Load switch and ammeter

Abstract

The utility model provides a load switch and an ammeter, and relates to the technical field of electrical equipment. The load switch comprises a housing, a static contact, a moving contact, a driving control mechanism and a protection mechanism. The static contact, the moving contact, the driving control mechanism and the protection mechanism are all arranged in the shell, the moving contact is movably arranged in the shell, the driving control mechanism is used for driving the moving contact and the static contact to be switched on or switched off, and the protection mechanism is used for driving the moving contact and the static contact to be switched off in the state that the moving contact and the static contact are switched on and in the current abnormal state. The driving control mechanism can drive the moving contact to move relative to the shell so as to drive the moving contact and the static contact to be switched on or switched off. And in a closing state, when the current of the circuit is in fault states such as short circuit, the protection mechanism directly acts on the moving contact and drives the moving contact to move in the direction away from the static contact, so that the moving contact and the static contact are quickly disconnected, and the circuit breaking response speed in the fault states such as short circuit is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to a load switch and an electricity meter. Background Technology

[0002] In existing technologies, load switches are placed inside smart meters and used in conjunction with current transformers to detect electricity theft or leakage. The metering of electrical energy controls the on / off state of the built-in load switch. However, the built-in load switch lacks fault current protection, still requiring an external circuit breaker to promptly disconnect the circuit in case of faults. This results in cumbersome installation, redundant functions, and increased costs due to complex structures. Therefore, there is an urgent need for a smart meter with a built-in load switch that provides protective operation. Utility Model Content

[0003] The purpose of this utility model is to provide a load switch and meter that has a simple structure, low production cost, and can quickly drive the moving contact to forcibly open the circuit breaker, thereby achieving circuit breaker protection.

[0004] The embodiments of this utility model are implemented as follows:

[0005] In a first aspect, this utility model provides a load switch, comprising:

[0006] case;

[0007] A stationary contact, wherein the stationary contact is disposed in the housing;

[0008] A moving contact, which is movably disposed within the housing;

[0009] A drive control mechanism is disposed in the housing and is used to drive the moving contact to close or open with the stationary contact;

[0010] A protection mechanism is disposed in the housing. The protection mechanism is used to drive the moving contact and the stationary contact to open when the moving contact and the stationary contact are closed and when a short-circuit current occurs.

[0011] In an optional embodiment, the load switch further includes a connecting conductor, and the protection mechanism includes a mounting component, a stationary iron core, a moving iron core, a drive rod, a coil, and a first yoke. The stationary iron core is disposed within the mounting component, and the moving iron core is movably disposed within the mounting component. One end of the drive rod is connected to the moving iron core, and the other end is disposed at the moving contact. The coil is sleeved on the outside of the mounting component and connected to the connecting conductor. The coil is also disposed on the first yoke.

[0012] The stationary iron core is used to generate electromagnetic force when the coil is energized, so as to drive the moving iron core to move the drive rod, thereby causing the moving contact to disconnect from the stationary contact.

[0013] In an optional embodiment, the load switch further includes a wire, one end of which is connected to the coil and the other end of which is connected to the moving contact. The connecting conductor, the coil, the wire, the moving contact, and the stationary contact are connected in sequence to form a main circuit.

[0014] In an optional embodiment, the drive control mechanism includes a coil assembly, the interface of which is used to connect to an external power source and form a control loop, and the main loop and the control loop are isolated by an isolator.

[0015] In an optional embodiment, the drive mechanism further includes a second yoke and an armature, the armature being electromagnetically coupled to the second yoke, the second yoke being connected to the coil assembly, the armature being rotatably disposed in the housing, and the coil assembly being used to drive the armature to rotate via the second yoke when energized, so as to drive the moving contact to close or open with the stationary contact.

[0016] In an optional embodiment, the stationary contact is connected to the coil, the stationary contact and the protection mechanism are located on the same side of the moving contact, and the moving contact, the stationary contact, the coil, and the connecting conductor are connected in sequence to form a main circuit.

[0017] In an optional embodiment, the protection mechanism further includes a reset member disposed between the moving iron core and the stationary iron core. The reset member can be used to drive the moving iron core to reset to the position it was in when the moving contact and the stationary contact were closed.

[0018] In an optional embodiment, the end of the drive rod is provided with an end plate, which is located on the side of the moving contact closer to the stationary contact. The drive rod is used to pull the moving contact to rotate through the end plate, so as to cause the moving contact to disconnect from the stationary contact.

[0019] In an optional embodiment, the moving contact is rotatably disposed on the housing, and the protection mechanism, the moving contact, the stationary contact, and the drive control mechanism are arranged sequentially in the horizontal direction.

[0020] Secondly, this utility model provides an electricity meter whose housing includes a load switch as described in any of the foregoing embodiments.

[0021] The beneficial effects of the load switch and meter provided in this utility model embodiment include: the moving contact can be driven to move relative to the housing through the drive and control mechanism, thereby driving the moving contact to close or open with the stationary contact; when the circuit current is in a fault state such as a short circuit in the closed state, the protection mechanism directly acts on the moving contact and drives the moving contact to move away from the stationary contact, thereby realizing the rapid disconnection of the moving contact and the stationary contact, effectively improving the circuit breaking response speed in the event of a fault state such as a short circuit. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the load switch structure provided in this embodiment of the utility model;

[0024] Figure 2 A cross-sectional view of the protection mechanism provided in an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of the protection mechanism provided in an embodiment of this utility model.

[0026] Icons: 10-Load switch; 100-Stationary contact; 200-Moving contact; 300-Drive mechanism; 310-Coil assembly; 320-Second yoke; 330-Armature; 400-Protection mechanism; 410-Mounting component; 420-Stationary iron core; 430-Moving iron core; 440-Drive rod; 441-End plate; 450-Coil; 460-First yoke; 470-Reset component; 500-Connecting conductor; 600-Wire. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] To ensure electrical safety, load switches are usually not equipped with short-circuit protection devices. Instead, short-circuit protection is achieved through other products such as circuit breakers.

[0034] Based on the above issues, please refer to Figures 1 to 3This utility model embodiment provides a load switch 10, which is applied to electrical equipment, and is particularly suitable for devices such as electricity meters and relays. The load switch provided in this embodiment has a simple structure, low production cost, and can quickly drive the moving contact 200 to forcibly open the circuit breaker, thereby achieving tripping protection.

[0035] In detail, the load switch 10 includes a housing (not shown), a stationary contact 100, a moving contact 200, a drive mechanism 300, and a protection mechanism 400.

[0036] The stationary contact 100, the moving contact 200, the drive and control mechanism 300, and the protection mechanism 400 are all housed in the housing. The moving contact 200 is movably housed in the housing. The drive and control mechanism 300 is used to drive the moving contact 200 to close or open with the stationary contact 100. The protection mechanism 400 is used to drive the moving contact 200 to open with the stationary contact 100 when the moving contact 200 and the stationary contact 100 are closed, and when there is an abnormal current.

[0037] In this embodiment, the moving contact 200 can be driven to move relative to the housing by the drive control mechanism 300, thereby causing the moving contact 200 to close or open with the stationary contact 100. In the closed state, when the circuit current is under fault conditions such as short circuit, for example, when a short circuit current arrives, the protection mechanism 400 directly acts on the moving contact 200 and drives the moving contact 200 to move away from the stationary contact 100, thereby realizing the rapid disconnection of the moving contact 200 and the stationary contact 100, effectively improving the circuit breaking response speed under fault conditions such as short circuit.

[0038] As can be seen, the load switch 10 provided in this embodiment has a simple structure and fewer parts. While reducing production costs, it can also quickly disconnect in the event of faults such as short circuits, thus improving the safety performance of the load switch 10.

[0039] It should be noted that the moving contact 200 can be slidably mounted on the housing or rotated on the housing. That is, the moving contact 200 can be a direct-acting bridge structure or a rotating snap-fit ​​structure, which can be adjusted according to the actual product requirements. No specific limitation is made here. For ease of explanation, the following description will use the rotating snap-fit ​​type moving contact 200.

[0040] Furthermore, the protection mechanism 400 includes a mounting component 410, a stationary iron core 420, a moving iron core 430, and a drive rod 440. The stationary iron core 420 is disposed within the mounting component 410, and the moving iron core 430 is movably disposed within the mounting component 410. One end of the drive rod 440 is connected to the moving iron core 430, and the other end is connected to the moving contact 200. The stationary iron core 420 is used to drive the moving iron core 430 to move the drive rod 440, thereby causing the moving contact 200 to disconnect from the stationary contact 100.

[0041] In this embodiment, a magnetic field is generated around the moving iron core 430 and the stationary iron core 420 to make the moving iron core 430 and the stationary iron core 420 attract each other. The moving iron core 430 drives the drive rod 440 to move closer to or away from the stationary iron core 420. In this way, the drive rod 440 drives the moving contact 200 to move away from the stationary contact 100, thereby realizing the opening of the moving contact 200 and the stationary contact 100.

[0042] It is understood that the relative positions of the moving iron core 430 and the stationary iron core 420, and the moving contact 200 and the stationary contact 100, determine whether the drive rod 440 pushes the moving contact 200 away from the stationary contact 100, or pulls the moving contact 200 away from the stationary contact 100. For example, in this embodiment, as shown in the figure, the moving iron core 430 and the stationary iron core 420 are located on the left side of the moving contact 200, and the stationary contact 100 is located on the right side of the moving contact 200 (i.e., on different sides). Therefore, in order for the moving contact 200 to separate from the stationary contact 100, the drive rod 440 needs to pull the moving contact 200 to rotate in a direction away from the stationary contact 100 to the left. Of course, in other embodiments, the moving iron core 430, the stationary iron core 420, and the protection mechanism 400 can all be located on the same side of the moving contact 200, and adjustments can be made according to the specific spatial layout of the load switch.

[0043] It should be noted that the drive rod 440 is made of an insulating material, such as plastic.

[0044] Furthermore, the load switch 10 also includes a connecting conductor 500, and the protection mechanism 400 also includes a coil 450 and a first yoke 460. The coil 450 is sleeved on the outer wall of the mounting member 410 and is connected to the connecting conductor 500.

[0045] In this embodiment, in order to enable the moving iron core 430 and the stationary iron core 420 to move relative to each other under the action of a magnetic field, a coil 450 is also provided outside the mounting component 410, and the coil 450 is connected to the connecting conductor 500. When a fault such as a short circuit occurs in the circuit connected by the connecting conductor 500, the coil 450 generates a large current, thereby generating a magnetic field around the coil 450 when the current passes through it. This causes the stationary iron core 420 and the moving iron core 430 to generate a large attractive or repulsive force under the action of the magnetic field, enabling the moving iron core 430 to move relative to the stationary iron core 420. In turn, the moving iron core 430 drives the drive rod 440 to move, and the drive rod 440 drives the moving contact 200 to open the circuit with the stationary contact 100.

[0046] By placing the coil 450 at the U-shaped first yoke 460, a closed magnetic circuit is formed with the stationary iron core 420 and the moving iron core 430, allowing magnetic flux to flow smoothly throughout the entire magnetic circuit. This closed magnetic circuit effectively reduces magnetic resistance, improves circuit efficiency, and reduces energy loss. Furthermore, the first yoke 460 guides the magnetic flux generated by the coil 450, concentrating it more effectively through the stationary iron core 420 and the moving iron core 430, thus reducing magnetic leakage. This increases the magnetic density of the magnetic circuit, enhances the strength of the electromagnetic force, and consequently increases the driving force of the drive rod 440, enabling the moving contact 200 to quickly disconnect under the drive of the drive rod 440.

[0047] Specifically, in this embodiment, when the coil 450 is energized, the stationary iron core 420 and the moving iron core 430 generate an attraction, that is, the stationary iron core 420 attracts the moving iron core 430 to move toward the stationary iron core 420, so as to pull / push the moving contact 200 and the stationary contact 100 to open the circuit through the drive rod 440.

[0048] In detail, the end of the drive rod 440 is provided with an end plate 441, which is located on the side of the moving contact 200 close to the stationary contact 100. The drive rod 440 is used to pull the moving contact 200 to rotate through the end plate 441, so as to drive the moving contact 200 to open from the stationary contact 100.

[0049] In this embodiment, the end plate 441 is arranged perpendicular to the extension direction of the drive rod 440. Therefore, the end plate 441 is extended to the side of the moving contact 200 near the stationary contact 100, so that the moving contact 200 is pulled away from the stationary contact 100 under the drive of the moving iron core 430, thereby realizing the stable opening of the moving contact 200 and the stationary contact 100.

[0050] Furthermore, the stationary contact 100 is connected to the coil 450, and the stationary contact 100 and the protection mechanism 400 are located on the same side of the moving contact 200. The moving contact 200, the stationary contact 100, the coil 450, and the connecting conductor 500 are connected in sequence to form the main circuit. Therefore, in this arrangement, the moving contact 200 is pushed away from the stationary contact 100 by the driving mechanism 300 to achieve the tripping.

[0051] Furthermore, the protection mechanism 400 also includes a reset member 470, which is disposed between the moving iron core 430 and the stationary iron core 420. The reset member 470 is used to drive the moving iron core 430 to reset to the position where the moving contact 200 and the stationary contact 100 are closed.

[0052] In this embodiment, when the current in the circuit connected by the conductor 500 returns to normal, the magnetic field generated by the coil 450 decreases, and the attraction between the stationary iron core 420 and the moving iron core 430 decreases, so as to avoid the drive rod 440 still interfering with the moving contact 200 under this condition. Therefore, a reset member 470 is also provided between the moving iron core 430 and the stationary iron core 420 so that the drive rod 440 can be reset to the initial position through the reset member 470.

[0053] In detail, the reset element 470 is an elastic element, such as a spring. When the stationary iron core 420 attracts the moving iron core 430 to drive the drive rod 440 to pull the moving contact 200 and the stationary contact 100 to open the circuit, the moving iron core 430 also compresses the reset element 470. Therefore, after the current returns to normal, the attraction between the stationary iron core 420 and the moving iron core 430 will be less than the elastic restoring force generated after the reset element is deformed. The elastic restoring force generated by the reset element 470 drives the moving iron core 430 away from the stationary iron core 420, thereby driving the moving iron core 430 to reset to the initial position.

[0054] Furthermore, the load switch 10 also includes a wire 600, one end of which is connected to the coil 450 and the other end is connected to the moving contact 200. The connecting conductor 500, coil 450, wire 600, moving contact 200 and stationary contact 100 are connected in sequence to form the main circuit.

[0055] In this embodiment, the conductor 600 is a flexible connecting wire. By connecting one end of the conductor 600 to the coil 450 and the other end to the moving contact 200, a main circuit is formed by connecting the conductor 500, the coil 450, the conductor 600, the moving contact 200, and the stationary contact 100.

[0056] Furthermore, the drive and control mechanism 300 includes a coil assembly 310, the interface of which is used to connect to an external power supply and form a control loop, and the main loop and the control loop are isolated by an isolator (not shown).

[0057] In this embodiment, the drive control mechanism 300 includes a coil assembly, which is typically connected to an external power supply or other circuit components to form a control circuit for controlling the opening and closing of the moving contact 200 and the stationary contact 100. Therefore, in this embodiment, the main circuit and the control circuit are isolated by an isolator to isolate the strong and weak currents, so that the control of the secondary circuit under rated or low overload current will not be affected by the current of the main circuit, thus avoiding breakdown in the main circuit (strong current) and the control circuit (weak current).

[0058] Furthermore, the drive control mechanism 300 also includes a second yoke 320 and an armature 330. The armature 330 is electromagnetically coupled with the second yoke 320. The second yoke 320 is connected to the coil assembly 310. The armature 330 is rotatably mounted on the housing. The coil assembly 310 is used to drive the armature 330 to rotate through the second yoke 320 when energized, so as to drive the moving contact 200 to close or open with the stationary contact 100.

[0059] It is understandable that there are two second yokes of type 320.

[0060] Furthermore, the protection mechanism 400 can be installed at the inlet or outlet of the load switch 10.

[0061] For example, in some embodiments of the present invention, the protection mechanism 400 may be located near the inlet end of the stationary contact 100, or in other embodiments of the present invention, the protection mechanism 400 may also be located near the outlet end of the moving contact 200; that is, as shown in the figure, the protection mechanism 400 may be located on the left or upper side of the moving contact 200.

[0062] Furthermore, the protection mechanism 400, moving contact 200, stationary contact 100, and drive and control mechanism 300 are arranged sequentially in the horizontal direction.

[0063] In this embodiment, it should first be noted that the horizontal direction in which the protection mechanism 400, moving contact 200, stationary contact 100 and drive control mechanism 300 are arranged in the horizontal direction refers to the horizontal direction of the load switch 10 in the installed state. In this case, the protection mechanism 400, moving contact 200, stationary contact 100 and drive control mechanism 300 are arranged in the horizontal direction from left to right in the housing, so that the internal layout of the load switch 10 is reasonable and easy to assemble.

[0064] In summary, this utility model provides a load switch 10, which can drive the moving contact 200 to move relative to the housing through the drive and control mechanism 300, thereby causing the moving contact 200 to close or open with the stationary contact 100; when the circuit current is in a fault state such as a short circuit in the closed state, the protection mechanism 400 directly acts on the moving contact 200 and drives the moving contact 200 to move away from the stationary contact 100, thereby realizing the rapid disconnection of the moving contact 200 and the stationary contact 100, effectively improving the circuit breaking response speed in the event of a fault state such as a short circuit.

[0065] Furthermore, this utility model embodiment also provides an electricity meter, including the load switch 10 in the above embodiments.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A load switch (10), characterized in that, include: case; A stationary contact (100) is disposed in the housing; A movable contact (200) is movably disposed in the housing; A drive control mechanism (300) is disposed in the housing and is used to drive the moving contact (200) and the stationary contact (100) to close or open. A protection mechanism (400) is disposed in the housing. The protection mechanism (400) is used to drive the moving contact (200) and the stationary contact (100) to open when the moving contact (200) and the stationary contact (100) are closed, and when a short circuit current occurs.

2. The load switch (10) according to claim 1, characterized in that, The load switch (10) further includes a connecting conductor (500). The protection mechanism (400) includes a mounting component (410), a stationary iron core (420), a moving iron core (430), a drive rod (440), a coil (450), and a first yoke (460). The stationary iron core (420) is disposed inside the mounting component (410). The moving iron core (430) is movably disposed on the mounting component (410). One end of the drive rod (440) is connected to the moving iron core (430), and the other end is disposed at the moving contact (200). The coil (450) is sleeved on the outside of the mounting component (410) and connected to the connecting conductor (500). The coil (450) is also disposed on the first yoke (460). The stationary iron core (420) is used to generate electromagnetic force when the coil (450) is energized, so as to drive the moving iron core (430) to drive the driving rod (440) to move, so as to drive the moving contact (200) to open the circuit with the stationary contact (100).

3. The load switch (10) according to claim 2, characterized in that, The load switch (10) also includes a wire (600), one end of which is connected to the coil (450) and the other end is connected to the moving contact (200). The connecting conductor (500), the coil (450), the wire (600), the moving contact (200), and the stationary contact (100) are connected in sequence to form a main circuit.

4. The load switch (10) according to claim 3, characterized in that, The drive and control mechanism (300) includes a coil assembly (310), the interface of which is used to connect to an external power source and form a control loop, and the main loop and the control loop are isolated by an isolator.

5. The load switch (10) according to claim 4, characterized in that, The drive control mechanism (300) further includes a second yoke (320) and an armature (330). The armature (330) is electromagnetically coupled to the second yoke (320). The second yoke (320) is connected to the coil assembly (310). The armature (330) is rotatably disposed on the housing. The coil assembly (310) is used to drive the armature (330) to rotate through the second yoke (320) when energized, so as to drive the moving contact (200) to close or open with the stationary contact (100).

6. The load switch (10) according to claim 2, characterized in that, The stationary contact (100) is connected to the coil (450). The stationary contact (100) and the protection mechanism (400) are located on the same side of the moving contact (200). The moving contact (200), the stationary contact (100), the coil (450), and the connecting conductor (500) are connected in sequence to form a main circuit.

7. The load switch (10) according to claim 2, characterized in that, The protection mechanism (400) further includes a reset member (470), which is disposed between the moving iron core (430) and the stationary iron core (420). The reset member (470) can be used to drive the moving iron core (430) to reset to the position when the moving contact (200) and the stationary contact (100) are in the closed state.

8. The load switch (10) according to claim 2, characterized in that, The end of the drive rod (440) is provided with an end plate (441), which is located on the side of the moving contact (200) close to the stationary contact (100). The drive rod (440) is used to pull the moving contact (200) to rotate through the end plate (441) so as to drive the moving contact (200) to open from the stationary contact (100).

9. The load switch (10) according to any one of claims 1-8, characterized in that, The moving contact (200) is rotatably disposed on the housing, and the protection mechanism (400), the moving contact (200), the stationary contact (100) and the drive control mechanism (300) are arranged sequentially in the horizontal direction.

10. An electricity meter, characterized in that, Its housing includes a load switch (10) as described in any one of claims 1-9.

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