A shield, relay assembly and an electricity meter

Abstract

This utility model discloses a shielding cover, a relay assembly, and an energy meter. The shielding cover is fitted onto a relay used in the energy meter along the Y-axis. The relay has a terminal block on its front side along the Y-axis and a magnetic circuit portion. The shielding cover has a first plate and a second plate at its two ends along the Z-axis, respectively. A third plate, integrated with the first and second plates, is also provided on the rear side of the shielding cover along the Y-axis. On a projection plane perpendicular to the Z-axis, both the first and second plates cover the magnetic circuit portion. The length of the first plate along the X-axis is less than the length of the second plate along the X-axis, and the two ends of the second plate along the X-axis are flush with or protrude from the two ends of the relay along the X-axis. The relay assembly includes the aforementioned shielding cover. The energy meter includes the aforementioned relay assembly. The shielding cover of this application provides reliable anti-magnetic interference and is low in cost.

Description

Technical Field

[0001] This utility model relates to the field of relays, specifically to a shielding cover, a relay assembly, and an energy meter. Background Technology

[0002] Relays typically operate by driving an armature and moving spring based on the magnetic field generated when the coil is powered on. When a relay is installed in an electricity meter, external magnetic fields may interfere with the magnetic field generated by the coil and / or armature assembly, causing inaccurate relay operation and affecting the accuracy of the electricity meter's measurement. To address this, installing a shield on the relay can prevent external magnetic fields from interfering with the magnetic field generated by the coil, ensuring the reliability of the relay operation and the accuracy of the electricity meter. However, this shield requires a significant amount of material, resulting in high cost, or its anti-magnetic interference effect may be insufficient. Utility Model Content

[0003] The purpose of this invention is to overcome the aforementioned defects or problems in the prior art and to provide a shielding cover, a relay assembly, and an energy meter, wherein the shielding cover can provide a reliable anti-magnetic interference effect and is low in cost.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical Solution 1 and its related embodiments provide a shielding cover for being fitted onto a relay used in an electricity meter along the Y-axis direction. The relay has a terminal block on its front side along the Y-axis direction and a magnetic circuit portion. The shielding cover has a first plate and a second plate at its two ends along the Z-axis direction, respectively. The shielding cover also has a third plate integrated with the first and second plates on its rear side along the Y-axis direction. On a projection plane perpendicular to the Z-axis direction, both the first plate and the second plate cover the magnetic circuit portion. The length of the first plate along the X-axis direction is less than the length of the second plate along the X-axis direction, and the two ends of the second plate along the X-axis direction are flush with or protrude from the two ends of the relay along the X-axis direction.

[0006] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the shielding cover is provided with a fourth plate and a fifth plate at both ends along the X-axis direction, which are integrated with the second plate and / or the third plate. The fourth plate and the fifth plate are opposite to each other along the X-axis direction and are spaced apart from the first plate along the X-axis direction.

[0007] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the fourth plate and the fifth plate are both integrated with the second plate and are spaced apart from the third plate along the X-axis direction.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, the third plate includes a first region that covers only the magnetic circuit portion and a second region located on both sides of the first region along the X-axis direction. The first region is integrally formed with the first plate and the second plate, and the second region is integrally formed with only the second plate and is spaced apart from the first plate along the Z-axis direction.

[0009] Based on any one of technical solutions two to four, there is also a technical solution five. In technical solution five and its related embodiments, on the projection plane perpendicular to the X-axis direction, the fourth plate and the fifth plate at least partially cover the first plate.

[0010] Based on technical solution three or four, there is also technical solution six. In technical solution six and its related embodiments, the fourth plate and the fifth plate both protrude backward relative to the third plate along the Y-axis direction.

[0011] Based on technical solution one, there is also technical solution seven. In technical solution seven and its related embodiments, the second plate fully covers the bottom surface of the relay on the projection plane perpendicular to the Z-axis direction.

[0012] Technical solution eight and its related embodiments provide a relay assembly for use in an electricity meter, including a relay and a shielding cover as described in any one of technical solutions one to seven. The relay has a terminal block on its front side along the Y-axis direction, and the shielding cover is sleeved around the relay along the Y-axis direction.

[0013] Based on technical solution eight, there is also technical solution nine. In technical solution nine and its related embodiments, the relay is provided with a limiting groove that cooperates with the limiting of the first plate, and the limiting groove and the first plate form an anti-disengagement structure.

[0014] Based on technical solution nine, there is also technical solution ten. In technical solution ten and its related embodiments, the anti-detachment structure includes a positioning groove and a positioning protrusion that cooperates with the positioning groove; one of the positioning groove and the positioning protrusion is provided on the relay, and the other is provided on the first plate.

[0015] Based on technical solution ten, technical solution eleven is also provided. In technical solution eleven and its related embodiments, the positioning groove is provided on the first plate, and the positioning protrusion is provided on the relay; the front end of the first plate facing the second plate is provided with a guide portion that cooperates with the inclined surface of the positioning protrusion so that the first plate can deform away from the positioning protrusion.

[0016] Based on technical solution nine, there is also technical solution twelve. In technical solution twelve and its related embodiments, the limiting groove extends along the Y-axis direction, the front end of the limiting groove along the Y-axis direction is provided with a stop block, the rear end of the limiting groove along the Y-axis direction is open and provided with a guide section, and the groove spacing of the guide section gradually increases from front to back.

[0017] Technical solution thirteen and its related embodiments provide an electricity meter, characterized in that it includes a relay assembly as described in any one of technical solutions eight to twelve.

[0018] Based on technical solution thirteen, there is also technical solution fourteen. In technical solution fourteen and its related embodiments, the relay is located in the middle of the power meter along the X-axis direction.

[0019] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0020] The applicant discovered through research that the reason why the existing technology results in "more material consumption and higher cost of the shielding cover, or poor anti-magnetic interference effect" is that in the existing technology, the dimensions of the top and bottom plates of the shielding cover in the X and Y directions are generally the same or close. That is, the top and bottom plates fully or partially cover the upper and lower surfaces of the relay. If the length of the top and bottom plates is the same as or close to that of the relay, the magnetic field influence is smaller because the distance between the top surface of the relay and the top wall of the energy meter housing is usually large. Therefore, setting the full length will lead to higher costs. However, if the bottom plate, like the top plate, only covers the magnetic circuit part, the relay bottom surface is closer to the bottom wall of the energy meter housing and is more affected by the magnetic field, which may lead to poor anti-magnetic interference effect.

[0021] In technical solution one and its preferred embodiments, the shielding cover is fitted onto the relay used in the energy meter along the Y-axis direction. "Fitting" in this technical solution means that the size of the shielding cover matches the size of the relay. After fitting, the gap between the shielding cover and the corresponding surfaces of the relay is small. In this technical solution, on the projection plane perpendicular to the Z-axis direction, both the first plate and the second plate cover the magnetic circuit portion. The length of the first plate along the X-axis direction is less than the length of the second plate along the X-axis direction, and the two ends of the second plate along the X-axis direction are flush with or protrude from the two ends of the relay along the X-axis direction. That is, the projected area of ​​the first plate is smaller than the projected area of ​​the second plate. In practical applications, the first plate can be positioned near the top wall of the energy meter housing, and the second plate near the bottom wall of the energy meter housing. Thus, since the first plate covers the magnetic circuit portion, even if the top surface of the energy meter... Even with interfering magnetic fields present on one side, the first plate reliably protects the relay. By reducing the area of ​​the first plate, production materials are reduced, lowering costs. Simultaneously, the second plate can cover a large area of ​​the relay's bottom surface, with its ends flush with or protruding from the relay's X-axis ends. Therefore, when interfering magnetic fields exist on one side of the electricity meter's bottom surface or on both sides of the X-axis, the second plate can more easily guide the magnetic field into the shield and attenuate it, improving the anti-magnetic interference effect. Furthermore, a third plate, integrated with the first and second plates, is located on the rear side of the shield along the Y-axis. This prevents the third plate from sealing off either side of the relay's X-axis, ensuring that interfering magnetic fields outside the X-axis can easily enter the shield and be guided by it to form a magnetic circuit and attenuate. Additionally, the first plate only covering the magnetic circuit portion prevents the shield from affecting heat dissipation at the contact points, ensuring relay performance stability and lifespan.

[0022] In technical solution two and its preferred embodiments, the shielding cover is further provided with a fourth plate and a fifth plate, which are integrally connected to the second plate and / or the third plate, at both ends along the X-axis. The fourth plate and the fifth plate are opposite to each other along the X-axis and are spaced apart from the first plate along the X-axis. On the one hand, the fourth plate and the fifth plate can shield the magnetic field interference on both sides of the relay along the X-axis, avoid relay malfunction, and further improve the relay's anti-magnetic interference effect. Since the fourth plate and the fifth plate are spaced apart from the first plate, the external interference magnetic field can easily enter the shielding cover from the fourth plate or the fifth plate and be guided by the shielding cover to form a magnetic circuit and attenuate. On the other hand, it can increase the structural strength of the shielding cover and compensate for the decrease in structural strength of the shielding cover caused by the small area of ​​the first plate.

[0023] In technical solution three and its preferred embodiments, since the distance between the rear side of the relay along the Y-axis and the rear end of the energy meter is usually large, the fourth plate and the fifth plate are both integrated with the second plate and are spaced apart from the third plate along the X-axis. Compared with the fourth plate and the fifth plate being integrated with the third plate, the length of the third plate along the X-axis is shorter, which allows the area of ​​the third plate to be reduced while shielding the magnetic field interference of the rear side of the relay along the Y-axis, thereby reducing material costs.

[0024] In the fourth technical solution and its preferred embodiment, the third plate includes a first region covering only the magnetic circuit portion and a second region located on both sides of the first region along the X-axis direction. The first region is integrally formed with both the first and second plates, and the second region is integrally formed only with the second plate and spaced apart from the first plate along the Z-axis direction. The first region ensures the reliable anti-magnetic interference effect of the relay, while the second region takes into full account the situation where the area of ​​the relay on one side of the second plate is easily affected by external magnetic field interference. This not only improves the anti-magnetic interference effect of the relay on the second plate side, but also reduces the production material compared to the second region being integrally formed with the first plate, thereby reducing costs.

[0025] In technical solution five and its preferred embodiments, on the projection plane perpendicular to the X-axis direction, the fourth plate and the fifth plate at least partially cover the first plate, increasing the antimagnetic area of ​​the shield. After the shield is fitted onto the relay, the fourth plate and the fifth plate protrude from the surface where the relay contacts the first plate, so that the shield can guide the magnetic lines of force of the interfering magnetic field on both sides of the X-axis direction that deviate from the relay on the projection plane perpendicular to the X-axis direction, further improving the antimagnetic interference effect.

[0026] In technical solution six and its preferred embodiments, the fourth plate and the fifth plate both protrude rearward relative to the third plate along the Y-axis direction, increasing the antimagnetic area of ​​the shield. After the shield is fitted onto the relay, the fourth plate and the fifth plate protrude from the surface where the relay contacts the third plate, enabling the shield to guide the magnetic lines of force of the interfering magnetic field that deviate from the relay's projection plane perpendicular to the X-axis direction in the Y-axis direction, further improving the antimagnetic interference effect.

[0027] In technical solution seven and its preferred embodiments, on the projection plane perpendicular to the Z-axis direction, the second plate fully covers the bottom surface of the relay, avoiding magnetic interference to the bottom of the relay and improving the anti-magnetic interference effect.

[0028] Technical solution eight has the technical advantages of any one of technical solutions one through seven.

[0029] In technical solution nine and its preferred embodiments, the relay is provided with a limiting groove that cooperates with the limiting groove of the first plate. An anti-detachment structure is formed between the first plate and the limiting groove. The limiting cooperation here means that after the first plate is inserted into the limiting groove, it is limited to the limiting groove at least along the X-axis direction. The anti-detachment structure here means to prevent the first plate from detaching from the limiting groove along the Y-axis direction. This arrangement facilitates positioning of the shielding cover during its installation, thereby reducing installation difficulty. Furthermore, since the area of ​​the first plate is smaller than that of the second plate, the limiting connection between the first plate and the relay is more conducive to the deformation of the first plate compared to the limiting connection between the second plate and the relay, further reducing installation difficulty. The cooperation between the first and second plates allows the shielding cover to be limited relative to the relay along the Z-axis direction. Therefore, this arrangement ensures that the shielding cover can be securely fitted onto the relay.

[0030] In the tenth technical solution and its preferred embodiment, the anti-detachment structure includes a positioning groove and a positioning protrusion that cooperates with the positioning groove; one of the positioning groove and the positioning protrusion is located on the relay, and the other is located on the first plate, which is simple and easy to process.

[0031] In the eleventh technical solution and its preferred embodiment, the positioning groove is provided on the first plate, and the positioning protrusion is provided on the relay; the front end of the first plate facing the second plate is provided with a guide part that cooperates with the inclined surface of the positioning protrusion so that the first plate can deform away from the positioning protrusion, which is conducive to the positioning protrusion sliding over the guide part and inserting into the positioning groove, reducing the installation resistance and reducing the installation difficulty.

[0032] In the twelfth technical solution and its preferred embodiment, the limiting groove extends along the Y-axis direction, the front end of the limiting groove along the Y-axis direction is provided with a stop block, the rear end of the limiting groove along the Y-axis direction is open and provided with a guide section, the groove spacing of the guide section gradually increases from front to back, which is conducive to the first plate being inserted into the limiting groove from back to front, further reducing the installation difficulty, and the setting of the stop block allows the limiting groove to limit the first plate along the Y-axis direction, which is more conducive to the positioning of the shielding cover during the shielding cover installation process.

[0033] Technical solution thirteen has the technical advantages of any one of technical solutions eight to twelve.

[0034] In the fourteenth technical solution and its preferred embodiment, the relay is located in the middle of the power meter along the X-axis direction, so that the relay can be away from the interference magnetic field source on the outside of the X-axis direction, reducing the degree of interference. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of a relay assembly according to an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of a relay according to an embodiment of this application;

[0038] Figure 3 This is a top view of the relay in an embodiment of this application;

[0039] Figure 4 This is a three-dimensional schematic diagram of the shielding cover in an embodiment of this application. Figure 1 ;

[0040] Figure 5 This is a three-dimensional schematic diagram of the shielding cover in an embodiment of this application. Figure 2 ;

[0041] Figure 6 This is a top view of the shielding cover according to an embodiment of this application;

[0042] Figure 7 This is a front view of the shielding cover according to an embodiment of this application;

[0043] Figure 8 This is a rear view of the relay assembly according to an embodiment of this application.

[0044] Explanation of key figure labels:

[0045] Relay 10; Terminal block 11; Limiting groove 12; Positioning protrusion 121; Stop block 122; Guide section 123; Shielding cover 20; First plate 21; Positioning groove 211; Guide section 212; Second plate 22; Third plate 23; First area 231; Second area 232; Fourth plate 24; Fifth plate 25. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0047] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0048] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does 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 limiting the specific protection scope of this utility model.

[0049] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0050] In the claims, description and accompanying drawings of this utility model, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0051] In the claims and the description other than the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" only refer to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "X-axis direction," "Y-axis direction," and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the Z-axis direction. Exemplarily, the X-axis direction can be divided into left and right, the Y-axis direction can be divided into front and back, and the Z-axis direction can be divided into up and down.

[0052] See Figure 1 , Figure 1 A relay assembly for use in an electricity meter is shown, including a relay 10 and a shield 20. The shield 20 is fitted over the relay 10 along the Y-axis direction, that is, the shield 20 is used to fit over the relay 10 applied to the electricity meter along the Y-axis direction. In this embodiment, "fitting" means that the size of the shield 20 matches the size of the relay 10, so that after fitting, the gap between the corresponding surfaces of the shield 20 and the relay 10 is small.

[0053] The relay 10 is located in the middle of the energy meter along the X-axis. A terminal 11 is located on the front side of the relay 10 along the Y-axis. The relay 10 includes a magnetic circuit. The structure of the relay 10 can utilize existing technology, as long as the terminal 11 is located on the front side of the relay 10 along the Y-axis, and the magnetic circuit is located in the middle of the relay 10 along the X-axis. See also... Figure 2-3 , Figure 2-3 A schematic diagram of relay 10 is shown. Relay 10 has a limiting groove 12 at its top along the Z-axis, extending along the Y-axis. A stop block 122 is provided at the front end of the limiting groove 12 along the Y-axis, and the rear end of the limiting groove 12 opens along the Y-axis and has a guide section 123. The groove spacing of the guide section 123 gradually increases from front to back. A positioning protrusion 121 protrudes from within the limiting groove 12. The limiting groove 12 is used to limit and cooperate with the first plate 21 (described below) and forms an anti-detachment structure with the first plate 21. That is, relay 10 has a limiting groove 12 that limits and cooperates with the first plate 21, forming an anti-detachment structure between the limiting groove 12 and the first plate 21. The limiting cooperation here means that after the first plate 21 is inserted into the limiting groove 12, it is limited by the limiting groove 12 at least along the X-axis. In this embodiment, the limiting groove 12 also limits the first plate 21 along the Y-axis. The anti-detachment structure here means to prevent the first plate 21 from detaching from the limiting groove 12 along the Y-axis.

[0054] See Figure 4-5 , Figure 4-5 A three-dimensional structural diagram of the shielding cover 20 is shown. The shielding cover 20 has a first plate 21 and a second plate 22 at both ends along the Z-axis. The shielding cover 20 also has a third plate 23 integrated with the first plate 21 and the second plate 22 on the rear side along the Y-axis. The distance between the first plate 21 and the energy meter is greater than the distance between the second plate 22 and the energy meter. On the projection plane perpendicular to the Z-axis, both the first plate 21 and the second plate 22 cover the magnetic circuit. The length of the first plate 21 along the X-axis is less than the length of the second plate 22 along the X-axis. The two ends of the second plate 22 along the X-axis are flush with or protrude from the two ends of the relay 10 along the X-axis. That is, the projected area of ​​the first plate 21 is less than the projected area of ​​the second plate 22. In this embodiment, on the projection plane perpendicular to the Z-axis, the second plate 22 fully covers the bottom surface of the relay 10. The shielding cover 20 is also provided with a fourth plate 24 and a fifth plate 25 at both ends along the X-axis direction, which are integrated with the second plate 22 and / or the third plate 23. The fourth plate 24 and the fifth plate 25 are opposite to each other along the X-axis direction and are spaced apart from the first plate 21 along the X-axis direction.

[0055] In this embodiment, the first plate 21 and the second plate 22 are both perpendicular to the Z-axis direction, the third plate 23 is perpendicular to the Y-axis direction, and the fourth plate 24 and the fifth plate 25 are both perpendicular to the X-axis direction. The distance between the first plate 21 and the second plate 22 is adapted to the height dimension of the relay 10 along the Z-axis direction, and the distance between the fourth plate 24 and the fourth plate 25 along the X-axis direction is adapted to the dimension of the relay 10 along the X-axis direction.

[0056] The first plate 21 is positioned and engaged with the limiting groove 12, forming an anti-detachment structure between them. The anti-detachment structure includes a positioning groove 211 and a positioning protrusion 121 that engages with the positioning groove 211; one of the positioning groove 211 and the positioning protrusion 121 is located on the relay 10, and the other is located on the first plate 21. In this embodiment, the positioning groove 211 is located on the first plate 21, and the positioning protrusion 121 is located on the relay 10; a guide portion 212 is provided on the front end of the first plate 21 facing the second plate 22, which engages with the inclined surface of the positioning protrusion 121 to deform the first plate 21 away from the positioning protrusion 121, wherein the guide portion 212 and the positioning groove 211 are adjacent to each other. It should be understood that although this embodiment only shows the structure of the positioning groove 211 being provided on the first plate 21 and the positioning protrusion 121 being provided on the relay 10, those skilled in the art know that the positioning groove 211 can also be provided on the relay 10 and the positioning protrusion 121 can be provided on the first plate 21, in which case the guide part 212 can be provided on the relay 10.

[0057] See Figure 4 The third plate 23 includes a first region 231 covering only the magnetic circuit portion and a second region 232 located on both sides of the first region 231 along the X-axis. The first region 231 is integrally formed with both the first plate 21 and the second plate 22. The second region 232 is integrally formed only with the second plate 22 and is spaced apart from the first plate 21 along the Z-axis. The fourth plate 24 and the fifth plate 25 are both integrally formed with the second plate 22 and are spaced apart from the third plate 23 along the X-axis. See also Figure 6 , Figure 6 A top view of the shielding cover 20 is shown, in which the fourth plate 24 and the fifth plate 25 both protrude rearward relative to the third plate 23 along the Y-axis. See also Figure 7 , Figure 7 A front view of the shielding cover 20 is shown. On a projection plane perpendicular to the X-axis, the fourth plate 24 and the fifth plate 25 both at least partially cover the first plate 21. In this embodiment, the fourth plate 24 and the fifth plate 25 completely cover the first plate 21. See also Figure 8 , Figure 8 A rear view of the relay assembly is shown, with the fourth plate 24 and the fifth plate 25 protruding from the upper surface of the relay 10.

[0058] In this embodiment, on the projection plane perpendicular to the Z-axis, the first plate 21 covers the magnetic circuit portion and is covered by the second plate 22. The length of the first plate 21 along the X-axis is less than the length of the second plate 22 along the X-axis, and the two ends of the second plate 22 along the X-axis are flush with or protrude from the two ends of the relay 10 along the X-axis. In practical applications, the first plate 21 can be positioned close to the top wall of the energy meter housing, and the second plate 22 can be positioned close to the bottom wall of the energy meter housing. Thus, since the first plate 21 covers the magnetic circuit portion, even if there is an interfering magnetic field on one side of the top surface of the energy meter, the first plate 21 can reliably protect the relay 10. Under this premise, by reducing the area of ​​the first plate 21, the production materials are reduced, and the cost is lowered. In terms of cost, the second plate 22 can cover a large area of ​​the bottom surface of the relay 10, and its two ends along the X-axis are flush with or protrude from the two ends along the X-axis of the relay 10. Therefore, when there is an interfering magnetic field on one side of the bottom surface of the electricity meter or on both sides along the X-axis, the second plate 22 can more easily guide the magnetic field into the shield 20 and attenuate it, improving the anti-magnetic interference effect. The shield 20 also has a third plate 23 integrated with the first plate 21 and the second plate 22 on its rear side along the Y-axis. This prevents the third plate 23 from sealing off both sides of the relay 10 along the X-axis, ensuring that interfering magnetic fields outside the X-axis can easily enter the shield 20 and be guided by the shield 20 to form a magnetic circuit and attenuate. Furthermore, the first plate 21 only covers the magnetic circuit portion, preventing the shield 20 from affecting heat dissipation of the contact portion, ensuring the stable performance and lifespan of the relay 10.

[0059] In this embodiment, the shielding cover 20 is further provided with a fourth plate 24 and a fifth plate 25 at both ends along the X-axis direction, which are integrated with the second plate 22 and / or the third plate 23. The fourth plate 24 and the fifth plate 25 are opposite to each other along the X-axis direction and are spaced apart from the first plate 21 along the X-axis direction. On the one hand, the fourth plate 24 and the fifth plate 25 can shield the magnetic field interference on both sides of the relay 10 along the X-axis direction, avoid the relay 10 from malfunctioning, and further improve the anti-magnetic interference effect of the relay 10. Since the fourth plate 24 and the fifth plate 25 are spaced apart from the first plate 21, the external interference magnetic field can easily enter the shielding cover 20 from the fourth plate 24 or the fifth plate 25, and be guided by the shielding cover 20 to form a magnetic circuit and attenuate. On the other hand, it can increase the structural strength of the shielding cover 20.

[0060] In this embodiment, since the distance between the rear side of the relay 10 along the Y-axis and the rear end of the energy meter is usually relatively large, the fourth plate 24 and the fifth plate 25 are both integrated with the second plate 22 and spaced apart from the third plate 23 along the X-axis. This allows the area of ​​the third plate 23 to be reduced while shielding the magnetic field interference on the rear side of the relay 10 along the Y-axis, thereby reducing material costs. This also compensates for the reduced structural strength of the shielding cover 20 caused by the small area of ​​the first plate 21.

[0061] In this embodiment, the third plate 23 includes a first region 231 that covers only the magnetic circuit portion and a second region 232 located on both sides of the first region 231 along the X-axis direction. The first region 231 is integrally formed with the first plate 21 and the second plate 22. The second region 232 is integrally formed with only the second plate 22 and is spaced apart from the first plate 21 along the Z-axis direction. Compared with the fourth plate 24 and the fifth plate 25, which are both integrally connected with the third plate 23, the length of the third plate 23 along the X-axis direction is shorter. The arrangement of the first region 231 ensures the reliable anti-magnetic interference effect of the relay 10. The arrangement of the second region 232 fully considers the situation that the area of ​​the relay 10 on the second plate 22 side is easily affected by external magnetic field interference. It not only improves the anti-magnetic interference effect of the relay 10 on the second plate 22 side, but also reduces the production material compared to the second region 232 being integrally formed with the first plate 21, thereby reducing the cost.

[0062] In this embodiment, the fourth plate 24 and the fifth plate 25 both protrude from the first plate 21 in a direction away from the second plate 22, increasing the antimagnetic area of ​​the shield 20. After the shield 20 is fitted onto the relay 10, the fourth plate 24 and the fifth plate 25 protrude from the surface of the relay 10 that contacts the first plate 21, so that the shield 20 can guide the magnetic lines of force of the interfering magnetic field that deviate from the projection plane of the relay 10 on both sides of the X-axis direction, which are perpendicular to the X-axis direction, further improving the antimagnetic interference effect.

[0063] In this embodiment, the fourth plate 24 and the fifth plate 25 both protrude rearward relative to the third plate 23 along the Y-axis direction, increasing the antimagnetic area of ​​the shield 20. After the shield 20 is fitted onto the relay 10, the fourth plate 24 and the fifth plate 25 protrude from the surface of the relay 10 that contacts the third plate 23, so that the shield 20 can guide the magnetic lines of force of the interfering magnetic field that deviate from the projection plane of the relay 10 in the Y-axis direction perpendicular to the X-axis direction, further improving the antimagnetic interference effect.

[0064] In this embodiment, on the projection plane perpendicular to the Z-axis, the second plate 22 fully covers the bottom surface of the relay 10, avoiding magnetic interference to the bottom of the relay 10 and improving the anti-magnetic interference effect.

[0065] In this embodiment, the relay 10 is provided with a limiting groove 12 that cooperates with the first plate 21 for limiting. An anti-detachment structure is formed between the first plate 21 and the limiting groove 12. This arrangement facilitates positioning of the shielding cover 20 during installation, thereby reducing installation difficulty. Furthermore, since the area of ​​the first plate 21 is smaller than that of the second plate 22, the limiting connection between the first plate 21 and the relay 10 is more conducive to the deformation of the first plate 21 compared to the limiting connection between the second plate 22 and the relay 10, further reducing installation difficulty. The cooperation between the first plate 21 and the second plate 22 allows the shielding cover 20 to be limited relative to the relay 10 along the Z-axis direction. Therefore, this arrangement ensures that the shielding cover 20 can be securely fitted onto the relay 10.

[0066] In this embodiment, the anti-detachment structure includes a positioning groove 211 and a positioning protrusion 121 that cooperates with the positioning groove 211; one of the positioning groove 211 and the positioning protrusion 121 is provided on the relay 10, and the other is provided on the first plate 21, which is simple and easy to process.

[0067] In this embodiment, the positioning groove 211 is provided on the first plate 21, and the positioning protrusion 121 is provided on the relay 10; the front end of the first plate 21 facing the second plate 22 is provided with a guide portion 212 that cooperates with the inclined surface of the positioning protrusion 121 so that the first plate 21 deforms away from the positioning protrusion 121, which is conducive to the positioning protrusion 121 sliding over the guide portion and inserting into the positioning groove 211, reducing installation resistance and reducing installation difficulty.

[0068] In this embodiment, the limiting groove 12 extends along the Y-axis direction. The front end of the limiting groove 12 along the Y-axis direction is provided with a stop 122, and the rear end of the limiting groove 12 along the Y-axis direction is open and provided with a guide section 123. The groove spacing of the guide section 123 gradually increases from front to back, which is conducive to the insertion of the first plate 21 from back to front into the limiting groove 12, further reducing the installation difficulty. In addition, the setting of the stop 122 allows the limiting groove 12 to limit the first plate 21 along the Y-axis direction, which is more conducive to the positioning of the shielding cover 20 during the installation process.

[0069] This utility model also provides an electricity meter, including the aforementioned relay assembly, which inherits the technical advantages of the aforementioned relay assembly. Specifically, the relay 10 is located in the middle of the electricity meter along the X-axis direction, allowing the relay 10 to be kept away from interfering magnetic field sources on the outer side of the X-axis direction, thus reducing the degree of interference.

[0070] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A shielding cover (20) is fitted onto a relay (10) used in an electricity meter along the Y-axis direction, wherein the relay (10) has a terminal block (11) on its front side along the Y-axis direction, the relay (10) has a magnetic circuit portion, and the shielding cover (20) has a first plate (21) and a second plate (22) at both ends along the Z-axis direction, characterized in that, The shield (20) is further provided with a third plate (23) on the rear side along the Y-axis direction, which is integrated with the first plate (21) and the second plate (22). On the projection plane perpendicular to the Z-axis direction, the first plate (21) and the second plate (22) both cover the magnetic circuit part. The length of the first plate (21) along the X-axis direction is less than the length of the second plate (22) along the X-axis direction, and the two ends of the second plate (22) along the X-axis direction are flush with or protrude from the two ends of the relay (10) along the X-axis direction.

2. The shielding cover (20) as described in claim 1, characterized in that, The shield (20) is also provided with a fourth plate (24) and a fifth plate (25) at both ends along the X-axis direction, which are integrated with the second plate (22) and / or the third plate (23). The fourth plate (24) and the fifth plate (25) are opposite to each other along the X-axis direction and are spaced apart from the first plate (21) along the X-axis direction.

3. The shielding cover (20) as described in claim 2, characterized in that, The fourth plate (24) and the fifth plate (25) are both integrated with the second plate (22) and are spaced apart from the third plate (23) along the X-axis.

4. The shielding cover (20) as described in claim 3, characterized in that, The third plate (23) includes a first region (231) covering only the magnetic circuit portion and a second region (232) located on both sides of the first region (231) along the X-axis direction. The first region (231) is integrally formed with the first plate (21) and the second plate (22). The second region (232) is integrally formed with only the second plate (22) and is spaced apart from the first plate (21) along the Z-axis direction.

5. A shielding cover (20) as described in any one of claims 2-4, characterized in that, in On the projection plane perpendicular to the X-axis, the fourth plate (24) and the fifth plate (25) both at least partially cover the first plate (21).

6. A shielding cover (20) as described in claim 3 or 4, characterized in that, The fourth plate (24) and the fifth plate (25) both protrude rearward relative to the third plate (23) along the Y-axis.

7. A shielding cover (20) as described in claim 1, characterized in that, On the projection plane perpendicular to the Z-axis, the second plate (22) fully covers the bottom surface of the relay (10).

8. A relay assembly for use in an electricity meter, characterized in that, The device includes a relay (10) and a shield (20) according to any one of claims 1-7, wherein the relay (10) has a terminal (11) on its front side along the Y-axis direction, and the shield (20) is sleeved on the outside of the relay (10) along the Y-axis direction.

9. A relay assembly as claimed in claim 8, characterized in that, The relay (10) is provided with a limiting groove (12) that cooperates with the first plate (21) for limiting, and the limiting groove (12) and the first plate (21) form an anti-disengagement structure.

10. A relay assembly as claimed in claim 9, characterized in that, The anti-detachment structure includes a positioning groove (211) and a positioning protrusion (121) that cooperates with the positioning groove (211); one of the positioning groove (211) and the positioning protrusion (121) is located on the relay (10), and the other is located on the first plate (21).

11. A relay assembly as claimed in claim 10, characterized in that, The positioning groove (211) is provided on the first plate (21), and the positioning protrusion (121) is provided on the relay (10); the front end of the first plate (21) facing the second plate (22) is provided with a guide part (212) that cooperates with the inclined surface of the positioning protrusion (121) so that the first plate (21) can deform away from the positioning protrusion (121).

12. A relay assembly as claimed in claim 9, characterized in that, The limiting groove (12) extends along the Y-axis direction. The front end of the limiting groove (12) along the Y-axis direction is provided with a stop block (122). The rear end of the limiting groove (12) along the Y-axis direction is open and provided with a guide section (123). The groove spacing of the guide section (123) gradually increases from front to back.

13. An electricity meter, characterized in that, The relay assembly includes any one of claims 8-12.

14. An electricity meter as described in claim 13, characterized in that, The relay (10) is located in the middle of the power meter along the X-axis.

Images