A shell structure of an electric energy meter, an electric energy meter, and a method for manufacturing the shell of the electric energy meter

Abstract

The present invention discloses a shell structure of an electric energy meter, including a rear shell and a front shell, one of the front shell and the rear shell has a plug-in portion and the other has a slot that is plugged with the plug-in portion; the slot wall of the slot includes a bottom wall and an outer extension wall, and the outer extension wall is at least partially recessed toward the bottom wall to form a recessed portion; the plug-in portion has a first end, and when the rear shell and the front shell are connected, the first end of the plug-in portion is accommodated in the slot, the plug-in portion is fixedly connected to the slot wall of the slot, and the outer side wall of the plug-in portion is at least partially exposed to the recessed portion in the front-to-back direction. It is convenient to see the traces of prying the meter from the appearance of the shell, so that it is easy to see from the appearance of the shell whether a prying event has occurred. The present invention also discloses an electric energy meter, which is convenient to see the traces of prying the meter from the appearance of the shell and know whether a prying event has occurred. The present invention also discloses a shell manufacturing method for an electric energy meter, which is used for laser welding.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy meters, and in particular to a shell structure of an electric energy meter, an electric energy meter and a method for manufacturing the shell of the electric energy meter. Background Art

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

[0003] For example, the Chinese utility model with application number CN202020714589.2 (publication number CN213023271U) discloses "An electric energy meter", which includes a base with an opening on the front side; a meter cover, which is arranged at the opening and connected to the base, and is used to open or close the opening; a plug-in convex part and a receiving port are arranged between the lower wall plate of the meter cover and the joint surface of the base, a spacing is arranged between the base and the meter cover at a position above the convex part, a gap is arranged between the base and the meter cover at a position above the spacing, and a retaining rib is arranged in the spacing to block the gap. This patent reduces the possibility of continuing to pry the meter.

[0004] However, if the electric energy meter of the above patent is pried, the structure of the shell is relatively intact, so it is not easy to see the prying marks from the appearance of the shell, and it is not easy to tell from the appearance of the shell whether the prying incident has occurred.

[0005] Therefore, the shell structure of the electric energy meter, the electric energy meter, and the shell manufacturing method of the electric energy meter can be further improved. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a shell structure of an electric energy meter that is convenient for detecting the traces of tampering from the appearance of the shell, so that it is easy to detect from the appearance of the shell whether a tampering event has occurred.

[0007] The second technical problem to be solved by the present invention is to provide an electric energy meter with the shell structure of the above-mentioned electric energy meter in view of the current status of the prior art, so that it is easy to see the traces of tampering from the appearance of the shell, so that it is easy to see from the appearance of the shell whether a tampering incident has occurred.

[0008] The third technical problem to be solved by the present invention is to provide a method for manufacturing a shell of an electric energy meter in view of the current status of the prior art.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a shell structure of an electric energy meter, comprising

[0010] A rear housing having an opening at its front side;

[0011] A front housing, a cover is arranged at the opening and is fixedly connected to the rear housing for closing the opening, one of the front housing and the rear housing has a plug-in portion, and the other of the front housing and the rear housing has a slot that is plugged with the plug-in portion;

[0012] Features:

[0013] The slot wall of the slot includes a bottom wall and an outer extension wall extending from the outer side of the bottom wall toward the front and rear of the plug-in portion, wherein the outer extension wall is at least partially recessed toward the bottom wall to form a recessed portion, and the outer side wall of the plug-in portion is at least partially exposed in the front and rear direction from the recessed portion;

[0014] The plug-in portion has a first end portion inserted into the slot, the first end portion of the plug-in portion is accommodated in the slot, and the plug-in portion is fixedly connected to a slot wall of the slot.

[0015] In order to facilitate positioning and improve the tolerance of connection processes, the slot wall of the slot also includes an inner extension wall extending from the inner side of the bottom wall toward the front and rear of the plug-in part. By providing the inner extension wall, the positioning and installation of the plug-in part are facilitated. In addition, the front shell and the rear shell can be applied to a variety of connection processes to achieve a fixed connection between the front shell and the rear shell, and the tolerance of the process is good. For example, the plug-in part and the slot bottom can be ultrasonically welded, or glue can be dispensed in the slot, and the plug-in part and the slot can be sealed by gluing, or a laser can pass through the recessed part to weld the inner extension wall of the slot to the plug-in part.

[0016] In order to facilitate the application of force by an external tool when assembling the front shell and the rear shell, the plug-in portion also has a second end away from the slot, and the shell corresponding to the plug-in portion also has an extension portion extending from the second end of the plug-in portion toward the inner side of the shell, and the extension portion is close to the inner extension wall in the front-to-back direction. By providing the extension portion, when assembling the front shell and the rear shell, an external tool can act on the extension portion to facilitate connecting the front shell and the rear shell.

[0017] In order to make the housing easy to be damaged when the watch is pried, the inner side wall of the housing where the plug-in portion is located is recessed toward the second end of the plug-in portion to form a thinning portion. By providing the thinning portion, when the tool pries the watch, the housing is easily damaged at the position of the thinning portion.

[0018] The recessed portion can be arranged at different positions. In order to further facilitate observation of the position of the damaged rear shell of the prying watch, the recessed portion is located in the middle of the outer extension wall. By arranging the recessed portion in the middle, it is convenient to observe the position of the damaged rear shell of the prying watch.

[0019] In order to fix the rear housing and the front housing together, the end surface of the first end portion of the plug-in portion is fixedly connected to the bottom wall via a first connection structure.

[0020] There may be multiple first connection structures. Preferably, an ultrasonic sealing line extending toward the bottom wall is provided at the end surface of the first end portion of the plug-in portion, and the fixed connection between the two is achieved by ultrasonic welding;

[0021] Alternatively, the end surface of the first end portion of the plug-in portion is fixedly connected to the bottom wall by means of a sealant.

[0022] In order to connect the rear housing and the front housing, the inner side wall of the first end portion of the plug-in portion is fixedly connected to the inner extension wall corresponding to the slot via a second connection structure.

[0023] There may be multiple types of second connection structures. Preferably, the second fixed connection structure is ultrasonic welding or sealant bonding.

[0024] In order to connect the rear housing and the front housing, the outer side wall of the first end portion of the plug-in portion is fixedly connected to the outer extension wall corresponding to the slot via a third connection structure.

[0025] There may be multiple third connection structures. Preferably, the third connection structure is ultrasonic welding or sealant bonding.

[0026] In order to prevent the prying tool from easily contacting the slot, the housing corresponding to the slot is provided with a boss on the upper side or / and the lower side of the slot for shielding the bottom wall in the vertical direction, the boss extending forward and backward, and the boss being closer to the extension portion than the bottom wall. In this way, when prying the watch, the prying tool will first contact the boss and will not easily contact the slot, making it difficult to pry the watch open.

[0027] The shell corresponding to the plug-in portion may have a variety of structures. Preferably, the shell corresponding to the plug-in portion has a notch portion that matches the position and shape of the boss, and the notch portion extends forward and backward.

[0028] In order to shield the outer wall of the plug-in part, the outer extension wall also has a shielding part connected to the corresponding boss and extending up and down. The shielding part is used to shield the outer wall of the plug-in part in the left and right directions. The shielding part is flush with the extension part in the left and right directions. By setting the shielding part to shield the outer wall of the plug-in part, the position between the plug-in part and the boss is hidden, and the prying tool is not easy to act on the position between the plug-in part and the boss. In addition, the shielding part also has a reinforcing effect on the outer wall of the plug-in part, so that the plug-in part or the position near the plug-in part is easy to break and easy to be observed through the recessed part.

[0029] In order to facilitate installation and positioning, the housing corresponding to the plug-in portion also has a flange extending from the inner side of the extension portion to the front and rear of the housing corresponding to the slot;

[0030] When the rear housing and the front housing are connected, the flange is located on the inner side of the inner extension wall corresponding to the slot and is close to the inner extension wall in the left-right direction.

[0031] By providing the flange, the housing corresponding to the plug-in part is easily positioned when being installed, thereby making the installation faster.

[0032] In order to reduce the number of locations that are easily damaged when a watch is pried, the plug-in portion is located on the side wall of the corresponding shell, the upper edge of the shell corresponding to the plug-in portion has a first connection surface, and the lower edge of the shell corresponding to the plug-in portion has a second connection surface;

[0033] After the front shell and the rear shell are fixedly connected, the first connection surface and the second connection surface are both opposite to the shell corresponding to the slot in the front-to-back direction;

[0034] One of the first connecting surface and the second connecting surface is located further forward than the front surface of the extension portion in the front-rear direction.

[0035] The other of the first connection surface and the second connection surface is located further rearward in the front-rear direction than the front surface of the extension portion.

[0036] In this way, by staggering the positions of the first connection surface and the second connection surface, when the prying tool pries the meter from different connection surfaces, the positions that are prone to damage are different, so that the entire electric energy meter has more positions that are prone to damage and can be easily discovered from the appearance.

[0037] The technical solution adopted by the present invention to solve the above second technical problem is: an electric energy meter, characterized in that: the shell structure of the electric energy meter as mentioned above is adopted.

[0038] The technical solution adopted by the present invention to solve the above-mentioned third technical problem is: a method for manufacturing the shell of an electric energy meter, adopting the shell structure of the electric energy meter as mentioned above, characterized in that: the plug-in part and the inner extension wall of the slot are connected by laser welding, specifically: the light path of the laser passes through the recessed part and irradiates the plug-in part, so that the inner side wall of the plug-in part is adhered to the inner extension wall of the slot.

[0039] In order to facilitate the laser to pass through the plug-in part and the inner extension wall of the slot to absorb energy, the plug-in part is made of transparent material and the inner extension wall of the slot is made of non-transparent material. The plug-in part is made of transparent material to facilitate the laser to pass through, and the inner extension wall is made of non-transparent material to absorb energy and partially melt, thereby bonding the two.

[0040] Compared with the prior art, the advantages of the present invention are as follows: by providing a slot and a plug-in portion, the plug-in portion is fixedly connected to the slot wall of the slot, so that the position of the fixed connection is hidden and not easily observed directly, so that it is not easy to find a position suitable for prying the meter, and the position of the fixed connection is not easily directly contacted by a prying tool; after the prying tool acts on the shell, it is easy to break at the plug-in portion or a position near the plug-in portion and is easily observed through the recessed portion, so that it is easy to see the prying traces from the appearance of the shell, and it is easy to see from the appearance of the shell whether a prying event has occurred, which has the function of preventing the meter from being pried and electricity from being stolen.

[0041] In the improved solution, the slot further includes an inner extension wall, so that the front shell and the rear shell can be applied to a variety of connection processes to achieve fixed connection between the front shell and the rear shell, and the process tolerance is good. For example, the plug-in portion and the slot bottom can be ultrasonically welded, or glue can be dispensed in the slot, and the plug-in portion and the slot can be sealed by gluing, or a laser can pass through the recessed portion to weld the inner extension wall of the slot to the plug-in portion;

[0042] By providing the boss, it is convenient to protect the position where the slot and the plug-in part are fixedly connected. When the meter is pried open, the tool for prying the meter first contacts the boss, and is blocked by the boss and is not easy to extend into the slot, making it difficult to contact the fixed connection position. In this way, the rear shell and the front shell are not easy to separate, thereby reducing the possibility of the electric energy meter being pried open.

[0043] The electric energy meter using the shell structure of the electric energy meter described above also has the advantage that it is easy to see the traces of tampering from the appearance of the shell, and it is easy to see from the appearance of the shell whether a tampering event has occurred.

[0044] The shell manufacturing method of the electric energy meter is to make the inner wall of the plug-in part adhere to the inner extension wall of the slot by irradiating the laser light path through the recessed part to the plug-in part. Because the recessed part is used for the laser to pass through, the adhesion area is larger, which is conducive to the stable connection of the front shell and the rear shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A three-dimensional schematic diagram of an electric energy meter to which the housing structure of the electric energy meter according to an embodiment of the present invention is applied;

[0046] Figure 2 for Figure 1 Schematic diagram from another angle;

[0047] Figure 3 for Figure 2 A cross-sectional view of

[0048] Figure 4 for Figure 3 Exploded diagram of

[0049] Figure 5 for Figure 2 Exploded diagram of

[0050] Figure 6 Schematic diagram of the rear housing in the embodiment of the present invention (excluding the circuit board in the rear housing);

[0051] Figure 7 for Figure 6 Schematic diagram from another angle;

[0052] Figure 8 for Figure 6 A schematic diagram from another angle;

[0053] Fig. 9 Schematic diagram of the front shell in the embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below with reference to the accompanying drawings.

[0055] like Figures 1 to 9 FIG. 1 is a preferred embodiment of an electric energy meter using the shell structure of the electric energy meter of the present invention.

[0056] The electric energy meter includes a housing structure of the electric energy meter, a circuit board (not shown in the figure), etc.

[0057] The shell structure of the electric energy meter includes a rear shell 2 and a front shell 1.

[0058] The rear housing 2 has an opening 2a at its front side. The rear housing 2 has a slot 21, a boss 22, etc. The slot 21 is plugged and matched with the plug-in portion 11 described below.

[0059] See also Figure 3 , Figure 4 The slot wall of the slot 21 includes a bottom wall 211, an inner extension wall 213 extending from the inner side of the bottom wall 211 toward the plug-in portion 11, and an outer extension wall 212 extending from the outer side of the bottom wall 211 toward the plug-in portion 11. The outer extension wall 212 is partially recessed toward the bottom wall 211 to form a recessed portion 212a. Preferably, in order to facilitate observation of the rupture position, the recessed portion 212a is located in the middle of the outer extension wall 212. The boss 22 is provided on the rear housing 2, located at the upper and lower sides of the slot 21 and used to shield the bottom wall 211 in the up-down direction. The boss 22 extends forward and backward, and is closer to the extension portion 12 of the front housing 1 described below than the bottom wall 211, that is, the front side of the boss 22 is closer to the front than the bottom wall 211. The outer extension wall 212 has a shielding portion 212b extending up and down and connected to the corresponding boss 22. The two shielding portions 212b are respectively used to shield the upper outer wall and the lower outer wall of the plug-in portion 11 in the left and right directions. The two shielding portions 212b are flush with the extension portion 12 in the left and right directions ( Figure 1 ).

[0060] The front shell 1 cover is arranged at the opening 2a and is fixedly connected to the rear shell 2, and the front shell 1 is used to close the opening 2a. The front shell 1 has a plug-in portion 11, and the plug-in portion 11 has a first end 11a inserted into the slot 21 and a second end 11b away from the slot 21. The end face of the first end 11a of the plug-in portion 11 is fixedly connected to the bottom wall 211 by a first connecting structure. In this embodiment, an ultrasonic sealing line 15 extending toward the bottom wall 211 is provided at the end face of the first end 11a of the plug-in portion 11, and the fixed connection between the two is achieved by ultrasonic welding. In other embodiments, ultrasonic welding can also be replaced by laser welding. The front shell 1 also has an extension portion 12 extending laterally from the second end 11b of the plug-in portion 11 toward the inner side of the front shell 1, a flange 13 extending from the inner side of the extension portion 12 toward the front and rear of the rear shell 2, and a notch portion 14 adapted to the position and shape of the boss 22 of the rear shell 2 (see Figure 5 ), the notch 14 extends forward and backward to accommodate the boss 22. The inner side wall of the housing (the front housing 1 in this embodiment) where the plug-in portion 11 is located is recessed toward the second end 11b of the plug-in portion 11 to form a thinned portion 11c ( Figure 4 ), when the tool is used to pry the watch, the front shell 1 is easily damaged near the thinning portion 11c. When ultrasonic welding is adopted, the ultrasonic welding tool can be supported by the extension portion 12, and the length of the plug-in portion 11 in the front-to-back direction is preferably less than 20mm, so that it is convenient for the ultrasonic welding tool to melt the ultrasonic sealing line 15.

[0061] See also Figure 3 When the rear shell 2 and the front shell 1 are connected, the first end 11a of the plug-in portion 11 is accommodated in the slot 21, the plug-in portion 11 is fixedly connected to the slot wall of the slot 21, the extension portion 12 is close to the inner extension wall 213 in the front-to-back direction, the outer side wall of the plug-in portion 11 is partially exposed in the recessed portion 212a in the front-to-back direction, and the flange 13 is located on the inner side of the inner extension wall 213 of the rear shell 2 and close to the inner extension wall 213 in the left-right direction.

[0062] In order to make the vulnerable positions more numerous and easier to observe from the appearance, the plug-in portion 11 is located on the side wall of the front housing 1 (in this embodiment, the left and right walls of the front housing 1 are both provided with the plug-in portion 11), and the upper edge of the front housing 1 has a first connecting surface 1a ( Fig. 9 ), the lower edge of the front housing 1 has a second connecting surface 1b ( Fig. 9 ); After the front housing 1 and the rear housing 2 are fixedly connected, the first connection surface 1a and the second connection surface 1b are opposite to the rear housing 2 in the front-to-back direction; the first connection surface 1a is located further forward than the front surface of the extension 12 in the front-to-back direction, and the second connection surface 1b is located further backward than the front surface of the extension 12 in the front-to-back direction. In this way, if the prying tool pries from the first connection surface 1a, Figure 2The arrow A in the middle indicates the position of the tool prying table, and the surface 1c ( Figure 2 ) is easily damaged, especially near the thinning portion 11c; if the prying tool pries from the second connecting surface 1b, Figure 2 The middle arrow B indicates the position of the tool prying the table, and the front housing 1 is easily damaged at the plug-in portion 11 or the position where the plug-in portion 11 is connected to the extension portion 12. In other embodiments, the first connection surface 1a may be located further back than the front surface of the extension portion 12 in the front-to-back direction, and the second connection surface 1b may be located further forward than the front surface of the extension portion 12 in the front-to-back direction.

[0063] In other embodiments, the plug-in portion 11 may be located on the rear housing 2 , and the slot 21 may be located on the front housing 1 .

[0064] The working principle and usage of the electric energy meter are as follows.

[0065] During installation, the plug-in part 11 is inserted into the slot 21 and ultrasonic welding is performed at the position of the ultrasonic sealing line 15 to achieve a fixed connection between the rear shell 2 and the front shell 1. The ultrasonic welding tool can rest on the extension part 12, and the two are further fixed by a lead sealing screw (not shown in the figure).

[0066] Because the ultrasonic sealing line 15 is hidden in the slot 21, it is difficult for the person who pries the meter to see the position of the ultrasonic sealing line 15, and thus it is difficult to find a suitable position to pry open the electric energy meter.

[0067] When the person who is prying the meter uses a flat-blade screwdriver or other tool to act on the front housing 1 ( Figure 2 The arrows A and B in the middle indicate the positions of the tool for prying the table. Due to the obstruction of the boss 22, the tool will first contact the boss 22 and will not easily contact the bottom wall 211 of the slot 21, thereby protecting the position where the plug-in portion 11 is fixedly connected to the bottom wall 211;

[0068] Specifically, if the prying tool is used to pry from the first connection surface 1a, Figure 2 The arrow A in the middle indicates the position of the tool prying table, and the surface 1c ( Figure 2 ) is easily damaged, especially near the thinned portion 11c;

[0069] If the prying tool is used to pry from the second connection surface 1b, Figure 2 The middle arrow B indicates the position where the tool pries the watch, and the front housing 1 is easily damaged at the plug-in portion 11 or the position where the plug-in portion 11 is connected to the extension portion 12. In this way, there are many positions that are easily damaged, and they are easy to be observed from the appearance.

[0070] After the meter is pried, it is easy to leave a prying mark, and the damaged position can be observed through the recessed portion 212a to know that the meter prying event has occurred, so it has the function of preventing the meter from being pried and electricity theft.

[0071] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0072] Embodiment 2:

[0073] The shell structure of the electric energy meter is basically the same as that of Example 1, with the difference that the end face of the first end portion 11a of the plug-in portion 11 is fixedly connected to the bottom wall 211 by means of a sealant. In addition, in order to further strengthen the fixed connection between the rear shell 2 and the front shell 1, the inner side wall of the first end portion 11a of the plug-in portion 11 and the inner extension wall 213 corresponding to the slot 21 can also be fixedly connected by means of a second connection structure, which is a sealant bonding. The outer side wall of the first end portion 11a of the plug-in portion 11 and the outer extension wall 212 corresponding to the slot 21 can also be fixedly connected by means of a third connection structure, which is a sealant bonding.

[0074] When installing in this way, first drip sealant into the slot 21 of the rear shell 2, and then insert the plug-in part 11 of the front shell 1 into the slot 21. Because the sealant has a certain volume, after the plug-in part 11 is inserted into the slot 21, the glue spreads toward the plug-in part 11, so that the bottom wall 211, the outer extension wall 212, and the inner extension wall 213 corresponding to the slot 21 are all bonded to the plug-in part 11. In this way, the area where the groove wall of the slot 21 is bonded to the plug-in part 11 is larger, and the fixing effect is better.

[0075] Embodiment 3:

[0076] The housing structure is basically the same as that of the electric energy meter of Example 1, except that: in order to further strengthen the fixed connection between the rear housing 2 and the front housing 1, the inner side wall of the first end 11a of the plug-in portion 11 and the inner extension wall 213 corresponding to the slot 21 can also be fixedly connected by a second connection structure, which is ultrasonic welding, and the outer side wall of the first end 11a of the plug-in portion 11 and the outer extension wall 212 corresponding to the slot 21 can also be fixedly connected by a third connection structure, which is ultrasonic welding. In this way, there are more fixed connection positions between the rear housing 2 and the front housing 1 and the fixed connection is more stable.

[0077] Embodiment 4:

[0078] The shell structure is basically the same as that of the electric energy meter in Example 1, except that the plug-in portion 11 and the inner extension wall 213 of the slot 21 are connected by laser welding.

[0079] The manufacturing method of the electric energy meter shell is to adopt the shell structure of the electric energy meter of Example 4, and the plug-in part 11 and the inner extension wall 213 of the slot 21 are connected by laser welding, specifically: the optical path of the laser passes through the recessed part 212a and irradiates the plug-in part 11, so that the inner side wall of the plug-in part 11 is adhered to the inner extension wall 213 of the slot 21, so that the front shell 1 and the rear shell 2 are fixedly connected. Preferably, the plug-in part 11 is made of transparent material, and the inner extension wall 213 of the slot 21 is made of non-transparent material. Because the recessed part 212a is used for the laser to pass through, the inner side wall of the plug-in part 11 and the inner extension wall 213 of the slot 21 are adhered to a larger area, which is conducive to the stable connection of the front shell 1 and the rear shell 2.

Claims

1. A housing structure of an electric energy meter, comprising A rear housing (2) having an opening (2a) on its front side; A front housing (1), a cover arranged at the opening (2a) and fixedly connected to the rear housing (2) for closing the opening (2a), one of the front housing (1) and the rear housing (2) having a plug-in portion (11), and the other of the front housing (1) and the rear housing (2) having a slot (21) pluggably matched with the plug-in portion (11); Features: The slot wall of the insertion slot (21) comprises a bottom wall (211), an outer extension wall (212) extending from the outer side of the bottom wall (211) toward the front and rear of the plug-in portion (11), the outer extension wall (212) is at least partially recessed toward the bottom wall (211) to form a recessed portion (212a), and the outer side wall of the plug-in portion (11) is at least partially exposed in the recessed portion (212a) in the front-rear direction; The plug-in portion (11) has a first end portion (11a) inserted into the slot (21), the first end portion (11a) of the plug-in portion (11) is accommodated in the slot (21), and the plug-in portion (11) is fixedly connected to a slot wall of the slot (21); The slot wall of the slot (21) further includes an inner extension wall (213) extending from the inner side of the bottom wall (211) toward the front and rear of the plug-in portion (11); The recessed portion (212a) is located in the middle of the outer extending wall (212).

2. The housing structure of the electric energy meter according to claim 1, characterized in that: The plug-in portion (11) also has a second end portion (11b) away from the slot (21), and the shell corresponding to the plug-in portion (11) also has an extension portion (12) extending from the second end portion (11b) of the plug-in portion (11) toward the inside of the shell, and the extension portion (12) is close to the inner extension wall (213) in the front-to-back direction.

3. The housing structure of the electric energy meter according to claim 2, characterized in that: The inner side wall of the shell where the plug-in portion (11) is located is recessed toward the second end portion (11b) of the plug-in portion (11) to form a thinned portion (11c).

4. The housing structure of the electric energy meter according to claim 1, characterized in that: The end surface of the first end portion (11a) of the plug-in portion (11) is fixedly connected to the bottom wall (211) via a first connection structure.

5. The housing structure of the electric energy meter according to claim 4, characterized in that: An ultrasonic sealing line (15) extending toward the bottom wall (211) is provided at the end surface of the first end portion (11a) of the plug-in portion (11), and a fixed connection between the two is achieved by ultrasonic welding; Alternatively, the end surface of the first end portion (11a) of the plug-in portion (11) is fixedly connected to the bottom wall (211) by means of a sealant.

6. The housing structure of the electric energy meter according to claim 1, characterized in that: The inner side wall of the first end portion (11a) of the plug-in portion (11) is fixedly connected to the inner extension wall (213) corresponding to the slot (21) via a second connection structure.

7. The housing structure of the electric energy meter according to claim 6, characterized in that: The second connection structure is ultrasonic welding or sealant bonding.

8. The housing structure of the electric energy meter according to claim 1, characterized in that: The outer side wall of the first end portion (11a) of the plug-in portion (11) is fixedly connected to the outer extension wall (212) corresponding to the slot (21) via a third connection structure.

9. The housing structure of the electric energy meter according to claim 8, characterized in that: The third connection structure is ultrasonic welding or sealant bonding.

10. The housing structure of the electric energy meter according to any one of claims 3 to 9, characterized in that: The housing corresponding to the slot (21) is provided with a boss (22) on the upper side or / and the lower side of the slot (21) for shielding the bottom wall (211) in the upper and lower directions. The boss (22) extends forward and backward, and the boss (22) is closer to the extension portion (12) than the bottom wall (211).

11. The housing structure of the electric energy meter according to claim 10, characterized in that: The housing corresponding to the plug-in portion (11) has a notch portion (14) adapted to the position and shape of the boss (22), and the notch portion (14) extends forward and backward.

12. The housing structure of the electric energy meter according to claim 10, characterized in that: The outer extension wall (212) also has an up-and-down extending shielding portion (212b) connected to the corresponding boss (22), the shielding portion (212b) being used to shield the outer wall of the plug-in portion (11) in the left-right direction, and the shielding portion (212b) is flush with the extension portion (12) in the left-and-right direction.

13. The housing structure of the electric energy meter according to claim 2 or 3, characterized in that: The housing corresponding to the plug-in portion (11) also has a flange (13) extending from the inner side of the extension portion (12) to the front and rear of the housing corresponding to the slot (21); When the rear housing (2) and the front housing (1) are connected, the flange (13) is located on the inner side of the inner extension wall (213) corresponding to the slot (21) and is close to the inner extension wall (213) in the left-right direction.

14. The housing structure of the electric energy meter according to any one of claims 3 to 9, characterized in that: The plug-in portion (11) is located on a side wall of a corresponding shell, an upper edge of the shell corresponding to the plug-in portion (11) has a first connection surface (1a), and a lower edge of the shell corresponding to the plug-in portion (11) has a second connection surface (1b); After the front housing (1) and the rear housing (2) are fixedly connected, the first connection surface (1a) and the second connection surface (1b) are both opposite to the housing corresponding to the slot (21) in the front-to-back direction; One of the first connecting surface (1a) and the second connecting surface (1b) is located further forward than the front surface of the extension portion (12) in the front-to-back direction. The other of the first connecting surface (1a) and the second connecting surface (1b) is located further back in the front-rear direction than the front surface of the extension portion (12).

15. An electric energy meter, characterized in that: A shell structure of an electric energy meter as claimed in any one of claims 1 to 14 is adopted.

16. A method for manufacturing a housing of an electric energy meter, manufacturing the housing structure of the electric energy meter according to any one of claims 2 to 14, characterized in that: The plug-in portion (11) and the inner extension wall (213) of the slot (21) are connected by laser welding, specifically: the light path of the laser passes through the recessed portion (212a) and irradiates the plug-in portion (11), so that the inner side wall of the plug-in portion (11) and the inner extension wall (213) of the slot are adhered to each other.

17. The method for manufacturing a housing of an electric energy meter according to claim 16, characterized in that: The plug-in portion (11) is made of transparent material, and the inner extension wall (213) of the slot (21) is made of non-transparent material.

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