said movable contact (300) and said stationary contact (400) are in a single-break, double-contact configuration.

6. A load switch according to claim 1, characterized in that said movable contact (300) and said stationary contact (400) are of a double break point structure.

7. A load switch according to claim 6, characterized in that the number of said fixed contacts (400) is two, and the insulating means between said two fixed contacts (400) is arranged in front of said movable contact (300).

8. The load switch according to claim 1, wherein the movable contact (300) is a direct-acting single-break, single-contact structure.

9. A load switch according to claim 1, wherein the movable contact (300) is a lever-type single-break, single-contact structure.

10. A load switch according to claim 9, characterized in that one end of said movable contact (300) is rotatably mounted on said insulating housing (100).

11. A load switch according to claim 1, characterized in that said movable contact (300) is connected to said incoming terminal (600) or said outgoing terminal (700) by a flexible conductor.

12. A load switch according to claim 1, characterized in that the incoming (600) or outgoing (700) terminal is provided with a shunt.

13. A load switch according to claim 1, characterized in that the width of the insulating housing (100) is such that the end provided with the electrically driven bistable electromagnet (200) is narrower than the end provided with the stationary contact (400).

14. A load switch according to claim 1, characterized in that said movable contact (300) comprises at least one set of movable contact (310) and movable contact bridge (320).

15. A load switch according to claim 4, characterized in that said movable contact (300) and said elastic means (500) are movably arranged at one end of said electrically driven bistable electromagnet (200).

16. A load switch according to claim 15, wherein said electrically driven bistable electromagnet (200) comprises a movable iron core (290), said movable contact (300) comprises a movable contact (310) and a movable contact bridge (320), said movable contact (300) and said elastic means (500) are movably disposed at one end of said movable iron core (290) relative to said movable iron core (290), said movable iron core (290) comprises a main body portion (290A) and an extension portion (290B) with different diameters, a first projection (291) is formed between said main body portion (290A) and said extension portion (290B), and a clamping groove (292) is disposed at an end of said extension portion (290B).

17. A load switch according to claim 16, characterized in that a movable stop element (510) of the resilient means (500) is arranged on the extension (290B), the movable stop element (510) being detachably in contact with the first boss (291).

18. A load switch according to claim 16, characterized in that the elastic element (520) of the elastic means (500) is arranged between the movable limiting element (510) and the movable contact bridge (320), and both ends of the elastic element (520) are in contact with the movable limiting element (510) and the movable contact bridge (320) respectively and are in an elastically deformed state.

19. The load switch of claim 16, further comprising a fixed position-limiting element (800), wherein the fixed position-limiting element (800) is disposed on the slot (292), the fixed position-limiting element (800) and the moving contact (310) are located on the same side of the moving contact bridge (320), and the fixed position-limiting element (800) and the moving contact bridge (320) are detachably contacted.

20. The load switch according to claim 1, wherein the insulation housing (100) is provided with a relief structure hole (101), and the relief structure hole (101) is a through hole or a semicircular hole.

21. An electric energy meter using the load switch according to any one of claims 1 to 20, wherein an edge of the load switch is spaced from an edge of the electric energy meter by less than 5mm when the load switch is mounted on the electric energy meter.

22. An electric energy meter according to claim 21, characterized in that the recess (101) provided in the insulating housing (100) is adapted to pass through a rod of the electric energy meter for fixing the PCB.