SE545382C2

SE545382C2 - Electricity meter with a communication module

Info

Publication number: SE545382C2
Application number: SE2250337A
Authority: SE
Inventors: Feng Shan; Guoqing Lin; Jian Tang; Zhangbo Wei
Original assignee: Ningbo Sanxing Medical & Electric Co Ltd
Priority date: 2019-09-20
Filing date: 2020-05-09
Publication date: 2023-07-25
Also published as: WO2021051825A1; SE2250337A1

Abstract

An electricity meter with a communication module comprises a base (1) and a communication module (2) disposed on the base (1); a module cover (3) covers on the base (1) 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); the communication module (2) has a plurality of wire connectors (4) for connecting a plurality of external antennas (6); the module cover (3) has a hole (31) corresponding to the wire connector (4) for the wire connector (4) to pass through. It can realize the connection of the external antenna (6) without opening the module cover (3), and the sealed connection prolonging the service life of the communication module (2). The electricity meter comprises a gating switch (5a) and a detection module (6a); the internal antenna module (1a) and the external antenna module (2a) are respectively connected to the communication module (2) through the gating switch (5 a), an output end of the processing module (4a) is connected to the gating switch (5a); the detection module (6a) is connected between the external antenna module (2a) and the processing module (4a) to detect a Direct Current (DC) voltage value between the external antenna module (2a) and the gating switch (5a); the processing module (4a) controls the gating switch (5a) to be connected to the internal antenna module (1a) or the external antenna module (2a) according to the DC voltage value transmitted by the detection module (6a).

Description

Electricity Meter With A Communication Module Technical Field of the Invention id="p-1" id="p-1"

[0001] The present disclosure relates to the technical field of electricity meters, and in particular, to an electricity meter With a communication module.

Background of the Invention [0002] An electricity meter is a meter for metering electricity, and it is also called an electric meter, an energy meter and a kiloWatt-hour meter, Which refers to a meter for measuring various electrical quantities. At present, the electricity meter is more and more Widely used in industrial production and life due to its advantages of small size, high precision, good reliability, convenience in installation, and the like. [0003] At present, a communication module is usually disposed in the electricity meter. Specifically, an accommodating cavity for installing the communication module is disposed in the electricity meter. A module box is disposed outside the communication module. An opening for installing an antenna is formed in a Wall plate of the module box of the module, so as to facilitate subsequent installation of the antenna. For example, a Chinese Utility Model patent CN207067205U (patent NO.: CN20l720745380.0) titled "Single Phase Intelligent Electricity Meter", disclosed an electricity meter Which comprises a bottom box and a Printed Circuit Board Assembly (PCBA) and a Third Generation-Programmable Logic Controller (GS-PLC) communication module installed in the bottom box. A module box and an antenna installing component are disposed in the bottom box. The module box and the PCBA are connected integrally. A gap for installing the antenna component is formed in a position, corresponding to the module box, of a side Wall of the bottom box. The bottom box is arranged to install a General Packet Radio Service (GRPS) communication module. The antenna installing component is disposed to position an intemal antenna or position a connecting line of an extemal antenna connector. The above electricity meter realizes subsequent installation of an extemal antenna. HoWever, during long-terrn use, Water may enter the module box through the gap in the side Wall of the bottom box to cause the damage to an electrical element of the communication module, Which may lead to a failure of the communication of an electricity meter, affect meter reading, and shorten the service life of the electricity meter. In addition, during installation, the installation of the extemal antenna can only be implemented by opening a housing located at the module, Which increases the inconvenience in installation. _1_ id="p-4" id="p-4"

[0004] Therefore, the existing electricity meter needs to be further improved. SUMMARY [0005] A first technical problem to be solved by the present invention is to provide an electricity meter with a communication module, which can directly install or replace an extemal antenna without opening a module cover. id="p-6" id="p-6"

[0006] electricity meter capable of preventing water and dust from entering the interior of a A second technical problem to be solved by the present invention is to provide an communication module through the connection of an extemal antenna. id="p-7" id="p-7"

[0007] short antenna inside a module cover, and to provide an antenna connector exposed out of a meter.

A third technical problem to be solved by the present invention is to install a conventional At the connector, the antenna is directly welded with a PCB (Printed Circuit Board) of the module, reducing signal attenuation and interference and improving the signal intensity of the antenna. [0008] electricity meter which can automatically switch between an intemal antenna function and an A fourth technical problem to be solved by the present invention is to provide an extemal antenna function, improve the wireless information transmission efficiency of the electricity meter, and reduce the trouble of manual operation. [0009] comprises a base; a module cover; and a communication module, an intemal antenna module, an To solve the first technical problem, the electricity meter with a communication module extemal antenna module, and a processing module disposed on the base; characterized in that, the module cover covers on the base at a position corresponding to the communication module, and the communication module is located between the base and the module cover; the communication module has a plurality of wire connectors for connecting a plurality of extemal antennas, and the module cover has a hole corresponding to the wire connector for the wire connector to pass through. id="p-10" id="p-10"

[0010] Preferably, the hole is an oblate hole to avoid at least two extemal antennas. _2_ id="p-11" id="p-11"

[0011] To solve the second technical problem, preferably, when the module cover covers on the base, the module cover is sealed connected to the communication module through a sealing piece, and the sealing piece is located on the hole. id="p-12" id="p-12"

[0012] The sealing piece may be disposed inside the module cover, and is tightly attached to a front wall of the communication module after being assembled. Preferably, the sealing piece is a sealing ring disposed at the back of the module cover. id="p-13" id="p-13"

[0013] a first annular ﬂange and a second annular ﬂange disposed at interval at the back of the module In order to facilitate the installation of the sealing ring, preferably, the module cover has cover, extending towards the communication module; the sealing ring is located between the first annular ﬂange and the second annular ﬂange. id="p-14" id="p-14"

[0014] In order to further prevent water from penetrating through the edge of the hole to be in contact with the communication module, preferably, an inner peripheral wall of the hole extends towards the communication module to form the first annular ﬂange, when the module cover covers on the base, a rear surface of the first annular ﬂange resists against a front surface of the communication module. id="p-15" id="p-15"

[0015] disposed inside the module box, the module box has a plurality of through holes for one end of Preferably, the communication module comprises a module box and a first circuit board each wire connector to pass through, the through holes are located corresponding to the hole; the other end of each wire connector has an inserting piece capable of being inserted into the first circuit board. The formation of the through holes facilitates the connection of the wire connector and the first circuit board. id="p-16" id="p-16"

[0016] the module box is disposed on an upper portion of the base, and the module box comprises a lower In order to make the structure of the whole electricity meter more compact, preferably, box body and an upper box body covering the lower box body; a chamber for receiving the first circuit board is enclosed between the lower box body and the upper box body, and the through holes are located on a front wall of the upper box body. id="p-17" id="p-17"

[0017] preferably, the upper box body has at least three connecting plates protruding downward from an In order to facilitate the installation of the upper box body and the lower box body, edge of the upper box body, each connecting plate has a connecting hole; correspondingly, the lower box body has at least three inserting portions which can insert into the corresponding connecting hole, so as to make the lower box body to be connected to the upper box body. The snap-fitted connection of the upper box body and the lower box body is more convenient. id="p-18" id="p-18"

[0018] Preferably, a meter cover is disposed on the base, the meter cover is located below the _3_ module cover, and a second circuit board is disposed in a space between the meter cover and the base; the first circuit board is connected to the second circuit board through a connector, and the lower box body has an avoiding hole for receiving the connector at a bottom of the lower box body. The arrangement of the meter cover, the module cover, the first circuit board, and the second circuit board improves the structural compactness of the electricity meter and facilitates the connection of the first circuit board and the second circuit board. id="p-19" id="p-19"

[0019] There are many ways to form an accommodating cavity. Preferably, the base has a supporting plate extending forward from the an upper end of the base; the meter cover has a top plate spliced with the supporting plate face to face, and an opening for receiving the connector is formed between the top plate and the supporting plate; an accommodating cavity for mounting the module box is formed among the supporting plate, the top plate of the meter cover, and a rear wall of the base. id="p-20" id="p-20"

[0020] In order to prevent the module box from shaking in the accommodating cavity to generate a gap with the module cover, preferably, the module box has a plurality of limiting ribs extending backward from a rear plate of the module box; when the module box is mounted, a rear end of each limiting rib resists against the rear wall. The module box is prevented from shaking in the accommodating cavity, so as to prevent a gap from being generated between the module box and the module cover at the hole, thereby preventing water from penetrating through the hole to be in contact with the module box. In addition, the existence of the limiting ribs increases the strength of the module box. Preferably, the limiting ribs extend up and down and are disposed on a rear plate of the upper box body, at least two limiting ribs are disposed left and right at interval.

Preferably, the detection module comprises a DC voltage source and an Analog- to-Digital (AD) sampling module; one end of the AD sampling module is connected between the extemal antenna module and the gating switch, and the other end is connected to the processing _4_ module; the collected DC voltage Value between the external antenna module and the gating switch is transmitted to the processing module.

Preferably, the external antenna module comprises an extemal antenna, and a first resistor with one end connected to the extemal antenna and the other end grounded. šmqPreferably, the gating switch is a Radio Frequency (RF) switch.

Preferably, the AD sampling module comprises a second resistor with one end connected to the DC voltage source and the other end electrically connected to one end of the first resistor; the AD sampling module collects the DC voltage value between the first resistor and the second resistor.

Preferably, the AD sampling module further comprises a first isolation module for isolating an Altemating Current (AC) RF signal generated from the extemal antenna module; one end of the first isolation module is connected between the extemal antenna and the first resistor, and the other end is connected to the other end of the second resistor.

Preferably, the AD sampling module further comprises a second isolation module for isolating an AC signal; one end of the second isolation module is connected to the other end of the second resistor, and the other end is connected to an input end of the processing module.

Preferably, the first isolation module is an inductor L, and the second isolation module is a Resistance-Capacitance (RC) low pass filter.

Preferably, the RC low pass filter comprises 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; 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, in the electricity meter with a communication module of the present disclosure, the communication module has a plurality of wire connectors for connecting a plurality of extemal antennas. The module cover has a hole corresponding to the wire connector for the wire connector to pass through. In this way, when the extemal antenna needs to be installed, the extemal antenna can be connected to the wire connector in the hole to realize the connection of the extemal antenna without opening the module cover, therefore the connection of the extemal antenna is more convenient and faster, the whole structure is reasonable, and the time for connecting the extemal antenna is shortened. The sealing piece is disposed between the module cover and the communication module outside the hole. The sealed connection is formed between the module cover and the communication module by means of the sealing piece, thereby _5_ preventing the water, the dust, etc. from penetrating into the module cover to be in contact with the communication module through an inner edge of the hole, and prolonging the service life of the communication module. A resistor is connected between the extemal module and the ground, the DC voltage source and the AD sampling module are disposed, and the DC voltage value between the extemal antenna module and the gating switch is detected by the AD sampling module and is transmitted to the processing module, so that the processing module deterrnines whether the extemal antenna module is connected to the circuit according to the value, so as to automatically determine whether the electricity meter uses the extemal antenna to transmit and receive data or uses the intemal antenna to transmit and receive data. The automatic switching function improves the information transmission efficiency of the electricity meter.

BRIEF DESCRIPTION OF THE DRAWINGS antenna according to an embodiment of the present invention. _____FIG. 2 is a perspective view of FIG. 1 when the extemal antenna is removed. ' FIG. 3 is a sectional view of FIG. 1. ' FIG. 4 is an enlarged view of Part-A in FIG.

NFIG. 5 is a sectional view at another angle of FIG. ÃWFIG. 6 is an enlarged view of Part-B in FIG. 5. ' ___FIG. 7 is an exploded view of FIG. i a.. q :__FIG. 8 is an exploded view of part of the electricity meter according to the embodiment of the present invention. . 9 is an exploded view of part of the electricity meter in FIG. . 10 is a perspective view at another view of FIG. . 11 is an exploded view at another view of part of the electricity meter in FIG. . 12 is a sectional view of FIG. 1 from another angle. . 13 is a perspective view of part of the electricity meter in FIG. . 14 is a sectional view of part of the electricity meter in FIG. . 15 is a perspective view of the electricity meter installed with another extemal antenna according to the embodiment of the present invention. switching intemal and extemal antennas according to the embodiment of the present invention. _6_ 17 is a Circuit diagram of the electric meter capable of automatically switching intemal and extemal antennas according to the embodiment of in the present invention.

DESCRIPTION OF THE EMBODIMENTS The present disclosure will be further described in detail below with reference to accompanying drawings and embodiments. gåmFigs. 1-15 show an embodiment of the electricity meter of the present invention.

The electricity meter with a communication module 2 comprises a base 1, and a communication module 2, a module cover 3, and a meter cover 7 disposed on the base shown in Fig. 7 and Fig. 13, the communication module 2 is disposed at an upper end of the base 1. An upper end of a rear wall 111 of the base 1 extends forwards to form a supporting plate 13 for supporting the communication module 2. As shown in Fig. 1, the meter cover 7 is disposed on the base 1 and is located below the module cover 3. As shown in Fig. 4 and Fig. 5, the meter cover 7 has a top plate 71 spliced with the supporting plate 13 face to face, and an accommodating cavity 1a for mounting a module box 21 is formed among the supporting plate 13, the top plate 71 of the meter cover 7, and a rear wall 111 of the base 1. The module cover 3 covers on the base 1 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, a front part of the communication module 2 has a plurality of wire connectors 4 for connecting a plurality of extemal antennas 6. There are two forms of the extemal antenna 6, which are specifically shown in Fig. 1 and Fig. 15. In addition, a lower end of one surface, facing the accommodating cavity 1a, of the module cover 3 has a raised rib 35 extending in a circumferential direction thereof. Correspondingly, the surface, facing the module cover 3, of the meter cover 7 has a groove 711 for accommodating the raised rib 35. When the module cover 3 covers on the base 1, the raised rib 35 is limited in the groove 711, which is specifically shown in Fig. 5. As shown in Fig.1 and Fig.7, the module cover 3 has a hole 31 corresponding to the wire connector 4 for the wire connector 4 to pass through, and the wire connector 4 partly passes through the hole 31. Speciﬁcally, as shown in Figs. 8-10, the communication module 2 comprises a module box 21 and a first circuit board 22 disposed inside the module box 21, a front wall of the module box 21 has a plurality of through holes 21a for a front end of each wire connector 4 to pass through. There are two through holes 21a disposed side by side, the two through holes 21a are located corresponding to the hole 31, and the hole 31 is an oblate hole that avoids at least two extemal antennas 6. A rear end of each wire connector 4 has an inserting piece 41 that capable of being _7_ inserted into the first Circuit board 22, which is specifically shown in Fig. 8. The above first circuit board 22 extends in a front-back direction, and is parallel to a top surface of the upper box body 212. The inserting piece 41 is L-shaped. When the communication module 2 is installed, the part, adj acent to a front end, of the wire connector 4 is located above the first circuit board ° shown in Figs. 5-11, the above module box 21 comprises a lower box body 211 and an upper box body 212 covering the lower box body 211. As shown in Fig. 6, a chamber 21b for receiving the first circuit board 22 is enclosed between the lower box body 211 and the upper box body 212, and the through holes 21a are located on a front wall of the upper box body 212, specifically shown in Fig. 9. In addition, the upper box body 212 is connected to the lower box body 211 by means of snap-fitted structures. Specifically, as shown in Figs. 8-11, the upper box body 212 has at least three connecting plates 213 protruding downward from an edge of the upper box body 212. In the present embodiment, there are four connecting plates 213. Each connecting plate 213 has a connecting hole 2131; correspondingly, the lower box body 211 has at least three inserting portions 2111 which can insert into the corresponding connecting hole 2131, so as to make the lower box body 211 to be connected to the upper box body 212. The above inserting portions 2111 and the connecting holes 2131 form the described inserting structures. In addition, as shown in Fig. 12, a plurality of positioning ribs 2123 extending downwards and disposed in pairs left and right at interval are formed on an inner side of a front wall of the upper box body 212. When the upper box body covers the lower box body, the inserting piece 41 of the wire connector 4 is located between adjacent two positioning ribs 2123, thus, the wire connector 4 is prevented from moving left and right, and the strength of the front wall of the upper box body is increased. p, " addition, as shown in Fig.6 and Fig.7, the module box 21 has a plurality of limiting ribs 2121 extending backward from a rear plate of the upper box body 212 of the module box 21. The limiting ribs 2121 extend up and down and are disposed on a rear plate of the upper box body 212, at least two limiting ribs 2121 are disposed left and right at interval. When the module box 21 is mounted, a rear end of each limiting rib 2121 resists against the rear wall 111, specifically shown in Fig. ____As shown in Fig. 5, a second circuit board 8 is disposed in a space between the meter 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 has an avoiding hole 2112 for receiving the connector 9 at a bottom of the lower box body 211, specifically shown in Fig.

The top plate 71 of the meter cover 7 is spliced with the supporting plate 13 face to face, and an _g_ opening 72 for receiving the connector 9 is formed between the top plate 71 and the supporting plate l3, then the connector 9 is connected to the second circuit board 8 after passing through the avoiding hole 2l l2 and the opening 72, specifically shown in Fig. l4. The connector 9 is a pin header-female header. One end of the connector 9 is connected to the first circuit board 22, and the other end of the connector 9 is connected to the second circuit board 8. Thus, the first circuit board 22 is connected to the second circuit board 8 through the connector ä". »1//"Thus, as shown in Fig. 3, Fig. 4, and Fig. 8, when the module cover 3 covers on the base l, the module cover 3 is sealed connected to the communication module 2 through a sealing piece, and the sealing piece is located on the hole 3 l. As shown in Fig. 8, the module cover 3 has a first annular ﬂange 32 and a second annular ﬂange 33 disposed at interval at the back of the module cover 3, extending towards the communication module 2. An inner peripheral wall of the hole 3l extends towards the communication module 2 to form the first annular ﬂange 32, when the module cover 3 covers on the base l, a rear surface of the first annular ﬂange 32 resists against a front surface 20 of the module box of the communication module 2, specifically shown in Fig. 4. The above sealing piece is a sealing ring 5 disposed between the first annular ﬂange 32 and the second annular ﬂange 33 at the back of the module cover 3. The existence of the sealing ring 5 realizes the sealed connection between the module cover 3 and the communication module 2, so as to prevent water, dust, etc. from penetrating into the module cover 3 to be in contact with an electrical element in the communication module through an inner edge of the hole 3l, thereby affecting the service life of the electrical element. ~\ šaïšš *äs l6-l7 show a schematic diagram and a corresponding circuit diagram of an electricity meter capable of automatically switching between an internal antenna function and an external antenna function of the present invention. The electricity meter comprises an intemal antenna module la, an external antenna module 2a, a communication module 2, and a processing module 4a, and further comprises a gating switch 5a and a detection module 6a. The intemal antenna module la and the external antenna module 2a are respectively connected to the communication module 2 through the gating switch 5a, an output end of the processing module 4a is connected to the gating switch 5a; the detection module 6a is connected between the extemal antenna module 2a and the processing module 4a to detect a Direct Current (DC) voltage value between the external antenna module 2a and the gating switch 5a, and transmit the detected DC voltage value to the processing module 4a. The processing module 4a deterrnines whether the extemal antenna module 2a is connected to a circuit according to the value, and then controls the gating switch to be connected to the internal antenna module or the external antenna module. _9_ §_T_§_____Speciﬁc to the present embodiment, the detection module 6a comprises a DC voltage source 6la and an Analog-to-Digital (AD) sampling module 62a; one end of the AD sampling module 62a is connected between the extemal antenna module 2a and the gating switch 5a, and the other end is connected to the processing module 4a; the collected DC voltage value between the extemal antenna module 2a and the gating switch 5a is transmitted to the processing module 4a.

"In order to accurately determine whether the extemal antenna is connected to the circuit, the present application skillfully converts this problem into the measurement of a voltage value, which specif1cally corresponds to integrating a resistor inside the extemal antenna in a circuit diagram, that is, the extemal antenna module 2a comprises an extemal antenna 2al, and a first resistor Rl with one end connected to the extemal antenna 2al and the other end grounded. The Rl is installed inside the extemal antenna. The resistance value is very large, which does not affect the impedance of the antenna in a working frequency band. "'¿f_§____ connected to the circuit, the system gives priority to using the extemal antenna.

The AD sampling module 62a comprises a second resistor R2 with one end connected to the DC voltage source 6la and the other end electrically connected to one end of the first resistor Rl. The AD sampling module can determine whether the extemal antenna is connected to the meter or not by collecting the DC voltage value between the first resistor Rl and the second resistor R2, that is, VCC of the DC voltage source 6la provides a DC bias voltage through the second resistor R2. If the extemal antenna is connected, voltage will be divided by the Rl and the R2, and whether the extemal antenna is connected or not may be detected by deterrnining a voltage value.

Specif1cally, when an extemal antenna is not installed, there is only the resistor R2 in the circuit. At this moment, the value obtained by AD sampling is the value of the DC voltage source 6la, that is VCC, and then the processing module 4a commands the RF switch to directly connect the intemal antenna module according to the value. After the extemal antenna is mounted, the first resistor Rl appears in the circuit, the value obtained by the AD sampling is the value of _10_ the VCC after Rl/R2 Voltage division. At this moment, the processing module 4a deterrnines that the RF switch is connected to the external antenna module according to the obtained DC voltage value on an RF signal line, that is, according to the voltage value between the first resistor Rl and the second resistor R2, so as to switch to give the priority to using the external antenna for data exchange, thereby improving the data transmission efficiency by using the advantages of the extemal antenna.

' MIn the present application, the AD sampling module 62a further comprises a first isolation module 63a for isolating an Altemating Current (AC) RF signal generated from the extemal antenna module 2a; one end of the first isolation module 63a is connected between the extemal antenna 2al and the first resistor Rl, and the other end is connected to the other end of the second resistor R2. Specifically, the first isolation module is an inductor Ll. The inductor L1 can achieve an effect of blocking the RF signal, so that the RF signal is not affected by the AD sampling circuit at a rear end, and meanwhile, DC voltage division of the Rl/R2 is not affected.

The AD sampling module 62a further comprises a second isolation module 64a for isolating an AC signal; 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 an input end of the processing module 4a. Specifically, the second isolation module is an RC low pass filter, which comprises 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.

According to the present application, a switching action of the RF switch is controlled by the processing module. If it is deterrnined that the extemal antenna has been installed, the extemal antenna is gated to work. If it is not deterrnined that the extemal antenna is connected, the intemal antenna is gated to work, so that respective advantages of the extemal antenna and the intemal antenna are fully utilized, which improves the data transmission efficiency of the electricity meter.

The protection scope of the present invention is not limited to each embodiments described in this description. Any changes and replacements made on the basis of the scope of the present invention patent and of the description shall be included in the scope of the present invention patent.

Claims

1. An electricity meter with a communication module, comprising: a base (1); a communication module (2), an intemal antenna module (la), an extemal antenna module 5 (2a), and a processing module (4a) disposed on the base (1); characterized in that, a module cover (3) covers on the base (1) 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); 10 the communication module (2) has a plurality of wire connectors (4) for connecting a plurality of extemal antennas (6), and the module cover (3) has a hole (31) corresponding to the wire connector (4) for the wire connector (4) to pass through.. va»

2. The electricity meter according to claim 1, characterized in that the hole (31) is an oblate hole to avoid at least two extemal antennas (6).

3. The electricity meter according to claim 2, characterized in that when the module cover (3) covers on the base (1), the module cover (3) is sealed connected to the communication module (2) through a sealing piece, and the sealing piece is located on the hole (31).

4. The electricity meter according to claim 3, characterized in that the sealing piece is a sealing ring (5) disposed at the back of the module cover (3).

5. The electricity meter according to claim 4, characterized in that the module cover (3) has a first annular ﬂange (32) and a second annular ﬂange (33) disposed at interval at the back of the module cover (3), extending towards the communication module (2); the sealing ring (5) is located between the first annular ﬂange (32) and the second annular ﬂange (33).

6. The electricity meter according to claim 5, characterized in that an inner peripheral wall of the hole (31) extends towards the communication module (2) to forrn the first annular ﬂange (32), when the module cover (3) covers on the base (1), a rear surface of the first annular ﬂange (32) resists against a front surface (20) of the communication module (2).

7. The electricity meter according to anyone of claims 1-6, characterized in that the communication module (2) comprises a module box (21) and a first circuit board (22) disposed inside the module box (21), the module box (21) has a plurality of through holes (21a) for one end of each wire connector (4) to pass through, the through holes (21a) are located corresponding to the hole (31); the other end of each wire connector (4) has an inserting piece (41) capable of being inserted into the first circuit board (22).

8. The electricity meter according to claim 7, characterized in that the module box (21) is disposed on an upper portion of the base (1), and the module box (21) comprises a lower box body (211) and an upper box body (212) covering the lower box body (211); a chamber (21b) for receiving the first circuit board (22) is enclosed between the lower box body (211) and the upper box body (212), and the through holes (21a) are located on a front wall of the upper box body (212).

9. The electricity meter according to claim 8, characterized in that the upper box body (212) has at least three connecting plates (213) protruding downward from an edge of the upper box body (212), each connecting plate (213) has a connecting hole (2131); correspondingly, the lower box body (211) has at least three inserting portions (2111) which can insert into the corresponding connecting hole (2131), so as to make the lower box body (211) to be connected to the upper box body (212).

10. The electricity meter according to claim 8, characterized in that a meter cover (7) is disposed on the base (1), the meter cover (7) is located below the module cover (3), and a second circuit board (8) is disposed in a space between the meter cover (7) and the base (1); the first circuit board (22) is connected to the second circuit board (8) through a connector (9), and the lower box body (211) has an avoiding hole (2112) for receiving the connector (9) at a bottom of the lower box body (211).

11. The electricity meter according to claim characterized in that the base (1) has a supporting plate (13) extending forward from the an upper end of the base (l); _2_ the meter cover (7) has a top plate (71) spliced with the supporting plate (13) face to face, and an opening (72) for receiving the connector (9) is forrned between the top plate (71) and the supporting plate (13); an accommodating caVity (la) for mounting the module box (21) is forrned among the supporting plate (13), the top plate (71) of the meter cover (7), and a rear wall (111) of the base (1).

12. The electricity meter according to claim 11, characterized in that the module box (21) has a plurality of limiting ribs (2121) extending backward from a rear plate of the module box (21); when the module box (21) is mounted, a rear end of each limiting rib (2121) resists against the rear wall (111).

13. The electricity meter according to claim 12, characterized in that the limiting ribs (2121) extend up and down and are disposed on a rear plate of the upper box body (212), at least two limiting ribs (2121) are disposed left and right at interVal. . The electricity meter according to claim l-fi, characterized in that the detection module (6a) comprises a DC Voltage source (61a) and an Analog-to-Digital (AD) sampling module (62a); one end of the AD sampling module (62a) is connected between the extemal antenna module (2a) and the gating switch (5 a), and the other end is connected to the processing module (4a); the collected DC Voltage Value between the extemal antenna module (2a) and the gating switch (5 a) is transmitted to the processing module (4a). The electricity meter according to claim lfšš-š, characterized in that the extemal antenna module (2a) comprises an extemal antenna (2a1), and a first resistor (R1) with one end connected to the extemal antenna (2a1) and the other end grounded. _3_ The electricity meter according to claim l-“š~, characterized in that the gating switch (5 a) is a Radio Frequency switch. The electricity meter according to claim characterized in that the AD sampling module (62a) comprises a second resistor (R2) with one end connected to the DC Voltage source (6la) and the other end electrically connected to one end of the first resistor (Rl); the AD sampling module (62a) collects the DC Voltage Value between the first resistor (Rl) and the second resistor (R2), The electricity meter according to claim characterized in that the AD sampling module (62a) further comprises a first isolation module (63a) for isolating an Altemating Current (AC) RF signal generated from the extemal antenna module (2a); one end of the first isolation module (63a) is connected between the extemal antenna (2al) and the first resistor (Rl), and the other end is connected to the other end of the second resistor (R2). ,_ s. The electricity meter according to claim 18, characterized in that the AD sampling module (62a) further comprises a second isolation module (64a) for isolating an AC signal; 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 an input end of the processing module (4a). The electricity meter according to claim ~, characterized in that the first isolation module (63a) is an inductor L, and the second isolation module (64a) is a Resistance-Capacitance (RC) low pass ﬁlter. The electricity meter according to claim characterized in that the RC low pass filter comprises a third resistor (RS) 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.