Ammeter shell and ammeter

Abstract

The invention provides an electricity meter shell and an electricity meter, the electricity meter shell comprises a shell body, a tail cover and a lead sealing piece, the lead sealing piece is connected with the shell body and the tail cover, the lead sealing piece is provided with a first lead sealing hole and a limiting groove, and the limiting groove divides the first lead sealing hole into a plurality of lead sealing hole sections; the tail cover comprises a tail cover body and a limiting block which are connected, a second lead sealing hole is formed in the tail cover body, the limiting block is arranged in the limiting groove in a penetrating mode, and a third lead sealing hole is formed in the limiting block. When the lead sealing piece is located at the locking position, the first lead sealing hole, the second lead sealing hole and the third lead sealing hole are communicated so that a lead sealing line can penetrate through the lead sealing piece. When the lead sealing piece rotates from the locking position to the opening position, a plurality of dislocation positions are formed between the first lead sealing hole and the second lead sealing hole and between the first lead sealing hole and the third lead sealing hole, so that the bending angle of the lead sealing line when the lead sealing piece rotates from the locking position to the opening position is increased, the resistance of the lead sealing piece during rotation is increased, and if the lead sealing piece is forcibly twisted, the lead sealing piece is not damaged. And only the lead sealing line, the lead sealing piece or the tail cover is damaged, so that the reliability of the lead sealing is improved.

Description

Technical Field

[0001] This invention relates to the field of electricity meters, and particularly to an electricity meter casing and an electricity meter. Background Technology

[0002] To prevent unauthorized tampering, electricity meters are typically equipped with a lead seal on their casing. Existing lead seal structures usually involve using a lead seal screw to connect the casing and the tail cap, and then connecting the lead seal screw and the tail cap with a lead seal wire. The lead seal wire restricts the rotation of the lead seal screw relative to the tail cap, making it impossible to open the meter casing without damaging the lead seal wire or the tail cap.

[0003] However, when the lead seal wire is soft and flexible, it can be forcibly twisted. The lead seal screw can be rotated and restored without breaking the lead seal wire, causing the lead seal function to malfunction, the anti-tampering function to fail, and creating a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that when the lead seal wire is soft and has good toughness, the lead seal wire is prone to breakage when the lead seal screw is rotated, which leads to abnormal lead seal function.

[0005] To solve the above-mentioned technical problems, the present invention provides an electric meter housing, including a housing body, a tail cover, and a lead seal. The tail cover is assembled on the housing body, and the lead seal connects the housing body and the tail cover. The lead seal is rotatable relative to the housing body and the tail cover around its own axis, and rotates between a locked position and an open position. The lead seal has a first lead seal hole and a limiting groove, the limiting groove intersecting the first lead seal hole to divide the first lead seal hole into multiple lead seal hole segments. The tail cover includes a connected tail cover body and a limiting block. The tail cover body has a second lead seal hole located outside the lead seal. The limiting block passes through the limiting groove and has a third lead seal hole. When the lead seal is in the locked position, the first, second, and third lead seal holes are connected to allow the lead seal wire to pass through.

[0006] In some embodiments of this application, the limiting groove is disposed off-center from the lead seal; the limiting groove is arc-shaped, and the center of the limiting groove coincides with the center of the lead seal.

[0007] In some embodiments of this application, the limiting groove includes a first end and a second end along its length direction. When the lead seal is in the locked position, the limiting block abuts against the first end, and when the lead seal is in the open position, the limiting block abuts against the second end.

[0008] In some embodiments of this application, the lead seal includes a frustum and a connecting post, the connecting post being protruded from one end face of the frustum along its axial direction; the end of the connecting post away from the frustum passes through the tail cap body and is connected to the outer shell body; the first lead seal hole and the limiting groove are disposed on the frustum, the first lead seal hole being disposed radially along the frustum, and the limiting groove being located outside the connecting post.

[0009] In some embodiments of this application, the end of the connecting column away from the truncated cone is provided with a buckle, the buckle protruding from one circumferential side surface of the connecting column; the outer shell body is provided with a locking part, the locking part cooperating with the buckle; when the lead seal is rotated relative to the outer shell body to the position where the buckle and the locking part are engaged, the lead seal is in the locked position; when the lead seal is rotated relative to the outer shell body to the position where the buckle and the locking part are disengaged, the lead seal is in the open position.

[0010] In some embodiments of this application, the tail cap body is provided with an assembly through hole, the lead seal is inserted into the assembly through hole of the tail cap body, and the lead seal is rotatable relative to the tail cap body about the axis of the lead seal.

[0011] In some embodiments of this application, the tail cap body has a raised step on the inner wall surface of the mounting through hole, the limiting block is disposed on the raised step, and the end of the limiting block away from the raised step extends away from the outer shell body and is inserted into the limiting groove.

[0012] In some embodiments of this application, the tail cap is provided with a positioning groove, which is located on one end face of the tail cap near the outer shell body; the outer shell body is provided with a positioning block, which is located on one end face of the outer shell body near the tail cap; the positioning block is configured to cooperate with the positioning groove, and the positioning block is inserted into the positioning groove; the positioning groove communicates with the second lead seal hole and the third lead seal hole.

[0013] In some embodiments of this application, the meter housing further includes a lead sealing wire, which passes through the first lead sealing hole, the second lead sealing hole, and the third lead sealing hole to restrict the lead seal to the locking position.

[0014] An electricity meter includes an electrical component and a meter housing, wherein a mounting cavity is formed between the outer body and the tail cover of the meter housing, and the electrical component is mounted in the mounting cavity.

[0015] As can be seen from the above technical solution, the beneficial effects of the present invention are as follows: The meter casing of this application includes a casing body, a tail cover, and a lead seal. The tail cover is assembled on the casing body, and the lead seal connects the casing body and the tail cover. The lead seal can rotate relative to the casing body and the tail cover around its own axis between a locked position and an open position. When the lead seal rotates to the locked position, the tail cover cannot be opened relative to the casing body. The lead seal has a first lead seal hole and a limiting groove. The limiting groove intersects with the first lead seal hole to divide the first lead seal hole into multiple lead seal hole segments. The tail cover includes a connected tail cover body and a limiting block. The tail cover body has a second lead seal hole located on the outside of the lead seal. The limiting block passes through the limiting groove and has a third lead seal hole. When the lead seal is in the locked position, the first lead seal hole, the second lead seal hole, and the third lead seal hole are connected to allow the lead seal wire to pass through. When the lead seal wire is inserted through the first lead seal hole, the second lead seal hole, and the third lead seal hole, the lead seal wire can restrict the lead seal from rotating to the open position.

[0016] The design incorporates a limiting groove on the lead seal, which divides the first lead seal hole into multiple segments. A limiting block is located between two adjacent lead seal hole segments, and a third lead seal hole is provided on the limiting block for the lead seal wire to pass through. After the lead seal wire passes through the first, second, and third lead seal holes, when the lead seal rotates from the locked position to the open position, multiple misalignments occur between the first and second lead seal holes, and between the first and third lead seal holes. This increases the bending angle of the lead seal wire when the lead seal rotates from the locked position to the open position, and also increases the resistance when the lead seal rotates. If it is forcibly twisted, it will only damage the lead seal wire, the lead seal, or the tail cover, thereby improving the reliability of the lead seal, preventing abnormalities in the lead seal function, and thus preventing the meter from being tampered with. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the meter casing in one embodiment.

[0018] Figure 2 This is a front view structural diagram of the meter casing in one embodiment.

[0019] Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the meter casing at point AA.

[0020] Figure 4 yes Figure 3 The diagram shows a cross-sectional view of the meter casing at point BB.

[0021] Figure 5 yes Figure 3 A schematic diagram of the structure in the explosive state.

[0022] Figure 6This is a schematic diagram of the outer shell body in a three-dimensional state in one embodiment.

[0023] Figure 7 yes Figure 6 The diagram shows a top view of the outer casing.

[0024] Figure 8 yes Figure 6 The diagram shows the front view of the outer shell.

[0025] Figure 9 This is a schematic diagram of the tail cap in a three-dimensional state in one embodiment.

[0026] Figure 10 yes Figure 9 The diagram shows a top view of the tail cap structure.

[0027] Figure 11 yes Figure 9 The diagram shows the main structural view of the tail cover.

[0028] Figure 12 This is a schematic diagram of the lead seal in a three-dimensional state in one embodiment.

[0029] Figure 13 yes Figure 12 The diagram shows the main structural view of the lead seal.

[0030] Figure 14 This is a schematic diagram of the lead seal when it is in the locked position.

[0031] Figure 15 This is a schematic diagram of the lead seal when it is in the locked position and the open position.

[0032] The reference numerals in the attached drawings are explained as follows: 1-Outer shell body; 11-Mounting hole; 12-First clearance opening; 13-Clocking part; 14-Positioning block; 2-Tail cover; 21-Tail cover body; 211-Assembly through hole; 212-Second lead seal hole; 213-Positioning groove; 214-Raised step; 215-Second clearance opening; 216-Locking position mark; 217-Opening position mark; 22-Limiting block; 221-Third lead seal hole; 3-Lead seal; 31-Frustum; 311-First lead seal hole; 3111-First lead seal hole section; 3112-First lead seal hole section; 312-Limiting groove; 3121-First end; 3122-Second end; 313-Indicator mark; 32-Connecting post; 321-Snap; 322-Anti-disengagement tooth; 4-Lead seal line. Detailed Implementation

[0033] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0034] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] See Figures 1 to 5 An electricity meter includes electrical components and a meter housing. The meter housing includes a housing body 1 and a tail cover 2, with the tail cover 2 mounted on the front of the housing body 1. The housing body 1 and the tail cover 2 together form an installation cavity. The electrical components can be a power metering unit or a wireless communication component. The electrical components are installed in the installation cavity, so that the meter housing protects the electrical components and prevents unauthorized tampering with the meter.

[0037] The meter casing also includes a lead seal 3, which connects the casing body 1 and the tail cover 2. The lead seal 3 can rotate relative to the casing body 1 and the tail cover 2 around its own axis. The lead seal 3 can rotate between a locked position and an open position. When the lead seal 3 is in the locked position, it is connected to the casing body 1 and the tail cover 2, preventing the tail cover 2 from being opened. When the lead seal 3 is in the open position, it is not connected to the casing body 1, allowing the tail cover 2 to be opened.

[0038] The meter casing also includes a lead seal wire 4. When the lead seal 3 is in the locked position, the lead seal wire 4 connects the tail cap 2 and the lead seal 3, preventing the lead seal 3 from rotating from the locked position to the open position. Forcibly twisting the lead seal 3 will only damage the lead seal wire 4, the lead seal 3, or the tail cap 2.

[0039] See 6 to Figure 8The outer casing 1 is provided with a mounting hole 11, which is used to connect with the lead seal 3, so that the tail cap 2 is connected to the outer casing 1 through the lead seal 3.

[0040] In one embodiment, the outer casing 1 is provided with a first clearance opening 12, which is located on the side wall of the mounting hole 11. The first clearance opening 12 allows the lead seal 3 to pass smoothly through the mounting hole 11 and be fastened to the outer casing 1.

[0041] The outer casing 1 is provided with a locking part 13, which is used to engage with the lead seal 3. Figure 6 In the embodiment shown, the locking part 13 is a slot structure. The slot is provided on the side wall of the mounting hole 11 and is located at the end of the mounting hole 11 away from the tail cover 2. One end of the slot is connected to the first clearance opening 12, so that when the lead seal 3 is inserted into the mounting hole 11 and rotated to the locking position, the lead seal 3 is engaged with the slot, thereby realizing the connection between the lead seal 3 and the outer shell body 1.

[0042] exist Figure 8 In the embodiment shown, the mounting hole 11 is a blind hole. It should be noted that the mounting hole 11 can also be a through hole. When the mounting hole 11 is a through hole, the outer shell body 1 may not have a locking part 13, and the lead seal 3 is engaged with the edge of the mounting hole 11 away from the tail cap 2.

[0043] The outer casing 1 is provided with a positioning block 14, which is located on one end face of the outer casing 1 near the tail cover 2. The positioning block 14 protrudes forward relative to the surface of the outer casing 1. The positioning block 14 can be used to position and engage with the tail cover 2, and can also be used to form the second lead seal hole 212 and the third lead seal hole 221 with the tail cover 2.

[0044] exist Figure 6 In the illustrated embodiment, multiple positioning blocks 14 are provided, each corresponding to the position of the second lead-sealed hole 212 and the third lead-sealed hole 221. The positioning blocks 14 are used to be inserted into the tail cap 2 to form the second lead-sealed hole 212 and the third lead-sealed hole 221. It should be noted that the positioning blocks 14 may not be provided on the outer shell body 1.

[0045] See Figures 9 to 11 The tail cap 2 is located on the front of the outer casing 1. The tail cap 2 includes a tail cap 2 body and a limiting block 22. The limiting block 22 is located on the side of the tail cap 2 body facing away from the outer casing 1, i.e., the limiting block 22 protrudes from the front of the tail cap 2 body. The tail cap 2 body has a mounting through hole 211, the position of which corresponds to the position of the mounting hole 11. The mounting through hole 211 allows the lead seal 3 to pass through.

[0046] The tail cap 2 body has a second lead-sealing hole 212 on the outside of the mounting through hole 211. The second lead-sealing hole 212 is inclined and communicates with the mounting through hole 211. That is, one end of the second lead-sealing hole 212 is located on the side wall of the mounting through hole 211, and the other end is located on the surface of the tail cap 2 body.

[0047] exist Figure 11 In the illustrated embodiment, the tail cap 2 body is provided with second lead-sealing holes 212 on both sides of the assembly through hole 211. The second lead-sealing holes 212 on both sides of the assembly through hole 211 are symmetrically arranged. The two second lead-sealing holes 212 are located on the same plane passing through the axis of the assembly through hole 211, which facilitates the lead-sealing wire 4 to pass through the two second lead-sealing holes 212 in sequence.

[0048] The tail cover 2 body has a positioning groove 213 on the side near the outer shell body 1. The positioning groove 213 can cooperate with the positioning block 14 on the outer shell body 1 to achieve alignment between the tail cover 2 body and the outer shell body 1. Figure 11 In the illustrated embodiment, the positioning groove 213 corresponds to the second lead-sealing hole 212, and the positioning groove 213 communicates with the second lead-sealing hole 212. After the tail cap 2 is assembled onto the outer shell body 1, the positioning block 14 is inserted into the positioning groove 213, and the outer shell body 1 forms the second lead-sealing hole 212 by surrounding the positioning block 14 with the tail cap 2 body. In other words, the tail cap 2 body has a groove on the side near the outer shell body 1, and after the positioning block 14 is inserted into the groove, there is a gap between the top of the positioning block 14 and the bottom of the groove, which forms the second lead-sealing hole 212.

[0049] The tail cap 2 body has a raised step 214 on the inner wall of the mounting through hole 211, and the raised step 214 is located on the side of the mounting through hole 211 closer to the outer shell body 1. The second lead seal hole 212 is located on the side of the raised step 214 away from the outer shell body 1. The raised step 214 has a second clearance opening 215, and the position of the second clearance opening 215 corresponds to the position of the first clearance opening 12, so that the lead seal 3 can pass through the second clearance opening 215 and the first clearance opening 12.

[0050] The front surface of the tail cap 2 body is provided with a locking position mark 216 and an opening position mark 217. The locking position mark 216 and the opening position mark 217 are used in conjunction with the marks on the lead seal 3 to facilitate the identification of the position of the lead seal 3.

[0051] A limiting block 22 is disposed on the raised step 214, with one end of the limiting block 22 away from the raised step 214 extending away from the outer casing body 1. The limiting block 22 is located between the second lead-sealing holes 212 on both sides of the assembly through hole 211. One or multiple limiting blocks 22 can be provided. When multiple limiting blocks 22 are provided, they are spaced apart along one direction. Figure 9In the embodiment shown, a limiting block 22 is provided.

[0052] The limiting block 22 is provided with a third lead-sealing hole 221. The third lead-sealing hole 221 is located between the second lead-sealing holes 212 on both sides of the assembly through hole 211, and is on the same plane passing through the axis of the assembly through hole 211 as the two second lead-sealing holes 212, so that when the lead-sealing wire 4 passes through the second lead-sealing hole 212, it can also pass through the third lead-sealing hole 221. Preferably, the openings at both ends of the third lead-sealing hole 221 are directly opposite the two second lead-sealing holes 212.

[0053] exist Figure 11 In the illustrated embodiment, the positioning groove 213 is also connected to the third lead-sealing hole 221, meaning the third lead-sealing hole 221 is also formed by the outer shell body 1 surrounding the positioning block 14 within the tail cap 2 body. The third lead-sealing hole 221 is formed in the same way as the second lead-sealing hole 212. That is, the tail cap 2 body has a groove on the side near the outer shell body 1. After the positioning block 14 is inserted into the groove, there is a gap between the top of the positioning block 14 and the bottom of the groove, and this gap forms the second lead-sealing hole 212 and the third lead-sealing hole 221.

[0054] When producing the tail cap 2, since the positioning groove 213 is connected to the second lead sealing hole 212 and the third lead sealing hole 221, the positioning groove 213 and the second lead sealing hole 212 and the third lead sealing hole 221 can be formed simultaneously during the injection molding of the tail cap 2. There is no need to set up a drilling process, which reduces the production process and makes the production of the tail cap 2 more convenient and reduces the processing difficulty. There is also no need to set up a core-pulling structure in the mold for producing the second lead sealing hole 212 and the third lead sealing hole 221, which makes the mold structure simpler and reduces the mold cost, thereby reducing the production cost of the tail cap 2 and the production cost of the meter casing.

[0055] See Figure 12 and Figure 13 The lead seal 3 has a first lead seal hole 311 and a limiting groove 312. The number of limiting grooves 312 is equal to the number of limiting blocks 22, and the positions of the limiting grooves 312 and the limiting blocks 22 correspond one-to-one. The limiting grooves 312 intersect with the first lead seal hole 311 to divide the first lead seal hole 311 into multiple lead seal hole segments. After the lead seal 3 is installed on the tail cap 2, the limiting blocks 22 pass through the limiting grooves 312. When the lead seal 3 is in the locked position, the first lead seal hole 311, the second lead seal hole 212, and the third lead seal hole 221 are connected to allow the lead seal wire 4 to pass through. Figure 14As shown. The top of the positioning block 14 smoothly transitions to the side wall of the first lead-sealing hole 311, facilitating the passage of the lead-sealing wire 4 through the first lead-sealing hole 311, the second lead-sealing hole 212, and the third lead-sealing hole 221. When the lead seal 3 rotates from the locked position to the open position, multiple misalignments are formed between the first lead-sealing hole 311 and the second lead-sealing hole 212, and between the first lead-sealing hole 311 and the third lead-sealing hole 221. This increases the bending angle of the lead-sealing wire 4 when the lead seal 3 rotates from the locked position to the open position, and also increases the resistance when the lead seal 3 rotates. Figure 15 As shown. Forcibly twisting it will only damage the lead seal line 4, the lead seal 3, or the tail cap 2, thereby improving the reliability of the lead seal, avoiding problems with the lead seal function, and thus preventing the meter from being tampered with.

[0056] For example, such as Figure 14 and Figure 15 As shown, the limiting groove 312 divides the first lead-sealing hole 311 into a first lead-sealing hole segment 3111 and a second lead-sealing hole segment 3112. When the lead-sealing wire 4 passes through the first lead-sealing hole 311, the second lead-sealing hole 212, and the third lead-sealing hole 221, it passes through the second lead-sealing hole 212, the first lead-sealing hole segment 3111, the third lead-sealing hole 221, the second lead-sealing hole segment 3112, and the second lead-sealing hole 212 in sequence. When the lead-sealing part 3 rotates from the locked position to the open position, misalignment is formed between the second lead-sealing hole 212 and the first lead-sealing hole segment 3111, between the first lead-sealing hole segment 3111 and the third lead-sealing hole 221, between the third lead-sealing hole 221 and the second lead-sealing hole segment 3112, and between the second lead-sealing hole segment 3112 and the second lead-sealing hole 212. This increases the bending angle of the lead-sealing wire 4 when the lead-sealing part 3 rotates from the locked position to the open position, and also increases the resistance when the lead-sealing part 3 rotates.

[0057] See Figure 12 The limiting groove 312 is located off-center from the center of the lead seal 3. The limiting groove 312 is arc-shaped, and its center coincides with the center of the lead seal 3. This causes relative movement between the limiting block 22 and the limiting groove 312 when the lead seal 3 rotates. Furthermore, when the lead seal 3 rotates from the locked position to the open position, the misalignment distance between the first lead seal hole 311 and the second lead seal hole 212, and between the first lead seal hole 311 and the third lead seal hole 221, is greater, increasing the bending angle of the lead seal line 4 and increasing the resistance when the lead seal 3 rotates.

[0058] The limiting groove 312 includes a first end 3121 and a second end 3122 along its length. When the lead seal 3 is in the locked position, the limiting block 22 abuts against the first end 3121; when the lead seal 3 is in the open position, the limiting block 22 abuts against the second end 3122. By setting the abutment of the lead seal 3 against the end of the limiting groove 312 to correspond to the locked and open positions, it is convenient, quick, and accurate to rotate the lead seal 3 to the locked or open position.

[0059] Specifically, the lead seal 3 includes a frustum 31 and a connecting post 32, with the connecting post 32 protruding from one end face of the frustum 31 along its axial direction. When the lead seal 3 is connected to the tail cap 2 and the outer shell body 1, the end of the connecting post 32 away from the frustum 31 passes through the mounting through hole 211 on the tail cap 2 and connects to the outer shell body 1. Moreover, the frustum 31 abuts against the side of the tail cap 2 away from the outer shell body 1, so that the tail cap 2 is fixed to the outer shell body 1 by the lead seal 3.

[0060] exist Figure 3 In the illustrated embodiment, the frustum 31 is located in the mounting through hole 211, and the frustum 31 abuts against the side of the raised step 214 facing away from the outer shell body 1. A latch 321 is provided at the end of the connecting post 32 away from the frustum 31. The latch 321 protrudes from one circumferential surface of the connecting post 32 and engages with the locking part 13. The connecting post 32 is inserted into the mounting hole 11, and the latch 321 on the connecting post 32 engages with the locking part 13 on the outer shell body 1. That is, when the lead seal 3 rotates relative to the outer shell body 1 to the position where the latch 321 engages with the locking part 13, the lead seal 3 is in the locked position; when the lead seal 3 rotates relative to the outer shell body 1 to the position where the latch 321 separates from the locking part 13, the lead seal 3 is in the open position.

[0061] When the lead seal 3 is inserted into the assembly through hole 211 and the mounting hole 11, the lead seal 3 is in the open position. At this time, the position of the buckle 321 on the connecting post 32 corresponds to the positions of the second clearance opening 215 and the first clearance opening 12, so that the buckle 321 passes through the second clearance opening 215 and the first clearance opening 12, thereby allowing the connecting post 32 to be smoothly inserted into the assembly through hole 211 and the mounting hole 11. After the lead seal 3 is inserted into the assembly through hole 211 and the mounting hole 11, the lead seal 3 is rotated, so that the buckle 321 rotates to the position of engaging with the locking part 13, thereby preventing the tail cover 2 from being opened. The lead seal 3 and the outer shell body 1 are connected by a buckle 321, which makes the required rotation angle of the lead seal 3 small, the connection convenient and reliable, and the structure simple, reducing production costs. Figure 2 In the illustrated embodiment, the lead seal 3 can be rotated from the open position to the locked position by rotating approximately 90°, thereby allowing the lead seal thread 4 to be threaded through and the lead seal to be applied, achieving the purpose of sealing and reducing installation time. It should be noted that the angle at which the lead seal 3 rotates from the open position to the locked position can also be set to other values.

[0062] See Figure 13 In one embodiment, the connecting post 32 is provided with an anti-detachment locking tooth 322 in the middle, which protrudes from one circumferential side surface of the connecting post 32. The lead seal 3 is assembled on the tail cover 2. The anti-detachment locking tooth 322 and the truncated cone 31 abut against the two sides of the protruding step 214 of the tail cover 2, and the lead seal 3 can rotate relative to the tail cover 2 body around the axis of the lead seal 3, so that the lead seal 3 is rotatably connected to the tail cover 2, preventing the lead seal 3 from separating from the tail cover 2, avoiding the loss of the lead seal 3, and also reducing installation time.

[0063] Preferably, the width of the anti-detachment tooth 322 is slightly larger than the width of the positioning groove 213. When the lead seal 3 is assembled onto the tail cap 2, the anti-detachment tooth 322 is first rotated to a position directly opposite the positioning groove 213, and then the lead seal 3 is pressed into 211, making the assembly between the lead seal 3 and the tail cap 2 easier.

[0064] The first lead-sealing hole 311 and the limiting groove 312 are disposed on the frustum 31. The first lead-sealing hole 311 is arranged radially along the frustum 31, and the limiting groove 312 is located outside the connecting post 32. When the lead seal 3 is in the locked position, the first lead-sealing hole 311, the second lead-sealing hole 212, and the third lead-sealing hole 221 are connected, so that the lead-sealing wire 4 can pass through the first lead-sealing hole 311, the second lead-sealing hole 212, and the third lead-sealing hole 221 to restrict the lead seal 3 to the locked position.

[0065] In one embodiment, the limiting groove 312 is open at both ends of the lead seal 3 in the axial direction, so that the relative position between the limiting block 22 and the limiting groove 312 can be observed from the outside of the meter, thereby intuitively knowing whether the lead seal 3 is in the locked position or the open position.

[0066] In one embodiment, an indicator mark 313 is provided on the end face of the frustum 31 facing away from the connecting post 32. When the lead seal 3 is rotated to the locked position, the indicator mark 313 points to the locked position mark 216 on the tail cover 2. When the lead seal 3 is rotated to the open position, the indicator mark 313 points to the open position mark 217 on the tail cover 2.

[0067] In one embodiment, the outer casing 1, the tail cap 2, and the lead seal 3 are all made of plastic, reducing the types of materials and facilitating material recycling and utilization. Moreover, compared to the existing lead seal method that involves setting a metal nut on the outer casing 1 and then connecting the tail cap 2 to the metal nut with a metal lead seal screw, the meter casing of this application simplifies the production process, makes production more convenient, improves production efficiency, and reduces equipment and manpower investment.

[0068] The meter casing of this application includes a casing body 1, a tail cover 2, and a lead seal 3. The tail cover 2 is mounted on the casing body 1, and the lead seal 3 connects the casing body 1 and the tail cover 2. The lead seal 3 can rotate around its own axis relative to the casing body 1 and the tail cover 2 between a locked position and an open position. When the lead seal 3 is rotated to the locked position, the tail cover 2 cannot be opened relative to the casing body 1. The lead seal 3 has a first lead seal hole 311 and a limiting groove 312. The limiting groove 312 intersects with the first lead seal hole 311 to divide the first lead seal hole 311 into multiple lead seal hole segments. The tail cap 2 includes a connected tail cap 2 body and a limiting block 22. The tail cap 2 body has a second lead seal hole 212, which is located on the outside of the lead seal 3. The limiting block 22 passes through the limiting groove 312 and has a third lead seal hole 221. When the lead seal 3 is in the locked position, the first lead seal hole 311, the second lead seal hole 212, and the third lead seal hole 221 are connected to allow the lead seal wire 4 to pass through. When the lead seal wire 4 passes through the first lead seal hole 311, the second lead seal hole 212, and the third lead seal hole 221, the lead seal wire 4 can restrict the lead seal 3 from rotating to the open position.

[0069] Specifically, a limiting groove 312 is provided on the lead seal 3, which divides the first lead seal hole 311 into multiple lead seal hole segments. A limiting block 22 is provided on the tail cap 2, that is, the limiting block 22 is located between two adjacent lead seal hole segments. The limiting block 22 is provided with a third lead seal hole 221 for the sealing wire to pass through. After the lead seal wire 4 passes through the first lead seal hole 311, the second lead seal hole 212, and the third lead seal hole 221, when the lead seal 3 rotates from the locked position to the open position... There are multiple misalignments between the first lead seal hole 311 and the second lead seal hole 212, and between the first lead seal hole 311 and the third lead seal hole 221. This increases the bending angle of the lead seal line 4 when the lead seal 3 rotates from the locked position to the open position, and also increases the resistance when the lead seal 3 rotates. If it is forcibly twisted, it will only damage the lead seal line 4, the lead seal 3, or the tail cap 2, thereby improving the reliability of the lead seal, avoiding abnormal problems in the function of the lead seal, and thus preventing the meter from being tampered with.

[0070] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A meter casing, characterized in that, The device includes a housing body, a tail cap, and a lead seal. The tail cap is mounted on the housing body, and the lead seal connects the housing body and the tail cap. The lead seal is rotatable relative to the housing body and the tail cap about its own axis, and rotates between a locked position and an open position. The lead seal has a first lead seal hole and a limiting groove, the limiting groove intersecting with the first lead seal hole to divide the first lead seal hole into multiple lead seal hole segments; the tail cap includes a connected tail cap body and a limiting block, the tail cap body having a second lead seal hole located on the outside of the lead seal; the limiting block passes through the limiting groove, and the limiting block has a third lead seal hole; when the lead seal is in the locked position, the first lead seal hole, the second lead seal hole, and the third lead seal hole are connected to allow the lead seal wire to pass through.

2. The meter casing according to claim 1, characterized in that, The limiting groove is located at a position off-center from the lead seal; The limiting groove is arc-shaped, and the center of the limiting groove coincides with the center of the lead seal.

3. The meter casing according to claim 2, characterized in that, The limiting groove includes a first end and a second end along its length. When the lead seal is in the locked position, the limiting block abuts against the first end. When the lead seal is in the open position, the limiting block abuts against the second end.

4. The meter casing according to claim 2, characterized in that, The lead seal includes a frustum and a connecting post, the connecting post being protruded from one end face of the frustum along its axial direction; the end of the connecting post away from the frustum passes through the tail cap body and is connected to the outer shell body. The first lead-sealing hole and the limiting groove are disposed on the circular platform. The first lead-sealing hole is disposed radially along the circular platform, and the limiting groove is located on the outside of the connecting column.

5. The meter housing according to claim 4, characterized in that, The end of the connecting column away from the truncated cone is provided with a buckle, which protrudes from one circumferential side surface of the connecting column; The outer shell body is provided with a locking part, which is configured to cooperate with the buckle; When the lead seal is rotated relative to the outer shell body to the position where the buckle engages with the locking part, the lead seal is in the locked position; When the lead seal is rotated relative to the outer casing to the position where the buckle and the locking part are separated, the lead seal is in the open position.

6. The meter casing according to claim 1, characterized in that, The tail cap body is provided with an assembly through hole, and the lead seal is inserted into the assembly through hole of the tail cap body. The lead seal can rotate relative to the tail cap body around the axis of the lead seal.

7. The meter housing according to claim 6, characterized in that, The tail cap body has a raised step on the inner wall surface of the mounting through hole. The limiting block is disposed on the raised step. The end of the limiting block away from the raised step extends away from the outer shell body and is inserted into the limiting groove.

8. The meter housing according to claim 1, characterized in that, The tail cap is provided with a positioning groove, which is located on one end face of the tail cap near the outer shell body; the outer shell body is provided with a positioning block, which is located on one end face of the outer shell body near the tail cap; the positioning block is configured to cooperate with the positioning groove, and the positioning block is inserted into the positioning groove; The positioning groove is connected to the second lead-sealed hole and the third lead-sealed hole.

9. The meter housing according to claim 1, characterized in that, The meter casing also includes a lead sealing wire, which passes through the first lead sealing hole, the second lead sealing hole, and the third lead sealing hole to restrict the lead seal to the locking position.

10. An electricity meter, characterized in that, The device includes electrical components and a meter housing as described in any one of claims 1-9, wherein a mounting cavity is formed between the outer casing and the tail cap of the meter housing, and the electrical components are mounted within the mounting cavity.

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