Load switch and ammeter

Abstract

The invention provides a load switch and an electric meter, and relates to the technical field of low-voltage electrics. A magnetic system, a contact mechanism and an arc extinguish chamber are arranged in the load switch; the contact mechanism comprises a contact support, a moving contact and a static contact, the contact support is connected with the magnetic system, and the moving contact is connected with the contact support; one end of the moving contact is connected with a rotating assembly, and the other end of the moving contact is provided with a moving contact which abuts against the static contact of the static contact. The magnetic system and the contact support are arranged in the first direction, the arc extinguish chamber and the static contact are arranged in the first direction, and the magnetic system, the contact support, the arc extinguish chamber and the static contact are arranged in the second direction, so that the load switch is reasonable in space layout and compact in structure, the occupied space is effectively reduced, assembly is convenient, and good applicability is achieved.

Description

[0001] This application is a divisional application of the Chinese patent application with the application date of February 8, 2024, application number "202410177221X", and invention name "A Kind of Electric Meter". Technical Field

[0002] The present invention relates to the field of low-voltage electrical technology, and in particular to a load switch and an electric meter. Background Art

[0003] Load switches are a key component of today's smart meters. They utilize the interaction between an electromagnetic coil and a permanent magnet under the influence of a drive control signal to close or open the contact mechanism. The load switch remains in the on / off state even after the drive control signal disappears.

[0004] However, existing load switch designs often have problems such as unreasonable spatial layout and loose structure, resulting in a large overall size of the equipment and difficulty in efficient integration with other components. This is not only inconvenient to assemble, but also limits its applicability in compact devices and limited space application scenarios. Summary of the Invention

[0005] The present invention provides a load switch and an electric meter, which have a reasonable spatial layout and a compact structure, effectively reduce the occupied space, are convenient for assembly, and have good applicability.

[0006] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a load switch, wherein a magnetic system, a contact mechanism, and an arc extinguishing chamber are provided inside the load switch; The contact mechanism includes a contact bracket, a movable contact and a static contact, wherein the contact bracket is connected to the magnetic system, and the movable contact is connected to the contact bracket; one end of the movable contact is connected to a rotating assembly, and the other end is provided with a movable contact that contacts the static contact of the static contact; The magnetic system and the contact support are arranged along a first direction, the arc extinguishing chamber and the static contact are arranged along the first direction, and the magnetic system and the contact support, the arc extinguishing chamber and the static contact are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0007] In an optional embodiment, the axis of the coil of the magnetic system extends along the second direction.

[0008] In an optional embodiment, a first magnetizing block is further provided inside the load switch, the first magnetizing block is provided on one side of the static contact, and the moving contact is provided between the first magnetizing block and the magnetic system; a second magnetizing block is provided at a corresponding position on the moving contact, and the second magnetizing block corresponds to the position of the first magnetizing block.

[0009] In an optional embodiment, there are at least two moving contacts, one end of each moving contact is connected to the rotating assembly, and the other end is provided with a moving contact point that can be in contact with the static contact.

[0010] In an optional embodiment, the magnetic system is used to drive the moving contact to move around the rotation axis of the rotating assembly, so that the moving contact contacts or separates from the static contact on the static contact.

[0011] In an optional embodiment, the arc extinguishing chamber is located on one side of the contact or separation position between the moving contact and the static contact of the contact mechanism.

[0012] In an optional embodiment, the moving contact is connected to the contact bracket via an elastic member. When the driving rod of the magnetic system pushes the moving contact to contact the static contact, the elastic member can generate an elastic force that drives the moving contact to resist the static contact on the static contact.

[0013] In an optional embodiment, the load switch also includes a conductive member connected to the moving contact, one end of the conductive member is connected to the end of the moving contact away from the moving contact point, and the other end is connected to the wiring port, and multiple moving contacts are connected in series or in parallel through the conductive member.

[0014] In an optional embodiment, there are plural conductive members and plural movable contacts, and the conductive members are connected to the movable contacts in a one-to-one correspondence.

[0015] In a second aspect, the present invention provides an electric meter comprising a load switch as described in any one of the aforementioned embodiments.

[0016] The load switch and electric meter provided by the embodiments of the present invention have the following beneficial effects: by arranging the magnetic system and contact bracket along a first direction, the arc extinguishing chamber and static contact along a first direction, and the magnetic system and contact bracket, the arc extinguishing chamber and static contact along a second direction, the overall structural design of the load switch is optimized, making the spatial layout more reasonable and the structure more compact, effectively reducing the space occupied by the equipment; not only improving space utilization, but also simplifying the assembly process, improving production efficiency and assembly reliability. At the same time, the compact layout makes the load switch easier to integrate with other electrical components, enhancing the overall coordination and applicability of the system, thereby meeting the needs of modern power distribution systems for miniaturization and modularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 One of the structural schematic diagrams of the electric meter provided in an embodiment of the present invention; Figure 2 The second structural diagram of the electric meter provided by the embodiment of the present invention; Figure 3 The third structural diagram of the electric meter provided by the embodiment of the present invention; Figure 4 One of the structural diagrams of the load switch provided in an embodiment of the present invention; Figure 5 The second structural diagram of the load switch provided by the embodiment of the present invention; Figure 6 This is a fourth structural diagram of an electric meter provided in an embodiment of the present invention.

[0019] Icons: 100-electricity meter; 110-housing; 120-load switch; 121-housing; 122-magnetic system; 123-contact mechanism; 1231-contact bracket; 1232-moving contact; 1233-static contact; 1234-first magnetizing block; 1235-second magnetizing block; 1236-bending portion; 1237-rotating assembly; 1238-elastic member; 124-arc extinguishing chamber; 130-wiring port; 131-first wiring port; 132-second wiring port; 133-third wiring port; 134-fourth wiring port; 140-conductive member; 150-current detection device; 160-PCB board; 170-first wiring member; 180-second wiring member. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] 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 invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it 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 rather that it can be slightly tilted.

[0025] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] Please refer to Figure 1 、 Figure 2 and Figure 3This embodiment provides an electric meter 100, including a housing 110, a load switch 120 and a wiring port 130; the load switch 120 is arranged in the housing 110, and the wiring port 130 is arranged on one side of the housing 110. A magnetic system 122 and a contact mechanism 123 are provided inside the load switch 120, and the movement direction of the moving iron core of the magnetic system 122 is perpendicular to the setting side direction of the wiring port 130 on the housing 110; the contact mechanism 123 is arranged between the magnetic system 122 and the wiring port 130, and is respectively connected to the magnetic system 122 and the wiring port 130.

[0027] Specifically, the present application provides an electric meter 100 , which includes a housing 110 , a load switch 120 disposed in the housing 110 , and a wiring port 130 disposed at an end of the housing 110 , which is used for connecting to an external circuit.

[0028] Load switch 120 includes a housing 121, within which a magnetic system 122 is housed. The movable iron core of magnetic system 122 is capable of vertical movement due to the interaction between the electromagnetic coil and the permanent magnet. A contact mechanism 123 is disposed between magnetic system 122 and a wiring port 130, connected to both. Magnetic system 122 is capable of vertical movement, driving contact 1232 into or out of contact, thereby connecting or disconnecting the electrical circuit.

[0029] It should be noted that, first, the movement direction of the moving iron core of the magnetic system 122 of the present application is perpendicular to the setting side direction of the wiring port 130 on the housing 110, wherein the setting side direction of the wiring port 130, that is, the arrangement direction of the first wiring port 131 to the fourth wiring port 134, can reduce the influence of the magnetic field outside the electric meter 100 on the load switch 120, thereby making the process of the contact mechanism contacting or separating with the magnetic system 122 more stable and reliable.

[0030] Second, the contact mechanism 123 of the present application is disposed between the magnetic system 122 and the wiring port 130. On the one hand, the contact mechanism 123 is connected to the magnetic system 122 so that the magnetic system 122 drives the movement of the contact 1232 mechanism to bring the movable contact 1232 into contact or separate from the stationary contact 1233. On the other hand, the contact mechanism 123 must be connected to the wiring port 130 to ensure connectivity of the electrical circuit of the electricity meter 100. Placing the contact mechanism 123 between the magnetic system 122 and the wiring port 130 simplifies and streamlines the wiring process between the load switch 120 and the electricity meter 100, while also shortening the connecting wire loop, which helps reduce line resistance and, consequently, lowers temperature rise and energy consumption in the electrical circuit of the electricity meter 100.

[0031] The present application provides an electric meter 100, comprising a housing 110, a load switch 120, and a wiring port 130; the load switch 120 is disposed within the housing 110, the wiring port 130 is disposed on one side of the housing 110, and a magnetic system 122 and a contact mechanism 123 are disposed within the load switch 120. The movement direction of the moving iron core of the magnetic system 122 is perpendicular to the direction of the side of the housing 110 where the wiring port 130 is disposed; the contact mechanism 123 is disposed between the magnetic system 122 and the wiring port 130, and is connected to the magnetic system 122 and the wiring port 130, respectively. The electric meter 100 obtained by the above design, through its sophisticated layout, can enhance the load switch 120's ability to resist strong magnetic interference, while also making the wiring between the load switch 120 and the electric meter 100 simpler and more reasonable, shortening the conductive loop, and reducing line resistance.

[0032] In one possible embodiment of the present application, Figure 4 As shown, the electric meter 100 further includes an arc extinguishing chamber 124 and a current detection device 150 . The arc extinguishing chamber 124 is disposed in the load switch 120 , and the current detection device 150 is disposed outside the housing 121 of the load switch 120 .

[0033] Furthermore, the arc extinguishing chamber 124 is located on a side of the load switch 120 close to the current detection device 150 .

[0034] Specifically, the electric meter 100 also includes an arc extinguishing chamber 124, which is arranged in the load switch 120 and on the left or right side of the magnetic system 122. Its specific setting position should correspond to the position of the contact point of the contact mechanism 123 to ensure that when the moving contact 1232 of the contact mechanism 123 contacts or separates from the static contact 1233, the generated arc can enter the arc extinguishing chamber 124 and extinguish the arc, thereby playing a certain protective role for the load switch 120 and the electric meter 100.

[0035] Furthermore, the contact mechanism 123 includes a contact bracket 1231, a movable contact 1232, and a stationary contact 1233. The contact bracket 1231 is connected to the magnetic system 122, and the movable contact 1232 is connected to the contact bracket 1231. The magnetic system 122 can drive the contact bracket 1231 and the movable contact 1232 to move toward the stationary contact 1233, so that the movable contact 1232 contacts the stationary contact 1233. The stationary contact 1233 can be arranged on the side of the movable contact 1232 away from or close to the magnetic system 122, and can be adjusted according to actual layout requirements, which is not limited here.

[0036] Specifically, if Figure 4 and Figure 5As shown, the contact mechanism 123 includes a contact bracket 1231, one end of which is connected to the magnetic system 122. The magnetic system 122 can move vertically, thereby driving the contact bracket 1231 to move up and down in the vertical direction. The contact mechanism 123 also includes a movable contact 1232 and a stationary contact 1233. The movable contact 1232 is disposed on the contact bracket 1231, and the contact bracket 1231 can drive the movable contact 1232 to move vertically. The stationary contact 1233 is disposed on the side of the movable contact 1232 near the wiring port 130 and is positioned to match the position of the movable contact 1232. When the contact bracket 1231 drives the movable contact 1232 to move downward, it can contact the stationary contact 1233, thereby achieving circuit conduction.

[0037] In this embodiment, the magnetic system 122 and the contact support 1231 are arranged along the first direction, the arc extinguishing chamber 124 and the static contact 1233 are arranged along the first direction, and the magnetic system 122 and the contact support 1231, the arc extinguishing chamber 124 and the static contact 1233 are arranged along the second direction.

[0038] The first direction is perpendicular to the second direction. The first direction is the X direction as shown in the figure, and the second direction is the Y direction as shown in the figure.

[0039] In other words, the magnetic system 122 and the contact bracket 1231 are located on one side of the housing 121 of the load switch 120, and the arc extinguishing chamber 124 and the static contact 1233 are located on the other side of the housing 121 of the load switch 120. This optimizes the overall structural design of the load switch 120, making the spatial layout more reasonable and the structure more compact, effectively reducing the space occupied by the equipment, and facilitating its application in limited installation spaces. This structure not only improves space utilization, but also simplifies the assembly process, improves production efficiency and assembly reliability. At the same time, the compact layout makes the load switch easier to integrate with other electrical components, enhancing the overall coordination and applicability of the system. In addition, this structural design helps to improve the product's protection performance and operational stability, meet the needs of modern power distribution systems for miniaturization and modular development, and has good prospects for promotion and application.

[0040] It should also be noted that the axis of the coil in the magnetic system 122 extends along the second direction.

[0041] Furthermore, the wiring port 130 includes at least a first wiring port 131 and a second wiring port 132; the moving contact 1232 is connected to the first wiring port 131 through the first wiring member 170, and the static contact 1233 is connected to the second wiring port 132 through the second wiring member 180; or, the moving contact 1232 is connected to the second wiring port 132 through the second wiring member 180, and the static contact 1233 is connected to the first wiring port 131 through the first wiring member 170; a manganese copper plate is provided on the first wiring member 170.

[0042] A manganese copper plate is provided on the first terminal 170 for current sampling by detecting the voltage of the terminal 130 to which the manganese copper plate is connected. Furthermore, the electric meter 100 also includes a current detection device 150. The terminal 130 also includes a third terminal 133 and a fourth terminal 134. The current detection device 150 is disposed adjacent to the contact mechanism 123 of the load switch 120 and is located near the third terminal 133. The second terminal 180 is connected to the second terminal 132 after passing through the current detection device 150 via the conductive member 140. The second terminal 180 can be integrally formed with the conductive member 140 or can be designed separately. Furthermore, the second terminal 180 and the conductive member 140 can be integrally formed with the movable contact 1232 / static contact 1233, i.e., the movable contact 1232 / static contact 1233 directly extend outward through the current detection device 150 to electrically connect to the second terminal 132.

[0043] Specifically, in a preferred embodiment of the present invention, the current detection device 150 is positioned adjacent to the contact mechanism 123 of the load switch 120 and located near the third wiring port 133 to further reduce wiring length, making the connection process simpler and more efficient. The current flowing through the static contact 1233 and the movable contact 1232 in the load switch 120 passes through the middle of the current detection device 150 and then electrically connects to the second wiring port 132. Simultaneously, utilizing the electrical connection between the third wiring port 133 and the fourth wiring port 134, and with the current flowing in the opposite direction to the current flowing through the static contact 1233 or the movable contact 1232, two circuits pass through the current detection device 150 to detect power theft and leakage. Under normal circumstances, at the same time, the two circuits passing through the center of the current detection device 150 have currents flowing in opposite directions and of equal magnitude, resulting in the sum of the magnetic flux in the current detection device 150 being approximately zero. However, when a line fault occurs, the two currents differ in magnitude, and the sum of the magnetic flux in the current detection device 150 is non-zero.

[0044] Furthermore, in order to make the conductive loop shorter, the current detection device 150 can be as follows Figure 2 The third connection port 133 and the fourth connection port 134 can also be located as shown in FIG. Figure 6That is located at the second connection port 132 and the third connection port 133.

[0045] Furthermore, the current detection device 150 is arranged on the side edge of the shell 121 of the load switch 120, and the current detection device 150 is arranged on the side of the static contact 1233 close to the contact mechanism 123, the arc extinguishing chamber 124 and the current detection device 150 are located on the same side of the magnetic system 122 of the load switch 120, and one end of the static contact 1233 extends to the outside of the shell 121 of the load switch 120, and passes through the current detection device 150 to be connected to the second wiring port 132 to form a circuit conduction. In this embodiment, the static contact 1233 is integrally formed with the second wiring member 180 and the conductive member 140, and the extended part acts as the second wiring member 180 to electrically connect the second wiring port 132. Of course, it can also be designed separately in other embodiments.

[0046] Through such an arrangement, first, the arc extinguishing chamber 124 and the current detection device 150 are located on the same side of the magnetic system 122 of the load switch 120, so that the space between the load switch 120 and the current detection device 150 is fully utilized, that is, the width of the load switch 120 can be close to and extend toward the current detection device 150 to a certain extent. At this time, the space of the load switch 120 is expanded, and the structural design of the arc extinguishing chamber is relatively flexible, which can fully utilize this part of the expanded space; second, the static contact 1233 or the moving contact 1232 needs to be connected to the second wiring port 132, and the circuit also passes through the current detection device 150 for easy detection. Directly connecting the static contact 1233 to the second wiring port 132 also makes the connection between the static contact 1233 and the wiring port 130 of the electric meter 100 more convenient, making the wiring process of the load switch 120 and the current detection device 150 simpler and more reasonable, while shortening the connecting wire loop, which is conducive to reducing the line resistance, thereby improving the reliability of the electrical circuit of the electric meter 100.

[0047] Preferably, the first terminal 170 is located on a side of the load switch away from the current detection device, so that the spatial arrangement of the first terminal 170 is less restricted, and in particular, the design and layout of the manganese copper plate in the first terminal 170 are facilitated. The first terminal 170 is electrically connected to the first connection port 131 via the conductive member 140. The first terminal 170 and the conductive member 140 can be integrally formed or provided separately, which is not limited here.

[0048] The conductive member 140 can be connected to the PCB 160 through the housing 121 of the load switch, thereby ensuring electrical continuity. This connection method improves space utilization within the electric meter 100 and provides a more rational and orderly layout. Specifically, the current detection device 150 is a mutual inductor.

[0049] In one possible embodiment of the present application, at least two moving contacts 1232 are provided, one end of each moving contact 1232 is connected to the rotating assembly 1237, and the other end is provided with a moving contact that can be in contact with the static contact 1233; the movement direction of the moving iron core of the magnetic system 122 is consistent with the movement direction of the contact bracket 1231, making the overall spatial layout of the load switch 120 more compact. Of course, in other embodiments, the driving direction of the magnetic system 122 can also be perpendicular to the movement direction of the contact bracket 1231, which is not limited here. The magnetic system 122 is used to drive the moving contact 1232 to move around the rotation axis of the rotating assembly 1237, so that the moving contact contacts or separates from the static contact 1233. The moving contact 1232 and the static contact 1233 are provided with a contact point at only one end, which is conducive to reducing the number of contacts and can reduce manufacturing costs.

[0050] Specifically, a plurality of moving contacts 1232 can be provided, and the plurality of moving contacts 1232 are arranged at intervals along the thickness direction of the load switch 120. One end of the moving contact 1232 is connected to a rotating component 1237, and the other end is provided with a moving contact that can be in contact with the static contact of the static contact 1233; preferably, the rotating component 1237 is a rotating shaft hinged on the shell 121 of the load switch 120, and the moving contact 1232 can rotate along the rotating component 1237. When the contact bracket 1231 drives the moving contact 1232 to move in the vertical direction, it drives the end of the moving contact 1232 with the moving contact to rotate around the rotating shaft, which can make the moving contact contact or separate from the static contact 1233. The rotating component 1237 makes the process of rotating the moving contact 1232 toward the static contact 1233 more stable and reliable.

[0051] Furthermore, an elastic member 1238 is provided on the rotating assembly 1237, and the moving contact 1232 is connected to the contact bracket 1231 through the elastic member 1238. When the driving rod of the magnetic system 122 pushes the moving contact to contact the static contact 1233, the elastic member 1238 can generate an elastic force that drives the moving contact to resist the static contact on the static contact 1233.

[0052] Furthermore, the electric meter 100 is further provided with a conductive member 140 connected to the movable contact 1232. One end of the conductive member 140 is connected to one end of the movable contact 1232, and the other end is connected to the wiring port 130. Multiple movable contacts 1232 are connected in series or in parallel via the conductive member 140. In this embodiment, the conductive member 140 is a flexible connector, and the movable contact 1232 is connected to the first wiring member 170 / the second wiring member 180 via the flexible connector, thereby achieving electrical connection between the movable contact 1232 and the wiring port 130 of the electric meter 100. The parallel connection of multiple movable contacts 1232 can shun current, reducing the current at the movable contact point. Compared to a single movable contact 1232, the heat dissipation area of ​​multiple movable contacts 1232 is increased, which helps improve the thermal stability of the movable contact 1232 and prevent the movable contact 1232 from overheating. Furthermore, the parallel arrangement allows each moving contact 1232 to carry a portion of the current, significantly reducing the repulsive force between the moving contact 1232 and the stationary contact 1233, thereby facilitating stable contact between the moving and stationary contacts. The series arrangement, on the other hand, creates multiple breakpoints in the current loop. Compared to a single breakpoint, the separation distance between the moving contacts 1232 is multiplied, significantly improving dielectric properties. The arc is also divided into multiple segments, increasing the overall arc voltage and significantly enhancing arc extinguishing effectiveness.

[0053] In this embodiment, there are multiple conductive members 140 and multiple movable contacts 1232, and the multiple conductive members 140 are connected in a one-to-one correspondence with the multiple movable contacts 1232. For example, there are two conductive members 140 and two movable contacts 1232.

[0054] Furthermore, if Figure 5 As shown, a bending portion 1236 is provided at one end of the moving contact 1232 close to the arc extinguishing chamber 124 . The bending portion 1236 is bent in a direction toward the arc extinguishing chamber 124 to be close to the arc entrance of the arc extinguishing chamber 124 .

[0055] By providing a bending portion 1236 at one end of the moving contact 1232 close to the arc extinguishing chamber 124, the bent end of the moving contact 1232 plate is opposite to the arc entrance of the arc extinguishing chamber 124, so that the arc can enter the arc extinguishing chamber 124 from the bent portion 1236 of the moving contact 1232 and be extinguished. The bending of the moving contact 1232 can reduce the repulsive force arm, thereby reducing the repulsive torque, thereby improving the short-circuit current resistance capability.

[0056] In a preferred embodiment of the present application, a first magnetizing block 1234 is further provided at the end of the load switch 120. The first magnetizing block 1234 is placed on one side of the static contact 1233, and the moving contact 1232 is arranged between the first magnetizing block 1234 and the magnetic system 122; a second magnetizing block 1235 is provided at the corresponding position of the moving contact 1232, and the second magnetizing block 1235 corresponds to the position of the first magnetizing block 1234.

[0057] Specifically, a first magnetizing block 1234 is provided on the side of the load switch 120 close to the static contact 1233, and the first magnetizing block 1234 is provided on the periphery of the static contact 1233. The moving contact 1232 is located between the first magnetizing block 1234 and the magnetic system 122; correspondingly, a second magnetizing block 1235 is sleeved on the moving contact 1232. When the moving and static contacts are in contact, the current in the moving contact 1232 will generate a circular magnetic field, and the magnetic field forms a magnetic flux path through the first magnetizing block 1234 and the second magnetizing block 1235. The magnetic flux causes the first magnetizing block 1234 and the second magnetizing block 1235 to generate an electromagnetic force that attracts each other. Generally speaking, the greater the current, the greater the electromagnetic force between the first and second magnetizing blocks, thereby enhancing the contact system's ability to withstand large short-circuit currents.

[0058] In a preferred embodiment of the present application, in order to further weaken the external magnetic source and its influence on the magnetic system 122, a shielding plate is provided on each side of the magnetic system, and a plurality of shielding plates enclose a receiving cavity. The magnetic system is arranged in the receiving cavity, and an air gap is formed between at least one of the shielding plates and the other shielding plates. The provision of the shielding plate not only provides a certain degree of protection for the magnetic system, but also the provision of the air gap prevents the magnetic system 122 from being magnetically short-circuited while providing magnetic shielding, thereby further reducing the interference of the magnetic field outside the meter on the load switch. At the same time, directly enclosing and magnetically shielding only the magnetic system 122 improves the shielding effect, reduces costs, and further reduces the overall size of the load switch 120, making it easier to install it in the meter 100.

[0059] Furthermore, in order to ensure that the external magnetic field does not interfere with the magnetic system 122 while it can normally drive the moving contact 1232 and prevent magnetic short circuit, air gaps are provided on both shielding plates along the thickness direction of the meter, and the air gap on each shielding plate is larger than the movement stroke of the moving iron core in the magnetic system 122.

[0060] In one embodiment of the present application, Figure 2 and Figure 3 As shown, the electric meter 100 further includes a PCB 160. The load switch 120 and the current detection device 150 are disposed on a surface of the PCB 160. The end of the conductive member 140 away from the bent portion 1236 is connected to the PCB 160 via the housing 121 of the negative pressure switch. The arrangement of the PCB 160 ensures the normal operation of the various components of the electric meter 100.

[0061] The foregoing description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0062] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A load switch, characterized in that: The load switch (120) is internally provided with a magnetic system (122), a contact mechanism (123) and an arc extinguishing chamber (124); The contact mechanism (123) comprises a contact support (1231), a movable contact (1232) and a stationary contact (1233); the contact support (1231) is connected to the magnetic system (122), and the movable contact (1232) is connected to the contact support (1231); one end of the movable contact is connected to a rotating assembly, and the other end is provided with a movable contact that contacts the stationary contact of the stationary contact; The magnetic system (122) and the contact support (1231) are arranged along a first direction, the arc extinguishing chamber (124) and the static contact (1233) are arranged along the first direction, and the magnetic system (122) and the contact support (1231), the arc extinguishing chamber (124) and the static contact (1233) are arranged along a second direction, and the first direction is perpendicular to the second direction.

2. The load switch according to claim 1, characterized in that: The axes of the coils of the magnetic system (122) extend along the second direction.

3. The load switch according to claim 1, characterized in that: A first magnetizing block (1234) is further provided inside the load switch (120), the first magnetizing block (1234) being provided on one side of the static contact (1233), and the moving contact (1232) being provided between the first magnetizing block (1234) and the magnetic system (122); a second magnetizing block (1235) is sleeved on a corresponding position on the moving contact (1232), the second magnetizing block (1235) corresponding in position to the first magnetizing block (1234).

4. The load switch according to claim 1, characterized in that: At least two movable contacts (1232) are provided, one end of each movable contact (1232) is connected to the rotating assembly (1237), and the other end is provided with a movable contact point capable of abutting against the static contact (1233).

5. The load switch according to claim 1, characterized in that: The magnetic system (122) is used to drive the moving contact (1232) to move around the rotation axis of the rotating assembly (1237), so that the moving contact contacts or separates from the static contact on the static contact (1233).

6. The load switch according to claim 1, characterized in that: The arc extinguishing chamber (124) is located on one side of the contact mechanism (123) where the moving contact and the static contact are in contact or separated.

7. The load switch according to claim 1, characterized in that: The moving contact (1232) is connected to the contact bracket (1231) via an elastic member (1238). When the driving rod of the magnetic system (122) pushes the moving contact to contact the static contact (1233), the elastic member (1238) can generate an elastic force that drives the moving contact to press against the static contact on the static contact (1233).

8. The load switch according to claim 1, characterized in that: The load switch further comprises a conductive member (140) connected to the moving contact (1232); one end of the conductive member (140) is connected to an end of the moving contact (1232) away from the moving contact point, and the other end is connected to the wiring port (130); a plurality of the moving contacts (1232) are connected in series or in parallel via the conductive member (140).

9. The load switch according to claim 8, characterized in that: The number of the conductive members (140) and the number of the movable contacts (1232) are both multiple, and the multiple conductive members (140) and the multiple movable contacts (1232) are connected in a one-to-one correspondence.

10. An electric meter, characterized in that: The invention comprises a load switch as described in any one of claims 1 to 9.

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