Single-phase electric meter

Abstract

A single-phase electricity meter comprises a shell and an electricity connection structure arranged in the shell, a circuit board is connected to the electricity connection structure, the electricity connection structure comprises a junction box and a plurality of binding posts arranged in the junction box in a press-in mode, diverters are connected to the binding posts, and the diverters are in hard connection with the circuit board; compared with the prior art, the wiring terminal is arranged in the wiring box in the press-in direction, and other structures are not needed to connect the wiring terminal with the wiring box, so that the structure of the wiring box is simpler, the sealing effect of the wiring terminal installed in the wiring box is ensured, and the wiring terminal is more convenient to install through hard connection of the diverter on the wiring terminal and the circuit board. The connection strength of the diverter and the circuit board is ensured, the situation of disconnection between the binding post and the circuit board is avoided, and the quality of the ammeter is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to a single-phase electric meter. BACKGROUND

[0002] Single-phase electric meter (hereinafter referred to as "single-phase electric meter") as a core measuring instrument for measuring single-phase alternating current circuit power consumption, is widely used in residential, small commercial and office environment and other low-voltage distribution terminal. Its basic function is to accumulate the power consumed by the user and convert it into a readable kilowatt-hour (kWh) value, which is the main basis for electricity settlement between power companies and users.

[0003] The existing single-phase electric meter generally adopts a split or modular assembly structure. The main components include: a plastic or metal shell (usually composed of an upper cover and a bottom shell), a terminal block (used to connect the live input / output, zero input / output), an internal PCB mainboard (carrying electronic components), a current sampling element (such as a manganese-copper shunt or a micro current transformer), a display unit (LCD or LED), a communication module (optional, such as carrier wave, wireless module) and a safety protection device (such as a lead seal hole).

[0004] A single-phase electric meter power connection device and an electric meter box are disclosed in Chinese Patent No. 202111473413.8. The disclosed single-phase electric meter power connection device is used to insulate the terminal of the electric meter box and connect the terminal to the single-phase electric meter. The device includes a terminal box assembly and a terminal post assembly. The shell of the terminal box assembly is made of insulating material, and a plurality of wire inlet ports and a plurality of wire outlet ports are provided on the shell. Each wire inlet port is electrically connected to a wire outlet port. The wire outlet ports can be selectively opened or closed. The terminal post assembly is electrically connected to the single-phase electric meter and the wire outlet ports. One end of the terminal post assembly can be inserted into the wire outlet ports, and the other end can be inserted into the single-phase electric meter. Chinese Patent No. 201010174650.X discloses an electric meter box and an electric meter box assembly. The disclosed electric meter box includes an electric meter box body, a switch, an electric meter and a bracket assembled with the electric meter box body. The switch is assembled with the electric meter through the bracket. The electric meter has two first insertion holes matched with two first insertion heads of the switch. After the two first insertion heads of the switch are inserted into the two first insertion holes of the electric meter, the switch and the electric meter are electrically connected. Alternatively, the electric meter has two first insertion heads matched with two first insertion holes of the switch. After the two first insertion heads of the electric meter are inserted into the two first insertion holes of the switch, the switch and the electric meter are electrically connected.

[0005] The existing technology disclosed above is connected with the terminal block and the terminal box through the mounting plate, the connection mode is relatively complex, and the gap between the mounting plate and the terminal box affects the sealing effect of the terminal box. Meanwhile, the terminal block and the circuit board are connected by soft wire welding, which not only makes the soft wire close to the components of the electric meter and affects the components, but also makes the welding point between the soft wire and the circuit board small, and the welding point is easy to break and make the soft wire separate when the electric meter collides, thereby affecting the use of the electric meter. SUMMARY

[0006] The present application is to overcome the defects in the prior art, and to provide a single-phase electric meter with good sealing effect of the connection between the terminal block and the terminal box, and high connection strength between the terminal block and the circuit board.

[0007] In order to achieve the above-mentioned application purpose, the present application adopts the following technical scheme: a single-phase electric meter, comprising a shell and an electric connection structure arranged in the shell, the electric connection structure is connected with a circuit board, the electric connection structure comprises a terminal box and a plurality of terminal blocks arranged in the terminal box in a press-in manner, and a shunt is connected to the terminal block, and the shunt is arranged in a hard connection mode with the circuit board.

[0008] As a preferred scheme of the present application, the terminal box is provided with a plurality of terminal holes arranged along the length direction thereof, the shape of the terminal hole is matched with the shape of the terminal block, and the plurality of terminal blocks are inserted into the corresponding terminal holes.

[0009] As a preferred scheme of the present application, the end of the terminal hole is provided with a limiting ring for limiting the insertion distance of the terminal block, and the limiting ring is arranged at one end facing the outside of the shell.

[0010] As a preferred scheme of the present application, the shunt and the terminal block are connected by impact welding.

[0011] As a preferred scheme of the present application, the bottom of the shunt is provided with two current sampling pins, each of the two current sampling pins is provided with a current pin step, and the two current pin steps are arranged oppositely.

[0012] As a preferred scheme of the present application, the current sampling pin is provided with a voltage sampling pin on one side, the voltage sampling pin is provided with a voltage pin step, and the voltage pin step is arranged on the side close to the current sampling pin.

[0013] As a preferred scheme of the present application, the circuit board is provided with a plurality of connecting holes, and the current sampling pin and the voltage sampling pin are inserted into the corresponding connecting holes.

[0014] As a preferred scheme of the present application, the edge of the circuit board is further provided with a connecting groove for fixed connection with the terminal box, and the terminal box is provided with a plug-in protrusion matched with the connecting groove.

[0015] As a preferred scheme of the present application, the terminal box is provided with an auxiliary terminal, and the terminal box is provided with an auxiliary hole for connecting the auxiliary terminal.

[0016] As a preferred scheme of the present application, the terminal box is further provided with an end cover, and the end cover is provided with a guide groove for sealing.

[0017] Compared with the prior art, the present application has the following beneficial effects: 1. By arranging the terminal post in the terminal box in a press-in direction, the terminal post is connected with the terminal box without using other structures, thereby improving the structure of the terminal box to be simpler, ensuring the sealing effect of the terminal post installed in the terminal box, and ensuring the connection strength of the shunt and the circuit board by hard connecting the shunt on the terminal post with the circuit board, thereby avoiding the disconnection of the terminal post and the circuit board and improving the quality of the electric meter. 2. Further, the current sampling pin and the voltage sampling pin are arranged on the shunt, and the connecting hole is arranged on the circuit board, and the current sampling pin and the voltage sampling pin are inserted into the connecting hole, thereby realizing the connection of the shunt and the circuit board, ensuring the connection strength of the shunt and the circuit board, and ensuring that the shunt will not be disconnected from the circuit board when the electric meter is collided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the electric connection structure of the present application; Figure 3 is a structural schematic diagram of the connection of the terminal box and the terminal post of the present application; Figure 4 is a structural schematic diagram of the connection of the shunt and the circuit board; Figure 5 is a structural schematic diagram of the terminal box The drawing label: shell 1, circuit board 101, connecting hole 1011, connecting groove 1012, electric connection structure 2, terminal box 201, terminal hole 2011, limiting ring 2012, auxiliary hole 2013, insertion protrusion 2014, terminal post 202, shunt 203, current sampling pin 2031, voltage sampling pin 2032, current pin step 2033, voltage pin step 2034, auxiliary terminal 204, end cover 3, guide groove 301. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in detail below with reference to the drawings.

[0020] As Figures 1-5As shown, a single-phase electric meter includes a housing 1 and an electrical connection structure 2 arranged in the housing 1, the electrical connection structure 2 is connected with a circuit board 101, the electrical connection structure 2 includes a terminal box 201 and a plurality of terminal posts 202 arranged in the terminal box 201 in a press-in manner, and the terminal posts 202 are connected with shunts 203, and the shunts 203 are arranged in a hard connection manner with the circuit board 101.

[0021] Further, the electrical connection structure 2 is arranged at one end of the housing 1, and the circuit board 101 is arranged at the other end of the housing 1, a plurality of components of the electric meter are connected on the circuit board 101, and the circuit board 101 is connected with the electrical connection structure 2. Specifically, the electrical connection structure 2 includes the terminal box 201 arranged in the housing 1 and the plurality of terminal posts 202 arranged in the terminal box 201 in a press-in manner. Compared with the prior art in which the terminal posts 202 are connected with the terminal box 201 through a mounting plate, the terminal posts 202 are directly inserted into the terminal box 201 in a press-in manner, so that the structure of the terminal box 201 is simpler, and the sealing effect between the terminal posts 202 and the terminal box 201 is better, thereby improving the sealing performance of the terminal box 201.

[0022] The shunts 203 are connected at the end of the terminal posts 202, the shunts 203 are manganese copper shunts, and the shunts 203 are connected with the circuit board 101 in a hard connection manner, so as to ensure the connection strength of the shunts 203 and the circuit board 101, avoid disconnection of the terminal posts 202 and the circuit board 101, and improve the quality of the electric meter.

[0023] The terminal box 201 is provided with a plurality of terminal holes 2011 arranged along the length direction thereof, the shape of the terminal hole 2011 is matched with the shape of the terminal post 202, the plurality of terminal posts 202 are inserted into the corresponding terminal holes 2011, further, the terminal holes 2011 are arranged along the width direction of the terminal box 201, the terminal holes 2011 are arranged through the terminal box 201, and the plurality of terminal holes 2011 are distributed along the length direction of the terminal box 201. In this embodiment, four terminal holes 2011 are arranged, so that four terminal posts 202 are arranged and inserted into the corresponding terminal holes 2011 in a press-in manner, and the cross-sectional shape of the terminal hole 2011 is the same as the cross-sectional shape of the terminal post 202, that is, the lower part is a circular structure, and the upper part is a rectangular structure, and the circular structure and the rectangular structure are partially overlapped. By arranging the shape, the terminal post 202 will not rotate when being inserted into the terminal hole 2011, the radial direction of the terminal post 202 is limited, and the stability of the terminal post 202 after being installed is ensured.

[0024] Further, the wiring hole 2011 is designed as a flexible structure, so that even if the wiring post 202 is pressed in by a large force, the flexible structure applies the toughness of the PC material, and only deforms without breaking. The maximum distance of the wiring post 202 pressed in under a certain pressure meets the customer's requirements.

[0025] The end of the wiring hole 2011 is provided with a limiting ring 2012 for limiting the insertion distance of the wiring post 202. The limiting ring 2012 is located at one end towards the outside of the shell 1. Further, the limiting ring 2012 is arranged in the wiring hole 2011, and the limiting ring 2012 is located at the end of the wiring hole 2011 and flush with the outer wall of the terminal box 201. The limiting ring 2012 is located at one end close to the outside of the shell 1, i.e. at the wire inlet end. By arranging the limiting ring 2012, the limiting of the wiring post 202 in the axial direction is realized, which ensures that the wiring post 202 is inserted into the wiring hole 2011 and moves out from the end of the wiring hole 2011 due to excessive pressing force. The limiting ring 2012 ensures the installation position of the wiring post 202, thereby improving the installation efficiency.

[0026] The shunt 203 is connected by impact welding with the wiring post 202. Further, the wiring post 202 is made of copper metal material, and the shunt 203 is fixedly connected to the end of the wiring post 202 by impact welding process, and the two ends of the shunt 203 are welded on two adjacent wiring posts 202, as shown in Figure 3 In the present example, four wiring posts 202 are provided, so that one shunt 203 is connected on every two wiring posts 202, and a total of two shunts 203 are provided. By adopting the impact welding process design with the wiring post 202, the lowest copper consumption in the shunt 203 is realized.

[0027] The shunt 203 is provided with two current sampling pins 2031 at the bottom, and the two current sampling pins 2031 are provided with current pin steps 2033. The two current pin steps 2033 are oppositely arranged. Further, the current sampling pin 2031 is arranged at the lower end of the shunt 203, and the current pin step 2033 is arranged at the side of the current sampling pin 2031. The current pin step 2033 is located at the upper end of the current sampling pin 2031. The two current pin steps 2033 on the other two current sampling pins 2031 are arranged on the inner side of the current sampling pin 2031, i.e. the two current pin steps 2033 are oppositely arranged.

[0028] The current sampling pin 2031 is provided with a voltage sampling pin 2032, the voltage sampling pin 2032 is provided with a voltage pin step 2034, the voltage pin step 2034 is arranged close to the side of the current sampling pin 2031, further, the voltage sampling pin 2032 is arranged at the lower end of the shunt 203, and the voltage sampling pin 2032 is located on one side of the current sampling pin 2031, and the voltage pin step 2034 is arranged at the side of the voltage sampling pin 2032, and the setting direction of the voltage pin step 2034 is the same as that of the current pin step 2033 on the current sampling pin 2031 adjacent to the voltage sampling pin 2032.

[0029] As shown in Figure 3 The shunt 203 is provided with three pins at the lower end, of which the left two are current sampling pins 2031, and the right one is a voltage sampling pin 2032, the design of the current pin step 2033 is different from that of the voltage pin step 2034, which is considered from two angles, the resistance value of the manganese copper can be modified by modifying the height of the current pin step 2033, avoiding the influence of tin in the connecting hole 1011 on the resistance value of the manganese copper in the wave soldering production.

[0030] The circuit board 101 is provided with a plurality of connecting holes 1011, the current sampling pin 2031 and the voltage sampling pin 2032 are inserted into the corresponding connecting holes 1011, further, the connecting holes 1011 are arranged at the edge of the circuit board 101, the current sampling pin 2031 and the voltage sampling pin 2032 are inserted into the corresponding connecting holes 1011, and the current sampling pin 2031 or the voltage sampling pin 2032 is fixedly connected with the circuit board 101 by soldering.

[0031] The edge of the circuit board 101 is also provided with a connecting groove 1012 for fixedly connecting with the junction box 201, the junction box 201 is provided with an insertion protrusion 2014 matched with the connecting groove 1012, further, the connecting groove 1012 is arranged at both ends of the circuit board 101 and located on the side close to the junction box 201, the insertion protrusion 2014 is arranged on the junction box 201 and connected in the connecting groove 1012 of the circuit board 101, the positioning of the circuit board 101 on the junction box 201 is realized through the cooperation of the insertion protrusion 2014 and the connecting groove 1012, the installation precision of the circuit board 101 is ensured, and the stability of the circuit board 101 after installation is improved.

[0032] The junction box 201 is provided with an auxiliary terminal 204, the junction box 201 is provided with an auxiliary hole 2013 for connecting the auxiliary terminal 204, further, the auxiliary hole 2013 is arranged between the two junction holes 2011 and penetrates through the junction box 201, and the auxiliary terminal 204 is also inserted into the auxiliary hole 2013 by pressing.

[0033] The terminal box 201 is further provided with an end cover 3, the end cover 3 is provided with a guide groove 301 for lead sealing, further, the guide groove 301 is arranged on both sides of the end cover 3, that is, the end cover 3 is lead sealed with the shell 1 and the terminal box 201, the overall design of the electric meter, the width of the shell 1 in the left and right directions is pressed to the limit, in particular, part of the guide groove 301 for lead sealing is made on the end cover 3, on the basis of not affecting the waterproof of the end cover 3, the guide groove 301 at this place is more compact.

[0034] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application; therefore, the present application shall not be limited to the embodiments shown herein, but shall conform to the broadest scope consistent with the principles and novel features disclosed herein.

[0035] Although the terms such as shell 1, circuit board 101, connecting hole 1011, connecting groove 1012, electrical connection structure 2, terminal box 201, terminal hole 2011, limiting ring 2012, auxiliary hole 2013, plug-in protrusion 2014, terminal post 202, shunt 203, current sampling pin 2031, voltage sampling pin 2032, current pin step 2033, voltage pin step 2034, auxiliary terminal 204, end cover 3, guide groove 301, etc. are used more frequently in the drawings, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present application; any interpretation of them as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A single-phase electric meter comprising a housing (1) and an electric connection structure (2) arranged in the housing (1), an electric circuit board (101) being connected to the electric connection structure (2), characterized in that, The power connection structure (2) comprises a terminal box (201) and a plurality of terminal posts (202) arranged in the terminal box (201) by pressing, and a shunt (203) is connected to the terminal post (202), and the shunt (203) is arranged in hard connection with the circuit board (101).

2. A single phase meter as claimed in claim 1, wherein, The terminal box (201) is provided with a plurality of terminal holes (2011) arranged along the length direction thereof, the shape of the terminal hole (2011) is matched with the shape of the terminal post (202), and the plurality of terminal posts (202) are inserted into the corresponding terminal holes (2011).

3. A single phase meter according to claim 2, wherein, The end of the terminal hole (2011) is provided with a limiting ring (2012) for limiting the insertion distance of the terminal post (202), and the limiting ring (2012) is arranged at one end facing the outside of the shell (1).

4. A single phase meter according to claim 1, wherein, The shunt (203) is connected with the terminal post (202) by impact welding.

5. A single phase meter according to claim 1, wherein, The bottom of the shunt (203) is provided with two current sampling pins (2031), and the current sampling pins (2031) are provided with current pin steps (2033) respectively.

6. A single phase meter according to claim 5, wherein, The current sampling pin (2031) is provided with a voltage sampling pin (2032) on one side, and the voltage sampling pin (2032) is provided with a voltage pin step (2034) on one side.

7. A single phase meter according to claim 6, wherein, The circuit board (101) is provided with a plurality of connecting holes (1011), and the current sampling pin (2031) and the voltage sampling pin (2032) are inserted into the corresponding connecting holes (1011).

8. A single phase meter according to claim 1, wherein, The edge of the circuit board (101) is also provided with a connecting groove (1012) for fixed connection with the terminal box (201), and the terminal box (201) is provided with a plug-in protrusion (2014) matched with the connecting groove (1012).

9. A single phase meter according to claim 1 wherein, The terminal box (201) is provided with an auxiliary terminal (204), and the terminal box (201) is provided with an auxiliary hole (2013) for connecting the auxiliary terminal (204).

10. A single phase meter according to claim 1, wherein, The terminal box (201) is also provided with an end cover (3), and the end cover (3) is provided with a guide groove (301) for lead sealing.

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