WO2021051825A1

WO2021051825A1 - Electrical energy meter with communication module

Info

Publication number: WO2021051825A1
Application number: PCT/CN2020/089355
Authority: WO
Inventors: 唐健; 林国庆; 魏章波; 山峰
Original assignee: 宁波三星医疗电气股份有限公司
Priority date: 2019-09-20
Filing date: 2020-05-09
Publication date: 2021-03-25
Also published as: SE545382C2; SE2250337A1

Abstract

An electrical energy meter with a communication module (2). The electrical energy meter comprises a base (1) and the communication module (2) arranged on the base (1), a module cover (3) covers the base (1) at a position corresponding to the communication module (2), the communication module (2) is located between the base (1) and the module cover (3), a connector lug (4) used for connecting to an external antenna (6) is arranged on the communication module (2), and the module cover (3) is provided with an opening (31) allowing the connector lug (4) to partially penetrate at the position corresponding to the connector lug (4). The electrical energy meter can connect the external antenna (6) without opening the module cover (3), and the module cover (3) and the communication module (2) are in sealed connection by means of a sealing member, preventing water, dust and the like from permeating into the module cover (3) via the inner edge of the opening (31) and making contact with the communication module (2), and the service life of the communication module (2) is prolonged.

Description

Electric energy meter with communication module

Technical field

The invention relates to the technical field of electric energy meters, in particular to an electric energy meter with a communication module.

Background technique

Electric energy meter is a meter used to measure electric energy, also known as watt-hour meter, fire meter, kilowatt-hour meter, which refers to an instrument that measures various electrical quantities. At present, electric energy meters have the advantages of small size, high precision, good reliability, and convenient installation. , It is more and more common in industrial production and life.

The current electric energy meter is usually provided with a communication module. Specifically, the electric energy meter is provided with a receiving cavity for installing the communication module, a module box is arranged outside the communication module, and the wall plate of the module box of the module is provided with an antenna for installing Opening to facilitate subsequent installation of the antenna. For example, the Chinese utility model patent "A single-phase smart electric energy meter" with the patent number CN201720745380.0 (authorized announcement number CN207067205U), the single-phase intelligent electric energy meter includes a bottom box and PCBA and G3-PLC communication installed in it. Module, the bottom box is arranged with a module box and antenna mounting components, the module box is connected with the PCBA as a whole, the side wall of the bottom box corresponds to the module box with a gap for installing the antenna component, the module box is used to install the GPRS communication module, the antenna The mounting member is used to locate the built-in antenna or the connection line of the external antenna connector. The above-mentioned electric energy meter realizes the subsequent installation of the external antenna, but in the process of long-term use, water may pass through the side wall of the bottom box The gap in the module enters the module box and damages the electrical components of the communication module, which may cause the meter communication to malfunction, affect meter reading and reduce the service life of the meter; in addition, when installing, you need to open the cover at the module to achieve The installation of an external antenna increases the inconvenience of installation.

Therefore, the existing electric energy meter needs to be further improved.

Summary of the invention

The first technical problem to be solved by the present invention is to provide an electric energy meter with a communication module in view of the above-mentioned current state of the art, which can directly install or replace an external antenna without opening the module cover.

The second technical problem to be solved by the present invention is to provide an electric energy meter that prevents water and dust from entering the communication module through the connection of the external antenna in view of the above-mentioned current state of the art.

The third technical problem to be solved by the present invention is that the conventional short antenna is installed inside the module cover, and the antenna connector is exposed outside the meter, and the connector is directly welded to the module PCB, reducing signal attenuation and interference, and improving antenna signal strength.

The fourth technical problem to be solved by the present invention is to provide a kind of electric energy that can automatically switch between the built-in antenna function and the external antenna function to improve the wireless information transmission efficiency of the electric meter and reduce the troublesome operation of the electric energy according to the above-mentioned current state of the art. table.

The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: an electric energy meter with a communication module, comprising a base and a module cover, a module cover and a communication module arranged on the base, a built-in antenna module, and an external antenna module And a processing module, the base is covered with a module cover at a position corresponding to the communication module, and the communication module is located between the base and the module cover, characterized in that: the communication module is provided with a wiring for connecting an external antenna The module cover is provided with an opening for the terminal to pass through at a position corresponding to the terminal.

Preferably, the opening is an oblate hole that avoids at least two external antennas.

The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: when the module cover is installed on the base, the module cover and the communication module form a sealed connection through a sealing element, and the sealing element is located at Outside the opening.

The sealing element may be arranged inside the module cover and tightly attached to the front wall plate of the communication module after assembly. Preferably, the sealing element is a sealing ring arranged on the back of the module cover.

In order to facilitate the installation of the sealing ring, the back of the module cover has a first annular flange and a second annular flange which extend in the direction of the communication module and are arranged at intervals from the inside to the outside. The sealing ring is located at the Between the first annular flange and the second annular flange.

In order to further prevent water from penetrating through the edge of the opening and contacting the communication module, the first ring-shaped flange is formed by extending the inner peripheral wall of the opening toward the communication module, and when the module is covered on the base, Next, the rear wall surface of the first annular flange abuts against the front wall surface of the communication module.

Preferably, the communication module includes a module box and a first circuit board arranged in the module box, the module box is provided with a perforation through which one end portion of the wiring head penetrates, and the perforation is arranged opposite to the opening , The other end of the terminal has a plug-in unit that can be plugged into the first circuit board. The perforated setting facilitates the connection between the terminal and the first circuit board.

In order to make the structure of the entire electric energy meter more compact, the module box is arranged at the upper end of the base, and the module box includes a lower box body and an upper box cover arranged on the lower box body. A mounting cavity for accommodating the first circuit board is enclosed between the body and the upper box cover, and the perforation is opened on the front wall plate of the upper box cover.

In order to facilitate the installation of the upper box cover and the lower box body, the outer peripheral wall of the upper box cover is provided with at least three downwardly extending convex plates. The convex plates are provided with button holes. Correspondingly, the lower box body The upper part is provided with a snap-in part that can be snapped into the corresponding buckle hole, and the lower box body is connected with the upper box cover through the cooperation of the snap-in part and the buckle hole. The snap connection between the upper box cover and the lower box body is more convenient.

Preferably, a watch cover is provided on the base, the watch cover is located below the module cover, and a second circuit board is provided in the space between the watch cover and the base, and the bottom of the lower box body The wall is provided with an escape port for avoiding the connector, and the first circuit board is connected with the second circuit board through the connector. The arrangement of the meter cover, the module cover, the first circuit board and the second circuit board improves the compactness of the electric energy meter and facilitates the connection of the first circuit board and the second circuit board.

There are many ways to form the accommodating cavity. Preferably, the upper end of the base extends forward to form a support plate, the top plate of the watch cover and the support plate are opposed to each other, and a connector is formed between the joint surfaces. An accommodating cavity for accommodating the module box is formed between the supporting plate, the top plate of the watch cover, and the rear wall plate of the base.

In order to prevent the module box from shaking in the accommodating cavity and creating a gap with the module cover, the rear panel of the module box extends backwards with a limiting rib. When the module box is installed, the limiting rib The rear end face of the accommodating cavity abuts against the rear wall plate. Prevent the module box from shaking in the accommodating cavity to prevent a gap between the module box and the module cover at the opening, thereby preventing water from infiltrating through the opening and contacting the module box; in addition, the presence of the limiting rib increases the module The strength of the box. Preferably, the limiting ribs are extended up and down on the rear plate of the upper box cover, and there are at least two limiting ribs arranged at intervals from the left and the right.

Further, it also includes a strobe switch and a detection module, the built-in antenna module and the external antenna module are respectively connected to the communication module through the strobe switch, and the output end of the processing module is connected to the strobe switch;

The detection module is connected between the external antenna module and the processing module to detect the DC voltage value between the external antenna module and the gate switch, and the processing module controls the gate switch and the gate switch according to the magnitude of the DC voltage value transmitted by the detection module The built-in antenna module is connected or connected with the external antenna module.

Further, the detection module includes a DC voltage source and an AD sampling module, one end of the AD sampling module is connected between the external antenna module and the strobe switch and the other end is connected to the processing module, and the collected external antenna module is connected to the The DC voltage value between the strobe switches is transmitted to the processing module.

Further, the external antenna module includes an external antenna and a first resistor whose one end is connected to the external antenna and the other end is grounded.

Preferably, the strobe switch is a radio frequency switch.

Still further, the AD sampling module includes a second resistor whose one end is connected to a direct current voltage source and the other end is electrically connected to the one end of the first resistor, and the AD sampling module collects the direct current between the first resistor and the second resistor. Voltage value.

Still further, the AD sampling module further includes a first isolation module for isolating the AC RF signal generated from the external antenna module. One end of the first isolation module is connected between the external antenna and the first resistor, and the other end is connected to the second resistor. The other end is connected.

Further, the AD sampling module further includes a second isolation module for isolating AC signals, one end of the second isolation module is connected to the other end of the second resistor, and the other end is connected to the input end of the processing module.

Preferably, the first isolation module is an inductor L; and the second isolation module is an RC low-pass filter.

Finally, the RC low-pass filter includes a third resistor and a second capacitor, one end of the third resistor is connected to the other end of the second resistor, and the other end is connected to the input end of the processing module, and one end of the second capacitor is connected Between the third resistor and the input end of the processing module and the other end is grounded.

Compared with the prior art, the communication module of the electric energy meter with a communication module of the present invention is provided with a terminal for connecting an external antenna, and the module cover is provided with an opening for the terminal to pass through at a position corresponding to the terminal. In this way, when you need to install an external antenna, you can connect the external antenna to the connector in the opening without opening the module cover to realize the connection of the external antenna, making the connection of the external antenna more convenient and quick The whole structure is reasonable, and the time for external antenna connection is saved; a seal is provided between the module cover and the communication module outside the opening, and the module cover and the communication module form a sealed connection through the seal to prevent water, Dust and the like penetrate into the module cover through the inner edge of the opening and contact the communication module, which improves the service life of the communication module. By connecting a resistor between the external antenna and the ground, and by setting the DC voltage source and the AD sampling module, the AD sampling module detects the magnitude of the DC voltage between the external antenna module and the strobe switch and transmits it to the processor Module, the processing module determines whether the external antenna module is connected to the circuit according to the magnitude of the value, thereby automatically determining whether the meter uses an external antenna for data transmission and reception or a built-in antenna for data transmission and reception. This automatic switching function improves the information transmission efficiency of the meter.

Description of the drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention with an external antenna installed;

Figure 2 is a schematic diagram of the structure of Figure 1 with an external antenna removed;

Figure 3 is a cross-sectional view of Figure 1;

Fig. 4 is an enlarged schematic view of the structure of part A in Fig. 3;

Figure 5 is a cross-sectional view of Figure 1 from another angle;

Fig. 6 is a schematic diagram of an enlarged structure of part B in Fig. 5;

FIG. 7 is a schematic diagram of the three-dimensional exploded structure of FIG. 1;

FIG. 8 is a three-dimensional exploded schematic diagram of a partial structure of an embodiment of the present invention;

Fig. 9 is a three-dimensional exploded schematic diagram of a part of the structure in Fig. 8;

FIG. 10 is a schematic structural diagram from another angle of FIG. 9;

FIG. 11 is a perspective exploded schematic diagram of a part of the structure in FIG. 8 from another angle;

Figure 12 is a cross-sectional view from another angle of Figure 1;

FIG. 13 is a schematic diagram of a part of the structure of FIG. 1;

Figure 14 is a cross-sectional view of part of the structure in Figure 2;

15 is a schematic structural diagram of another external antenna installed with an embodiment of the present invention;

FIG. 16 is a structural block diagram of an electric meter capable of automatic switching between internal and external antennas according to the present application;

Fig. 17 is a schematic circuit diagram of an electric meter capable of automatic switching between internal and external antennas according to the present application.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

As shown in FIGS. 1 to 15, the electric energy meter with the communication module 2 according to the embodiment of the present invention includes a base 1, a communication module 2 provided on the base 1, a module cover 3 and a meter cover 7.

As shown in FIGS. 7 and 13, the above-mentioned communication module 2 is arranged at the upper end of the base 1, and the upper end of the rear wall 111 of the base 1 extends forward to form a support plate 13 for supporting the communication module 2, as shown in FIG. The table cover 7 is arranged on the base 1 and located below the module cover 3. As shown in Figures 4 and 5, the top plate 71 of the table cover 7 and the support plate 13 are opposed to each other, and the support plate 13, the top plate 71 of the table cover 7 and An accommodating cavity 1a for accommodating the module box 21 is formed between the rear wall 111 of the base 1. And the base 1 is covered with a module cover 3 at a position corresponding to the communication module 2, and the communication module 2 is located between the base 1 and the module cover 3. As shown in Fig. 4, the front part of the communication module 2 is provided with a connector 4 for connecting the external antenna 6. The external antenna 6 has two forms. For details, refer to Figs. 1 and 15. In addition, the lower end of the side of the module cover 3 facing the accommodating cavity 1a has a rib 35 extending in the circumferential direction. Correspondingly, the surface of the cover 7 facing the module cover 3 has a groove 711 for accommodating the rib 35. When the module cover 3 is in a state of covering the base 1, the rib 35 is limited in the groove 711, as shown in FIG. 5 for details. As shown in FIG. 1 and FIG. 7, the module cover 3 is provided with an opening 31 for avoiding the external antenna 6 at a position corresponding to the terminal 4, and the terminal 4 partially penetrates the opening 31. Specifically, as shown in FIGS. 8 to 10, the communication module 2 includes a module box 21 and a first circuit board 22 arranged in the module box 21. The front wall of the module box 21 is provided with a front end portion for the terminal 4 There are two through-holes 21a, the through-holes 21a are arranged side by side, the two through-holes 21a are arranged opposite to the opening 31, and the opening 31 is an oblate hole that avoids at least two external antennas 6. The rear end of the terminal 4 has a plug-in 41 that can be plugged into the first circuit board 22, as shown in FIG. 8 for details. The above-mentioned first circuit board 22 extends in the front-rear direction and is parallel to the top surface of the upper box cover 212, the plug-in 41 is L-shaped. When the communication module 2 is installed, the part of the terminal 4 adjacent to the front end is located in the first circuit. Above the board 22.

As shown in Figures 5 to 11, the above-mentioned module box 21 includes a lower box body 211 and an upper box cover 212 arranged on the lower box body 211. As shown in FIG. 6, the lower box body 211 and the upper box cover 212 A mounting cavity 21b for accommodating the first circuit board 22 is enclosed and formed, and the above-mentioned through hole 21a is opened on the front wall plate of the upper box cover 212, as shown in FIG. 9 for details. In addition, the upper box cover 212 and the lower box body 211 are connected by a snap structure. Specifically, as shown in FIGS. 8 to 11, at least three downwardly extending convex plates 213 are provided on the outer peripheral wall of the upper box cover 212. In this embodiment, there are four convex plates 213, and each convex plate 213 is provided with a button hole 2131. Correspondingly, the lower box body 211 is provided with a locking portion 2111 that can be inserted into the corresponding button hole 2131, The lower box body 211 is connected with the upper box cover 212 through the engagement of the snap-in portion 2111 and the corresponding buckle hole 2131, and the snap-in portion 2111 and the snap hole 2131 form the foregoing snap structure. In addition, as shown in FIG. 12, the inner side of the front wall plate of the upper box cover 212 has positioning ribs 2123 extending downward and arranged in pairs at intervals. The insert 41 is located between two adjacent positioning ribs 2123, so that the terminal 4 is prevented from moving left and right, and the strength of the front wall plate of the upper box cover is increased.

In addition, as shown in FIGS. 6 and 7, the rear plate of the upper box cover 212 of the module box 21 extends backwards with a limiting rib 2121, the limiting rib 2121 extends up and down, and there are at least two limiting ribs 2121 , And are arranged on the rear plate of the upper box cover 212 with left and right intervals. And when the module box 21 is in the installed state, the rear end surface of the limiting rib 2121 abuts against the rear wall 111 of the accommodating cavity 1a, as shown in FIG. 6 for details.

As shown in FIG. 5, a second circuit board 8 is provided in the space between the watch cover 7 and the base 1. The second circuit board 8 is connected to the first circuit board 22 through a connector 9. Specifically, the lower box body 211 The bottom wall of the watch cover is provided with an escape port 2112 for avoiding the connector 9. For details, as shown in FIG. 11, the top plate 71 of the watch cover 7 and the supporting plate 13 are formed with an aperture 72 for the connector 9 to pass through. , The connector 9 is connected to the second circuit board 7 after passing through the opening 211 and the mouth 62. Refer to FIG. 14 for details. Among them, the connector 9 is a pin header and one end of the connector 9 is connected to the first circuit board. The board 22 is connected, and the other end of the connector 9 is connected to the second circuit board 8. In this way, the first circuit board 22 is connected to the second circuit board 8 through the aforementioned connector 9.

In addition, as shown in Figures 3, 4 and 8, in the state where the module cover 3 is covered on the base 1, the module cover 3 and the communication module 2 form a sealed connection through a seal, which is located between the opening 31 outer. As shown in FIG. 8, the back of the module cover 3 has a first ring-shaped flange 32 and a second ring-shaped flange 33 that extend in the direction of the communication module 2 and are arranged at intervals from the inside to the outside. 32 is the inner peripheral wall of the opening 31 extending in the direction of the communication module 2, and when the module cover 3 is covered on the base 1, the rear wall surface of the first ring-shaped flange 32 and the front wall surface 20 of the module box of the communication module 2 Part of the conflict, see Fig. 4 for details; the above-mentioned seal is the sealing ring 5 arranged between the first annular flange 32 and the second annular flange 33 on the back of the module cover 3. The existence of the sealing ring 5, A sealed connection between the module cover 3 and the communication module 2 is realized, thereby preventing water, dust, etc. from infiltrating into the module cover 3 through the inner periphery of the opening 31 and contacting the electrical components in the communication module, thereby affecting the use of the electrical components life.

Figures 16 to 17 show the internal structure block diagram of the utility model that can automatically switch between the built-in antenna function and the external antenna function and the corresponding circuit schematic diagram. The electric meter includes a built-in antenna module 1a, an external antenna module 2a, a communication module 2 and a processing module 4a. It also includes a strobe switch 5a and a detection module 6a. The built-in antenna module 1a and the external antenna module 2a are connected to each other through the strobe switch 5a. The communication module 2 is connected, the output terminal of the processing module 4a is connected to the strobe switch 5a, and the detection module 6a is connected between the external antenna module 2a and the processing module 4a to detect the gap between the external antenna module 2a and the strobe switch 5a. DC voltage value, and transmit the detected DC voltage value to the processing module 4a, and the processing module 4a judges whether the external antenna module 2a is connected to the circuit according to the value, and then controls the gate switch to connect with the built-in antenna module or Connect with the external antenna module.

Specifically in this embodiment, the detection module 6a includes a DC voltage source 61a and an AD sampling module 62a. One end of the AD sampling module 62a is connected between the external antenna module 2a and the strobe switch 5a, and the other end is connected to the processing module 4a. The collected DC voltage value between the external antenna module 2a and the gate switch 5a is transmitted to the processing module 4a.

In order to accurately determine whether the external antenna is connected to the circuit, this application cleverly converts this problem into a measurement of the voltage value. This corresponds specifically to the circuit diagram. A resistor is integrated inside the external antenna, even if the external antenna is The antenna module 2a includes an external antenna 21a and a first resistor R1 with one end connected to the external antenna 21a and the other end grounded. The R1 is installed inside the external antenna and has a large resistance value that does not affect the impedance of the antenna in the working frequency band.

Whether the external antenna is connected or not determines whether there is a resistor connected in parallel to the working ground on the strobe switch used to connect the external antenna. In this application, the strobe switch 5a is a radio frequency switch. The radio frequency switch is used to realize automatic switching between internal and external antennas. That is, when it is determined that the external antenna is not connected to the circuit, the electric meter system uses the internal antenna by default. When the external antenna is connected to the circuit, the system preferentially selects the external antenna.

The AD sampling module 62a includes a second resistor R2 with one end connected to the DC voltage source 61a and the other end electrically connected to the one end of the first resistor R1. The AD sampling module can collect data between the first resistor R1 and the second resistor R2. To determine whether the external antenna is connected to the table, that is, the VCC of the DC voltage source 61a provides a DC bias voltage through the second resistor R2. If the external antenna is connected, R1 and R2 will form a split By judging the voltage value, it can be detected whether the external antenna is connected.

Specifically, when the external antenna is not installed, there is only the resistor R2 in the circuit. At this time, the value obtained by AD sampling is the value of the DC voltage source 61a, which is VCC, and the processing module 4a commands the RF switch directly with the built-in according to this value. The antenna module is turned on, and when the external antenna is installed, the first resistor R1 appears in the circuit. The value obtained by AD sampling is the value of VCC divided by R1/R2. At this time, the processing module 4 is based on the acquisition The DC voltage value on the radio frequency signal line, that is, according to the voltage value between the first resistor R1 and the second resistor R2, determines that the radio frequency switch is connected to the external antenna module, so that the external antenna is preferentially used for data exchange , So as to use the advantages of external antennas to improve data transmission efficiency.

In this application, the AD sampling module 62a also includes a first isolation module 63a for isolating the AC RF signal generated from the external antenna module 2a. One end of the first isolation module 63a is connected between the external antenna 21a and the first resistor R1 and the other One end is connected to the other end of the second resistor R2. Specifically, the first isolation module is an inductor L1, and the inductor L1 can block the radio frequency signal, so that the radio frequency signal is not affected by the back-end AD sampling circuit , And does not affect the DC partial pressure of R1/R2.

The AD sampling module 62a also includes a second isolation module 64a for isolating AC signals. One end of the second isolation module 64a is connected to the other end of the second resistor R2 and the other end is connected to the input end of the processing module 4a. Specifically, The second isolation module is an RC low-pass filter, which includes a third resistor R3 and a second capacitor C2. One end of the third resistor R3 is connected to the other end of the second resistor R2 and the other end is connected to the input end of the processing module 4a, One end of the second capacitor C2 is connected between the third resistor R3 and the input end of the processing module 4a, and the other end is grounded.

In this application, the processing module controls the switching action of the radio frequency switch. If it is judged that the external antenna has been installed, the external antenna is strobed to work; if the external antenna is not judged to be connected, the internal antenna is strobed to work, so as to make full use of The advantages of the external antenna and the internal antenna improve the data transmission efficiency of the electric meter.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.

Claims

An electric energy meter with a communication module, comprising a base (1), a communication module (2) arranged on the base (1), a built-in antenna module (1a), an external antenna module (2a) and a processing module (4a), The base (1) is covered with a module cover (3) at a position corresponding to the communication module (2), and the communication module (2) is located between the base (1) and the module cover (3), and is characterized in that: The communication module (2) is provided with a terminal (4) for connecting the external antenna (6), and the module cover (3) is provided with a terminal (4) part corresponding to the terminal (4) Through the opening (31).
The electric energy meter according to claim 1, wherein the opening (31) is an oblate hole that avoids at least two external antennas (6).
The electric energy meter according to claim 2, characterized in that: when the module cover (3) is covered on the base (1), the module cover (3) and the communication module (2) are sealed The sealing element forms a sealed connection, and the sealing element is located outside the opening (31).
The electric energy meter according to claim 3, wherein the sealing element is a sealing ring (5) provided on the back of the module cover (3).
The electric energy meter according to claim 4, characterized in that: the back of the module cover (3) has first annular flanges extending in the direction of the communication module (2) and spaced from the inside to the outside. (32) and a second annular flange (33), the sealing ring (5) is located between the first annular flange (32) and the second annular flange (33).
The electric energy meter according to claim 5, characterized in that: the first annular flange (32) is formed by extending the inner peripheral wall of the opening (31) toward the communication module (2), and When the module cover (3) is covered on the base (1), the rear wall surface of the first annular flange (32) partially abuts the front wall surface (20) of the communication module (2).
The electric energy meter according to any one of claims 1 to 6, characterized in that: the communication module (2) comprises a module box (21) and a first circuit board ( 22), the module box (21) is provided with a perforation (21a) through which one end of the terminal (4) penetrates, and the perforation (21a) is arranged opposite to the opening (31), and the wiring The other end of the head (4) is provided with a plug-in unit (41) which can be plugged into the first circuit board (22).
The electric energy meter according to claim 7, characterized in that: the module box (21) is arranged at the upper end of the base (1), and the module box (21) includes a lower box body (211) and a cover arranged on The upper box cover (212) on the lower box body (211), the lower box body (211) and the upper box cover (212) are enclosed to form a mounting cavity for accommodating the first circuit board (22) (21b), and the perforation (21a) is opened on the front wall plate of the upper box cover (212).
The electric energy meter according to claim 8, characterized in that: the outer peripheral wall of the upper box cover (212) is provided with at least three downwardly extending convex plates (213), and the convex plate (213) is provided with The button hole (2131), correspondingly, the lower box body (211) is provided with a snap-in portion (2111) that can be snapped into the corresponding snap hole (2131), and the lower box body (211) passes through the snap-in portion ( 2111) is connected with the upper box cover (212) through cooperation with the button hole (2131).
The electric energy meter according to claim 8, characterized in that: the base (1) is provided with a meter cover (7), the meter cover (7) is located below the module cover (3), and the A second circuit board (8) is arranged in the space between the watch cover (7) and the base (1), and the bottom wall of the lower box body (211) is provided with an escape port (2112) for avoiding the connector (9) ), the first circuit board (22) is connected to the second circuit board (8) through a connector (9).
The electric energy meter according to claim 9, characterized in that: the upper end of the base (1) is formed with a supporting plate (13) extending forward, and the top plate (71) of the meter cover (7) and the supporting plate (13) ) Facing each other and forming a mouth (72) for the connector (9) to pass through between the two joint surfaces, and the support plate (13), the top plate (71) of the watch cover (7) and the base (1) An accommodating cavity (1a) for accommodating the module box (21) is formed between the rear wall plates (111) of ).
The electric energy meter according to claim 11, characterized in that: the rear panel of the module box (21) extends backwards with a finite rib (2121), and when the module box (21) is in the installed state, The rear end surface of the limiting rib (2121) abuts against the rear wall plate (111) of the accommodating cavity (1a).
The electric energy meter according to claim 12, characterized in that: the limiting rib (2121) extends up and down on the rear plate of the upper box cover (212), and the limiting rib (2121) is at least There are two, and they are arranged at intervals on the left and right.
The electric energy meter according to any one of claims 1 to 6, characterized in that it further comprises a strobe switch (5a) and a detection module (6a), the built-in antenna module (1a) and the external antenna module (2a) are respectively connected with the communication module (2) through the strobe switch (5a), and the output terminal of the processing module (4a) is connected with the strobe switch (5a);

The detection module (6a) is connected between the external antenna module (2a) and the processing module (4a) to detect the DC voltage value between the external antenna module (2a) and the strobe switch (5a), and the processing module ( 4a) According to the magnitude of the DC voltage value transmitted by the detection module (6a), the gate switch (5a) is controlled to be connected to the built-in antenna module (1a) or connected to the external antenna module (2a).
The electric energy meter according to claim 14, characterized in that: the detection module (6a) comprises a DC voltage source (61a) and an AD sampling module (62a), and one end of the AD sampling module (62a) is connected to an external antenna module ( 2a) and the strobe switch (5a) and the other end is connected to the processing module (4a), and the collected DC voltage value between the external antenna module (2a) and the strobe switch (5a) is transmitted to the processing module (4a).
The electric energy meter according to claim 15, characterized in that: the external antenna module (2a) comprises an external antenna (21a) and a first resistor (R1) connected to the external antenna (21a) at one end and grounded at the other end .
The electric energy meter according to claim 14, wherein the strobe switch (5a) is a radio frequency switch.
The electric meter according to claim 16, characterized in that: the AD sampling module (62a) comprises a second resistor whose one end is connected to the DC voltage source (61a) and the other end is electrically connected to the one end of the first resistor (R1) (R2), the AD sampling module (62a) collects the DC voltage value between the first resistor (R1) and the second resistor (R2).
The electric energy meter according to claim 18, characterized in that: the AD sampling module (62a) further comprises a first isolation module (63a) for isolating the AC RF signal generated from the external antenna module (2a), and the first isolation module (63a) One end of the isolation module (63a) is connected between the external antenna (2) and the first resistor (R1), and the other end is connected with the other end of the second resistor (R2).
The electric energy meter according to claim 18, characterized in that: the AD sampling module (62a) further comprises a second isolation module (64a) for isolating AC signals, and one end of the second isolation module (64a) is connected to a second resistor ( The other end of R2) is connected and the other end is connected to the input end of the processing module (4a).
The electric energy meter according to claim 20, characterized in that: the first isolation module (63a) is an inductor L; and the second isolation module (64a) is an RC low-pass filter.
The electric energy meter according to claim 21, wherein the RC low-pass filter includes a third resistor (R3) and a second capacitor (C2), and one end of the third resistor (R3) is connected to the second resistor (R2). The other end of the second capacitor (C2) is connected between the third resistor (R3) and the input end of the processing module (4a) and the other end is connected to the input end of the processing module (4a). Grounded.