CN216309093U

CN216309093U - Electromagnetic water meter

Info

Publication number: CN216309093U
Application number: CN202123003556.0U
Authority: CN
Inventors: 刘奇; 徐磊; 张珊波; 孙晓恒
Original assignee: Ningbo Water Meter Group Co Ltd
Current assignee: Ningbo Water Meter Group Co Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-04-15
Anticipated expiration: 2031-12-02

Abstract

The utility model relates to an electromagnetic water meter, comprising: the power supply module comprises an internal power supply, an external power supply, a power supply switching module, a digital power supply module, an analog power supply module and an excitation power supply module, wherein the internal power supply and the external power supply are connected with the power supply switching module, and the digital power supply module, the analog power supply module and the excitation power supply module are connected with the power supply switching module. The technical scheme of the utility model is that the power supply is carried out by switching the internal power supply or the external power supply, thereby realizing the power supply requirement of carrying out intensive acquisition monitoring with various functions and a certain time period.

Description

Electromagnetic water meter

Technical Field

The utility model relates to the field of water meters, in particular to an electromagnetic water meter.

Background

The electromagnetic flow measurement technology is more and more widely applied, and along with the development of electronic technology, the requirement on an electromagnetic water meter is higher and higher. The electromagnetic water meter is more and more in the aspect of functional diversity, the electromagnetic water meter only has a measuring function, and also has the functions of wired communication, wireless communication, data reporting cloud and the like, and intensive collection monitoring can be implemented in a certain time period, so that the requirement on a power supply is higher. However, the power supply of the existing electromagnetic water meter cannot meet the power supply requirements of multiple functions and implementation of intensive acquisition monitoring in a certain time period, and the use of the electromagnetic water meter is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an electromagnetic water meter, wherein a power supply of the electromagnetic water meter has the characteristics of meeting the requirements of multiple functions and intensive acquisition and monitoring in a certain time period and the like, and has better applicability.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an electromagnetic water meter comprising: the power supply module comprises an internal power supply, an external power supply, a power supply switching module, a digital power supply module, an analog power supply module and an excitation power supply module, wherein the internal power supply and the external power supply are connected with the power supply switching module, and the digital power supply module, the analog power supply module and the excitation power supply module are connected with the power supply switching module.

Preferably, the electromagnetic water meter further comprises a signal detection and processing circuit module electrically connected with the power module, wherein the signal detection and processing circuit module processes the electrode signal and comprises preprocessing, alternating current coupling, pre-amplification and analog-to-digital conversion, the preprocessing is right for filtering noise of the electrode signal, the alternating current coupling is reduced for direct current polarization noise of the electrode signal, the pre-amplification is right for amplifying the electrode signal, and the analog-to-digital conversion is used for carrying out synchronous sampling processing on the amplified electrode signal.

Preferably, the electromagnetic water meter still include with the constant current source excitation circuit module that the power module electricity is connected, constant current source excitation circuit module includes DC-DC power, constant current source circuit, H bridge switch, excitation control, RC filter circuit and excitation coil, the DC-DC power will power module's voltage conversion is excitation voltage, constant current source circuit will excitation voltage converts exciting current into, exciting current passes through H bridge switch drive excitation coil, excitation control passes through RC filter circuit switches into H bridge switch, and control excitation coil's drive direction.

Preferably, the electromagnetic water meter further comprises an empty pipe excitation module electrically connected with the power module, the empty pipe excitation module comprises an excitation source, an analog switch and a signal electrode, and the excitation source is a voltage source or a current source and is transmitted to the signal electrode through the analog switch.

Preferably, the electromagnetic water meter further comprises an MCU unit module electrically connected to the power module.

Preferably, the electromagnetic water meter further comprises an empty pipe judgment module electrically connected with the power module, the empty pipe judgment module comprises an empty pipe processing circuit and an empty pipe signal acquisition judgment module, the empty pipe processing circuit is used for carrying out differential circuit processing on the electrode signals after amplification, meanwhile, the MCU module is used for carrying out synchronous sampling on the electrode signals, and the empty pipe signal acquisition judgment module is used for judging the state of the electromagnetic water meter through the output electrode signal amplitude.

Preferably, the electromagnetic water meter further comprises a communication module electrically connected with the power module, and the communication module is a wireless communication module or a wired communication module.

Preferably, the electromagnetic water meter further comprises a humidity acquisition module electrically connected with the power module, and the humidity acquisition module actively or passively acquires the ambient temperature and the humidity of the electromagnetic water meter.

Compared with the prior art, the utility model has the beneficial effects that:

according to the technical scheme, the electromagnetic water meter comprises a power supply module, an internal power supply, an external power supply, a power supply switching module, a digital power supply module, an analog power supply module and an excitation power supply module, wherein the internal power supply and the external power supply are connected with the power supply switching module; the voltage of the internal power supply is too low, and when the external power supply is connected, the external power supply supplies power. When the external power supply is not connected, the power is supplied by the internal power supply. The electromagnetic water meter can supply power by switching the internal power supply or the external power supply, so that the power supply requirements of multiple functions and implementation of intensive acquisition monitoring in a certain time period are met.

Drawings

Fig. 1 is a schematic diagram of a measurement circuit of an electromagnetic water meter converter in an embodiment of the utility model.

Fig. 2 is a diagram of a power module of the electromagnetic water meter according to the embodiment of the utility model.

Fig. 3 is a schematic diagram of a constant current source excitation circuit in the embodiment of the utility model.

Fig. 4 is a schematic diagram of a signal detection and processing circuit module according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of an empty tube excitation module according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of an empty pipe determining module according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a communication module according to an embodiment of the utility model.

FIG. 8 is a block diagram of an MCU unit according to an embodiment of the present invention.

1. A power supply module; 11. a built-in power supply; 12. an external power supply; 13. a power switching module; 14. a digital power supply module; 15. an analog power supply module; 16. an excitation power supply module; 2. the signal detection and processing circuit module; 21. pre-treating; 22. AC coupling; 23. pre-amplification; 24. performing analog-to-digital conversion; 3. an electrode signal; 4. a constant current source excitation circuit module; 41. a DC-DC power supply; 42. a constant current source circuit; 43. an H-bridge switch; 44. excitation control; 45. an RC filter circuit; 46. a field coil; 5. an empty pipe excitation module; 51. an excitation source; 52. an analog switch; 53. a signal electrode; 6. an MCU unit module; 61. MCU; 62. an external crystal oscillator; 63. a data storage unit; 64. a program download interface; 7. an empty pipe judgment module; 71. an empty pipe processing circuit; 72. collecting and judging an empty pipe signal; 8. a communication module; 9. temperature and humidity acquisition module.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the utility model is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

Referring to fig. 1-2, an embodiment of the present invention provides an electromagnetic water meter, including: the power supply module 1 comprises an internal power supply 11, an external power supply 12, a power supply switching module 13, a digital power supply module 14, an analog power supply module 15 and an excitation power supply module 16, wherein the internal power supply 11 and the external power supply 12 are connected with the power supply switching module 13, and the digital power supply module 14, the analog power supply module 15 and the excitation power supply module 16 are connected with the power supply switching module 13; when the voltage of the internal power supply 11 is sufficient and the external power supply 12 is connected, the external power supply 12 supplies power; the voltage of the built-in power supply 11 is too low, and when the external power supply 12 is connected, the external power supply 12 supplies power.

Power module 1 provides the electric energy for electromagnetic water meter entire system, constant current source excitation circuit module 4 provides a stable alternating magnetic field through exporting stable electric current, signal detection and processing circuit module 2 carry out filtering amplification with electrode signal 3 and handle, the rethread analog-to-digital conversion 24 reaches MCU unit module 6, empty pipe excitation module 5 is right electrode signal 3 stimulates and carries out the empty pipe through synchronous sampling again and judges, exports corresponding result, and the electromagnetic water meter passes through pressure acquisition module and 9 collection facilities's of humiture acquisition module relevant parameter, and passes through communication module 8 transmits to the customer end.

The power module 1 mainly comprises an internal power supply 11, an external power supply 12, a power switching module 13, a digital power supply module 14, an analog power supply module 15 and an excitation power supply module 16, wherein the internal power supply 11 can be a lithium battery or other energy sources, and the external power supply 12 can be an external battery pack or other commercial power or solar power sources. When only the built-in power supply 11 is available, the built-in power supply 11 supplies power to the electromagnetic water meter; when the voltage of the internal power supply 11 is too low or the internal power supply 11 is not available, the external power supply 12 can supply power; when the internal power supply 11 exists and the electric energy is sufficient, and the external power supply 12 exists at the same time, the external power supply 12 supplies power; when the electromagnetic water meter needs to observe data in a certain time period, intensive collection and frequent reporting are needed, and the requirement on power supply is high, so that the external power supply 12 can be configured and the external power supply 12 supplies power.

As shown in fig. 3, the constant current source excitation circuit module 4 includes a DC-DC power supply 41, a constant current source circuit 42, an H-bridge switch 43, an excitation control circuit 44, an RC filter circuit 45 and an excitation coil 46, a system power supply voltage is converted into a stable excitation voltage by the DC-DC power supply 41, the excitation voltage is provided to the constant current source circuit 42, the constant current source circuit 42 can output a stable excitation current by a parameter set by the constant current source circuit 42, the excitation current can drive the excitation coil 46 by passing through the H-bridge switch 43, and the excitation control circuit 44 passes through the RC filter circuit 45 and switches the H-bridge switch 43, thereby controlling the direction of the excitation coil 46.

As shown in fig. 4, the signal detection and processing circuit module 2 mainly includes a preprocessing 21, an ac coupling 22, a pre-amplifier 23, and an analog-to-digital converter 24. The original electrode signal 3 contains differential mode noise, common mode noise, series mode noise and the like, and also contains direct current polarization noise of an electrode, if the electrode signal 3 is directly amplified without being processed, the noise can be amplified at the same time, and the amplifier is saturated due to excessive noise, so that the electrode signal 3 needs to be preprocessed 21 to filter some differential mode noise and common mode noise, then the alternating current coupling 22 is carried out to reduce the influence of the direct current polarization noise of the electrode on a subsequent circuit, the electrode signal 3 is preprocessed 23 after being preprocessed 21 and the alternating current coupling 22 to realize the amplification of a flow signal, and the analog-to-digital conversion 24 carries out synchronous sampling processing on the amplified signal.

As shown in fig. 5, the empty pipe excitation module 5 includes an excitation source 51, an analog switch 52, and a signal electrode 53. The excitation source 51 may be a minute voltage source or a minute current source. To reduce the impact of the blank pipe excitation on the measurement signal, the excitation source 51 should be transmitted to the signal electrode 53 through two single-channel analog switches 52 during the non-sampling period.

As shown in fig. 6, the empty pipe judgment module 7 includes an empty pipe processing circuit 71 and an empty pipe signal acquisition judgment 72. The amplified signal is transmitted to the empty pipe processing circuit 71 to be processed by a differential circuit, and meanwhile, the MCU unit module 6 synchronously samples an empty pipe excitation signal, when the electromagnetic water meter is empty pipe and full pipe, the impedance of the signal electrode 3 is different, the amplitude of the electrode signal 3 output by exciting the electrode through the excitation source 51 is also different, and then the amplitude is compared with a set empty pipe value, so that whether the electromagnetic water meter is in an empty pipe state or a full pipe state is judged.

As shown in fig. 7, the communication module 8 may be a wireless communication module or a wired communication module, and the type of the communication module 8 may be changed according to the needs of the customer. Parameters such as flow, flow velocity, temperature, pressure, electric quantity and the like of the electromagnetic water meter can be regularly and actively uploaded to the client through wired or wireless communication, and the client can also issue an instruction to actively inquire the parameters of the water meter, so that the remote transmission and interaction functions of the electromagnetic water meter are realized.

The temperature and humidity acquisition module 9 comprises a temperature and humidity sensor chip U3, a resistor R9 and a resistor R10, wherein the 1 st foot mark SDA _ temp of the chip U3 is connected with the second end of the resistor R10, the 4 th foot mark SCL _ temp of the chip U3 is connected with the second end of the resistor R9, the 3 rd foot of the chip U3, the 7 th foot, the 8 th foot, the 9 th foot and the first foot of the capacitor C5 are grounded, the 5 th foot of the chip U3, the first end of the resistor R9, the first end of the resistor R10 and the second end of the capacitor C5 are connected with the power supply 3V _ temp, the environmental temperature and the humidity of the electromagnetic water meter can be acquired at regular time, or the environmental temperature and the humidity parameters of the electromagnetic water meter can be acquired by people as an active instruction.

As shown in fig. 8, the MCU unit module 6 includes an MCU61, an external crystal oscillator 62, a data storage unit 63, and a program downloading interface 64, wherein the external crystal oscillator 62, the data storage unit 63, and the program downloading interface 64 are all connected to the MCU 61.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. An electromagnetic water meter, comprising:

the power supply module (1) comprises an internal power supply (11), an external power supply (12), a power supply switching module (13), a digital power supply module (14), an analog power supply module (15) and an excitation power supply module (16), wherein the internal power supply (11) and the external power supply (12) are connected with the power supply switching module (13), and the digital power supply module (14), the analog power supply module (15) and the excitation power supply module (16) are connected with the power supply switching module (13).

2. The electromagnetic water meter according to claim 1, further comprising a signal detection and processing circuit module (2) electrically connected to said power supply module (1), said signal detection and processing circuit module (2) processing the electrode signal (3) and comprising a preprocessing (21), an ac coupling (22), a preamplifier (23) and an analog-to-digital conversion (24), said preprocessing (21) filtering noise from said electrode signal (3), said ac coupling (22) reducing dc polarization noise from said electrode signal (3), said preamplifier (23) amplifying said electrode signal (3), said analog-to-digital conversion (24) synchronously sampling said amplified electrode signal (3).

3. An electromagnetic water meter as claimed in claim 1, further comprising a constant current source excitation circuit module (4) electrically connected to said power supply module (1), the constant current source excitation circuit module (4) comprises a DC-DC power supply (41), a constant current source circuit (42), an H-bridge switch (43), an excitation control (44), an RC filter circuit (45) and an excitation coil (46), the DC-DC power supply (41) converts the voltage of the power supply module (1) into an excitation voltage, the constant current source circuit (42) converts the excitation voltage into an excitation current that drives the excitation coil (46) through the H-bridge switch (43), the excitation control (44) is switched to the H-bridge switch (43) by the RC filter circuit (45), and controls a driving direction of the excitation coil (46).

4. An electromagnetic water meter as claimed in claim 1, characterized in that said electromagnetic water meter further comprises an idle tube excitation module (5) electrically connected to said power supply module (1), said idle tube excitation module (5) comprising an excitation source (51), an analog switch (52) and a signal electrode (53), said excitation source (51) being a voltage source or a current source and being transmitted to said signal electrode (53) through said analog switch (52).

5. The electromagnetic water meter according to claim 2, further comprising an MCU unit module (6) electrically connected to said power module (1), said MCU unit module (6) comprising an MCU (61), an external crystal oscillator (62), a data storage unit (63), and a program download interface (64), said external crystal oscillator (62), said data storage unit (63), and said program download interface (64) being connected to said MCU (61).

6. The electromagnetic water meter according to claim 5, characterized in that the electromagnetic water meter further comprises an empty pipe judgment module (7) electrically connected to the power supply module (1), the empty pipe judgment module (7) comprises an empty pipe processing circuit (71) and an empty pipe signal acquisition judgment module (72), the empty pipe processing circuit (71) performs differential circuit processing on the amplified electrode signal (3), the MCU unit module (6) performs synchronous sampling on the electrode signal (3), and the empty pipe signal acquisition judgment module (72) judges the state of the electromagnetic water meter according to the output amplitude of the electrode signal (3).

7. An electromagnetic water meter as claimed in claim 1, characterized in that said electromagnetic water meter further comprises a communication module (8) electrically connected to said power module (1), said communication module (8) being a wireless communication module or a wired communication module.

8. The electromagnetic water meter according to claim 1, further comprising a temperature and humidity acquisition module (9) electrically connected to the power module (1), wherein the temperature and humidity acquisition module (9) actively or passively acquires the ambient temperature and humidity of the electromagnetic water meter.