An ammeter ultrasonic welding structure

Abstract

The utility model discloses an ammeter ultrasonic welding structure relates to ammeter manufacturing technical field, including the welding rib of being located on the apron, and the welding rib inserts the welding recess on the shell inside, the inside edge of welding rib and first welding surface meet, and the outside edge and second welding surface meet, and second welding surface is higher than first welding surface, the welding recess section is the rectangle that is provided with the chamfer of bottom end symmetry, and the inside edge meets and has first overflow material surface, is equipped with a plurality of longitudinal grooves on first overflow material surface, and the outside edge meets and has second overflow material surface, and overflow material space is formed between second overflow material surface and second welding surface. The utility model can prevent the virtual welding not firm, guarantees the firmness of welding and the sealing property and protects crystal vibration precision.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter manufacturing technology, specifically to an ultrasonic welding structure for electricity meters. Background Technology

[0002] In electricity meter manufacturing, ultrasonic welding is commonly used to connect the casing (such as the upper and lower casings). This technology utilizes high-frequency vibration to melt and solidify the contact surfaces, achieving a rapid, sealed connection. However, existing welding structures are mostly "linear contact" designs (such as a single raised welding line). During welding, uneven contact pressure and unbalanced vibration energy distribution can easily lead to localized incomplete fusion (false welds), severely affecting connection strength and sealing performance. To address these false welds, current technologies often strengthen the connection by increasing ultrasonic power (over 2000W) or extending welding time (over 1.5 seconds). However, the meter's internal crystal oscillator is sensitive to high-frequency vibration and heat; excessive welding can cause crystal oscillator parameter drift (frequency deviation exceeding ±5ppm), ultimately resulting in excessive metering error (exceeding ±1%).

[0003] Chinese Patent Publication No. CN209454181U, Publication Date: October 1, 2019, discloses an ultrasonic welding structure for a lens hook on an electric meter housing. The structure includes a lens portion and a hook portion. The lens portion includes a concave outer edge, with an ultrasonic line positioned at the midline of the concave outer edge. The hook portion includes a convex mating edge with the same shape and size as the concave outer edge of the lens portion. The concave outer edge and the convex mating edge together serve as two ultrasonic welding connecting edges for the lens hook on the electric meter housing. A protruding edge is provided on the outer side of the convex mating edge, with its surface lower than the upper surface of the convex mating edge. A boss is provided on the protruding edge at the concave position corresponding to the concave outer edge. This welding structure is still a linear contact welding method using ultrasonic welding connecting edges, which is prone to causing incomplete welds and affecting the connection strength. Utility Model Content

[0004] This utility model provides an ultrasonic welding structure for electricity meters. By setting welding ribs and welding grooves, it prevents weak or incomplete welding, ensures the strength and sealing of the welding, and protects the accuracy of the crystal oscillator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an ultrasonic welding structure for an electric meter, comprising welding ribs provided on a cover plate, the welding ribs being inserted into welding grooves on the housing; the inner side of the welding ribs is connected to a first welding surface, the outer side is connected to a second welding surface, the second welding surface being higher than the first welding surface; the cross-section of the welding groove is a rectangle with symmetrical chamfers at the bottom, the inner side is connected to a first overflow surface, the first overflow surface is provided with a plurality of longitudinal grooves, the outer side is connected to a second overflow surface, and an overflow space is formed between the second overflow surface and the second welding surface.

[0006] Preferably, the welding ribs are located at the lower end of the cover plate, and the welding grooves are located on the same side of the upper surface of the shell. This invention uses a "shear-type welding structure" instead of a traditional linear welding structure, with the welding ribs continuously distributed along the edge of the component. During welding, the molten material can be distributed more evenly, significantly increasing the welding area and thus significantly improving welding strength and reliability.

[0007] Preferably, the weld bead has a right-angled trapezoidal cross-section, with the right-angled side at the bottom and the lower base at the outer edge. This facilitates the application of vertical pressure during welding, resulting in a tighter bond between the weld bead and the weld groove, further enhancing the weld's sealing performance.

[0008] Preferably, the angle α between the bottom surface of the welded rib and the first weld surface is 91° to 95°, and the length l of the top bottom surface is 2.5 to 3 mm. α is preferably 91°, and the draft angle is 1°. This facilitates smooth demolding of the welded rib and avoids damage or deformation caused by difficulties in demolding.

[0009] Preferably, the bottom two sides of the welding rib are S-side and R-side respectively, the width d of the right angle side of the welding rib section is 1.5 to 2 mm, and the lower surface of the cover plate is provided with a fixing protrusion inside the welding rib. The fixing protrusion is locked inside the welding groove, that is, inside the shell.

[0010] Preferably, the bottom surface of the welding groove is surface D, and the two sides of surface D are respectively connected to inclined surfaces E and F. This gives the welding groove good force guidance and space to accommodate molten material.

[0011] Preferably, the included angle β between surface E and surface F is 20° to 40°, surface E is connected to a vertically arranged surface G by its top edge, and surface F is connected to a vertically arranged surface H by its top edge. The included angle β between surface E and surface F is preferably 30°. The surface roughness Ra of surfaces D, E, F, G, and H is ≤ 1.6 μm.

[0012] Preferably, the top edge of surface G is connected to a first overflow surface, and the top edge of surface H is connected to a second overflow surface. The first welding surface is in contact with the first overflow surface, and a longitudinal overflow space is formed between the first welding surface and several longitudinal grooves. Several longitudinal grooves are evenly distributed across the entire surface of the first overflow surface, with longitudinal grooves provided on both the inner and outer edges of the first overflow surface. The horizontal distance f between surface G and surface H is 1.8–2.3 mm. The longitudinal grooves further enhance the sealing performance of the weld.

[0013] Preferably, the depth t of the welding groove is 2.7–3.2 mm, and the vertical height h of surfaces E and F is 1.5–2 mm. Side S abuts against surface E, and side R abuts against surface F. The depth of the welding groove is adjusted according to the actual amount of welding overflow.

[0014] Preferably, the gap k between the side of the weld bead and the G and H surfaces is 0.15–0.2 mm, and the depth of the welding groove is q 0.1–0.2 mm less than the length of the top surface of the weld bead. The depth of the welding groove is preferably 0.2 mm less than the length of the top surface of the weld bead, as this area serves as overflow space. Align the cover plate with the housing, insert the weld bead into the welding groove, and ensure that the S and R angles of the ultrasonic weld bead initially contact the E and F surfaces, achieving good initial contact. Welding Operation: Using a 20kHz ultrasonic welding machine, apply a vertical pressure of 60N while simultaneously performing ultrasonic vibration at a frequency of 15kHz; control the welding power at 1200W and the welding time at 0.5 seconds. The S and R angles of the weld rib melt under the action of vertical pressure and horizontal shear force. The molten material fills the groove and completely combines with surfaces D, E, F, G, and H, forming a five-dimensional fused sealed structure. After welding, the overflow fills the overflow grooves on surfaces D, G, and F, ensuring that the entire welded groove is completely melted and the overflow fills the corresponding overflow grooves, forming an integral connection. Testing: Post-weld tensile testing shows a connection strength ≥500N (traditional structures are 200-300N), crystal oscillator frequency deviation ≤±1.5ppm, and waterproof testing passes the IP65 standard (up to IP67 after optimization).

[0015] Beneficial effects: The shear-type structure of this utility model allows the welding rib to contact the five surfaces of the groove simultaneously. During welding, the molten material spreads along the five surfaces, increasing the welding area by 200%-300% compared to the traditional linear structure, and completely avoiding local incomplete fusion. Crystal oscillator protection: The increased welding area and more uniform energy distribution enable a firm weld at lower power (≤1200W) and in a shorter time (≤0.5 seconds), significantly reducing the vibration and thermal shock to the crystal oscillator and controlling the frequency deviation within ±2ppm, thus ensuring the meter's accuracy. Excellent processability: The welded rib structure is simple, and the mold processing does not require complex curved surfaces, which simplifies the processing flow, extends the mold life, and reduces costs by about 5%. High assembly tolerance: The weld ribs and groove structure are compatible with minor deformations of the parts (such as warping ≤0.5mm), avoiding welding failure due to assembly misalignment. Improved sealing performance: The five-dimensional fusion structure forms a continuous annular seal, and the waterproof rating of the weld reaches IP67, which is better than the IP54 of traditional linear welding. Improved air discharge performance: The ring-shaped continuous seal without any poor soldering can shorten the product's creepage distance and provide more space for meter design. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the electricity meter according to the present invention.

[0017] Figure 2 for Figure 1 Cross-sectional view.

[0018] Figure 3 for Figure 2 Enlarged view of point A.

[0019] Figure 4 This is a schematic diagram of the structure of the welded bar of this utility model.

[0020] Figure 5 This is a schematic diagram of the welding groove of this utility model.

[0021] Reference numerals: 1: Welding rib; 2: Welding groove; 3: Longitudinal groove; 4: Overflow space; 5: Melting space; 6: Longitudinal overflow space; 7: Cover plate; 8: Housing; 9: Fixing protrusion; 10: Connection port. Detailed Implementation

[0022] This utility model discloses an ultrasonic welding structure for an electric meter. Its core design concept is to solve the problems that are prone to occur in the traditional electric meter welding process, such as false welding, weak welding, insufficient sealing, and the impact of the welding process on the crystal oscillator accuracy, by optimizing the structural cooperation between the welding rib 1 and the welding groove 2. Ultimately, it achieves dual protection of welding firmness and sealing, while maximizing the protection of the working accuracy of the internal crystal oscillator of the electric meter.

[0023] like Figure 1 and Figure 2 As shown, the ultrasonic welding structure of this utility model is respectively set on the cover plate 7 and the housing 8. The housing 8 is provided with several wiring ports 10. The core fit relationship of the welding structure is reflected in the welding ribs 1 set on the cover plate 7 and the corresponding welding grooves 2 set on the housing 8. The ultrasonic welding operation is completed by precisely inserting the welding ribs 1 into the welding grooves 2, forming a stable and reliable connection structure. The design of the entire welding structure revolves around the core principle of "shear welding", replacing the traditional linear welding structure and improving the welding quality and stability from the structural design level.

[0024] like Figure 2 and Figure 3As shown, regarding the placement of the welding rib 1 and the welding groove 2, to ensure accurate alignment and ease of operation during welding, the welding rib 1 is specifically positioned at the lower end of the cover plate 7, while the welding groove 2 is correspondingly positioned at the same side of the upper surface of the housing 8. This corresponding placement at the same side allows the cover plate 7 and housing 8 to be quickly positioned during assembly, and the welding rib 1 can be naturally and accurately embedded into the welding groove 2, avoiding welding defects caused by alignment deviations. Simultaneously, the welding rib 1 is continuously distributed along the edge of the cover plate 7, allowing the molten material generated during ultrasonic welding to form a continuous sealing layer on the welding surface. This not only significantly increases the actual welding area but also allows the molten material to be more evenly distributed throughout the welding area, thereby significantly improving welding strength and connection reliability.

[0025] like Figure 3 and Figure 4 As shown, the cross-sectional shape of welding rib 1 has been specially optimized and adopts a right-angled trapezoidal structure, with the right-angled side located at the bottom end of welding rib 1 and the lower base side located on the outer side of welding rib 1. This right-angled trapezoidal cross-sectional design has clear technical advantages. During ultrasonic welding, the vertical pressure can be applied more directly to the contact surface between welding rib 1 and welding groove 2, avoiding the problem of loose welding caused by pressure dispersion. The design with the right-angled side at the bottom end allows the bottom end of welding rib 1 to form a stable contact with the bottom and side surfaces of welding groove 2 after it is inserted into welding groove 2, making the combination of welding rib 1 and welding groove 2 tighter. This effectively prevents external dust, moisture, and other impurities from entering the meter, further enhancing the overall sealing performance after welding and providing a good protective environment for the stable operation of the electronic components inside the meter.

[0026] like Figure 3 and Figure 4 As shown, the connection relationship of each side of the welding rib 1 is also carefully designed. The inner side of the welding rib 1 is connected to the first welding surface, and the outer side is connected to the second welding surface, and the height of the second welding surface is higher than that of the first welding surface. This height difference design is not arbitrary, but is to leave overflow space 4 for the molten material. The first overflow surface and the second overflow surface are at the same horizontal level. When the first welding surface and the first overflow surface are in contact with each other, a gap, namely the overflow space 4, is formed between the second welding surface and the second overflow surface, which enhances the strength of the weld.

[0027] like Figure 3 and Figure 4As shown, the upper bottom surface of the welding rib 1 forms an angle α with the first welding surface. The value of this angle ranges from 91° to 95°, with 91° being preferred, corresponding to a draft angle of 1°. Simultaneously, the length of the bottom surface on the cross-section of the welding rib 1 is 2.5–3 mm. This angle design is primarily to meet the actual production requirements of mold demolding. Combined with the specially designed 1° draft angle, it ensures that the welding rib 1 can smoothly detach from the mold after injection molding, avoiding production defects such as damage, deformation, or material shortage caused by demolding difficulties. This guarantees the dimensional accuracy and structural integrity of the welding rib 1, providing assurance for subsequent welding quality. The bottom two sides of the weld rib 1 are S side and R side, respectively. During welding, the right-angled S and R sides contact the E and F surfaces of the welding groove 2, which can achieve rapid melting and welding of the S and R sides of the weld rib 1 with very small pressure and power. The width of the right-angled side of the weld rib 1 cross section is 1.5 to 2 mm. This width design ensures the structural strength of the weld rib 1 while avoiding problems such as excessive consumption of molten material and increased welding pressure requirements due to excessive width, thus achieving a balance between structural strength and welding efficiency.

[0028] like Figure 3 As shown, a fixing protrusion 9 is provided on the lower surface of the cover plate 7 inside the welding rib 1. The fixing protrusion 9 is located inside the welding groove 2. When the welding rib 1 is inserted into the welding groove 2, the fixing protrusion 9 will be simultaneously engaged inside the welding groove 2 (i.e., inside the housing 8). The fixing protrusion 9 serves a dual purpose: before welding, it can pre-fix the cover plate 7 and the housing 8, forming a preliminary positioning constraint to prevent the components from shifting due to ultrasonic vibration or pressure during welding, ensuring accurate welding alignment; after welding, it works synergistically with the welded structure to further enhance the connection strength between the cover plate 7 and the housing 8, preventing the connection from loosening due to external forces such as vibration and collision during long-term use of the meter, and extending the service life of the meter.

[0029] like Figure 3 and Figure 5As shown, the welding groove 2, used in conjunction with the welding rib 1, has a rectangular cross-section with symmetrical chamfered bottom. This design allows for good compatibility with the right-angled trapezoidal cross-section of the welding rib 1, resulting in a larger contact area and tighter fit, providing a stable foundation for heat transfer and pressure conduction during welding. The inner side of the welding groove 2 is connected to a first overflow surface, on which several longitudinal grooves 3 are specifically provided. The main function of these longitudinal grooves 3 is to accommodate partially molten overflow generated during welding, enhancing welding strength. Simultaneously, the longitudinal grooves 3 increase the contact area between the overflow and the overflow surface, allowing the overflow to adhere more stably to the first overflow surface, preventing it from falling into the meter and interfering with the normal operation of internal electronic components (especially the crystal oscillator). The outer edge of the welding groove 2 is connected to a second overflow surface, and a special overflow space 4 is formed between the second overflow surface and the second welding surface. This overflow space 4 serves as the main overflow receiving area, which can collect excess molten material during the welding process and prevent the molten material from overflowing and contaminating the surface of the meter or sticking to external components. At the same time, the design of the overflow space 4 also provides sufficient space for the molten material to cool and solidify. The solidified overflow can form an additional sealing and protective layer on the outside of the welded structure, further enhancing the sealing and robustness of the welded structure.

[0030] like Figure 3 and Figure 5 As shown, the bottom surface of the welding groove 2 is surface D, and the two sides of surface D are respectively connected to inclined surfaces E and F. The design of these two inclined surfaces has clear technical significance: on the one hand, the inclined structure can form good force guidance. When the vertical pressure during ultrasonic welding is applied to the welding structure, surfaces E and F can evenly transmit the pressure to all parts of the welding surface, avoiding local over-welding or under-welding caused by pressure concentration, and ensuring the consistency of welding quality throughout the welding area; on the other hand, the design of the inclined surfaces increases the internal capacity of the welding groove 2, which can better accommodate the molten material, allowing the molten material to be evenly distributed in the welding groove 2, fully filling the gap between the welding rib 1 and the welding groove 2, further improving the strength and sealing of the weld.

[0031] like Figure 3As shown, in the internal structure optimization of the welding groove 2, surfaces E and F are key contact surfaces that are inclined on both sides of surface D. The included angle β is limited to between 20° and 40°, with a preferred value of 30°. This included angle design is precisely considered to ensure that when the welding rib 1 is inserted into the welding groove 2, the bottom S and R sides can smoothly and tightly abut against surfaces E and F, forming a good initial contact state. It also provides a reasonable guiding angle for the flow of molten material, so that the molten material can evenly cover the entire contact area of ​​surfaces E and F under pressure, avoiding local material accumulation or incomplete coverage. The top edge of surface E is connected to a vertically arranged surface G, and the top edge of surface F is connected to a vertically arranged surface H. The vertical design of surfaces G and H provides a precise positioning reference for the side of the welding rib 1, ensuring the positional stability of the welding rib 1 in the horizontal direction after insertion and avoiding uneven welding surface adhesion due to lateral offset. Meanwhile, the surface roughness of surfaces D, E, F, G, and H is controlled within the range of Ra≤1.6μm. This low roughness design can reduce the frictional resistance between the welding rib 1 and each contact surface, facilitating precise alignment during assembly. More importantly, the smooth surface allows the molten material to better wet and adhere, ensuring that the molten material forms a tight fusion effect with each contact surface, avoiding fusion gaps caused by surface roughness, and further improving the sealing and firmness of the weld.

[0032] like Figure 5 As shown, the top edge of surface G connects to the first overflow surface, and the top edge of surface H connects to the second overflow surface. This connection allows the first welding surface to directly contact the first overflow surface, forming a continuous transition structure and providing a smooth channel for the flow of molten material. A longitudinal overflow space 6 is formed between several longitudinal grooves 3 on the first welding surface and the first overflow surface. These longitudinal grooves 3 are not locally distributed but evenly distributed across the entire first overflow surface, with longitudinal grooves 3 on both the inner and outer edges of the first overflow surface to facilitate the overflow of molten material. The design of the longitudinal grooves 3 not only collects excess molten material, preventing contamination of the welding surface or interference with internal components caused by its random flow, but also allows the molten material to cool and solidify within the longitudinal grooves 3, forming a "mortise and tenon"-like interlocking structure. This significantly increases the contact area and bonding strength of the welding surface, further enhancing the sealing performance of the weld. This allows the welded structure to effectively block the intrusion of moisture, dust, and other impurities, meeting the high protection requirements of the meter. In addition, the horizontal distance f between the G surface and the H surface is set to 1.8 to 2.3 mm. This distance is compatible with the width of the welding rib 1, which ensures that there is a reasonable gap between the welding rib 1 and the G surface and the H surface after the welding rib 1 is inserted, and avoids insufficient positioning accuracy caused by excessive gap, thus achieving a balance between positioning stability and the flow space of molten material.

[0033] like Figure 5 As shown, the depth t of the welding groove 2 is limited to between 2.7 and 3.2 mm. This depth design allows for flexible adjustment based on the amount of overflow during the actual welding process, ensuring sufficient containment of the molten material generated during welding and preventing excessive overflow or insufficient welding due to an overly shallow groove. The vertical height h of surfaces E and F is 1.5–2 mm, matching the height of the welding rib 1. This ensures that after the welding rib 1 is inserted, side S can fully abut against surface E, and side R can fully abut against surface F, forming a complete contact. This provides a uniform contact surface for pressure transmission and heat conduction during welding, ensuring that the welding rib 1 can completely melt and avoiding localized incomplete fusion. This complete abutment design allows the welding rib 1 and the welding groove 2 to form a stable pre-fixed state after assembly, further improving structural stability during welding and reducing alignment deviations caused by vibration.

[0034] like Figure 3 As shown, to balance assembly convenience and welding quality, the gap k between the side of the welding rib 1 and the G and H surfaces is set to 0.15-0.2 mm. This gap avoids assembly difficulties caused by excessive interference fit between the welding rib 1 and the G and H surfaces, allowing the molten material to form a tight fusion structure. The depth of the welding groove 2 is q less than the length of the bottom surface of the welding rib 1: 0.1-0.2 mm, with a preferred difference of 0.2 mm. The gap k and the length difference q together constitute the fusion space 5. During assembly, the cover plate 7 and the shell 8 are precisely aligned, allowing the welding rib 1 to be slowly inserted into the welding groove 2. Through the above-mentioned gap and size matching design, it can be ensured that the S and R sides of the ultrasonic welding rib 1 initially contact the E and F surfaces, achieving a good initial contact state and laying the foundation for the uniformity and stability of subsequent welding.

[0035] The specific operating procedure is as follows: A 20kHz ultrasonic welding machine is used. During the welding process, a vertical pressure of 60N is applied to the joint between the cover plate 7 and the shell 8, while ultrasonic vibration is performed at a frequency of 15kHz. The welding power is strictly controlled at 1200W, and the welding time is 0.5 seconds. Under the combined action of vertical pressure and horizontal shear force, the S and R sides of the welding rib 1, as the initial contact points, first generate frictional heat and melt rapidly. Subsequently, the molten material diffuses outwards under pressure, gradually filling the entire welding groove 2 and completely combining with the D, E, F, G, and H surfaces, ultimately forming a five-dimensional fusion sealing structure. After welding, the overflowing molten material fills the overflow grooves corresponding to the D, G, and F surfaces of the groove, making the molten material inside the entire welding groove 2 a complete unit, achieving a firm overall connection between the cover plate 7 and the shell 8. This five-dimensional fusion method allows the welded structure to form a seal and fixation from multiple dimensions, completely changing the single-point or line contact mode of traditional linear welding and significantly improving the reliability of the welding.

[0036] After welding, the welding quality is verified through a series of rigorous tests. Test results show that the welded connection strength reaches ≥500N in tensile testing, while the connection strength of traditional welded structures is only 200-300N, representing a doubling of the weld strength of this invention. The crystal oscillator frequency deviation is controlled within ≤±1.5ppm, far exceeding industry standards. The waterproof test passes the IP65 standard, and after structural optimization, it can reach the IP67 standard, effectively coping with complex outdoor environments. These test data fully demonstrate the significant advantages of this invention's welded structure in terms of robustness, sealing, and crystal oscillator protection, fully meeting the performance requirements of electricity meter products in different usage scenarios.

[0037] The shear-type structure design of this utility model allows the welding rib 1 to contact the five surfaces (D, E, F, G, and H) within the welding groove 2 simultaneously. During welding, the molten material spreads evenly along the five surfaces. Compared with the traditional linear welding structure, the welding area is increased by 200%-300%, completely avoiding local incomplete fusion. This ensures the overall robustness of the weld from a structural perspective, effectively solving the common problem of weak welds in traditional welding. It also allows the connection between the cover plate 7 and the shell 8 to withstand greater external impact, extending the service life of the meter.

Claims

1. An ultrasonic welding structure for an electric meter, characterized in that, This includes welding ribs installed on the cover plate, which are inserted into welding grooves on the shell. The inner side of the welded rib is connected to the first welded surface, and the outer side is connected to the second welded surface. The second welded surface is higher than the first welded surface. The cross-section of the welding groove is a rectangle with symmetrical chamfers at the bottom. The inner side is connected to the first overflow surface, which has several longitudinal grooves. The outer side is connected to the second overflow surface, and an overflow space is formed between the second overflow surface and the second welding surface.

2. The ultrasonic welding structure for an electric meter according to claim 1, characterized in that, The welding ribs are located at the lower end of the cover plate, and the welding grooves are located on the same side of the upper surface of the shell.

3. The ultrasonic welding structure for an electric meter according to claim 1 or 2, characterized in that, The welded reinforcement has a right-angled trapezoidal cross-section, with the right-angled side at the bottom and the bottom edge on the outside.

4. The ultrasonic welding structure for an electric meter according to claim 3, characterized in that, The angle α between the bottom surface of the welded rib cross-section and the first welded surface is 91° to 95°, and the length l of the top bottom surface is 2.5 to 3 mm.

5. The ultrasonic welding structure for an electric meter according to claim 1 or 4, characterized in that, The bottom two sides of the welded rib are the S side and the R side, respectively. The width d of the right-angled side of the welded rib cross section is 1.5 to 2 mm. The S side abuts against the E side, and the R side abuts against the F side.

6. The ultrasonic welding structure for an electric meter according to claim 2, characterized in that, The bottom surface of the welding groove is surface D, and the two sides of surface D are respectively connected to the inclined surfaces E and F.

7. The ultrasonic welding structure for an electric meter according to claim 6, characterized in that, The angle β between surface E and surface F is 20° to 40°. Surface E is connected to surface G, which is vertically positioned, and surface F is connected to surface H, which is vertically positioned.

8. The ultrasonic welding structure for an electric meter according to claim 7, characterized in that, The top edge of surface G is connected to a first overflow surface, and the top edge of surface H is connected to a second overflow surface. The first welding surface is in contact with the first overflow surface, and a longitudinal overflow space is formed between the first welding surface and several longitudinal grooves.

9. An ultrasonic welding structure for an electric meter according to claim 6 or 7, characterized in that, The depth t of the welding groove is 2.7 to 3.2 mm, and the vertical height h of the E and F surfaces is 1.5 to 2 mm.

10. The ultrasonic welding structure for an electric meter according to claim 9, characterized in that, The gap k between the side of the welded rib and the G and H surfaces is 0.15-0.2 mm, and the depth of the welded groove is q: 0.1-0.2 mm less than the length of the bottom surface of the welded rib.

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