Shielding structure of electric energy meter

Abstract

The utility model relates to a shielding structure of an electric energy meter, which comprises a first shielding plate, second shielding plates, a third shielding plate and a fourth shielding plate, the third shielding plate is positioned at the end part of the same side of the two second shielding plates, the fourth shielding plate is arranged close to the first shielding plate, and a gap is reserved between the first shielding plate and the fourth shielding plate. The gap is filled with magnetic conductive glue; a cavity is defined by the second shielding plate, the third shielding plate and the fourth shielding plate, and core components of the electric energy meter are arranged in the cavity. Different shielding plates are arranged in the shell for combination, the cavity formed by enclosure can be utilized to realize isolation of core components and non-core components, double interference generated by radiation of the non-core components and an external magnetic field is avoided, three-dimensional protection is constructed by means of the multiple shielding plates, and the external magnetic field is prevented from permeating into the shell; meanwhile, the magnetic conductive adhesive can fill a gap between the first and fourth shielding plates to prevent a magnetic field from invading from the gap; and finally, core components are effectively protected from interference.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric energy meter especially is related to a shielding structure of electric energy meter. BACKGROUND

[0002] With the deep evolution of intelligent power grid to digitization and informatization, the electric energy meter as the core metering equipment of electric power trade settlement, its metering accuracy is directly related to the operation efficiency of power enterprise and the vital interests of users, is the key node of intelligent power grid data acquisition and energy management. But the actual operation environment of intelligent electric energy meter is increasingly complex, the transformer of transformer substation, high voltage switch equipment and large motor, frequency converter of industrial plant area, etc. can continuously produce high strength power frequency magnetic field, this kind of strong magnetic field is easy to penetrate the shell of electric energy meter, causes the interference to internal current transformer, core component such as metering chip, makes the measurement error become big.

[0003] The current industry mostly relies on the shielding of the shell, only blocks the magnetic field through the external metal shell, and does not differentiate the internal components. The core metering components and non-core components with strong anti-interference ability are mixed in the same chamber without isolation. This design has obvious defects: on the one hand, the shell shielding is easy to penetrate the magnetic field from the joint gap and wiring port, which affects the core components. On the other hand, the internal mixing of non-core components and external magnetic field forms double interference, which amplifies the error. SUMMARY

[0004] To solve the above problems, the utility model provides a shielding structure of electric energy meter.

[0005] The utility model solves the technical scheme adopted by its technical problems:

[0006] A shielding structure of electric energy meter is provided in the shell of the electric energy meter. The shielding structure includes a first shielding plate arranged on the bottom plate of the shell, a second shielding plate extending into the shell from the opposite sides of the first shielding plate, a third shielding plate arranged between the two second shielding plates, and a fourth shielding plate located above the first shielding plate. The third shielding plate is located at the end of the same side of the two second shielding plates. The fourth shielding plate is arranged close to the first shielding plate. A gap is left between the first shielding plate and the fourth shielding plate, and a magnetic conductive glue is filled in the gap. The second shielding plate, the third shielding plate, and the fourth shielding plate form a chamber, and the core components of the electric energy meter are arranged in the chamber.

[0007] Further, the first shielding plate is surrounded by a mounting plate, which is annular and fixed to the shell by screws.

[0008] Further, a positioning groove is arranged in the shell, the first shielding plate is concave downward along the inner edge of the mounting plate to form a positioning protrusion on one side, and the positioning protrusion is matched with the positioning groove to realize the positioning of the first shielding plate in the shell.

[0009] Further, the first shielding plate is integrally formed with the mounting plate.

[0010] Further, a groove is arranged at each end of the third shielding plate, and the end of the second shielding plate can be inserted into the groove.

[0011] Further, a cover plate is arranged at each end of the third shielding plate, the cover plate is fixed to one side of the third shielding plate close to the first shielding plate, and the cover plate is used for covering the screw on the mounting plate; a containing cavity is formed inward on one side of the cover plate, and the containing cavity shields the corresponding mounting plate.

[0012] Further, the fourth shielding plate is arranged between the two cover plates and leaves a channel between the fourth shielding plate and the cover plates, one side of the fourth shielding plate is fixed to the bottom of the third shielding plate, and the second shielding plate can pass through the channel.

[0013] Further, a first fixing hole is arranged on the cover plate, a second fixing hole is arranged at the corresponding position of the mounting plate, and a third fixing hole is arranged at the corresponding position of the shell, the first fixing hole, the second fixing hole and the third fixing hole are aligned and fixed through a fixing piece.

[0014] Further, the fixing piece comprises a fixing rod, a fixing block at the middle part of the fixing rod and a fixing screw; a threaded hole is formed in the end of the fixing rod close to the first shielding plate along the axial direction, the fixing screw is matched with the threaded hole, and the fixing block is fixed to the cover plate.

[0015] Further, a handle is formed outward in the radial direction at the end of the fixing rod away from the first shielding plate to facilitate installation and taking.

[0016] The utility model discloses the beneficial effect is: through setting up the combination of different shielding plates in the shell, can utilize the chamber formed by the enclosure to realize the isolation of core component and non -core component, avoid non -core component radiation and external magnetic field produce double -edged sword interference, help multiple shielding plate structure builds the solid protection, and blocks the external magnetic field to the infiltration in the shell, and the magnetic glue can fill the gap between the first and fourth shielding plates, prevents the magnetic field from invading from the gap, and finally effectively protects the core component from the interference. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure diagram of the shielding structure of the utility model electric energy meter;

[0018] Figure 2 is the exploded structure schematic view of the shielding structure of the electric energy meter of the utility model;

[0019] Figure 3 is the cross-sectional structure schematic view of the shielding structure of the electric energy meter of the utility model.

[0020] In the figure: 10, first shielding plate;11, mounting plate;12, second fixed hole;13, third fixed hole;20, second shielding plate;30, third shielding plate;31, recess;40, fourth shielding plate;50, magnetically conductive glue;60, chamber;70, cover plate;80, channel;90, fixing piece;91, fixed rod;92, fixed block;93, fixed screw;94, handle;100, shell;110, positioning groove. DETAILED DESCRIPTION

[0021] The technical solutions of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. The direction of movement is also a relative direction of movement, and does not limit the absolute direction of movement. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, the technical features involved in different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] AsFigure 1 、 Figure 2 and Figure 3 The application provides a shielding structure of an electric energy meter, which is arranged in the inside of a housing 100 of the electric energy meter and can form a double-layer shielding structure in combination with the housing 100. The shielding structure comprises a first shielding plate 10 arranged on the bottom plate of the housing 100, a second shielding plate 20 extending into the inside of the housing 100 from the opposite sides of the first shielding plate 10, a third shielding plate 30 arranged between the two second shielding plates 20, and a fourth shielding plate 40 located above the first shielding plate 10. The first shielding plate 10 serves as a bearing component and is fixed on the bottom plate of the housing 100 of the electric energy meter, thereby providing support for the assembly of other shielding plates and blocking the penetration of external magnetic fields from the bottom. The second shielding plate 20 directly blocks the horizontal magnetic field interference from the left and right sides of the electric energy meter. The third shielding plate 30 is located at the end of the same side of the two second shielding plates 20, thereby separating the inside of the electric energy meter into an upper region and a lower region. The upper region is used to place non-core components, and the lower region is used to place core components, such as metering chips and current transformers. The fourth shielding plate 40 is arranged in parallel with the first shielding plate 10, and a gap is left between the first shielding plate 10 and the fourth shielding plate 40. The gap is filled with a magnetic conductive glue 50, which can not only fill the magnetic field penetration channels 80 at the gap but also enhance the structural stability between the first shielding plate 10 and the fourth shielding plate 40.

[0025] The second shielding plate 20, the third shielding plate 30, and the fourth shielding plate 40 form a cavity 60, and the core components of the electric energy meter are arranged in the cavity 60. The top surface and the lower surface of the cavity 60 are in an open state to facilitate the installation of components and wiring operations. Further, the corresponding shielding plate can be designed to be closed according to the needs. The shielding plate can be directly fixed on the housing 100 to achieve closure by combining the housing 100, and details are not described herein.

[0026] As an embodiment of the application, a mounting plate 11 is arranged around the first shielding plate 10. The mounting plate 11 has a ring structure and extends outward along the edge of the first shielding plate 10 to form a flat mounting reference surface. In actual assembly, a screw hole is arranged on the mounting plate 11. A screw is passed through the screw hole and fastened and connected with the bottom plate of the housing 100 of the electric energy meter, thereby realizing the fixation between the first shielding plate 10 and the housing 100.

[0027] In order to quickly position the first shielding plate 10 on the shell 100 and avoid position deviation during assembly, a positioning groove 110 is arranged in the installation area of the first shielding plate 10 in the electric energy meter shell 100. The first shielding plate 10 is recessed along the inner edge of the annular mounting plate 11, and the side of the first shielding plate 10 (towards the side of the bottom plate of the shell 100) naturally forms a protruding positioning bump after being recessed. The shape and size of the positioning bump are adapted to the positioning groove 110 in the shell 100. When installing the first shielding plate 10, only the positioning bump needs to be aligned and embedded in the positioning groove 110 of the shell 100, and the positioning of the first shielding plate 10 in the shell 100 can be quickly completed through the embedded cooperation of the two, and then the annular mounting plate 11 is fixed.

[0028] As an embodiment of the present application, the first shielding plate 10 and the mounting plate 11 around it are manufactured by an integral molding process. They can also be separately manufactured and connected by welding as needed.

[0029] As an embodiment of the present application, recesses 31 adapted to the second shielding plate 20 are arranged at both ends of the third shielding plate 30. The recesses 31 are arranged at positions corresponding to the end positions of the second shielding plate 20, so that the ends of the second shielding plate 20 can be smoothly inserted into the recesses 31, realizing the splicing of the third shielding plate 30 and the second shielding plate 20. The cooperation gap between the recesses 31 and the second shielding plate 20 is a bending type structure, which can effectively block the magnetic field from invading from the splicing gap between the third shielding plate 30 and the second shielding plate 20.

[0030] As an embodiment of the present application, a cover plate 70 is arranged at each end of the third shielding plate 30. The two cover plates 70 are symmetrically distributed. The fixing position of the cover plate 70 is limited on the side of the third shielding plate 30 close to the first shielding plate 10, and the cover plate 70 is fixed on the third shielding plate 30. The cover plate 70 can move with the third shielding plate 30. One side of the cover plate 70 is recessed inward to form a containing cavity. The size of the containing cavity is matched with the shape of the corresponding side mounting plate 11. When the cover plate 70 is installed in place, the containing cavity can completely wrap and shield the corresponding side mounting plate 11, and also shield the screws on the mounting plate 11. The edge of the mounting plate 11 and the screws can be hidden, the small gap at the connection is shielded, the magnetic field is further blocked, and the shielding effect is improved.

[0031] As an embodiment of the present application, the fourth shielding plate 40 is correspondingly adapted to the cover plates 70 at both ends of the third shielding plate 30, is arranged in the area between the two cover plates 70, and a passage 80 for the second shielding plate 20 to pass through is respectively reserved between the fourth shielding plate 40 and the two cover plates 70; one side of the fourth shielding plate 40 is fixedly connected with the bottom of the third shielding plate 30 by welding; the second shielding plate 20 can be inserted into the passage 80 reserved between the fourth shielding plate 40 and the cover plate 70 during assembly, and the thickness of the second shielding plate 20 is slightly smaller than the width of the passage 80, so that the second shielding plate 20 can be smoothly inserted or extracted, installation is convenient and the structure is compact, and the shielding effect can be ensured.

[0032] As an embodiment of the present application, a first fixing hole is formed in a corresponding position of the cover plate 70, the first fixing hole is a through hole penetrating the cover plate 70, a second fixing hole 12 is formed in a corresponding position of the mounting plate 11, and a third fixing hole 13 is formed in a corresponding position of the electric energy meter shell 100, the first fixing hole, the second fixing hole 12 and the third fixing hole 13 are aligned and fixed by a fixing piece 90.

[0033] The fixing piece 90 is composed of a fixing rod 91, a fixing block 92 and a fixing screw 93, wherein the fixing block 92 is integrally formed at the middle position of the fixing rod 91, forms a radially protruding structure and is fixed on the cover plate 70, and the fixing rod 91, the fixing block 92 and the cover plate 70 form an integrated body and can be moved simultaneously; a threaded hole is formed in the end of the fixing rod 91 close to the first shielding plate 10 along the axial direction; before assembly, the end of the fixing rod 91 first penetrates the first fixing hole, and then the fixing block 92 and the cover plate 70 are fixed by welding; a handle 94 is formed on the end of the fixing rod 91 away from the first shielding plate 10 in the radial direction to facilitate installation and taking out.

[0034] During assembly, the end of the fixing rod 91 needs to penetrate the second fixing hole 12 on the mounting plate 11 and finally insert into the third fixing hole 13 on the shell 100, the fixing screw 93 is screwed from the outside of the shell 100 to align with the third fixing hole 13, the fixing screw 93 is screwed with the threaded hole in the end of the fixing rod 91, and the axial force generated by screwing locks the cover plate 70, the mounting plate 11 and the shell 100; the third fixing hole 13 on the shell 100 is a countersunk hole, when the fixing screw 93 is completely screwed in, the head of the fixing screw 93 can be completely embedded in the countersunk hole and does not protrude from the outer surface of the shell 100, which ensures the flatness of the appearance of the electric energy meter shell 100.

[0035] First shield plate 10 with installation plate 11 is placed in the electric energy meter shell 100, the positioning bump of first shield plate 10 is matched with the positioning groove 110 to complete the preliminary positioning, then installation plate 11 is fixed with shell 100 through screw, the fixing of first shield plate 10 is completed;The first shield plate 10 is evenly filled with a proper amount of magnetic conductive glue 50;The upper combined structure composed of second shield plate 20, third shield plate 30, fourth shield plate 40 and cover plate 70 is aligned and assembled as a whole by lifting handle 94, fourth shield plate 40 is close to first shield plate 10 and is attached with magnetic conductive glue 50, second shield plate 20 passes through the passage 80 between fourth shield plate 40 and cover plate 70 and the end is inserted into the groove 31 at both ends of third shield plate 30 at this time, the fixed rod 91 passes through second fixed hole 12, third fixed hole 13 in turn, the fixed screw 93 is screwed into the threaded hole at the end of fixed rod 91, until the head of fixed screw 93 completely enters the countersunk hole of shell 100 and does not protrude from the surface of shell 100, the assembly of the whole shielding structure is completed.

[0036] By setting different shield plates in the shell 100, the core components and non-core components can be isolated by the cavity 60 formed by the enclosure, the double interference of non-core components radiation and external magnetic field is avoided, the shielding structure is constructed by the multiple shield plates, the external magnetic field is blocked from penetrating into the shell 100, the magnetic conductive glue 50 can fill the gap between the first and fourth shield plates 40 to prevent the magnetic field from invading from the gap, and the core components are finally effectively protected from interference;The first shield plate 10 is prepositioned by the positioning bump matched with the positioning groove 110 in the shell 100, the cover plate 70, the installation plate 11 and the shell 100 are aligned and locked by the fixing part 90, the fixed screw 93 is matched with the countersunk hole of the shell 100 to avoid the head protruding;The lifting handle 94 at the end of the fixed rod 91 can be conveniently taken and placed without additional tools, the passage 80 between the fourth shield plate 40 and the cover plate 70 is reserved for the smooth passage of the second shield plate 20, the groove 31 at the end of the third shield plate 30 can also be connected with the second shield plate 20, and the space utilization is improved.

[0037] It should be emphasized that: the above is only a preferred embodiment of the present application, not any form of limitation on the present application, any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. A shielding structure of an electric energy meter, disposed in a housing (100) of the electric energy meter, characterized in that, The shielding structure comprises a first shielding plate (10) arranged on the bottom plate of the shell (100), second shielding plates (20) extending into the shell (100) from the opposite sides of the first shielding plate (10), a third shielding plate (30) arranged between the two second shielding plates (20), and a fourth shielding plate (40) arranged above the first shielding plate (10), the third shielding plate (30) is arranged at the end of the same side of the two second shielding plates (20), the fourth shielding plate (40) is arranged close to the first shielding plate (10), a gap is left between the first shielding plate (10) and the fourth shielding plate (40), and a magnetic conductive glue (50) is filled in the gap, the second shielding plate (20), the third shielding plate (30) and the fourth shielding plate (40) form a cavity (60), and the core components of the electric energy meter are arranged in the cavity (60).

2. The shielding structure of the electric energy meter according to claim 1, characterized in that, The first shielding plate (10) is provided with a mounting plate (11) around the periphery, the mounting plate (11) is annular and is fixed to the shell (100) by screws.

3. The shielding structure of the electric energy meter according to claim 2, characterized in that, A positioning groove (110) is arranged in the shell (100), the first shielding plate (10) is recessed downward along the inner edge of the mounting plate (11) so that a positioning protrusion is formed on one side, and the positioning protrusion is matched with the positioning groove (110) to realize positioning of the first shielding plate (10) in the shell (100).

4. The shielding structure of the electric energy meter according to claim 3, characterized in that, The first shielding plate (10) and the mounting plate (11) are in an integrated structure.

5. The shielding structure of the electric energy meter according to claim 2, characterized in that, Grooves (31) are arranged at the two ends of the third shielding plate (30), and the ends of the second shielding plates (20) can be inserted into the grooves (31).

6. The shielding structure of the electric energy meter according to claim 5, characterized in that, Cover plates (70) are arranged at the two ends of the third shielding plate (30), the cover plates (70) are fixed to the side of the third shielding plate (30) close to the first shielding plate (10), and the cover plates (70) are used for covering the screws on the mounting plate (11); one side of the cover plate (70) is inwardly formed with a containing cavity, and the containing cavity shields the mounting plate (11) on the corresponding side.

7. The shielding structure of the electric energy meter according to claim 6, characterized in that, The fourth shielding plate (40) is arranged between the two cover plates (70) and leaves a passage (80) between the fourth shielding plate (40) and the cover plates (70), one side of the fourth shielding plate (40) is fixed to the bottom of the third shielding plate (30), and the second shielding plate (20) can pass through the passage (80).

8. The shielding structure of the electric energy meter according to claim 7, characterized in that, First fixing holes are arranged on the cover plates (70), second fixing holes (12) are arranged at the corresponding positions of the mounting plates (11), and third fixing holes (13) are arranged at the corresponding positions of the shell (100), the first fixing holes, the second fixing holes (12) and the third fixing holes (13) are aligned and are fixed by fixing members (90).

9. The shielding structure of the electric energy meter according to claim 8, characterized in that, The fixing member (90) comprises a fixing rod (91), a fixing block (92) arranged at the middle of the fixing rod (91), and a fixing screw (93), a threaded hole is formed in the end of the fixing rod (91) close to the first shielding plate (10) along the axial direction, the fixing screw (93) is matched with the threaded hole, and the fixing block (92) is fixed to the cover plate (70).

10. The shielding structure of the electric energy meter according to claim 9, characterized in that, A handle (94) is formed radially outwardly at the end of the fixed rod (91) away from the first shielding plate (10) to facilitate installation and taking out.

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