A type of electricity meter

Abstract

This utility model relates to the field of electricity meters, and more particularly to an electricity meter. An electricity meter includes a meter box, a meter cover, a PCB board, and an elastic conductive element. The meter cover is closably connected to the opening of the meter box. A detection post is provided on the inner end face of the meter cover, and the bottom end of the detection post has a mounting portion. The elastic conductive element and the PCB board are disposed inside the meter box. The elastic conductive element is located on the side of the PCB board near the opening and is fixed in position relative to the PCB board. The elastic conductive element includes a conductive portion, and a mounting hole is provided on the side of the conductive portion facing away from the PCB board. When the meter cover is open, the elastic conductive element is in its initial state, and the conductive portion is separated from the PCB board. When the meter cover is closed, the mounting portion is inserted into the mounting hole and interference-fitted with the mounting hole. The detection post presses against the conductive portion, causing it to protrude towards the side near the PCB board, and the conductive portion contacts and conducts electricity with the PCB board.

Description

Technical Field

[0001] This utility model relates to the field of electricity meters, and more particularly to an electricity meter. Background Technology

[0002] An electricity meter is a device used to measure the amount of electricity used by a user. Existing electricity meters have an opening detection function, which is mainly used to detect abnormal opening behavior of the meter casing in real time, and to record, alarm or trigger protection mechanisms through technical means to prevent electricity theft, tampering of meter wiring, equipment damage, etc., so as to ensure the accuracy of electricity measurement and the safe operation of the power grid.

[0003] To achieve the on / off detection function of the electricity meter, existing meters utilize a mechanical button linked to a detection circuit. Specifically, a detection post is located inside the meter's top cover, and a PCB board with a silicone button is mounted on the PCB board. When the top cover is in place, the detection post presses against the silicone button, applying continuous pressure to keep the conductive particles at the bottom of the silicone button in contact with the carbon film on the PCB board, thus conducting the detection circuit. When the top cover is opened, the detection post moves away from the silicone button, the silicone button returns to its initial state, the conductive particles separate from the carbon film on the PCB board, and the detection circuit disconnects. The meter's main program continuously monitors the on / off state of the detection circuit, determining and recording the cover opening event based on the "on" and "off" changes in the detection circuit.

[0004] However, the silicone buttons on the aforementioned meters are prone to mechanical fatigue due to prolonged pressure. When the detection column is removed, the silicone buttons may not be able to recover their deformation, resulting in jamming and failure to spring back, which causes the meter to be unable to accurately detect open cover events. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: in existing electricity meters, the silicone buttons are prone to deformation and sticking, which prevents the electricity meter from accurately detecting the opening event. Therefore, this utility model provides an electricity meter.

[0006] To address the aforementioned problems, this utility model provides an electricity meter, including a meter box, a meter cover, a PCB board, and an elastic conductive component. The meter box has an opening, and the meter cover is detachably connected to the opening of the meter box. The inner end face of the meter cover is provided with a detection post, and the bottom end of the detection post has a mounting portion. The elastic conductive element and the PCB board are disposed inside the meter box. The elastic conductive element is located on the side of the PCB board near the opening and is fixed in position relative to the PCB board. The elastic conductive element includes a conductive part, and the conductive part has a mounting hole on the side facing away from the PCB board. When the meter cover is open, the elastic conductive element is in its initial state, and the conductive part is separated from the PCB board. When the meter cover is closed, the mounting part is embedded in the mounting hole and is interference-fitted with the mounting hole. The detection column presses the conductive part to protrude towards the side closer to the PCB board, so that the conductive part contacts and conducts electricity with the PCB board.

[0007] Optionally, the mounting hole has the same cross-sectional shape as the mounting part, the length of the mounting part is greater than the depth of the mounting hole, and the cross-sectional dimension of the mounting part is greater than the cross-sectional dimension of the mounting hole.

[0008] Optionally, the mounting hole is a circular hole, the mounting part is a cylinder, the radius of the mounting hole is r, the radius of the mounting part is R, and the difference between R and r is 0.1~0.2mm.

[0009] Optionally, the depth of the mounting hole S > 3 mm and r > 1.5 mm.

[0010] Optionally, the mounting part and the mounting hole are interference-fitted in the depth direction of the mounting hole, and the interference range between the mounting part and the mounting hole in the depth direction is 0.6~1.0mm.

[0011] Optionally, conductive particles are provided on the bottom surface of the conductive part, and a carbon film is provided on the side surface of the PCB board near the elastic conductive element. The conductive particles are located directly above the carbon film, and the conductive particles can make conductive contact with the carbon film under the pressure of the detection column.

[0012] Optionally, the elastic conductive element further includes a support portion, which is disposed around the outside of the conductive portion, one side of the support portion is connected to the bottom of the conductive portion, and the PCB board supports the support portion; When the elastic conductive element is in the initial state, the bottom surface of the conductive part is higher than the bottom surface of the supporting part.

[0013] Optionally, the meter cover includes a detection cover and a base cover assembled with the detection cover. The detection post is disposed on the inner end face of the detection cover. The base cover has a positioning structure on the side near the detection cover. The positioning structure has a through hole that extends along the opening direction of the opening. The conductive part is inserted into the through hole from the bottom end of the through hole, and the top end of the through hole exposes the mounting hole of the conductive part. The positioning structure can press the support portion onto the PCB board when the base cover is closed on the meter box, so as to fix the position of the elastic conductive element relative to the PCB board; the mounting portion can be embedded into the mounting hole when the detection cover is closed on the meter box.

[0014] Optionally, the elastic conductive element further includes a guide side edge, which is disposed around the other side of the support portion, and a positioning annular groove is formed between the inner surface of the guide side edge and the outer surface of the conductive portion. The positioning structure has a first positioning groove with an opening facing the PCB board. The first positioning groove extends along the opening direction of the opening and closing port. The positioning structure forms a first positioning edge between the first positioning groove and the through hole. The first positioning edge can be inserted into the positioning ring groove, and the guide side edge can be inserted into the first positioning groove.

[0015] Optionally, a second positioning groove is provided on the side of the base cover near the detection cover. The opening of the second positioning groove faces away from the PCB board. The second positioning groove extends along the opening direction of the opening and closing port. The base cover forms a second positioning edge on the outside of the second positioning groove. The detection cover has a third positioning groove on the side near the base cover. The opening of the third positioning groove faces the PCB board. The third positioning groove extends along the opening direction of the opening and closing port. The detection cover forms a third positioning edge on the outside of the third positioning groove. The second positioning edge can be inserted into the third positioning groove.

[0016] This utility model provides an electricity meter. When the meter cover closes the opening of the meter box, the detection column presses against the conductive part of the elastic conductive element, making the conductive part contact and conduction with the PCB board. At the same time, the mounting part of the detection column is embedded in the mounting hole with an interference fit. When the meter cover is removed, the detection column is pulled up with the meter cover. The friction and adhesion between the mounting hole and the mounting part allow the detection column to drive the conductive part to recover its deformation in a direction away from the PCB board. This facilitates the rapid rebound of the elastic conductive element to its initial state, thereby facilitating the rapid separation of the conductive part from the PCB board and avoiding jamming or failure to rebound. This improves the reliability of the meter's open-cover detection function and extends the service life of the elastic conductive element. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an electricity meter (hidden behind the meter box) provided in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the relationship between the detection column, the elastic conductive element, and the PCB board when the detection cover is removed. Figure 3 for Figure 1 A schematic diagram of the structure of the elastic conductive element in the diagram.

[0019] The reference numerals in the accompanying drawings are as follows: 1. Meter cover; 11. Detection column; 111. Mounting part; 12. Base cover; 121. Positioning structure; 122. Through hole; 123. First positioning groove; 124. First positioning edge; 125. Second positioning groove; 126. Second positioning edge; 13. Detection cover; 131. Third positioning groove; 132. Third positioning edge; 2. PCB board; 3. Elastic conductive component; 31. Conductive part; 311. Mounting hole; 32. Support part; 33. Guide side edge; 34. Positioning ring groove; 35. Conductive particles. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] One embodiment of this utility model provides an electricity meter, such as... Figure 1 and Figure 2 As shown, it includes an electric meter box, an electric meter cover 1, a PCB board 2 and an elastic conductive component 3. The electric meter box has an opening and closing port, and the electric meter cover 1 is detachably connected to the opening and closing port of the electric meter box. The inner end face of the electric meter cover 1 is provided with a detection post 11, and the bottom end of the detection post 11 has a mounting part 111.

[0022] The elastic conductive element 3 and the PCB board 2 are disposed inside the meter box. The elastic conductive element 3 is located on the side of the PCB board 2 near the opening and is fixed relative to the PCB board 2. The elastic conductive element 3 includes a conductive part 31, and the conductive part 31 has a mounting hole 311 on the side facing away from the PCB board 2.

[0023] It should be noted that the elastic conductive element 3 has elastic and conductive properties. The statement that "the position of the elastic conductive element 3 relative to the PCB board 2 is fixed" means that the overall position of the elastic conductive element 3 relative to the PCB board 2 remains unchanged. However, the elastic conductive element 3 itself can undergo elastic deformation according to its elastic properties.

[0024] like Figure 2 As shown, with the meter cover 1 open, the elastic conductive element 3 is in its initial state, and the conductive part 31 is separated from the PCB board 2. Figure 1As shown, with the meter cover 1 closed, the mounting part 111 is inserted into the mounting hole 311 and is press-fitted with the mounting hole 311. The detection column 11 presses the conductive part 31 to protrude towards the side closer to the PCB board 2, so that the conductive part 31 contacts the PCB board 2 and conducts electricity.

[0025] Specifically, when the meter cover 1 is closed on the opening of the meter box, the mounting part 111 is embedded in the mounting hole 311 of the conductive part 31 of the elastic conductive member 3, the detection post 11 presses the conductive part 31 downward, and the conductive part 31 protrudes downward to deform so as to contact and conduct with the PCB board 2, so that the detection circuit integrated on the PCB board 2 is turned on.

[0026] When the mounting part 111, which is interference-fitted with the mounting hole 311, is inserted into the mounting hole 311, it causes slight elastic deformation of the elastic conductive element 3, forming a local vacuum adsorption effect, which significantly increases the friction and adhesion between the mounting part 111 and the elastic conductive element 3. When the meter cover 1 is subjected to external pressure, the detection column 11 can slightly compress the elastic conductive element 3 within the mounting hole 311 to maintain stable contact between the elastic conductive element 3 and the PCB board 2, thereby ensuring the stability of the cover opening detection function.

[0027] When the meter cover 1 is removed and the opening is opened, the detection post 11 on the meter cover 1 is pulled up along with the meter cover 1, relieving the pressure on the elastic conductive part 3. The mounting part 111, which is interference-fitted with the mounting hole 311, will drive the conductive part 31 to deform away from the PCB board 2, which is conducive to the elastic conductive part 3 quickly rebounding to the initial state, so that the conductive part 31 is quickly separated from the PCB board 2. As a result, the detection circuit integrated on the PCB board 2 is disconnected. This disconnection signal can be captured by the hardware circuit of the meter and interpreted as a cover opening event, thereby realizing the detection of the removal state of the meter cover 1 and data reporting.

[0028] In this utility model, when the meter cover 1 closes the opening of the meter box, the detection column 11 presses against the conductive part 31 of the elastic conductive element 3, making the conductive part 31 contact and conduct with the PCB board 2. At the same time, the mounting part 111 of the detection column 11 is embedded in the mounting hole 311, and the mounting part 111 and the mounting hole 311 are interference-fitted. When the meter cover 1 is removed, the detection column 11 is pulled up with the meter cover 1. The friction and adhesion between the mounting hole 311 and the mounting part 111 can make the detection column 11 drive the conductive part 31 to recover its deformation in the direction away from the PCB board 2. This is conducive to the elastic conductive element 3 quickly rebounding to its initial state, and thus facilitates the rapid separation of the conductive part 31 from the PCB board 2, avoiding jamming or failure to rebound, improving the reliability of the meter's opening detection function, and extending the service life of the elastic conductive element 3.

[0029] Furthermore, when the meter cover 1 is removed, the mounting part 111, which is in interference fit with the mounting hole 311, will make a "click" sound when it is pulled out of the mounting hole 311, which can provide a clear operation indication, facilitate quick judgment of the status of the elastic conductive part 3, and optimize operation feedback.

[0030] In one embodiment, the mounting hole 311 and the mounting portion 111 have the same cross-sectional shape, the length of the mounting portion 111 is greater than the depth of the mounting hole 311, and the cross-sectional dimension of the mounting portion 111 is greater than the cross-sectional dimension of the mounting hole 311.

[0031] When the meter cover 1 is closed at the opening, the mounting part 111 is squeezed into the entire mounting hole 311. The entire mounting hole 311 and the mounting part 111 are in an interference fit to increase the area of ​​the interference fit between the mounting part 111 and the mounting hole 311, thereby increasing the friction between the mounting part 111 and the elastic conductive element 3. This makes it easier for the detection column 11 to drive the elastic conductive element 3 to spring back to the initial state when the meter cover 1 is removed.

[0032] In one embodiment, such as Figure 2 As shown, the mounting hole 311 is a circular hole, the mounting part 111 is a cylinder, the radius of the mounting hole 311 is r, the radius of the mounting part 111 is R, and the difference between R and r is 0.1~0.2mm.

[0033] If the difference in Rr is too small (<0.1mm), the elastic deformation of the conductive part 31 will be small when the mounting part 111 is squeezed into the mounting hole 311, resulting in a weak local vacuum adsorption effect. The friction between the mounting part 111 and the elastic conductive part 3 will be small, which may cause the detection column 11 to be unable to drive the elastic conductive part 3 to rebound to the initial state when the meter cover 1 is removed.

[0034] If the difference in Rr is too large (>0.2mm), the elastic conductive element 3 may be excessively deformed when the mounting part 111 is squeezed into the mounting hole 311, causing some areas of the hole wall of the mounting hole 311 to lose elasticity and become unable to recover. When the mounting part 111 of the detection column 11 is pulled out of the mounting hole 311, the resistance encountered by the detection column 11 when it is pulled out varies greatly, reducing the operating feel.

[0035] Therefore, the difference in Rr is limited to 0.1~0.2mm.

[0036] In one embodiment, such as Figure 2 As shown, the depth S of mounting hole 311 is greater than 3 mm, and r is greater than 1.5 mm.

[0037] The depth and radius of the mounting hole 311 both affect the area of ​​the interference fit between the mounting part 111 and the mounting hole 311. If the size of the mounting hole 311 is too small, the area of ​​the interference fit between the mounting part 111 and the mounting hole 311 is limited, resulting in limited friction between the mounting part 111 and the elastic conductive element 3. When the mounting hole 311 is pulled out, the detection post 11 may not be able to effectively drive the elastic conductive element 3 to recover its deformation. Therefore, the depth S of the mounting hole 311 is limited to 3mm and r to 1.5mm. The upper limit of the depth S and the upper limit of r of the mounting hole 311 are determined according to the size of the elastic conductive element 3. The size of the elastic conductive element 3 depends on the space inside the meter, and it is necessary to avoid the elastic conductive element 3 interfering with other structures inside the meter.

[0038] In one embodiment, such as Figure 1 As shown, the mounting part 111 and the mounting hole 311 are interference-fitted in the depth direction of the mounting hole 311, and the interference range between the mounting part 111 and the mounting hole 311 in the depth direction is 0.6~1.0mm.

[0039] When the meter cover 1 closes or closes, the mounting part 111 is squeezed into the mounting hole 311. The detection column 11 causes the conductive part 31 to protrude downward, so that the conductive part 31 first abuts against the PCB board 2. The mounting part 111 of the detection column 11, which continues to move downward, presses against the bottom wall of the mounting hole 311, causing the conductive part 31 to generate a stable radial preload on the mounting part 111. This preload is converted into a frictional force sufficient to resist vibration, impact or slight external force, firmly anchoring the mounting part 111 in the mounting hole 311. This prevents the detection column 11 from moving axially or loosening, thereby improving the reliability of the meter during transportation and vibration testing.

[0040] If the interference fit between the mounting part 111 and the mounting hole 311 in the depth direction is too small (<0.6mm), the radial preload of the conductive part 31 on the mounting part 111 will be small, which is not conducive to firmly anchoring the mounting part 111 in the mounting hole 311; if the interference fit between the mounting part 111 and the mounting hole 311 in the depth direction is too large (>1.0mm), the deformation of the conductive part 31 will be too large, which may lead to elastic failure.

[0041] Therefore, the interference range between the mounting part 111 and the mounting hole 311 in the depth direction is limited to 0.6~1.0mm.

[0042] In one embodiment, the depth S of the mounting hole 311 is 4.0 mm, r is 1.3 mm, R is 1.5 mm, and the interference fit between the mounting part 111 and the mounting hole 311 in the depth direction is 0.7 mm. Of course, in actual use, the design dimensions of the mounting hole 311 and the mounting part 111 can be adjusted according to the actual shape and size of the meter.

[0043] In one embodiment, such as Figure 1 and Figure 3 As shown, conductive particles 35 are provided on the bottom surface of the conductive part 31, and a carbon film is provided on the side surface of the PCB board 2 near the elastic conductive member 3. The conductive particles 35 are located directly above the carbon film, and the conductive particles 35 can make conductive contact with the carbon film under the pressure of the detection column 11.

[0044] In one embodiment, the elastic conductive element 3 is a silicone element, and conductive particles 35 are filled at the bottom of the silicone element.

[0045] In other embodiments, the material of the elastic conductive element 3 can be a thermoplastic elastomer (TPE). The conductive part 31 of the thermoplastic elastomer material is mixed with the conductive particles 35 so that the conductive part 31 can make conductive contact with the PCB board 2. The conductive particles 35 can be conductive carbon particles, conductive metal particles, graphite powder, etc.

[0046] In one embodiment, such as Figure 2 and Figure 3 As shown, the elastic conductive element 3 also includes a support portion 32, which is arranged around the outside of the conductive part 31. One side of the support portion 32 is connected to the bottom of the conductive part 31, and the PCB board 2 supports the support portion 32.

[0047] When the elastic conductive member 3 is in its initial state, the bottom surface of the conductive part 31 is higher than the bottom surface of the support part 32, so that the conductive part 31 is separated from the PCB board 2.

[0048] While the conductive part 31 of the elastic conductive element 3 is separated from the PCB in the initial state, the elastic conductive element 3 can be placed on the PCB board 2 by the support part 32 without the need for other structures to stabilize the elastic conductive element 3, which facilitates the assembly between the PCB board 2 and the elastic conductive element 3.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, the meter cover 1 includes a detection cover 13 and a base cover 12 assembled with the detection cover 13. The detection post 11 is disposed on the inner end face of the detection cover 13. The base cover 12 is provided with a positioning structure 121 on the side near the detection cover 13. The positioning structure 121 is provided with a through hole 122 extending along the opening direction of the opening. The conductive part 31 is inserted into the through hole 122 from the bottom end of the through hole 122. The top end of the through hole 122 exposes the mounting hole 311 of the conductive part 31.

[0050] The positioning structure 121 can press the support part 32 onto the PCB board 2 when the base cover 12 is closed on the meter box, so as to fix the position of the elastic conductive element 3 relative to the PCB board 2. The mounting part 111 can be inserted into the mounting hole 311 when the detection cover 13 is closed on the meter box.

[0051] When assembling the meter, the base cover 12, the elastic conductive element 3 and the PCB board 2 can be assembled together first, so that the base cover 12 restricts the position of the elastic conductive element 3 relative to the PCB board 2 and fixes it, and then the detection cover 13 is assembled.

[0052] During the process of embedding the mounting part 111 of the detection column 11 into the mounting hole 311 of the elastic conductive element 3, the base cover 12 can restrict the movement of the elastic conductive element 3, so as to facilitate the alignment of the mounting part 111 into the mounting hole 311 of the elastic conductive element 3, which is conducive to rapid assembly and improves assembly efficiency.

[0053] In one embodiment, such as Figures 1 to 3 As shown, the elastic conductive element 3 also includes a guide side edge 33, which is disposed around the other side of the support portion 32, and a positioning annular groove 34 is formed between the inner surface of the guide side edge 33 and the outer surface of the conductive portion 31.

[0054] The positioning structure 121 is provided with a first positioning groove 123 with an opening facing the PCB board 2. The first positioning groove 123 extends along the opening direction of the opening and closing. The positioning structure 121 forms a first positioning edge 124 between the first positioning groove 123 and the through hole 122. The first positioning edge 124 can be inserted into the positioning ring groove 34, and the guide side edge 33 can be inserted into the first positioning groove 123.

[0055] When the positioning structure 121 of the base cover 12 is assembled with the elastic conductive element 3, the guide side edge 33 of the elastic conductive element 3 is inserted into the first positioning groove 123, and the first positioning edge 124 of the positioning structure 121 is inserted into the positioning ring groove 34, so that the elastic conductive element 3 and the positioning structure 121 are inserted along the opening direction of the opening and closing, so as to avoid the elastic conductive element 3 tilting and causing the detection column 11 to fail to be aligned and embedded in the mounting hole 311, which is conducive to the rapid assembly of the meter and improves the assembly consistency.

[0056] In one embodiment, such as Figure 1 and Figure 2 As shown, a second positioning groove 125 is provided on the side of the base cover 12 near the detection cover 13. The opening of the second positioning groove 125 faces away from the PCB board 2. The second positioning groove 125 extends along the opening direction of the opening and closing port. The base cover 12 forms a second positioning edge 126 on the outside of the second positioning groove 125.

[0057] The detection cover 13 has a third positioning groove 131 on the side near the base cover 12. The opening of the third positioning groove 131 faces the PCB board 2. The third positioning groove 131 extends along the opening direction of the opening and closing port. The detection cover 13 forms a third positioning edge 132 on the outside of the third positioning groove 131. The second positioning edge 126 can be inserted into the third positioning groove 131, and the third positioning edge 132 can be inserted into the second positioning groove 125.

[0058] After the base cover 12, the elastic conductive element 3 and the PCB board 2 are assembled together, when assembling the detection cover 13, the second positioning edge 126 is inserted into the third positioning groove 131, and the third positioning edge 132 is inserted into the second positioning groove 125, so that the detection cover 13 is closed along the opening direction of the opening and closing port, so that the mounting part 111 of the detection column 11 can be aligned and embedded in the mounting hole 311, which is conducive to the rapid assembly of the meter and improves the assembly consistency.

[0059] In other embodiments, the cross-sectional shapes of the mounting hole 311 and the mounting portion 111 may be different. For example, the cross-sectional shape of the mounting hole 311 may be an elliptical hole, and the cross-sectional shape of the mounting portion 111 may be a circular hole, or the mounting hole 311 may be a cylindrical hole, and the mounting portion 111 may be spherical.

[0060] In other embodiments, the cross-sectional shape of the mounting hole 311 and the mounting part 111 can both be square, hexagonal or other irregular shapes. In this case, the interference between the hole wall of the mounting hole 311 and the corresponding side of the mounting part 111 can be 0.1~0.2mm.

[0061] In other embodiments, multiple legs may be provided on the outer periphery of the conductive part 31, and the multiple legs can jointly support the conductive part 31, so that the conductive part 31 is suspended in the initial state.

[0062] In other embodiments, the mounting portion 111 may be a protruding ring surrounding the outer periphery of the detection post 11, and the cross-sectional dimension of the protruding ring is larger than the cross-sectional dimension of the mounting hole 311.

[0063] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. An electricity meter, characterized in that, The device includes a meter box, a meter cover, a PCB board, and an elastic conductive component. The meter box has an opening and closing port, and the meter cover is detachably connected to the opening and closing port of the meter box. The inner end face of the meter cover is provided with a detection post, and the bottom end of the detection post has a mounting part. The elastic conductive element and the PCB board are disposed inside the meter box. The elastic conductive element is located on the side of the PCB board near the opening and is fixed in position relative to the PCB board. The elastic conductive element includes a conductive part, and the conductive part has a mounting hole on the side facing away from the PCB board. When the meter cover is open, the elastic conductive element is in its initial state, and the conductive part is separated from the PCB board. When the meter cover is closed, the mounting part is embedded in the mounting hole and is interference-fitted with the mounting hole. The detection column presses the conductive part to protrude towards the side closer to the PCB board, so that the conductive part contacts and conducts electricity with the PCB board.

2. The electricity meter according to claim 1, characterized in that, The mounting hole has the same cross-sectional shape as the mounting part, the length of the mounting part is greater than the depth of the mounting hole, and the cross-sectional dimension of the mounting part is greater than the cross-sectional dimension of the mounting hole.

3. The electricity meter according to claim 2, characterized in that, The mounting hole is a circular hole, the mounting part is a cylinder, the radius of the mounting hole is r, the radius of the mounting part is R, and the difference between R and r is 0.1~0.2mm.

4. The electricity meter according to claim 3, characterized in that, The depth of the mounting hole is S > 3 mm, and r > 1.5 mm.

5. The electricity meter according to claim 1, characterized in that, The mounting part and the mounting hole are interference-fitted in the depth direction of the mounting hole, and the interference range between the mounting part and the mounting hole in the depth direction is 0.6~1.0mm.

6. The electricity meter according to claim 1, characterized in that, The bottom surface of the conductive part is provided with conductive particles, and a carbon film is provided on the side surface of the PCB board near the elastic conductive element. The conductive particles are located directly above the carbon film, and the conductive particles can make conductive contact with the carbon film under the pressure of the detection column.

7. The electricity meter according to claim 1, characterized in that, The elastic conductive element further includes a support portion, which is arranged around the outside of the conductive portion. One side of the support portion is connected to the bottom of the conductive portion, and the PCB board supports the support portion. When the elastic conductive element is in the initial state, the bottom surface of the conductive part is higher than the bottom surface of the supporting part.

8. The electricity meter according to claim 7, characterized in that, The meter cover includes a detection cover and a base cover assembled with the detection cover. The detection post is disposed on the inner end face of the detection cover. The base cover has a positioning structure on the side near the detection cover. The positioning structure has a through hole that extends through the opening direction of the opening and closing port. The conductive part is inserted into the through hole from the bottom end of the through hole, and the top end of the through hole exposes the mounting hole of the conductive part. The positioning structure can press the support portion onto the PCB board when the base cover is closed on the meter box, so as to fix the position of the elastic conductive element relative to the PCB board; the mounting portion can be embedded into the mounting hole when the detection cover is closed on the meter box.

9. The electricity meter according to claim 8, characterized in that, The elastic conductive element also includes a guide side edge, which is disposed around the other side of the support portion, and a positioning annular groove is formed between the inner surface of the guide side edge and the outer surface of the conductive portion. The positioning structure has a first positioning groove with an opening facing the PCB board. The first positioning groove extends along the opening direction of the opening and closing port. The positioning structure forms a first positioning edge between the first positioning groove and the through hole. The first positioning edge can be inserted into the positioning ring groove, and the guide side edge can be inserted into the first positioning groove.

10. The electricity meter according to claim 8, characterized in that, The base cover has a second positioning groove on the side near the detection cover. The opening of the second positioning groove faces away from the PCB board. The second positioning groove extends along the opening direction of the opening and closing port. The base cover forms a second positioning edge on the outside of the second positioning groove. The detection cover has a third positioning groove on the side near the base cover. The opening of the third positioning groove faces the PCB board. The third positioning groove extends along the opening direction of the opening and closing port. The detection cover forms a third positioning edge on the outside of the third positioning groove. The second positioning edge can be inserted into the third positioning groove.

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