Load switch and ammeter

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to a load switch and an electric meter, which comprise a mounting shell, an electromagnetic driving mechanism and a contact assembly, the electromagnetic driving mechanism and the contact assembly are arranged in the mounting shell along a first direction and are close to each other; the contact assembly comprises a moving contact and a static contact. The rotating armature assembly is connected with one end of the moving contact, and the electromagnetic coil drives the moving contact to rotate through the rotating armature assembly, so that the other end of the moving contact and the static contact are switched on and switched off. The moving contact and the static contact have at least one switching-on position, and the projection of the electromagnetic driving mechanism in the first direction covers the switching-on position. By improving the structural layout of the load switch, the size of the load switch can be effectively reduced, and the miniaturization design of the load switch can be realized.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a load switch and an electricity meter. Background Technology

[0002] A load switch can interrupt the rated load current and a certain overload current. It achieves closing or opening of the circuit through the contact or separation of its internal moving and stationary contacts. The electricity meter contains a PCB board for data exchange with external devices. Furthermore, to ensure accurate and stable energy measurement, the meter typically requires numerous components such as transformers, MCUs, and capacitors, significantly limiting the space available for the load switch. Therefore, load switches are increasingly being miniaturized. In existing technologies, on the one hand, complex transmission structures such as push-locks or gear drives are used to move the moving contacts, requiring considerable assembly space. On the other hand, the overall structural layout of existing load switches is not compact enough, resulting in a large overall size. This leads to a significant space requirement when the load switch is installed inside the electricity meter, hindering miniaturization design. Utility Model Content

[0003] The purpose of this application is to provide a load switch and an electricity meter, which can effectively reduce the size of the load switch by improving the structural layout of the load switch, thus facilitating the miniaturization design of the load switch.

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

[0005] In a first aspect, embodiments of this application provide a load switch, including a mounting housing, an electromagnetic drive mechanism, and a contact assembly; the electromagnetic drive mechanism and the contact assembly are arranged along a first direction and close to each other within the mounting housing; the electromagnetic drive mechanism includes an electromagnetic coil, a yoke assembly, and a rotating armature assembly; the contact assembly includes a moving contact and a stationary contact; the rotating armature assembly is connected to one end of the moving contact, and the electromagnetic coil drives the moving contact to rotate through the rotating armature assembly, so that the other end of the moving contact is closed or opened with the stationary contact; the moving contact and the stationary contact have at least one closed position, and the projection of the electromagnetic drive mechanism along the first direction covers at least one of the closed positions.

[0006] As an optional implementation, the contact assembly includes a moving contact mounting base, and a connecting rod structure is provided between the rotating armature assembly and the moving contact mounting base; the rotating armature assembly is provided with a connecting part that is rotatably connected to the connecting rod structure, and the moving contact mounting base is rotatably connected to the connecting rod structure; the connecting part, the connecting rod structure, and the moving contact mounting base constitute a four-bar linkage mechanism, and the electromagnetic drive mechanism drives the moving contact and the stationary contact to open and close the circuit through the four-bar linkage mechanism.

[0007] As an optional implementation, the connecting part, the linkage structure, and the moving contact mounting base form a U-shaped structure with the opening facing the electromagnetic drive mechanism.

[0008] As an optional implementation, the yoke assembly includes a first yoke and a second yoke arranged along a first direction, and the rotating armature assembly and the electromagnetic coil are arranged along a second direction; the first direction is perpendicular to the second direction.

[0009] As an optional implementation, the moving contact mounting base is provided with a plurality of moving contacts, which are arranged along a third direction; wherein the first direction, the second direction, and the third direction are perpendicular to each other; and a rotating shaft connected to the mounting housing passes through the moving contact mounting base and the moving contacts.

[0010] As an optional implementation, an elastic element is provided between the moving contact mounting base and the moving contact, and the elastic element is compressed to generate a force that causes the moving contact to move closer to the stationary contact.

[0011] As an optional implementation, a U-shaped magnetizing element is provided inside the mounting housing. The moving contact has a moving contact portion for closing / opening with the stationary contact. The end of the moving contact away from the moving contact portion passes through the opening of the U-shaped magnetizing element, and a magnetizing block is correspondingly provided at the position of the moving contact portion away from the bottom of the U-shaped magnetizing element. The magnetizing block and the moving contact portion are respectively provided on both sides of the rotating shaft. The U-shaped magnetizing element and the magnetizing block are used to generate a force that causes the moving contact to abut against the stationary contact.

[0012] As an optional implementation, an arc-extinguishing element is provided inside the mounting housing. When the moving contact and the stationary contact are closed, the contact portion of the moving contact and the stationary contact is located at the entrance of the arc-extinguishing element, and the contact portion of the moving contact and the stationary contact, as well as at least a portion of the arc-extinguishing element, are located within the projection of the electromagnetic drive mechanism along the first direction.

[0013] As an optional implementation, the mounting housing is provided with a magnetic shield arranged circumferentially around the electromagnetic drive mechanism; the magnetic shield is rectangular and covers at least four sides of the mounting housing; at least one surface of the mounting housing is provided with a protrusion; and the magnetic shield is provided with a through hole that mates with the protrusion.

[0014] As an optional implementation, it also includes a moving contact terminal block, which extends in a direction parallel to the axis of the electromagnetic coil; the moving contact terminal block is provided with a flexible connecting wire, and the end of the moving contact away from the moving contact portion is connected to the flexible connecting wire; the flexible connecting wire and the stationary contact are located on the same side of the moving contact.

[0015] As an optional implementation, a stationary contact terminal block is also included. The stationary contact terminal block includes a first contact portion, a second lead-out portion, a third lead-out portion, and a second end portion, wherein one end of the second lead-out portion is connected at an angle to the first contact portion, and the other end is connected at an angle to the third lead-out portion. The second end portion is perpendicularly connected to the third lead-out portion and is used to connect to a terminal block.

[0016] Secondly, this application provides an electricity meter, including a meter housing, the aforementioned load switch, and a current transformer; the load switch and the current transformer are installed inside the meter housing, and the load switch and the current transformer are arranged sequentially along a first direction.

[0017] The beneficial effects of the embodiments of this application include:

[0018] This application provides a load switch, including a mounting housing, an electromagnetic drive mechanism, and a contact assembly. The electromagnetic drive mechanism and the contact assembly are arranged close to each other along a first direction within the mounting housing. This embodiment places the contact assembly close to the electromagnetic drive mechanism, which helps reduce the installation space occupied by the electromagnetic drive mechanism and the contact assembly, thus resulting in a smaller mounting housing. The electromagnetic drive mechanism of this embodiment includes an electromagnetic coil, a yoke assembly, and a rotating armature assembly. The contact assembly includes a moving contact and a stationary contact. The rotating armature assembly is connected to one end of the moving contact. The electromagnetic coil drives the moving contact to rotate through the rotating armature assembly, causing the other end of the moving contact to open or close with the stationary contact. One end of the electromagnetic coil is close to the inner wall of the mounting housing, and the closing position of the stationary and moving contacts is close to the other end of the electromagnetic coil. This embodiment arranges the closing position of the stationary and moving contacts at one end of the electromagnetic drive mechanism and close to it, which helps reduce the length of the load switch and results in a smaller load switch size.

[0019] This application provides an electricity meter, including a meter housing, the aforementioned load switch, and a current transformer. The load switch and current transformer are installed inside the meter housing and are arranged sequentially along a first direction. The electricity meter of this application uses the aforementioned load switch, which allows for a miniaturized design. Therefore, the load switch does not occupy a large installation space within the meter housing, thus reducing the size of the meter housing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is one of the structural schematic diagrams of the load switch according to an embodiment of this application;

[0022] Figure 2 This is a second schematic diagram of the load switch according to an embodiment of this application;

[0023] Figure 3 This is the third schematic diagram of the load switch in the embodiments of this application;

[0024] Figure 4 This is the fourth schematic diagram of the load switch in the embodiments of this application;

[0025] Figure 5 This is the fifth schematic diagram of the load switch in the embodiments of this application.

[0026] icon:

[0027] 100-Mounting housing; 101-Electromagnetic drive mechanism; 102-Moving contact; 103-Stationary contact; 104-Moving contact terminal block; 105-Flexible connection wire; 106-Stationary contact terminal block; 107-First direction; 108-Rotating armature assembly; 109-Linkage structure; 110-Connecting part; 111-Moving contact mounting base; 112-Rotating shaft; 113-U-shaped magnetizing component; 114-Magnetic block; 115-Arc extinguishing component; 116-Magnetic shielding cover; 117-First yoke; 118-Second yoke; 119-Second direction; 120-First contact part; 121-Second lead-out part; 122-Third lead-out part; 123-Second end; 124-PCB board; 125-Varistor; 126-Capacitor; 127-Transformer; 128-Microcontroller; 129-High-power resistor. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar reference numerals 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. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "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 application based on the specific circumstances.

[0032] Electricity meters typically contain a PCB board for data exchange with external devices. Furthermore, to ensure accurate and stable energy measurement, they usually require numerous components such as transformers, microcontrollers (MCUs), and capacitors. This significantly limits the space available for load switches, leading to a trend towards miniaturization. Current technologies employ complex transmission structures, such as push-lock mechanisms or gear drives, to move the moving contact 102, requiring substantial assembly space. Additionally, the overall structural layout of existing load switches is not compact enough, resulting in a large overall size. This necessitates significant assembly space when the load switch is installed within the electricity meter, hindering miniaturization design.

[0033] To address the aforementioned technical problems, embodiments of this application provide a load switch and an electricity meter.

[0034] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, this application embodiment provides a load switch, including a mounting housing 100, an electromagnetic drive mechanism 101, and a contact assembly; the electromagnetic drive mechanism 101 and the contact assembly are arranged in the mounting housing 100 along a first direction 107 and close to each other;

[0035] The electromagnetic drive mechanism 101 includes an electromagnetic coil, a yoke assembly, and a rotating armature assembly 108; the contact assembly includes a moving contact 102 and a stationary contact 103; the rotating armature assembly 108 is connected to one end of the moving contact 102, and the electromagnetic coil drives the moving contact 102 to rotate through the rotating armature assembly 108, so that the other end of the moving contact 102 is closed or opened with the stationary contact 103; one end of the electromagnetic coil is close to the inner wall of the mounting housing 100, and the closed position of the stationary contact 103 and the moving contact 102 is close to the other end of the electromagnetic coil.

[0036] The moving contact 102 and the stationary contact 103 have at least one closed position, and the projection of the electromagnetic drive mechanism 101 along the first direction 107 covers at least one closed position.

[0037] It should be noted that in this embodiment of the application, the electromagnetic drive mechanism 101 is arranged in the first mounting position, and one end of the electromagnetic drive mechanism 101 is close to the inner wall of the mounting housing 100. This arrangement allows the electromagnetic drive mechanism 101 to make full use of the internal space of the mounting housing 100, reduce unnecessary gaps, and thus optimize the compactness of the overall structure.

[0038] Furthermore, in this embodiment, the electromagnetic drive mechanism 101 generates a magnetic field when energized, which drives the moving contact 102 to rotate via the linkage structure 109, thereby realizing the closing or opening operation of the switch. Compared with traditional push-card or gear transmission structures, the drive mechanism of this embodiment has a simpler structure and smaller volume, which can significantly reduce the complexity of the transmission mechanism and the space occupied.

[0039] The contact assembly in this embodiment includes a moving contact 102 and a stationary contact 103, with the closed position of the stationary contact 103 and the moving contact 102 close to the other end of the electromagnetic coil. This embodiment positions the closed position of the stationary contact 103 and the moving contact 102 at one end of the electromagnetic coil and close to it, allowing the moving contact 102 to move within the space between the stationary contact 103 and the electromagnetic drive mechanism 101. This design shortens the movement path of the moving contact 102, reducing the travel required for the moving contact 102 to move from open to closed, further improving the switching speed and response time. Simultaneously, this compact layout reduces the spacing between the contact assembly and other components, optimizing the overall structural compactness.

[0040] In this embodiment of the application, the electromagnetic drive mechanism 101 and the contact assembly are arranged along the first direction 107 and close to each other within the mounting housing 100.

[0041] It should be noted that the first direction 107 can be vertical. The mounting housing 100 of this application embodiment has a first mounting position and a second mounting position that are close to each other, so that the contact assembly can be as close as possible to the electromagnetic drive mechanism 101. This is beneficial to reducing the installation space occupied by the electromagnetic drive mechanism 101 and the contact assembly, and to reducing the length of the load switch, so that the load switch has a smaller volume.

[0042] Reference Figure 1 , Figure 2As shown, in one optional embodiment, the contact assembly includes a moving contact mounting base 111, and a connecting rod structure 109 is provided between the rotating armature assembly 108 and the moving contact mounting base 111; the rotating armature assembly 108 is provided with a connecting part 110 that is hinged to the connecting rod structure 109, the moving contact mounting base 111 and the connecting rod structure 109 are rotatably connected, and the connecting part 110, the connecting rod structure 109 and the moving contact mounting base 111 constitute a four-bar linkage mechanism, and the electromagnetic drive mechanism 101 drives the moving contact 102 and the stationary contact 103 to open and close the circuit through the four-bar linkage mechanism.

[0043] It should be noted that, in this embodiment of the application, the electromagnetic drive mechanism 101 can drive the rotating armature assembly 108 to move when energized, and the rotating armature assembly 108 drives the moving contact 102 to rotate through the connecting part 110 and the connecting rod structure 109.

[0044] Reference Figure 2 , Figure 3 As shown, in this embodiment, the two ends of the linkage structure 109 are rotatably connected to the moving contact mounting base 111 and the connecting portion 110, respectively, so that the connecting portion 110, the linkage structure 109, and the moving contact mounting base 111 constitute a four-bar linkage. The fixed side of the four-bar linkage is close to the electromagnetic drive mechanism 101.

[0045] This embodiment of the application, through the above-described configuration, can generate a larger driving torque and has a larger torque transmission ratio, avoiding the use of electromagnetic coils with large driving forces. In other words, when the initial torque generated by the electromagnetic coil is transmitted to the moving contact 102 assembly, the torque loss is small. This embodiment of the application can achieve stable closing of the moving contact 102 and the stationary contact 103 using an electromagnetic coil with a smaller driving force.

[0046] Compared to existing technologies, the embodiments of this application achieve power transmission through only one linkage structure 109. Therefore, the embodiments of this application can reduce the use of transmission components and avoid numerous shaft-hole fits, thereby helping to prevent displacement loss during transmission and improving transmission efficiency. Furthermore, the embodiments of this application can effectively reduce the size of the moving contact 102 drive mechanism, which is beneficial for miniaturization design.

[0047] Reference Figure 1 , Figure 2 As shown, in this embodiment of the application, the connecting part 110, the connecting rod structure 109, and the moving contact mounting base 111 form a U-shaped structure with an opening facing the electromagnetic drive mechanism 101.

[0048] Reference Figure 1 , Figure 2As shown, the yoke assembly of this application embodiment includes a first yoke 117 and a second yoke 118 arranged along a first direction 107, and a rotating armature assembly 108 and an electromagnetic coil arranged along a second direction 119; the first direction 107 and the second direction 119 intersect.

[0049] For example, the first direction 107 is the up-down direction, and the second direction 119 is the left-right direction. The first direction 107 and the second direction 119 may intersect perpendicularly.

[0050] It should be noted that those skilled in the art can adjust the first direction 107 and the second direction 119 according to the needs of the assembly environment.

[0051] Reference Figure 2 , Figure 3 As shown, in one optional embodiment, the moving contact mounting base 111 is provided with a plurality of moving contacts 102, which are arranged along a third direction; wherein, the first direction 107, the second direction 119 and the third direction are perpendicular to each other; a rotating shaft 112 connected to the mounting housing 100 passes through the moving contact mounting base 111 and the moving contacts 102.

[0052] The contact assembly in this embodiment further includes a moving contact mounting base 111, on which a plurality of moving contacts 102 are disposed. The plurality of moving contacts 102 can increase the closing contact surface with the stationary contact 103. The arrangement of the plurality of moving contacts 102 in this embodiment can effectively increase the closing stability of the load switch. In addition, the plurality of moving contacts 102 can also extend the service life of the load switch.

[0053] Reference Figure 2 , Figure 3 As shown, in one optional embodiment, a U-shaped magnetizing element 113 is provided inside the mounting housing 100. The moving contact 102 has a moving contact portion that can be used to contact or separate from the stationary contact 103 to form a closed position or an open position. The end of the moving contact 102 away from the moving contact portion passes through the opening of the U-shaped magnetizing element 113, and a magnetizing block 114 is provided at the position of the section of the moving contact 102 away from the bottom of the U-shaped magnetizing element 113. The magnetizing block 114 and the moving contact portion are respectively provided on both sides of the rotating shaft 112.

[0054] The U-shaped magnetizing element 113 and the magnetizing block 114 are used to generate a force that causes the moving contact 102 to abut against the stationary contact 103.

[0055] It should be noted that the U-shaped magnetizing element 113 and the magnetizing block 114 in this embodiment of the application can generate a magnetic attraction force. The magnetic attraction force causes the end of the moving contact 102 away from the stationary contact 103 to approach the bottom of the U-shaped magnetizing element 113, thereby generating a force that causes the moving contact 102 to rotate. The end of the moving contact 102 that is close to the stationary contact 103 will generate a force that abuts against the stationary contact 103, ensuring that the moving contact 102 will not be repelled under the action of a large short-circuit current, thus improving the short-circuit withstand performance.

[0056] In this embodiment, the U-shaped magnetizing block 114 helps with closing, which improves the stability of closing and ensures reliable contact between the moving contact 102 and the stationary contact 103. Additionally, an elastic element is provided between the moving contact mounting base 111 and the moving contact 102. When this elastic element is compressed, it generates a force that brings the moving contact 102 closer to the stationary contact 103.

[0057] The embodiments of this application achieve compact assembly by making the two sides of the U-shaped magnetizing component 113 symmetrical about the rotational plane of the moving contact 102, without occupying a large installation space.

[0058] It should be noted that the U-shaped magnetizing component 113 in this application embodiment can be a one-piece structure or a split structure, and those skilled in the art can make the settings as needed.

[0059] Reference Figure 2 , Figure 3 As shown, in an optional implementation, an arc-extinguishing element 115 is also provided inside the mounting housing 100. When the moving contact 102 and the stationary contact 103 are closed, the contact portion of the moving contact 102 and the stationary contact 103 is located at the entrance of the arc-extinguishing element 115. Furthermore, the contact portion of the moving contact 102 and the stationary contact 103, as well as the arc-extinguishing element 115, are all located below the electromagnetic coil, that is, the contact portion of the moving contact 102 and the stationary contact 103 and at least part of the arc-extinguishing element 115 are located within the projection of the electromagnetic drive mechanism 101 along the first direction. Specifically, in this embodiment, the arc-extinguishing element is a U-shaped arc-extinguishing block, and the contact portion of the moving contact 102 and the stationary contact 103 is located in the opening of the U-shaped arc-extinguishing block. The two sides of the U-shaped arc-extinguishing block are symmetrical about the motion plane of the moving contact 102. In other embodiments, it can also be an arc-extinguishing grid or other arc-extinguishing structures, which are not limited here.

[0060] When the load switch switches from the closed to the open state, a high voltage is generated between the moving contact 102 and the stationary contact 103 at the moment of separation, causing the air to break down and forming an electric arc. The electric arc not only consumes a lot of energy, but also generates high temperature, which can easily damage the contacts.

[0061] It should be noted that the U-shaped arc extinguishing element 115 in this application embodiment can be a permanent magnet, which applies a lateral force to the arc through the magnetic field, causing the arc to move along the direction of the magnetic field and away from the contact area, thereby accelerating the cooling and extinguishing of the arc.

[0062] It should be noted that the U-shaped arc-extinguishing element 115 in this embodiment can also generate high-pressure gas, which removes the arc from the contact area, reducing arc erosion of the contacts and extending their service life. Simultaneously, gas arc blowing effectively prevents arc reignition, ensuring reliable switch disconnection.

[0063] Reference Figure 4 As shown, in one optional embodiment, the mounting housing 100 is provided with a magnetic shield 116 arranged circumferentially around the electromagnetic drive mechanism 101. The magnetic shield 116 is rectangular and covers at least four sides of the mounting housing 100; at least one surface of the mounting housing 100 is provided with a protrusion; and the magnetic shield 116 is provided with through holes that mate with the protrusion.

[0064] In this embodiment, the electromagnetic drive mechanism 101 is protected from interference from external magnetic fields by the magnetic shield 116, ensuring stable operation of the load switch and thus guaranteeing the accuracy and reliability of the meter.

[0065] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, as an optional implementation, it also includes a moving contact terminal block 104. The moving contact terminal block 104 extends parallel to the first direction 107 to ensure that there is space to connect with the moving contact 102, and can make full use of the space of the load switch in the first direction 107. The moving contact terminal block 104 is provided with a flexible connecting wire 105, and the end of the moving contact 102 away from the moving contact portion is connected to the flexible connecting wire 105. The flexible connecting wire 105 and the stationary contact 103 are located on the same side of the moving contact 102.

[0066] In this embodiment, the flexible connecting wire 105 and the stationary contact 103 are arranged on the same side of the moving contact 102, so that the flexible connecting wire 105 can be arranged in the space between the moving contact 102 and the inner wall of the mounting housing 100. On the one hand, this can improve the compactness of the structural layout, and on the other hand, it can ensure that the flexible connecting wire 105 has a certain amount of flexibility while keeping its length as short as possible.

[0067] It should be noted that, in this embodiment of the application, one end of the moving contact terminal block 104 is inserted into the mounting housing 100, and the inserted end does not have a bending structure, but is directly inserted into the mounting housing 100 along the axis of the electromagnetic drive mechanism 101. That is to say, in this embodiment of the application, the extending direction of the moving contact terminal block 104 is consistent with the axis of the electromagnetic coil.

[0068] In this embodiment, the insertion end of the moving contact terminal block 104 is directly inserted into the mounting housing 100, making installation convenient and quick, and reducing assembly time and difficulty. Meanwhile, the design of the flexible connecting wire 105 makes the connection between the moving contact terminal block 104 and the moving contact 102 more flexible, facilitating subsequent maintenance and replacement.

[0069] Reference Figure 1 , Figure 2 As shown, as an optional implementation, it also includes a stationary contact terminal block 106. The stationary contact terminal block 106 includes a first contact portion 120, a second lead-out portion 121, a third lead-out portion 122, and a second end portion 123. One end of the second lead-out portion 121 is connected to the first contact portion 120 at an angle, and the other end is connected to the third lead-out portion 122 at an angle, so as to avoid the installation of other electrical components. The second end portion 123 is perpendicularly connected to the third lead-out portion 122 and is used to connect to a terminal block.

[0070] It should be noted that, in this embodiment, one side of the first contact portion 120 abuts against the inner wall of the mounting housing 100, and the other side has a contact point that can make contact with the moving contact 102 when closing. In this embodiment, the inner wall of the mounting housing 100 can provide support for the first contact portion 120, thereby improving the structural stability when the moving contact 102 and the stationary contact 103 make contact when closing, and effectively preventing the stationary contact 103 from loosening.

[0071] In addition, in this embodiment, the first contact portion 120 is disposed directly below the electromagnetic drive mechanism 101, and the movement path of the moving contact 102 is restricted between the electromagnetic drive mechanism 101 and the first contact portion 120, which helps to reduce the movement of the moving contact 102, thereby making the internal structure of the load switch compact.

[0072] This application provides an electricity meter, including a meter housing, the aforementioned load switch and current transformer; the load switch and current transformer are installed inside the meter housing, and are arranged sequentially along the first direction 107.

[0073] Reference Figure 5 As shown, in this embodiment of the application, the load switch is mounted on the surface of the PCB board 124 of the meter. Around the mounting housing 100 are arranged components such as a varistor 125, a capacitor 126, a transformer 127, a microcontroller 128, and a high-power resistor 129. These components are all positioned close to the mounting housing, which helps to reduce the size of the PCB board 124, ultimately enabling a miniaturized meter design.

[0074] The electricity meter in this embodiment uses the above-mentioned load switch. The load switch can achieve a miniaturized design, so the load switch will not occupy a large installation space in the meter housing, which is beneficial to reducing the volume of the meter housing.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A load break switch characterized by, The application relates to a contactor, which comprises a mounting shell (100), an electromagnetic driving mechanism (101) and a contact assembly; the electromagnetic driving mechanism (101) and the contact assembly are arranged in the mounting shell (100) along a first direction (107) and close to each other; the electromagnetic driving mechanism (101) comprises an electromagnetic coil, a yoke assembly and a rotating armature assembly (108); the contact assembly comprises a moving contact (102) and a static contact (103); one end of the rotating armature assembly (108) is connected with the moving contact (102), the electromagnetic coil drives the moving contact (102) to rotate through the rotating armature assembly (108), so that the other end of the moving contact (102) is separated from or combined with the static contact (103); the moving contact (102) and the static contact (103) have at least one combined position, and the projection of the electromagnetic driving mechanism (101) along the first direction (107) covers at least one combined position.

2. The load break switch according to claim 1, characterized in that The contact assembly comprises a moving contact mounting seat (111), a connecting rod structure (109) is arranged between the rotating armature assembly (108) and the moving contact mounting seat (111); the rotating armature assembly (108) is provided with a connecting part (110) which is rotatably connected with the connecting rod structure (109), and the moving contact mounting seat (111) is rotatably connected with the connecting rod structure (109); the connecting part (110), the connecting rod structure (109) and the moving contact mounting seat (111) form a four-bar linkage mechanism, and the electromagnetic driving mechanism (101) drives the moving contact (102) and the static contact (103) to separate or combine through the four-bar linkage mechanism.

3. The load break switch according to claim 2, characterized in that The connecting part (110), the connecting rod structure (109) and the moving contact mounting seat (111) form a U-shaped structure with an opening facing the electromagnetic driving mechanism (101).

4. The load break switch of claim 2, wherein, The yoke assembly comprises a first yoke (117) and a second yoke (118) arranged along a first direction (107), and the rotating armature assembly (108) and the electromagnetic coil are arranged along a second direction (119); the first direction (107) is perpendicular to the second direction (119).

5. The load break switch according to claim 4, characterized in that The moving contact mounting seat (111) is provided with a plurality of moving contacts (102), and the plurality of moving contacts (102) are arranged along a third direction; wherein the first direction (107), the second direction (119) and the third direction are perpendicular to each other; rotating shafts (112) connected with the mounting shell (100) are arranged on the moving contact mounting seat (111) and the moving contacts (102).

6. The load break switch according to claim 5, characterized in that A resilient element is arranged between the moving contact mounting seat (111) and the moving contact (102), and the resilient element is extruded to generate an acting force for making the moving contact (102) close to the static contact (103).

7. The load break switch according to claim 5, wherein, A U-shaped magnetic enhancer (113) is arranged in the installation housing (100); the movable contact (102) has a movable contact part for closing / opening with the fixed contact (103); one end of the movable contact (102) away from the movable contact part is arranged in the opening of the U-shaped magnetic enhancer (113), and the position of the movable contact (102) arranged in the opening of the U-shaped magnetic enhancer (113) away from the bottom of the U-shaped magnetic enhancer (113) is correspondingly provided with a magnetic enhancer block (114); The magnetic enhancer block (114) and the movable contact part are respectively arranged on both sides of the rotating shaft (112); the U-shaped magnetic enhancer (113) and the magnetic enhancer block (114) are used to generate a force for abutting the movable contact (102) and the fixed contact (103).

8. The load break switch according to any one of claims 1-3, characterized in that An arc extinguishing part (115) is arranged in the installation housing (100), when the movable contact (102) and the fixed contact (103) are closed, the contact part of the movable contact (102) and the fixed contact (103) is located at the entrance of the arc extinguishing part (115), and the contact part of the movable contact (102) and the fixed contact (103) and at least part of the arc extinguishing part (115) are located in the projection of the electromagnetic driving mechanism (101) along the first direction.

9. The load break switch according to any one of claims 1-3, characterized in that A magnetic shielding cover (116) is arranged outside the installation housing (100) and circumferentially around the electromagnetic driving mechanism (101); the magnetic shielding cover (116) is rectangular and covers at least four sides of the installation housing (100); at least one surface of the installation housing (100) is provided with a protrusion; the magnetic shielding cover (116) is provided with a through hole matched with the protrusion.

10. The load switch of claim 7, wherein, Further comprising a movable contact terminal block (104), the movable contact terminal block (104) extends along the first direction (107); the movable contact terminal block (104) is provided with a flexible connecting wire (105), one end of the movable contact (102) away from the movable contact part is connected with the flexible connecting wire (105); the flexible connecting wire (105) and the fixed contact (103) are arranged on the same side of the movable contact (102).

11. The load break switch according to any one of claims 1-3, characterized in that Further comprising a fixed contact terminal block (106), the fixed contact terminal block (106) comprises a first contact part (120) provided with a contact point, a second lead-out part (121) and a third lead-out part (122), and a second end part (123), one end of the second lead-out part (121) is connected with the first contact part (120) at an angle, the other end is connected with the third lead-out part (122) at an angle, and the second end part (123) is connected with the third lead-out part (122) perpendicularly, the second end part (123) is used for connecting with a terminal.

12. An electricity meter, characterised in that An ammeter housing, the load switch of any one of claims 1-11 and a mutual inductor are included; the load switch and the mutual inductor are installed in the ammeter housing, and the load switch and the mutual inductor are arranged in the first direction (107) in sequence.

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