Split display communication system of intelligent electromagnetic and ultrasonic water meter and flowmeter

Abstract

The utility model discloses a split display communication system of an intelligent electromagnetic and ultrasonic water meter and a flowmeter, which comprises an integrated intelligent metering instrument, an AC220v main power supply, an independent display, a remote transmission module and a relay, and the AC220v main power supply supplies power to the independent display and the remote transmission module. The integrated intelligent metering instrument is in split connection with the independent display and the remote transmission module through an RS485 communication bus and a KM1 relay, that is, the independent display and the remote transmission module work in a time-sharing mode through the RS485 communication bus, and an MODBUS protocol is adopted. According to the utility model, the communication between a plurality of hosts and a single slave is realized, the problems that the length of a conventional split cable is not more than 10 meters and the split cable is too long to be easily interfered by the outside are solved, the RS485 communication distance can reach more than 1 KM, the protection area of the split structure is reduced, and the manufacturing cost of the split structure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent instrument communication, in particular to a split display communication system of an intelligent electromagnetic and ultrasonic water meter and a flow meter. Background Art

[0002] The measurement principles of electromagnetic meters and ultrasonic meters are respectively: Faraday electromagnetic induction and ultrasonic propagation time difference method (the time difference caused by the change in speed when the ultrasonic sound beam propagates downstream and upstream in water). The conventional split structure on the market is to extend the sensor (the part installed on the pipe) and the converter (the measurement display part) through the signal line to achieve the purpose of separation.

[0003] The conventional split cables of electromagnetic water meters and flow meters include: two electrode signal lines and shielding lines, two excitation coil signal lines, a total of 5 signal lines. Since these signals are extremely weak electrical signals, the requirements for signal lines are extremely high, and they are generally customized cables. In addition, the production cost of the split structure will increase sharply, and the split length of lithium battery-powered electromagnetic water meters or electromagnetic flow meters generally cannot exceed 10 meters.

[0004] Ultrasonic water meters and flow meters have more conventional split cables. The transducers of small-diameter ultrasonic water meters or flow meters are generally a pair, i.e., 2 transducers, while large-diameter ultrasonic meters generally require 4 to 6 pairs of transducers, i.e., 8 to 12 transducers, with 2 wires for each transducer. This means that ultrasonic water meters and flow meters have 4 to 24 wires in split cables from small-diameter to large-diameter, and the split length generally does not exceed 5 meters. The cost of the split structure is much different from that of the integrated structure.

[0005] Therefore, in order to correct the above defects, we propose a split display communication system for intelligent electromagnetic, ultrasonic water meters and flow meters. Utility Model Content

[0006] The utility model solves the technical problem of providing a split display communication system of an intelligent electromagnetic and ultrasonic water meter and a flow meter.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a split display communication system for intelligent electromagnetic, ultrasonic water meters and flow meters, comprising an integrated intelligent metering instrument, an AC220v main power supply, an independent display, a remote transmission module and a relay, wherein the AC220v main power supply supplies power for the independent display and the remote transmission module, and the integrated intelligent metering instrument is splitly connected to the independent display and the remote transmission module via an RS485 communication bus and a KM1 relay, that is, the independent display and the remote transmission module work in time-sharing manner via the RS485 communication bus, and adopt the MODBUS protocol.

[0008] Furthermore, the communication system also includes a 24v switching power supply and a 3.6v switching power supply. The 24v switching power supply is connected to an independent display, the 3.6v switching power supply is connected to a remote transmission module, and the 24v switching power supply and the 3.6v switching power supply are connected in parallel to an AC220v main power supply.

[0009] Furthermore, the communication system also includes a 24V relay, and two ports of the 24V relay are respectively connected to the independent display and the positive line between the 24V switching power supply and the independent display.

[0010] Furthermore, the RS485 connector of the RS485 communication bus adopts an IP68 waterproof connector.

[0011] Furthermore, the MODBUS protocol is one of the MODBUS RTU protocol and the MODBUS ASCII protocol.

[0012] Preferably, the MODBUS protocol is a MODBUS RTU protocol.

[0013] Preferably, the independent display is a text PLC all-in-one machine.

[0014] Preferably, the RS485 communication bus uses a two-core AB line.

[0015] Compared with the prior art, the beneficial effects of the utility model are: it solves the problem of communication between multiple hosts and a single slave, solves the problem that the length of conventional split cables does not exceed 10 meters and the split cables are too long and susceptible to external interference. The RS485 communication distance can reach more than 1KM, reducing the protection area of ​​the split structure, reducing the manufacturing cost of the split structure, and reducing the sealing structure at both ends of the sensor and the converter. In addition, conventional split cables have many signal lines and high conduction performance requirements, and high procurement costs. By replacing the RS485 communication line with a conventional split cable, only two-core AB lines are needed, and the procurement cost is sharply reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall circuit structure of the utility model;

[0017] Numbers in the figure:

[0018] 1. 3.6v switching power supply; 2. Remote transmission module; 3. Independent display; 4. 24v relay; 5. 24v switching power supply. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model provides a technical solution:

[0021] See also Figure 1 , a split display communication system for intelligent electromagnetic, ultrasonic water meters and flow meters, comprising an integrated intelligent metering instrument, an AC220v main power supply, an independent display 3, a remote transmission module 2, a relay 4, a 24v switching power supply 5, a 3.6v switching power supply 1 and a 24v relay 4, wherein the independent display 3, the remote transmission module 2, the relay 4, the 24v switching power supply 5, the 3.6v switching power supply 1 and the 24v relay 4 are in a circuit board box, the integrated intelligent metering instrument is an intelligent electromagnetic water meter, an ultrasonic water meter and a flow meter in an integrated structure, through the RS485 communication interface, the independent display or the remote transmission module is split and connected, the independent display can select a text PLC integrated machine, the remote transmission module and the independent display are time-sharing through the RS485 bus, as follows:

[0022] The RS485 interface of the integrated intelligent metering instrument is connected to the two-core AB line (RS485 communication bus). The A line and the B line are separately connected to the AB wiring port of the independent display 3 and the AB wiring port of the remote transmission module 2 through the KM1 relay, that is, the independent display 3 and the remote transmission module 2 work in time-sharing mode through the RS485 communication bus, and adopt the MODBUS protocol. The 24v switching power supply 5 and the 3.6v switching power supply 1 are connected in parallel to the 220v main power supply. The 24v switching power supply 5 converts AC220V to DC24V, and the 3.6v switching power supply 1 is connected in parallel to the 220v main power supply. The power supply 1 converts AC220V into DC3.6V, the positive and negative poles of the 24v switching power supply 5 are connected to the independent display 3 respectively, the positive and negative poles of the 3.6v switching power supply 1 are connected to the remote transmission module 2 respectively, the two ports of the 24v relay 4 are respectively connected to the Y output port of the independent display 3 and the positive line between the 24v switching power supply 5 and the independent display 3, and the CO output port of the independent display 3 and the line connection of the 24v relay 4 to the positive line between the 24v switching power supply 5 and the independent display 3 are connected as the output common terminal.

[0023] Wherein, the RS485 connector of the RS485 communication bus adopts an IP68 waterproof connector, the MODBUS protocol is one of the MODBUS RTU protocol or the MODBUS ASC II protocol, preferably the MODBUS RTU protocol, the MODBUS protocol is a master-slave point-to-point communication protocol, allowing data communication between a host and multiple slaves, in the communication system, the host is a microcomputer (PC, industrial computer, PLC), and the slave is an electromagnetic, ultrasonic water meter or flow meter. In this decentralized communication system, the system is allowed to connect up to 128 instruments and a communication distance of 1.2km. The communication method adopts a host request and a slave response. That is: the host makes a command request, and the slave responds to the received data for data analysis. If the data meets the communication protocol, the slave responds with data.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A split display communication system for intelligent electromagnetic, ultrasonic water meters and flow meters, characterized by: The invention comprises an integrated intelligent metering instrument, an AC220v main power supply, an independent display (3), a remote transmission module (2) and a relay (4), wherein the AC220v main power supply supplies power to the independent display (3) and the remote transmission module (2), the integrated intelligent metering instrument is separately connected to the independent display (3) and the remote transmission module (2) via an RS485 communication bus and a KM1 relay, the independent display (3) and the remote transmission module (2) work in time-sharing manner via the RS485 communication bus, and adopt the MODBUS protocol.

2. According to claim 1, a split display communication system for intelligent electromagnetic and ultrasonic water meters and flow meters is characterized in that: The communication system further comprises a 24V switching power supply (5) and a 3.6V switching power supply (1); the 24V switching power supply (5) is connected to the independent display (3); the 3.6V switching power supply (1) is connected to the remote transmission module (2); and the 24V switching power supply (5) and the 3.6V switching power supply (1) are connected in parallel to an AC220V main power supply.

3. According to claim 2, a split display communication system for intelligent electromagnetic and ultrasonic water meters and flow meters is characterized in that: The communication system further comprises a 24V relay (4), two ports of which are respectively connected to the independent display (3) and the positive line between the 24V switching power supply (5) and the independent display (3).

4. According to claim 1, a split display communication system for intelligent electromagnetic and ultrasonic water meters and flow meters is characterized in that: The RS485 connector of the RS485 communication bus adopts an IP68 waterproof connector.

5. According to claim 1, a split display communication system for intelligent electromagnetic and ultrasonic water meters and flow meters is characterized in that: The MODBUS protocol is one of the MODBUS RTU protocol or the MODBUS ASCII protocol.

6. The split display communication system of intelligent electromagnetic and ultrasonic water meters and flow meters according to claim 5 is characterized in that: The MODBUS protocol is the MODBUS RTU protocol.

7. The split display communication system of intelligent electromagnetic and ultrasonic water meters and flow meters according to claim 1 is characterized in that: The independent display (3) is a text PLC all-in-one machine.

8. The split display communication system of intelligent electromagnetic and ultrasonic water meters and flow meters according to claim 1 is characterized in that: The RS485 communication bus uses a two-core AB line.

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