Relay and meter

Abstract

The application relates to a relay and an electric meter, the electric meter comprising a relay, the relay comprising a magnetic circuit part, a contact part and a magnetic shield plate, wherein the magnetic circuit part is used for providing an electromagnetic force, the contact part is arranged on one side of the magnetic circuit part, the contact part is used for connecting a load circuit, and the contact part is provided with a movable contact piece which can be moved under the action of the electromagnetic force to control the on-off of the load circuit; the magnetic shield plate is arranged on the side of the magnetic circuit part close to the meter shell of the electric meter and is used for shielding the magnetic field interference outside the meter shell of the electric meter. Thus, only one magnetic shield plate needs to be arranged on the side of the magnetic circuit part close to the meter shell of the electric meter to shield the electromagnetic interference outside the electric meter, and no magnetic shield plate needs to be arranged on the other side of the magnetic circuit part due to the long distance from the meter shell of the electric meter, so that the structure for shielding the external electromagnetic interference in the relay is simple, the external electromagnetic interference can be effectively shielded, and the manufacturing cost of the relay can be reduced.

Description

Technical Field

[0001] This application relates to the field of electronic control device technology, and in particular to a relay and a meter. Background Technology

[0002] Relays are widely used in remote control, telemetry, communication, automatic control, mechatronics, smart meters, and power electronic equipment, and are one of the most important control components. Like other electromagnetic relays, magnetic latching relays automatically connect and disconnect circuits. However, unlike other electromagnetic relays, magnetic latching relays rely entirely on the permanent magnet force of a permanent magnet to maintain the relay in either a normally closed or normally open state. Simultaneously, the electromagnetic force generated by the electromagnetic coil counteracts the permanent magnet force, thus enabling the switching between these two states.

[0003] Existing magnetic latching relays are commonly used in the power industry, such as in electricity meters. However, there are interfering magnetic fields in the environment where electricity meters are used. When there is external magnetic field interference, the magnetic circuit is easily converted, which in turn causes the relay contact state to change. This can lead to the failure of the meter's prepaid function and may cause the magnetic latching relay to fail to maintain normal operation. Utility Model Content

[0004] Therefore, it is necessary to provide a relay and an electricity meter that can solve the problem of existing magnetic latching relays being easily interfered with by external magnetic fields when installed in electricity meters, thus causing them to malfunction.

[0005] According to one aspect of this application, a relay is provided for installation in an electricity meter, the relay comprising:

[0006] The magnetic circuit section is used to provide electromagnetic force;

[0007] A contact portion is provided on one side of the magnetic circuit portion along the first direction. The contact portion is used to connect the load circuit, and the contact portion has a movable contact element that can move under the action of the electromagnetic force to control the on / off state of the load circuit.

[0008] A magnetic shielding plate is disposed on the side of the magnetic circuit section near the meter casing. The magnetic shielding plate is used to shield the magnetic field interference outside the meter casing.

[0009] In one embodiment, the contact portion includes a contact assembly, which includes a moving contact with a moving contact and a stationary contact with a stationary contact. The moving contact is capable of moving along a second or third direction perpendicular to the first direction under the drive of the electromagnetic force provided by the magnetic circuit portion, so as to make the moving contact contact or separate from the stationary contact.

[0010] In one embodiment, the stationary contact has a first lead-out end, the moving contact has a second lead-out end, the first lead-out end and the second lead-out end are spaced apart along the second direction, and the direction of movement of the moving contact is consistent with the second direction;

[0011] Alternatively, the stationary contact has a first lead-out end and a second lead-out end spaced apart along the third direction, the third direction being perpendicular to the second direction, and the moving contact's direction of action being consistent with the second direction;

[0012] When the moving contact contacts the stationary contact in the direction of motion, the first lead-out end and the second lead-out end are connected to each other; when the moving contact separates from the stationary contact in the direction of motion, the first lead-out end and the second lead-out end are disconnected from each other.

[0013] In one embodiment, the contact components have at least two sets, and all the contact components are arranged side by side along the second direction.

[0014] In one embodiment, the magnetic circuit portion includes a coil winding and an armature assembly, the central axis of the coil winding extending along the second direction, and the armature assembly being adjacent to one side of the coil frame along the third direction.

[0015] In one embodiment, the armature assembly includes an armature and a pusher connected to each other, the pusher being connected to the moving contact, and the armature being able to rotate about a central axis extending along the first direction under the action of the electromagnetic force, so as to drive the pusher and the moving contact to swing along the second direction.

[0016] In one embodiment, the coil winding includes a coil frame and a coil wound on the coil frame. The coil frame has a connecting portion at at least one end along the second direction. A pin is provided on the connecting portion. One end of the pin is connected to the coil, and the other end is used to connect to an external circuit and extends in a straight line or bends.

[0017] In one embodiment, the moving contact includes a moving spring and a compression spring. The thickness direction of the moving spring is parallel to the second direction. The moving contact is located at one end of the moving spring. One end of the compression spring is connected to the portion of the moving spring near the moving contact, and the other end is connected to the armature assembly. Under the drive of the armature assembly, the compression spring can generate elastic deformation.

[0018] In one embodiment, the relay further includes a housing, at least a portion of the magnetic circuit portion and the contact portion are disposed within the housing, the bottom wall of the housing is configured to be adjacent to the meter casing, and the magnetic shielding plate is disposed between the magnetic circuit portion and the bottom wall of the housing.

[0019] According to another aspect of this application, an electricity meter is provided, including a meter housing and a relay as described in any of the above embodiments, the relay being disposed within the meter housing.

[0020] The aforementioned relay and meter only require a magnetic shielding plate to be installed on the side of the relay's magnetic circuit near the meter casing to shield against external electromagnetic interference. On the other sides of the magnetic circuit, since they are far from the meter casing, no magnetic shielding plate is needed. Therefore, the structure of the relay provided in this application for shielding against external electromagnetic interference is simple, and it can effectively shield against external electromagnetic interference while reducing the processing and manufacturing cost of the relay. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the appearance of an electricity meter provided in an embodiment of this application.

[0022] Figure 2 A schematic diagram of the internal structure of an electricity meter provided in an embodiment of this application (the meter casing is hidden).

[0023] Figure 3 This is an axonometric view of a relay provided in an embodiment of this application.

[0024] Figure 4 Schematic diagram of the internal structure of a relay provided in an embodiment of this application Figure 1 (The shell was hidden).

[0025] Figure 5 Schematic diagram of the internal structure of a relay provided in an embodiment of this application Figure 2 (The shell was hidden).

[0026] Figure 6 This is a schematic diagram of the structure of a coil and coil frame provided in an embodiment of this application.

[0027] Figure 7 This is a schematic diagram of a coil wound on a coil frame according to an embodiment of this application.

[0028] Figure 8 This is a schematic diagram of a coil wound on a coil frame, provided for another embodiment of this application.

[0029] Figure 9 A front view of a relay provided in an embodiment of this application.

[0030] Figure 10 A front view of a relay provided in an embodiment of this application (housing is hidden).

[0031] Figure 11 This is a front view of the magnetic circuit portion of a relay provided in an embodiment of this application.

[0032] Figure 12 This is an axial view of the connection between the push card and the moving contact in a relay provided in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10. Meter; 100. Meter case; 101. Terminal block; 102. Guide rail groove; 200. Relay; 210. Housing; 220. Magnetic circuit part; 221. Pin; 222. Coil winding; 2221. Coil frame; 2221a. Connecting part; 2222. Coil; 223. Armature assembly; 2231. Armature; 2232. Pusher; 224. First yoke; 225. Second yoke; 230. 231. Contact part; 231. Contact assembly; 2311. Moving contact; 2311a. Fixed end; 2311b. Contact end; 2311c. Moving spring; 2311d. Compression spring; 2312. Moving contact; 2313. Stationary contact; 2313a. Lead-out end; 2313b. First lead-out end; 2313c. Second lead-out end; 2314. Stationary contact; 240. Magnetic shielding plate; 300. Current transformer. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] This application provides a relay and an electricity meter, see reference. Figure 1 and Figure 2 , Figure 1 This paper shows a schematic diagram of the appearance of the meter 10 in one embodiment of the present application. Figure 2A schematic diagram of the internal structure of the electricity meter 10 is shown. One embodiment of the electricity meter 10 provided in this application is a double-rail meter, comprising a casing 100 and a relay 200 disposed within the casing 100. The casing 100 has several terminals 101 for connecting to a load circuit. One terminal 101 has a current transformer 300 for measuring the current, enabling the electricity meter 10 to obtain the load's power consumption during operation. The relay 200 has several leads 2313a, each lead 2313a correspondingly connected to one terminal 101. The relay 200 controls the on / off state of the load circuit, thereby protecting the load through circuit switching and automatic adjustment, preventing damage to the load due to excessive current.

[0042] In the embodiments of this application, the relay 200 is a magnetic latching relay 200. The structure of the relay 200 in this embodiment will be described below. It is understood that the relay 200 provided in this application can be any type of relay 200 used in other fields, and is not limited to the magnetic latching relay 200 used in the meter 10. Furthermore, the meter 10 is not limited to a double-rail meter, but can be any type of meter 10, and there are no particular limitations in this regard.

[0043] See Figure 3 , Figure 4 and Figure 5 , Figure 3 A schematic diagram of a relay 200 provided in an embodiment of this application is shown. Figure 4 and Figure 5 A schematic diagram of the internal structure of a relay 200 is shown. The relay 200 in this embodiment includes a housing 210, a magnetic circuit portion 220, and a contact portion 230. The magnetic circuit portion 220 and the contact portion 230 are at least partially disposed within the housing 210 and are arranged adjacent to each other along a first direction (the X direction shown in the figure). The magnetic circuit portion 220 is used to provide electromagnetic force; the contact portion 230 is used to connect to a load circuit. Under the action of the electromagnetic force, the contact portion 230 can control the on / off state of the load circuit. In some embodiments, the magnetic circuit portion 220 includes a coil winding 222, which includes a coil frame 2221 and a coil 2222 wound on the coil frame 2221. The central axis of the coil frame 2221 extends along a second direction perpendicular to the first direction (the Y direction shown in the figure), and the coil frame 2221 is provided with a plurality of pins 221 for connecting to an external power source. Under the drive of electrical energy provided by the external power source, the coil 2222 can be energized to generate a magnetic field, thereby generating electromagnetic force.

[0044] However, as described in the background section, existing magnetic latching relays 200 are commonly used in the power industry, such as in electricity meters 10, which are typically installed in electrical control cabinets. In such an environment, there are interfering magnetic fields generated by other electrical devices. Under the interference of these magnetic fields, the magnetic circuit of the magnetic latching relay 200 is easily switched, causing the magnetic latching relay 200 to fail to maintain normal operation.

[0045] In order to shield against interfering magnetic fields and ensure the normal operation of relay 200, in the embodiments provided in this application, such as Figure 4 and Figure 5 The relay 200 also includes a magnetic shielding plate 240 disposed in the housing 210. By disposing of the magnetic shielding plate 240, interference magnetic fields outside the meter housing 100 can be shielded to prevent them from affecting the relay 200. Preferably, the magnetic shielding plate 240 can be made of magnetically conductive materials such as pure iron or low-carbon steel. The specific shielding principle is to make the magnetic lines of force of the interference magnetic field preferentially pass through the magnetic shielding plate 240, rather than the magnetic circuit part 220 and contact part 230 inside the relay 200. This allows the magnetic shielding plate 240 to guide the magnetic lines of force of the external interference magnetic field to detour, confining the magnetic lines of force of the external interference magnetic field within itself and reducing the direct penetration of the magnetic field into the core components of the relay 200.

[0046] Regarding the specific placement of the magnetic shielding plate 240 within the housing 210, the magnetic shielding plate 240 is positioned on the side of the magnetic circuit portion 220 near the meter housing 100 of the meter 10. Specifically, in one embodiment provided in this application, it can be combined with... Figure 1 As shown, the relay 200 is positioned near the bottom wall of the meter housing 100, making the bottom wall of the relay 200 housing 210 adjacent to the bottom wall of the meter housing 100. Therefore, the position of the relay 200 near the bottom wall of the meter housing 100 is most susceptible to interference from external magnetic fields compared to other positions farther away from the meter housing 100. Thus, in this embodiment, the magnetic shielding plate 240 is positioned on the third direction (Z direction shown in the figure, which is perpendicular to both the first and second directions) of the coil frame 2221, that is, between the magnetic circuit portion 220 and the bottom wall of the housing 210. Thus, it can be seen that electromagnetic interference from outside the meter 10 can be shielded simply by installing a magnetic shielding plate 240 on the side of the magnetic circuit portion 220 of the relay 200 close to the meter casing 100. On the other sides of the magnetic circuit portion 220, since the distance from the meter casing 100 is relatively far, there is no need to install a magnetic shielding plate 240. Therefore, the structure of the relay 200 provided in this application for shielding external electromagnetic interference is simple, and while effectively shielding external electromagnetic interference, it can also reduce the processing and manufacturing cost of the relay 200.

[0047] It is understandable that if the housing 210 of the relay 200 is close to the housing 100 of the meter 10 on multiple sides, magnetic shielding plates 240 can also be provided on multiple sides of the magnetic circuit section 220, and there is no limitation here.

[0048] In a preferred embodiment, such as Figure 6 As shown, the coil frame 2221 has a connecting part 2221a at one end along the second direction. A pin 221 is provided on the connecting part 2221a. One end of the pin 221 is connected to the coil 2222 of the coil winding 222, and the other end is used to connect to an external circuit and extends in a straight line or bends.

[0049] Figure 7 In the diagram, the connecting part 2221a is located on the right side of the coil frame 2221, indicating that the external power supply is also on this side. This is useful when the client's wiring requirements change, for example, when the external power supply is... Figure 8 When the coil holder 2221 shown is on the left side, it can be rotated 180° so that the connecting part 2221a with the pin 221 is located on the left side of the coil holder 2221. Therefore, there is no need to replace the coil holder 2221, thus saving costs. It is understood that the coil holder 2221 can also have connecting parts 2221a and pins 221 at opposite ends along its own axis. In this way, when the customer's wiring requirements change, the coil holder 2221 can be connected directly to the pins 221 in different positions without disassembling the coil holder 2221. The specific design can be customized as needed and is not limited thereto.

[0050] Regarding the structure of the contact portion 230, the contact portion 230 includes at least two sets of contact components 231. Setting at least two sets of contact components 231 can cope with scenarios that require switching on and off multiple load circuits. Figures 3 to 5In the embodiment, the contact component 231 has two sets, and the two sets of contact components 231 are arranged side by side along the second direction. Each set of contact components 231 includes a moving contact 2311 with a moving contact 2312 and a stationary contact 2313 with a stationary contact 2314. A plurality of leads 2313a include a first lead 2313b and a second lead 2313c. The first lead 2313b and the second lead 2313c can be respectively disposed on the stationary contact 2313 and the moving contact 2311, or they can both be disposed on the stationary contact 2313. One of the first lead 2313b and the second lead 2313c is used to connect to the input terminal of the load circuit through the corresponding terminal 101 on the case 100, and the other is used to connect to the output terminal of the load circuit through the corresponding terminal 101. When the coil 2222 is energized, the moving contact 2311 can swing under the drive of the electromagnetic force generated by the magnetic circuit part 220, so that the moving contact 2312 and the stationary contact 2314 can contact or separate. When the moving contact 2312 and the stationary contact 2314 are in contact, the first lead 2313b and the second lead 2313c are connected to each other. When the moving contact 2312 and the stationary contact 2314 are separated, the first lead 2313b and the second lead 2313c are disconnected from each other, thereby realizing the connection or disconnection of the load and the external circuit.

[0051] It is worth noting that the relay 200 provided in this application is installed in a double-layer guide rail meter, combined with Figure 1 As shown, the case 100 of the double-layer guide rail meter has a cubic structure. Its dimension in the second direction is smaller than that in the first and third directions. The space in the first and third directions is larger than that in the second direction. The case 100 is provided with a guide rail groove 102 extending along the second direction. The meter 10 is installed on the guide rail through the guide rail groove 102. The dimension of the case 100 in the second direction is smaller than that in the first and third directions. This can minimize the length of the guide rail occupied by the meter 10, so that the guide rail can have more space to install other components and improve the utilization rate of the guide rail.

[0052] By placing the contact portion 230 on one side of the magnetic circuit portion 220 along the first direction, the moving contact 2311 can swing along the second direction under the drive of the magnetic circuit portion 220, so that the moving contact 2312 contacts or separates from the stationary contact 2314.

[0053] Thus, it can be seen that through the above design, the moving contact 2311 can swing in the second direction without the magnetic circuit portion 220 encroaching on the swing space of the moving contact 2311 in the second direction, allowing the moving contact 2311 to have a large swing space. Because the moving contact 2311 can swing in a large space, the stationary contact 2314 and the moving contact 2312 can maintain a sufficient distance when separated, thus creating a large electrical clearance between the stationary contact 2314 and the moving contact 2312. Therefore, there is enough space to dissipate the heat generated when the circuit is turned on, meeting the requirements of high-current applications.

[0054] In a specific arrangement, in one embodiment, the first lead-out end 2313b can be disposed on the stationary contact member 2313, and the second lead-out end 2313c can be disposed on the moving contact member 2311. The first lead-out end 2313b and the second lead-out end 2313c are spaced apart along a second direction. When the moving contact member 2311 swings along the second direction, the first lead-out end 2313b and the second lead-out end 2313c can be made to be connected or disconnected from each other.

[0055] In another embodiment, such as Figure 9 and Figure 10 As shown, the stationary contact 2313 includes two stationary springs. A first lead-out end 2313b and a second lead-out end 2313c are respectively disposed on one of the stationary springs, and the first lead-out end 2313b and the second lead-out end 2313c are offset from each other along a third direction. More specifically, in this embodiment, the moving contact 2311 has a fixed end 2311a and a contact end 2311b disposed opposite each other along a third direction. The fixed end 2311a is fixedly connected to the first lead-out end 2313b. The moving contact 2312 is disposed on the contact end 2311b, and the stationary contact 2314 is disposed on the second lead-out end 2313c. Under the drive of electromagnetic force, the contact end 2311b can swing relative to the fixed end 2311a in a second direction, so that the moving contact 2312 and the stationary contact 2314 come into contact or separate from each other.

[0056] As can be seen, through the design of the above embodiment, the magnetic circuit part 220 will not encroach on the swing space of the moving contact 2311, allowing the moving contact 2311 to swing along the second direction, thus providing a large swing space. Because the moving contact 2311 has a large swing space, the stationary contact 2314 and the moving contact 2312 can maintain a sufficient distance in the separated state, resulting in a large electrical clearance between them. This improves insulation performance, prevents short circuits, facilitates heat dissipation and maintenance, enhances anti-interference capabilities, and avoids malfunctions, meeting the requirements of high-current applications.

[0057] Furthermore, it can be observed that since the first lead 2313b and the second lead 2313c are spaced apart along a third direction, therefore... Figure 9 As shown, the first lead-out terminal 2313b and the second lead-out terminal 2313c are both located close to the shell wall of the housing 210. Therefore, the first lead-out terminal 2313b and the second lead-out terminal 2313c do not need to be extended too far to extend out of the housing 210 and connect to the wiring terminal 101 on the meter housing 100, thereby saving the material used to manufacture the first lead-out terminal 2313b and the second lead-out terminal 2313c.

[0058] It is understood that the portions of the first lead 2313b and the second lead 2313c housed within the housing 210 can be either curved or planar, and there is no limitation on this. For example Figure 9 and Figure 10 In the embodiment, the portion of the first lead-out end 2313b housed in the housing 210 has a structure that extends along a plane, and the portion of the second lead-out end 2313c housed in the housing 210 has a structure that extends in a bent direction. The structure that extends along a plane can make the fabrication of the lead-out end 2313a simpler.

[0059] More specifically, regarding the structure of how the magnetic circuit section 220 drives the moving contact 2311 to oscillate, such as... Figure 10 As shown, the magnetic circuit part 220 also includes an armature assembly 223. The contact end 2311b of the moving contact 2311 is connected to the armature assembly 223. When the coil 2222 generates electromagnetic force, the armature assembly 223 can move under the drive of the electromagnetic force, so as to drive the contact end 2311b of the moving contact 2311 to swing.

[0060] As mentioned above, the case 100 of the double-layer guide rail watch has a relatively large space in the third direction. Therefore, in order to make full use of the third space, the central axis of the coil holder 2221 extends along the second direction. In this way, when the coil holder 2221 is wound with the coil 2222, the space occupied by the coil holder 2221 in the third direction (i.e., the radial direction of the coil holder 2221) will not be very large. Based on this arrangement, such as Figure 5 As shown, the armature assembly 223 can be disposed adjacent to the coil frame 2221 on one side along the third direction, thereby allowing the contact portion 230 to be disposed adjacent to the coil frame 2221 on one side along the first direction. It is easy to see that through this design, the space inside the meter housing 100 in the third direction can be fully utilized, and the size of the relay 200 in the first direction is smaller, making the overall structure of the relay 200 more compact.

[0061] Please continue reading. Figure 10In the embodiment shown in the figure, the armature assembly 223 includes an armature 2231 and a pusher 2232 connected to each other. The pusher 2232 is connected to the contact end 2311b of the moving contact 2311. When the coil 2222 is energized to generate electromagnetic force, the armature 2231 can rotate around a central axis extending in a first direction under the action of electromagnetic force, so as to drive the pusher 2232 and the moving contact 2311 to swing in a second direction.

[0062] In one embodiment, the relay 200 provided in this application is a magnetic latching relay 200. To achieve the magnetic latching function, that is, after the coil 2222 is de-energized, the moving contact 2312 and the stationary contact 2314 can remain connected or remain disconnected, as follows: Figure 11 As shown, the magnetic circuit part 220 also includes a first yoke 224 and a second yoke 225. The first yoke 224 and the second yoke 225 are respectively disposed at opposite ends of the coil frame 2221 along its own axis (i.e., the second direction). When the coil 2222 is energized, that is, when the coil 2222 is subjected to voltage, one of the first yoke 224 and the second yoke 225 acts as the positive pole and the other acts as the negative pole. An electromagnetic field can be generated between the two to generate electromagnetic force.

[0063] Please continue reading. Figure 11 When the relay 200 is working, when a positive voltage is applied to the coil 2222, the armature 2231 rotates clockwise around the central axis extending in the first direction. At this time, one end of the armature 2231 in the second direction is attached to the upper side of the first yoke 224 under the action of electromagnetic force. At the same time, the pusher 2232 pushes the contact end 2311b of the moving contact 2311 to swing so that the moving contact 2312 contacts the stationary contact 2314. Conversely, when a negative voltage is applied to the coil 2222, the armature 2231 rotates counterclockwise around the central axis. The other end of the armature 2231 in the second direction is attached to the upper side of the second yoke 225 under the action of electromagnetic force. The pusher 2232 pushes the moving contact 2311 to swing in the opposite direction so that the moving contact 2312 disengages from the stationary contact 2314.

[0064] It is easy to see that because the armature 2231 is magnetic, when the coil 2222 is de-energized, the armature 2231 can still maintain contact with the upper side of the first yoke 224 or the upper side of the second yoke 225, so that the moving contact 2312 and the stationary contact 2314 can still maintain contact or be disconnected, thereby realizing the magnetic holding function.

[0065] See Figure 12The figure shows the structure of the moving contact 2311 in one embodiment. In this embodiment, the moving contact 2311 includes a moving spring 2311c and a compression spring 2311d. The moving contact 2312 is disposed at one end of the moving spring 2311c to form the contact end 2311b of the moving contact 2311. The other end of the moving spring 2311c is connected to the second lead-out end 2313c to form the fixed end 2311a of the moving contact 2311. One end of the compression spring 2311d is connected to the part of the moving spring 2311c near the moving contact 2312, and the other end of the compression spring 2311d is connected to the push card 2232 of the armature assembly 223. The push card 2232 can push the compression spring 2311d to produce elastic deformation. By setting the compression spring 2311d, it can be ensured that the moving contact 2312 has sufficient overtravel and that sufficient pressure can be generated when the moving contact 2312 and the stationary contact 2314 are in contact, thus ensuring that the contact between the moving contact 2312 and the stationary contact 2314 remains stable.

[0066] In a preferred embodiment, combined with Figure 3 , Figure 4 and Figure 12 As shown, the thickness direction of the moving spring 2311c is parallel to the second direction; in other words, the width direction of the moving spring 2311c is parallel to the first direction. Here, "parallel" means that they are parallel or nearly parallel to each other. This arrangement utilizes the larger space inside the case 100 of the double-layer guide rail meter in the first direction, allowing the moving spring 2311c to be designed with a wider width in that direction. This allows for the placement of two or more moving contacts 2312 on the moving spring 2311c and two or more corresponding stationary contacts 2314 on the stationary contact 2313, as shown in the figure. This increases the cross-sectional area of ​​the moving spring 2311c and enhances its current-carrying capacity. Therefore, when a large short-circuit current is generated in the load circuit, the moving spring 2311c can withstand it, ensuring the normal operation of the relay 200. Furthermore, the thickness direction of the moving spring 2311c is the narrowest direction in the three-dimensional dimensions of the moving spring 2311c. By using the thickness direction of the moving spring 2311c to be parallel to the second direction, there is more space available in the second direction to design the electrical clearance between the moving contact 2312 and the stationary contact 2314.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A relay for installation in an electricity meter, characterized in that, The relay includes: The magnetic circuit section is used to provide electromagnetic force; A contact portion is provided on one side of the magnetic circuit portion along the first direction. The contact portion is used to connect the load circuit, and the contact portion has a movable contact element that can move under the action of the electromagnetic force to control the on / off state of the load circuit. A magnetic shielding plate is disposed on the side of the magnetic circuit section near the meter casing. The magnetic shielding plate is used to shield the magnetic field interference outside the meter casing.

2. The relay according to claim 1, characterized in that The contact portion includes a contact assembly, which includes a moving contact with a moving contact and a stationary contact with a stationary contact. The moving contact can move along a second or third direction perpendicular to the first direction under the drive of the electromagnetic force provided by the magnetic circuit portion, so that the moving contact can contact or separate from the stationary contact.

3. The relay according to claim 2, characterized in that, The stationary contact has a first lead-out end, and the moving contact has a second lead-out end. The first lead-out end and the second lead-out end are spaced apart along the second direction, and the direction of movement of the moving contact is consistent with the second direction. Alternatively, the stationary contact has a first lead-out end and a second lead-out end spaced apart along the third direction, the third direction being perpendicular to the second direction, and the moving contact's direction of action being consistent with the second direction; When the moving contact contacts the stationary contact in the direction of motion, the first lead-out end and the second lead-out end are connected to each other; when the moving contact separates from the stationary contact in the direction of motion, the first lead-out end and the second lead-out end are disconnected from each other.

4. The relay according to claim 3, characterized in that The contact components have at least two sets, and all the contact components are arranged side by side along the second direction.

5. The relay of claim 3, wherein The magnetic circuit portion includes a coil winding and an armature assembly, the central axis of the coil winding extends along the second direction, and the armature assembly is disposed adjacent to one side of the coil frame along the third direction.

6. The relay of claim 5, wherein The armature assembly includes an armature and a pusher connected to each other. The pusher is connected to the moving contact. The armature can rotate around a central axis extending in the first direction under the action of the electromagnetic force, so as to drive the pusher and the moving contact to swing in the second direction.

7. The relay according to claim 6, characterized in that, The coil winding includes a coil frame and a coil wound on the coil frame. At least one end of the coil frame along the second direction has a connecting portion, and a pin is provided on the connecting portion. One end of the pin is connected to the coil, and the other end is used to connect to an external circuit and extends in a straight line or bends.

8. The relay according to claim 5, characterized in that, The moving contact includes a moving spring and a compression spring. The thickness direction of the moving spring is parallel to the second direction. The moving contact is located at one end of the moving spring. One end of the compression spring is connected to the part of the moving spring near the moving contact, and the other end is connected to the armature assembly. Under the drive of the armature assembly, the compression spring can generate elastic deformation.

9. The relay according to claim 1, characterized in that, The relay also includes a housing, with at least a portion of the magnetic circuit portion and the contact portion disposed within the housing. The bottom wall of the housing is configured to be adjacent to the meter casing, and the magnetic shielding plate is disposed between the magnetic circuit portion and the bottom wall of the housing.

10. An electricity meter, characterized in that, The watch case includes a relay as described in any one of claims 1-9, the relay being disposed within the watch case.

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