CN202166490U

CN202166490U - Intelligent heat meter with RS485 communication

Info

Publication number: CN202166490U
Application number: CN201120169275XU
Authority: CN
Inventors: 张海俏
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-05-25
Filing date: 2011-05-25
Publication date: 2012-03-14
Anticipated expiration: 2021-05-25

Abstract

The utility model relates to an intelligent heat meter with RS485 communication, comprising a flow measuring instrument, an inlet temperature sensor, an outlet temperature sensor, a pressure transmitter and an intelligent heat integrating instrument, wherein the flow measuring instrument, the inlet temperature sensor, the outlet temperature sensor and the pressure transmitter are all connected with the intelligent heat integrating instrument. A one-chip microcomputer and calculating program are arranged in the intelligent heat meter, acquired flow, temperature and pressure signals are transited to heat flow and are correspondingly outputted, integrated circuits are adopted for the input and out circuits, no potentiometer is needed for adjusting, and a Chinese configuration mode is adopted for instrument arrangement and a work menu. The RS485 communication output is provided, MODBUS-RTU protocol is adopted, and convenience is provided for the intelligent heat meter to communicate with a host such as a PLC. With a remote data communication function, the intelligent heat meter is high in intelligentized degree and integration degree, complete in functions, and strong in versatility. Besides, the instrument arrangement and work menu operation are simple and convenient.

Description

A kind of intelligent calorimeter with the RS485 communication

Technical field

The utility model relates to a kind of intelligent calorimeter, and it is high particularly to relate to a kind of degree of intelligence, and systemic-function is complete, the intelligent calorimeter of the band RS485 communication of highly versatile.

Background technology

Current northern area at home generally adopts hot water heating; The heat metering, data acquisition, the charging problem that have hot water; Current a lot of place is still adopted by area and is charged; This charge method exists reasons such as temperature variation because of hot water, building structure to cause area to equate but the actual un-reasonable phenomenon that uses heat dissipation to differ greatly but charge and equate, domestic a lot of places require to adopt the heat by actual hot water to charge gradually, and there is following problem mostly in the intelligent calorimeter of current use:

1. intelligent, integrated degree is not high: a large amount of Displaying Meters that use at present adopt discrete component mostly, and signal input and output circuit adopts potentiometer to regulate, and the time is long, owing to cause influences such as potentiometer drifts, is prone to cause complete machine performance, precise decreasing.

2. function is incomplete: most of heat integrator instrument, have otherwise be not with temperature and pressure compensation, have otherwise be not with output circuit, seldom have a kind of with temperature and pressure compensation and output input circuit multiple functional integrating meter.

3, versatility is not strong: mostly can only supporting a kind of flow measurement instrument or device.

4, there is not the remote data communication function.

5, instrument setting, job menu are not easy to operate.

Chinese patent CN201413207 provides a kind of ultrasonic vortex street calorimeter; Include flow detector, flow heat integrating instrument; And the inlet temperature sensor and the outlet temperature sensor that join with the flow heat integrating instrument; Said flow detector is ultrasonic vortex shedding flow meter; In the control circuit of said ultrasonic vortex shedding flow meter and in the said flow heat integrating instrument, be respectively equipped with communication module, join through data bus between the communication module of the two, said ultrasonic vortex shedding flow meter detects data according to communications protocol to said flow heat integrating instrument delivery flow rate; Its said flow instrument is ultrasonic vortex shedding flow meter, and the concrete function, the instrument that do not relate to heat integrating instrument are provided with job menu, RS485 communication output.

For this reason, develop that a kind of degree of intelligence is high, systemic-function is complete, highly versatile, intelligent heat integrating instrument user-friendly for operation, band RS485 communication output be in demand.

The utility model content

To the problems referred to above, the fundamental purpose of the utility model is to provide a kind of degree of intelligence high, and systemic-function is complete, the intelligent calorimeter of the band RS485 communication of highly versatile.

The utility model solves above-mentioned technical matters through following technical proposals: a kind of intelligent calorimeter with the RS485 communication; Comprise flow measurement instrument, inlet temperature sensor, outlet temperature sensor, pressure unit and intelligent heat integrating instrument, said flow measurement instrument, inlet temperature sensor, outlet temperature sensor, pressure unit all are connected with intelligent heat integrating instrument.

In the practical implementation example of the utility model, said flow measurement instrument is electromagnetic flowmeter, vortex shedding flow meter, turbo flow meter, ultrasonic flowmeter or differential pressure flowmeter.

In the practical implementation example of the utility model, said flow measurement instrument is only adorned one or respectively adorn one in inlet, exit in the porch of whole calorimeter.

In the practical implementation example of the utility model, said inlet temperature sensor and outlet temperature sensor with thermal resistance or (4-20) the mA current signal import intelligent heat integrating instrument.

In the practical implementation example of the utility model, its pressure signal of said pressure unit is imported intelligent heat integrating instrument with (4-20) mA current signal of correspondence.

In the practical implementation example of the utility model; Built-in single-chip microcomputer of said intelligent heat integrating instrument and calculation procedure; Convert flow, temperature, the pressure signal gathered to heat flow and corresponding RS485 communication output, adopt the MODBUS-RTU agreement, upper machine communications such as convenient and PLC.

In the practical implementation example of the utility model; Said intelligent heat integrating instrument comprises single-chip microcomputer, 220VAC power circuit, current input circuit, thermal resistance, thermopair input circuit, A/D conversion loop, keyboard loop, printer circuitry, RS485 circuit, (4～20) mA output circuit and LCD show circuit; Said current input circuit is changed with A/D and is connected on the single-chip microcomputer after the loop links to each other, and 220VAC power circuit, thermopair input circuit, keyboard loop, printer circuitry, RS485 circuit, (4～20) mA output circuit and LCD show circuit directly are connected on the single-chip microcomputer.

In the practical implementation example of the utility model, the model of said single-chip microcomputer is W78IE54P.

The positive progressive effect of the utility model is: the intelligent calorimeter of the band RS485 communication that the utility model provides has the following advantages: intelligent, the integrated degree of the utility model is high; Multiple functional; Highly versatile; Has the remote data communication function; Instrument is provided with, job menu is simple to operate.

Description of drawings

Fig. 1 is the intelligent calorimeter structured flowchart.

Fig. 2 is intelligent heat integrating instrument theory diagram.

Fig. 3 is (4～20) mA electric current input schematic diagram.

Fig. 4 is RS485 communication output principle figure.

Fig. 5 is band RS485 output loop intelligence heat integrating instrument multi computer communication theory diagram.

Embodiment

Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to specify the technical scheme of the utility model.

Fig. 1 is the structural representation of the utility model; As shown in Figure 1: the utility model comprises flow measurement instrument 1, inlet temperature sensor 2, outlet temperature sensor 3, pressure unit 4 and intelligent heat integrating instrument 5, and said flow measurement instrument 1, inlet temperature sensor 2, outlet temperature sensor 3, pressure unit 4 all are connected with intelligent heat integrating instrument 5.

Flow measurement instrument 1 can be electromagnetic flowmeter, vortex shedding flow meter, turbo flow meter, ultrasonic flowmeter or differential pressure flowmeter.

1 porch of flow measurement instrument at whole calorimeter adorn one or at inlet, the exit respectively adorns one.

Inlet temperature sensor 2 and outlet temperature sensor 3 with thermal resistance or (4-20) the mA current signal import intelligent heat integrating instrument 5.

Pressure unit 4 its pressure signals are imported intelligent heat integrating instrument with (4-20) mA current signal of correspondence.

Intelligence heat integrating instrument 5 built-in single-chip microcomputer and calculation procedures convert flow, temperature, the pressure signal gathered to heat flow and corresponding RS485 communication output, adopt the MODBUS-RTU agreement, upper machine communications such as convenient and PLC.

Intelligence heat integrating instrument 5 comprises single-chip microcomputer 15,220VAC power circuit 6, current input circuit 7, thermal resistance, thermopair input circuit 9, A/D conversion loop 8, keyboard loop 10, printer circuitry 11, RS485 circuit 12, (4～20) mA output circuit 13 and LCD show circuit 14; Said current input circuit 7 is changed with A/D and is connected on the single-chip microcomputer 15 after loop 8 links to each other, and 220VAC power circuit 6, thermopair input circuit 9, keyboard loop 10, printer circuitry 11, RS485 circuit 12, (4～20) mA output circuit 13 directly are connected on the single-chip microcomputer 15 with LCD show circuit 14.

Built-in single-chip microcomputer and calculation procedure convert flow, temperature, the pressure signal gathered to heat flow and corresponding output, and imput output circuit adopts integrated circuit; Need not potentiometer regulates; Instrument is provided with job menu and adopts Chinese configuration mode, and is succinct, convenient, band RS485 communication output; Adopt the MODBUS-RTU agreement; Upper machine communications such as convenient and PLC are connected to pull-up resistor at the signal input part of said communication chip U6, and are connected to current-limiting resistance, transition pipe respectively at its two signal output part.

In the concrete examples of implementation of the utility model, the model of single-chip microcomputer 15 can be elected W78IE54P as.

Fig. 2 is intelligent heat integrating instrument theory diagram, and " 220VAC power circuit 6 " be transformed to the 220VAC power rectifier+and the 5V power supply send and makes the single-chip microcomputer working power.

Simulation, digital signal that " current input circuit 7 ", " thermal resistance, thermopair input circuit 3 " will be imported are delivered in the unit sheet machine." printer circuitry 11 ", " RS485 circuit 12 ", " (4～20) mA output circuit loop 13 " are signal output apparatus; " keyboard circuit 10 " is the software operation circuit; " LCD show circuit 14 " is heat LCD display circuit.

Fig. 3 is (4～20) mA electric current input schematic diagram.

(4～20) mA electric current becomes (1-5) V voltage signal through R5 (250 Ω, 0.1% precision resistance), delivers to U5, and U5 is 24 an A/D change-over circuit, its benchmark from accurate reference source U6+5.000VDC, deliver to single-chip microcomputer after the U5A/D conversion.

Fig. 4 is RS485 communication output electrical schematic diagram:

The U1 single-chip microcomputer is through UART mouth outputting communication signal, and 1 pin of communication chip U6/SN65176 connects pull-up resistor R1, and 6 pin connect pull-up resistor R3, and the other end of pull-up resistor R1 and R3 is connected three-terminal voltage-stabilizing pipe 78L05, drives to strengthen; 6 pin of communication chip U6/SN65176 are connected current-limiting resistance R5 and resistance R 6 respectively with 7 pin; The other end of resistance R 5 and resistance R 6 is respectively communication terminal B pin and A pin; It is exportable RS485 communication signal; The other end of resistance R 5 and resistance R 6 also is connected with transition pipe D1 and transition pipe D2 respectively, when with upper machine communication the time, static or other reason is bled off at the high voltage that A, B bipod produce fast; A, B bipod voltage are maintained+6V, effectively protect communication chip U6/SN65176 (

general communication chip

6,7 bipod voltage-to-grounds are 15V); Also be provided with build-out resistor R4 between 6 pin of communication chip U6/SN65176 and 7 pin, be generally 100 Ω-120 Ω in the practical application.During multi computer communication, a nearest intelligent heat integrating instrument and the J5 short circuit of an intelligent heat integrating instrument farthest make A, B bipod equivalent resistance be about 60 Ω.A twisted-pair feeder carries out data transmission with regard to 32 vortex shedding flow meters of ability parallel connection and upper machine communication in the practical application, and extremely easy to use, communication is reliable, and damaging does not appear in communication chip U6.

The intelligence heat integrating instrument adopts the RS485 communication of MODBUS-RTU agreement, upper machine communications such as convenience and PLC.

Fig. 5 is band RS485 output loop intelligence heat integrating instrument multi computer communication theory diagram.Be connected on subscriber computer or the PLC etc. after many heat integrating instrument parallel connections.

Intelligent, the integrated degree of the utility model is high; Multiple functional; Highly versatile; Has the remote data communication function; Instrument is provided with, job menu is simple to operate.

More than show and described ultimate principle of the utility model and the advantage of principal character and the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described, under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications; These variations and improvement all fall in the utility model scope that requires protection, and the utility model requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. intelligent calorimeter with the RS485 communication; It is characterized in that: said calorimeter comprises flow measurement instrument, inlet temperature sensor, outlet temperature sensor, pressure unit and intelligent heat integrating instrument, and said flow measurement instrument, inlet temperature sensor, outlet temperature sensor, pressure unit all are connected with intelligent heat integrating instrument.

2. the intelligent calorimeter of band RS485 according to claim 1 communication, it is characterized in that: said flow measurement instrument is electromagnetic flowmeter, vortex shedding flow meter, turbo flow meter, ultrasonic flowmeter or differential pressure flowmeter.

3. the intelligent calorimeter of band according to claim 1 RS485 communication is characterized in that: said flow measurement instrument is only adorned one or respectively adorn one in inlet, exit in the porch of whole calorimeter.

4. the intelligent calorimeter of band RS485 according to claim 1 communication, it is characterized in that: said inlet temperature sensor and outlet temperature sensor are imported intelligent heat integrating instrument with thermal resistance or 4-20mA current signal.

5. the intelligent calorimeter of band RS485 according to claim 1 communication, it is characterized in that: its pressure signal of said pressure unit is imported intelligent heat integrating instrument with the 4-20mA current signal of correspondence.

6. the intelligent calorimeter of band RS485 according to claim 1 communication; It is characterized in that: the built-in single-chip microcomputer of said intelligent heat integrating instrument; Convert flow, temperature, the pressure signal gathered to heat flow and corresponding RS485 communication output; Adopt the MODBUS-RTU agreement, convenient and upper machine communication.

7. the intelligent calorimeter of band RS485 according to claim 1 communication; It is characterized in that: said intelligent heat integrating instrument comprises single-chip microcomputer, 220VAC power circuit, current input circuit, thermal resistance, thermopair input circuit, A/D conversion loop, keyboard loop, printer circuitry, RS485 circuit, 4～20mA output circuit and LCD show circuit; Said current input circuit is changed with A/D and is connected on the single-chip microcomputer after the loop links to each other, and 220VAC power circuit, thermopair input circuit, keyboard loop, printer circuitry, RS485 circuit, 4～20mA output circuit and LCD show circuit directly are connected on the single-chip microcomputer.

8. the intelligent calorimeter of band RS485 according to claim 1 communication, it is characterized in that: the model of said single-chip microcomputer is W78IE54P.