Shell assembly and electric energy meter

Abstract

The utility model discloses a shell assembly and an electric energy meter, and relates to the technical field of electric energy meters, the shell assembly comprises a first shell and at least two connecting pieces, the first shell comprises a bottom plate and a peripheral wall plate connected to the bottom plate, the bottom plate and the peripheral wall plate are enclosed to form an accommodating groove, each connecting piece is provided with a first end and a second end, the first end is connected with the end, away from the bottom plate, of the peripheral wall plate, and the second end is used for being connected with a circuit board of the electric energy meter in a clamped mode so that the circuit board can be installed in the containing groove, and the at least two connecting pieces are arranged on the peripheral wall plate and suspended relative to the bottom plate, so that on one hand, the occupied space of the connecting pieces on the bottom plate can be reduced; therefore, the electrical elements on the circuit board do not need to avoid the connecting piece, the space utilization rate of the circuit board can be improved, on the other hand, the traditional scheme that holes are formed in the circuit board to fix the circuit board can be abandoned, and the layout utilization rate of the circuit board can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy meters, in particular to a shell component and an electric energy meter. Background Art

[0002] An electric energy meter is an instrument used to measure electrical energy, also known as an watt-hour meter, a fire meter, or a kilowatt-hour meter. It refers to an instrument that measures various electrical quantities. Currently, electric energy meters are becoming increasingly common in industrial production and life due to their small size, high accuracy, good reliability, and easy installation.

[0003] An electric energy meter typically consists of a housing assembly and a circuit board. The housing assembly comprises a lower housing and an upper housing that covers the lower housing. During testing, the circuit board needs to be secured to the lower housing using a connection structure to prevent it from detaching from the housing and causing damage. A common connection structure is a clip, which extends upward from the bottom plate of the lower housing and engages the circuit board. This takes up too much space within the lower housing, forcing the electrical components on the circuit board to avoid the clip, reducing the space utilization of the circuit board. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a housing assembly that can improve the space utilization of a circuit board.

[0005] The utility model also provides an electric energy meter having the housing assembly.

[0006] According to the first embodiment of the present invention, the housing assembly is used for an electric energy meter, and the housing assembly includes:

[0007] The first shell includes a bottom plate and a peripheral wall plate connected to the bottom plate, wherein the bottom plate and the peripheral wall plate enclose a receiving groove;

[0008] At least two connecting members, each having a first end and a second end, wherein the first end is connected to an end of the peripheral wall plate away from the bottom plate, and the second end is used to clamp the circuit board of the electric energy meter so that the circuit board is installed in the receiving groove.

[0009] The housing assembly according to one embodiment of the present invention has at least the following beneficial effects:

[0010] By arranging at least two connecting parts on the peripheral wall plate, the connecting parts are suspended relative to the base plate, and the circuit board is clamped on the second end of the connecting parts so that the circuit board can be installed in the first shell. On the one hand, the space occupied by the connecting parts on the base plate can be reduced, so that the electrical components on the circuit board do not need to avoid the connecting parts, which can improve the space utilization of the circuit board. On the other hand, the traditional solution of opening holes in the circuit board to fix the circuit board can be abandoned, which can improve the layout utilization of the circuit board.

[0011] According to some embodiments of the present invention, the peripheral wall plate includes a first side plate and a second side plate that are oppositely arranged, and the first side plate and the second side plate are respectively connected to the first end of the corresponding connecting member.

[0012] According to some embodiments of the present invention, the first side plate and the second side plate are both spaced apart from a side of the connecting member that is away from the opposite side of the connecting member to form an avoidance groove.

[0013] According to some embodiments of the present invention, the second end is provided with a supporting portion and an abutting portion, the abutting portion is located on the side of the supporting portion away from the base plate, the supporting portion is used to support the lower end surface of the circuit board of the electric energy meter, and the abutting portion is used to abut with the upper end surface of the circuit board.

[0014] According to some embodiments of the present invention, a guide surface is provided on a side of the abutting portion away from the supporting portion, and the distance between the guide surface and the connecting member on the opposite side gradually decreases in a direction approaching the bottom plate.

[0015] According to some embodiments of the present invention, the guide surface is provided with a pulling groove, and the pulling groove is recessed in a direction close to the bottom plate.

[0016] According to some embodiments of the present invention, the peripheral wall plate is provided with a step portion, and the first end is connected to two adjacent sides of the step portion.

[0017] According to some embodiments of the present invention, along the recessed direction of the receiving groove, the first end is located between the second end and the bottom plate.

[0018] According to some embodiments of the present invention, the bottom plate, the peripheral wall plate and the connecting piece are an integrated structure.

[0019] The electric energy meter according to the embodiment of the second aspect of the present utility model includes the housing assembly described in the above embodiment.

[0020] The electric energy meter according to the embodiment of the second aspect of the utility model has at least the following beneficial effects:

[0021] A shell assembly according to the first embodiment is adopted, by arranging at least two connecting parts on the peripheral wall plate, so that the connecting parts are suspended relative to the base plate, and the circuit board is clamped on the second end of the connecting part so that the circuit board is installed in the first shell. On the one hand, it can reduce the space occupied by the connecting parts on the base plate, so that the electrical components on the circuit board do not need to avoid the connecting parts, which can improve the space utilization of the circuit board. On the other hand, it can abandon the traditional solution of opening holes in the circuit board to fix the circuit board, which can improve the layout utilization of the circuit board.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a structural diagram of an electric energy meter according to an embodiment of the present utility model;

[0025] Figure 2 This is an exploded schematic diagram of an electric energy meter according to an embodiment of the present utility model;

[0026] Figure 3 This is a schematic diagram of the assembly of the first housing and the circuit board according to an embodiment of the present utility model;

[0027] Figure 4 This is a structural diagram of the first housing according to an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 A partial enlarged view of part A;

[0029] Figure 6 This is a top view of the first housing of an embodiment of the present utility model;

[0030] Figure 7 for Figure 6 Cross-sectional view along the midline BB;

[0031] Figure 8 for Figure 7 A partial enlarged view of part D in the middle;

[0032] Figure 9 for Figure 6 Cross-sectional view of the mid-CC line;

[0033] Figure 10 for Figure 9 A partial enlarged view of part E in the middle.

[0034] Figure Number:

[0035] The first shell 100, the accommodating groove 101, the avoidance groove 102, the bottom plate 110, the first side plate 120, the second side plate 130, the step portion 140, the connecting member 200, the first end 201, the second end 202, the supporting portion 210, the abutting portion 220, the guide surface 230, the pulling groove 240, the reinforcing rib 250, the limiting groove 260, the second shell 300, and the circuit board 400. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] In related art, an electric energy meter typically includes a housing assembly and a circuit board. The housing assembly comprises a lower housing and an upper housing covering the lower housing. During testing, the circuit board needs to be secured to the lower housing via a connection structure to prevent it from detaching from the housing and causing damage. A commonly used connection structure is a clip, which clips onto the circuit board and extends upward from the bottom plate of the lower housing. This takes up too much space within the lower housing, forcing the electrical components on the circuit board to avoid the clip, reducing the space utilization of the circuit board.

[0041] Based on this, this embodiment sets at least two connectors 200 on the peripheral wall plate so that the connector 200 is suspended relative to the base plate 110, and the circuit board 400 is clamped on the second end 202 of the connector 200 so that the circuit board 400 is installed in the first shell 100. On the one hand, it can reduce the space occupied by the connector 200 on the base plate 110, so that the electrical components on the circuit board 400 do not need to avoid the connector 200, which can improve the space utilization of the circuit board 400. On the other hand, it can abandon the traditional solution of opening holes in the circuit board 400 to fix the circuit board 400, which can improve the layout utilization of the circuit board 400.

[0042] It should be noted that the lower end surface of the circuit board 400 refers to the surface of the circuit board 400 facing the bottom plate 110 , and the upper end surface of the circuit board 400 refers to the surface of the circuit board 400 facing away from the bottom plate 110 .

[0043] Reference Figures 1 to 3 , Figure 1 and Figure 2 The following respectively show a structural diagram and an exploded diagram of an electric energy meter according to an embodiment of the present utility model. Figure 3 The figure is a schematic diagram of the assembly of the first housing 100 and the circuit board 400 according to an embodiment of the present invention. As shown in the figure, in this embodiment, the housing assembly includes a first housing 100 and at least two connectors 200. The first housing 100 includes a bottom plate 110 and a peripheral wall plate. The bottom plate 110 and the peripheral wall plate enclose a receiving groove 101. The connector 200 has a first end 201 and a second end 202. The first end 201 is connected to the peripheral wall plate, and the second end 202 is used to clamp the circuit board 400 so that the circuit board 400 can be installed in the receiving groove 101. On the one hand, it can reduce the space occupied by the connector 200 on the bottom plate 110, so that the electrical components on the circuit board 400 do not need to avoid the connector 200, which can improve the space utilization rate of the circuit board 400. On the other hand, it can abandon the traditional solution of opening holes in the circuit board 400 to fix the circuit board 400, which can improve the layout utilization rate of the circuit board 400.

[0044] In this embodiment, the second end 202 is provided with an abutting portion 220 and a supporting portion 210. The abutting portion 220 is spaced apart from the supporting portion 210. The abutting portion 220 is located on the side of the supporting portion 210 away from the base plate 110. The supporting portion 210 supports the lower end surface of the circuit board 400. The abutting portion 220 abuts against the lower end surface of the circuit board 400. The connecting member 200 is suspended relative to the base plate 110, and the traditional solution of providing a first clip and a second clip on the base plate 110 to fix the circuit board 400 can be abandoned. The space occupied by the connecting member 200 on the base plate 110 can be reduced, so that the electrical components on the circuit board 400 do not need to avoid the connecting member 200, thereby improving the space utilization of the circuit board 400.

[0045] Reference Figure 6 、 Figure 9 and Figure 10 , Figure 9 for Figure 6 Cross-sectional view of the CC line, Figure 10 for Figure 9 A partial enlarged view of section E. As shown in the figure, in this embodiment, the abutting portion 220 and the supporting portion 210 are spaced apart to form a limiting groove 260. The limiting groove 260 can avoid the edge of one side of the circuit board 400, eliminating the need to cut a groove on the edge of one side of the circuit board 400, thereby improving the layout utilization of the circuit board 400.

[0046] For example, when installing the circuit board 400, first insert one side of the circuit board 400 into one of the limit grooves 260, and then apply force to push the opposite side of the circuit board 400 so that the opposite side of the circuit board 400 is inserted into the limit groove 260 on the opposite side, and the circuit board 400 can be snapped onto the connector 200. The operation is simple, convenient and fast, which can not only improve the assembly efficiency of the circuit board 400, but also eliminate the need to groove the edge of one side of the circuit board 400, which can improve the layout utilization rate of the circuit board 400.

[0047] It should be noted that, along the concave direction of the receiving slot 101, the first end 201 is located between the second end 202 and the bottom plate 110, which can increase the distance between the bottom plate 110 and the lower end surface of the circuit board 400, thereby allowing the receiving slot 101 to accommodate more electrical components on the circuit board 400. The electrical components can be, for example, transformers, which can accommodate the capacity of the slot 101. Of course, in other specific embodiments, the second end 202 can also be located between the first end 201 and the bottom plate 110, and this is not limited here.

[0048] Reference Figures 4 to 8 , Figure 4 This is a structural diagram of the first housing 100 according to an embodiment of the present invention. Figure 5 for Figure 4 A partial enlarged view of part A in the middle. Figure 6 for Figure 4 A top view of Figure 7 for Figure 6 Cross-sectional view along line BB, Figure 8 for Figure 7 A partial enlarged view of portion D in the middle. As shown in the figure, in this embodiment, the peripheral wall plate includes a first side plate 120 and a second side plate 130 disposed opposite each other. The bottoms of the first side plate 120 and the second side plate 130 are both connected to the bottom plate 110. The first side plate 120 and the second side plate 130 are respectively connected to a connector 200. The connector 200 on the first side plate 120 is disposed opposite the connector 200 on the second side plate 130, which facilitates the installation of the circuit board 400.

[0049] For example Figure 7 As shown, in order to facilitate the disassembly of the circuit board 400, in this embodiment, the end of the first side panel 120 away from the bottom plate 110 and the end of the second side panel 130 away from the bottom plate 110 are respectively spaced apart from the corresponding connectors 200 to form an avoidance groove 102. The avoidance groove 102 can provide a deformation space for the connector 200. When the tester disassembles the circuit board 400, the tester can press the end of the connector 200 away from the bottom plate 110, so that the connector 200 is deformed in the direction close to the baffle, so that the distance between the two opposite connectors 200 is increased, and the abutment portion 220 does not abut against the upper end surface of the circuit board 400, thereby facilitating the disassembly of the circuit board 400.

[0050] It should be noted that, among the two relative connecting members 200, one end of one connecting member 200 is fixedly connected to the end of the first side plate 120 away from the bottom plate 110, and one end of the other connecting member 200 is fixedly connected to the end of the second side plate 130 away from the bottom plate 110, and the other end of the connecting member 200 is a free end, so that the connecting member 200 is elastic, and the distance between the two connecting members 200 can be elastically increased or elastically decreased, which can facilitate the installation or removal of the circuit board 400.

[0051] As another embodiment, there may be two opposing connecting members 200, one end of which is hinged to the first side panel 120, a torsion spring is provided between the connecting member 200 and the first side panel 120, and one end of the other connecting member 200 is hinged to the end of the second side panel 130 away from the bottom panel 110, a torsion spring is provided between the connecting member 200 and the second side panel 130, and the torsion spring is used to rotate the connecting member 200 in the direction of approaching the connecting member 200 on the opposite side. The distance between the two connecting members 200 can also be elastically increased or elastically decreased, which can also facilitate the installation or removal of the circuit board 400, which will not be described in detail here.

[0052] It should be noted that the two connecting members 200 may also be arranged adjacent to each other, which is not limited here.

[0053] For example Figure 7 As shown, in this embodiment, a guide surface 230 is provided at one end of the connector 200 away from the base plate 110, and the guide surface 230 is connected to the periphery of the notch of the limiting groove 260. The guide surface 230 is a slope structure. In the direction approaching the base plate 110, the minimum distance between the guide surface 230 and the connector 200 on the opposite side gradually decreases, which can guide the circuit board 400 into the limiting groove 260 to reduce the interference between the circuit board 400 and the connector 200, and can facilitate the installation of the circuit board 400, thereby improving the installation efficiency of the circuit board 400.

[0054] It should be noted that the guide surface 230 can also be replaced by a curved surface structure, which can facilitate guiding the circuit board 400 into the limiting groove 260, and is not limited here.

[0055] It is understandable that when removing the circuit board 400, the tester needs to apply a force to press the guide surface 230 so that the connector 200 moves in a direction away from the connector 200 on the opposite side. Since the guide surface 230 is a sloped structure or an arc structure, the force applied by the tester is decomposed into a first component and a second component. The direction of the first component is from the connector 200 to the direction away from the connector 200 on the opposite side, and the direction of the second component is along the direction close to the base plate 110. Of the first component and the second component, only the first component truly plays a role in driving the connector 200 to move in a direction away from the connector 200 on the opposite side. The second component cannot drive the connector 200 to move in a direction away from the connector 200 on the opposite side, which is inconvenient for removing the circuit board 400. Based on this, this embodiment provides a pulling groove 240 on the guide surface 230. The pulling groove 240 is recessed in the direction close to the base plate 110. The pulling groove 240 acts as a handle. The side wall of the pulling groove 240 can provide a force point for the tester. The tester can pull the connector 200 through the pulling groove 240 and move it in the direction away from the connector 200 on the opposite side to facilitate the removal of the circuit board 400.

[0056] For example Figure 5 、 Figure 8 As shown, in this embodiment, the side wall of the connector 200 facing the opposite side of the pulling groove 240 is perpendicular to the bottom plate 110, and the tester can apply a force to the side wall of the connector 200 facing the opposite side of the pulling groove 240. The force applied by the tester can be fully used to drive the connector 200 to move in a direction away from the connector 200 on the opposite side, which can facilitate the disassembly of the circuit board 400.

[0057] For example Figure 5 、 Figure 8 As shown, in this embodiment, one end of the support portion 210 close to the opposite connecting member 200 extends out of the limiting groove 260, that is, in the direction from the first side plate 120 to the second side plate 130, the length of the side of the support portion 210 toward the abutting portion 220 is greater than the length of the side of the abutting portion 220 toward the support portion 210. In this way, when installing the circuit board 400, the end of the support portion 210 close to the opposite connecting member 200 can position the edge of one side of the circuit board 400, so that the edge of one side of the circuit board 400 enters the limiting groove 260, which can facilitate the installation of the circuit board 400.

[0058] For example, when the tester places the circuit board 400, he or she can first place the edge of one side of the circuit board 400 against the end of the support part 210 close to the opposite connecting part 200, so that the end of the support part 210 close to the opposite connecting part 200 can pre-support the circuit board 400 to pre-position the circuit board 400. Afterwards, the tester presses the edge of the opposite side of the circuit board 400 to make the edge of one side of the circuit board 400 gradually enter the limiting groove 260. At this time, the edge of the adjacent other side of the circuit board 400 gradually moves in the direction of the limiting groove 260 close to the opposite side until the edge of the adjacent other side of the circuit board 400 rests on the support part 210 on the opposite side, which can prevent the edge of one side of the circuit board 400 from being misaligned with the support part 210, thereby facilitating the installation of the circuit board 400.

[0059] It can be understood that when the circuit board 400 is disassembled, the connection position between the first end 201 of the connector 200 and the surrounding wall plate is subjected to greater force, and the connection position between the connector 200 and the surrounding wall plate is prone to breakage. By providing a step portion 140 on the surrounding wall plate, the first end 201 is connected to the adjacent two sides of the step portion 140, so that the step portion 140 can provide support force in two directions for the connector 200, thereby improving the connection strength between the connector 200 and the surrounding wall plate, and reducing the occurrence of connector 200 breakage.

[0060] It can be understood that in this embodiment, the base plate 110, the first side plate 120, the second side plate 130 and the connecting member 200 are an integrated structure, and the first shell 100 can be formed at one time by a mold, which can reduce the number of molds to reduce the production and manufacturing costs of the molds, thereby reducing the production and manufacturing costs of the first shell 100.

[0061] For example, the base plate 110, the peripheral wall plate and the connector 200 can be integrally formed by injection molding, that is, the first shell 100 is an injection molded part. The injection molded part has high structural strength and is durable, which can increase the service life of the first shell 100, thereby increasing the service life of the electric energy meter.

[0062] Of course, in other specific embodiments, the bottom plate 110, the peripheral wall plate, and the connector 200 can also be connected by welding or bolting, which can facilitate the production of the first housing 100. The welding method includes but is not limited to resistance welding, ultrasonic welding, or laser welding.

[0063] For example Figure 5 、 Figure 8As shown, in this embodiment, a reinforcing rib 250 is provided between the support portion 210 and the connecting member 200. One side of the reinforcing rib 250 is connected to the support portion 210, and the other adjacent side of the reinforcing rib 250 is connected to the connecting member 200. This can reduce the bending deformation of the support portion 210 to improve the connection strength between the support portion 210 and the connecting member 200, thereby improving the service life of the support portion 210.

[0064] It should be noted that the reinforcing rib 250 is located on the side of the support portion 210 close to the base plate 110, so that the electrical components on the circuit board 400 do not need to avoid the reinforcing rib 250, which can improve the space utilization of the circuit board 400. It will not be repeated here.

[0065] It should be noted that the shell assembly also includes a second shell 300, which is covered on the first shell 100 to seal the accommodating groove 101. The circuit board 400 of the electric energy meter is installed in the accommodating groove 101, which can prevent the circuit board 400 from being exposed to the outside world and improve the service life of the electric energy meter.

[0066] For example, the second housing 300 is detachably connected to the first housing 100, making it easy to disassemble the second housing 300 for inspection and maintenance of the circuit board 400. For example, the first housing 100 and the second housing 300 can be detachably connected by snapping or bolting. By detachably connecting the second housing 300, it is easy for maintenance personnel to open the second housing 300 to inspect and maintain the circuit board 400. This will not be described in detail here. Of course, in other specific embodiments, the first housing 100 and the second housing 300 can also be connected by welding. In this case, the first housing 100 and the second housing 300 are not detachable, and the receiving groove 101 can be effectively sealed.

[0067] The electric energy meter of the second embodiment of the present utility model includes the housing assembly of the above embodiment.

[0068] The electric energy meter according to the second embodiment of the present invention adopts the shell assembly of the first embodiment, and a connector 200 is provided at one end of the first side plate 120 away from the bottom plate 110 and one end of the second side plate 130 away from the bottom plate 110, so that the connector 200 is suspended relative to the bottom plate 110, and the circuit board 400 is clamped between the support portion 210 and the abutment portion 220, so that the circuit board 400 is installed in the first shell 100. On the one hand, the space occupied by the connector 200 on the bottom plate 110 can be reduced, so that the electrical components on the circuit board 400 do not need to avoid the connector 200, which can improve the space utilization rate of the circuit board 400. On the other hand, the traditional solution of opening holes in the circuit board 400 to fix the circuit board 400 can be abandoned, which can improve the layout utilization rate of the circuit board 400.

[0069] Since the electric energy meter adopts all the technical solutions of the housing assembly of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0070] An embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A housing assembly for an electric energy meter, characterized in that: include: The first shell includes a bottom plate and a peripheral wall plate connected to the bottom plate, wherein the bottom plate and the peripheral wall plate enclose a receiving groove; At least two connecting members, each having a first end and a second end, wherein the first end is connected to an end of the peripheral wall plate away from the bottom plate, and the second end is used to clamp the circuit board of the electric energy meter so that the circuit board is installed in the receiving groove.

2. The housing assembly according to claim 1, wherein: The peripheral wall plate includes a first side plate and a second side plate that are opposite to each other, and the first side plate and the second side plate are respectively connected to the first end of the corresponding connecting member.

3. The housing assembly according to claim 2, wherein: The first side plate and the second side plate are both spaced apart from a side of the connecting member that is away from the opposite side of the connecting member to form an avoidance groove.

4. The housing assembly according to claim 1, wherein: The second end is provided with a supporting portion and an abutting portion, the abutting portion is located on a side of the supporting portion away from the bottom plate, the supporting portion is used to support the lower end surface of the circuit board of the electric energy meter, and the abutting portion is used to abut against the upper end surface of the circuit board.

5. The housing assembly according to claim 4, wherein: A guide surface is provided on a side of the abutting portion away from the supporting portion, and a distance between the guide surface and the connecting member on the opposite side gradually decreases in a direction approaching the bottom plate.

6. The housing assembly according to claim 5, wherein: The guide surface is provided with a pulling groove, and the pulling groove is recessed in a direction close to the bottom plate.

7. The housing assembly according to claim 1, wherein: The peripheral wall plate is provided with a step portion, and the first end is connected to two adjacent sides of the step portion.

8. The housing assembly according to claim 1, wherein: Along the recessed direction of the receiving groove, the first end is located between the second end and the bottom plate.

9. The housing assembly according to claim 1, wherein: The bottom plate, the peripheral wall plate and the connecting piece are an integrated structure.

10. Electric energy meter, characterized by: The housing assembly comprises the housing assembly according to any one of claims 1 to 9.

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