Data conversion device and steam supply data transmission system

Abstract

The utility model belongs to the field of power plant production equipment, and particularly relates to a data conversion device for communicating heat supply data to a DCS (Distributed Control System) and a steam supply data transmission system. Comprising a shell and wiring ports distributed on the shell, and at least one RS485 signal conversion module is arranged in the shell and used for converting received signals; and the at least one first photoelectric conversion module is used for converting the RS485 signal into an optical signal. Technicians in the field can simply acquire and remotely transmit data of the local transmitter according to the technical scheme, or can directly adopt an intelligent instrument with an RS485 conversion interface, a first photoelectric conversion module is connected to the RS485 interface, and the intelligent instrument can remotely transmit local parameters to a DCS host end through an optical fiber while displaying the local parameters, so that data synchronization is realized, and the data transmission efficiency is improved. The method can effectively solve the problems that deviation exists between data of the DCS and data of the intelligent instrument and inconvenience is brought to follow-up flow cost settlement due to different calculation periods of the intelligent instrument and the DCS, transmission errors of lines and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of power plant production equipment, concretely relates to a data conversion device for communicating heat supply data to DCS and steam supply data transmission system. BACKGROUND

[0002] At present, many thermal power units are reformed for steam supply, namely, steam supply and power generation at the same time. The steam supply part will be settled according to the accumulated steam supply. The calculation of the accumulated flow generally adopts two ways, the first way is to select intelligent instruments on site, connect temperature, transmitter differential pressure, pressure and other parameters into the intelligent instruments, and the intelligent instruments calculate to obtain instantaneous flow, accumulated flow and other parameters according to the formula. This method needs people to copy parameters on site, and the workload is large. The second way is to use isolation grids to divide the parameters into two parts, one is connected into the intelligent instrument, and the other is connected into the DCS. The DCS calculates to obtain instantaneous flow, accumulated flow and other parameters according to the formula. This method realizes remote monitoring of parameters, but due to the different calculation periods of the intelligent instrument and the DCS, transmission errors of the line and other reasons, there is deviation between the data of the DCS and the data of the intelligent instrument, which brings trouble for subsequent flow cost settlement. CONTENT OF THE UTILITY MODEL

[0003] Technical problem: due to the different calculation periods of the intelligent instrument and the DCS, transmission errors of the line and other reasons, there is deviation between the data of the DCS and the data of the intelligent instrument, which brings inconvenience for subsequent flow cost settlement.

[0004] Technical scheme: a data conversion device, comprising a shell and a wiring port distributed on the shell, characterized in that the shell comprises at least one RS485 signal conversion module for converting the received signal;

[0005] At least one first photoelectric conversion module is connected with the RS485 signal conversion module and used for converting the RS485 signal into an optical signal. The local transmitter data can be simply collected and transmitted by the technical personnel in the field according to the technical scheme. The intelligent instrument with the RS485 conversion interface can also be directly used, the first photoelectric conversion module is connected on the RS485 interface, the local parameters can be displayed on the intelligent instrument, the local parameters can be transmitted to the DCS host end through the optical fiber at the same time, the data synchronization is realized, the different calculation periods of the intelligent instrument and the DCS, transmission errors of the line and other reasons can be effectively solved, there is deviation between the data of the DCS and the data of the intelligent instrument, which brings inconvenience for subsequent flow cost settlement.

[0006] Further, the device further comprises an ADC analog signal conversion module, the ADC analog signal conversion module is used for converting the received analog signal into a digital signal, and an output end of the ADC analog signal conversion module is connected with an input end of the RS485 signal conversion module.

[0007] Further, the device further comprises an RS485 bus output module, an input end of the RS485 bus output module receives an output signal of an RS-485 driving chip in the RS485 signal conversion module, and an output end of the RS485 bus output module is connected with the photoelectric conversion module.

[0008] Further, the input end of the RS485 signal conversion module and the ADC analog signal conversion module and the output end of the first photoelectric conversion module are connected with the wiring port.

[0009] Further, the device further comprises a display screen, the display screen is used for displaying local parameters or running states, and if the intelligent instrument is adopted, the intelligent instrument itself is provided with a digital display module.

[0010] The application further provides a steam supply data transmission system, comprising the data conversion device, and the input end of the RS485 signal conversion module and / or the ADC analog signal conversion module is connected with one or more of a differential pressure transmitter, a pressure transmitter and a thermistor.

[0011] The first photoelectric conversion module is connected with the second photoelectric conversion module of the data receiving end.

[0012] The second photoelectric conversion module is connected with the DCS host.

[0013] Further, the system further comprises an LC card, an input end of the LC card is connected with an output end of the second photoelectric conversion module, and an output end of the LC card is connected with the DCS host.

[0014] The signal received by the second photoelectric conversion module is converted into a 485 signal, the 485 signal is communicated to the DCS through the LC card, after the LC card is configured and set on the DCS side, the pressure, the temperature, the instantaneous flow, the cumulative flow and the like of the intelligent instrument are displayed in real time, and the real-time consistency with the local parameters can be ensured.

[0015] The application has the following beneficial effects:

[0016] Data synchronization: through the conversion of the RS485 signal and the optical signal, the data synchronization between the intelligent instrument and the DCS is realized, and the data deviation caused by different calculation periods and transmission errors is avoided.

[0017] Efficient transmission: the optical fiber transmission is adopted to reduce electromagnetic interference and improve the stability and accuracy of data transmission.

[0018] Flexible connection: supports multiple sensor types (differential pressure, pressure, thermistor, etc.), adapts to different industrial application requirements.

[0019] Enhanced reliability: through the combination of photoelectric conversion and RS485 bus, the anti-interference ability of the system is improved, ensuring data integrity.

[0020] Real-time monitoring: through LC card configuration on the DCS side, real-time display of pressure, temperature, flow and other parameters is realized, ensuring that the data is consistent with the local parameters.

[0021] Simplify settlement: reduce the inconvenience of settlement caused by data deviation, improve the accuracy of flow cost settlement.

[0022] Strong scalability: modular design facilitates system expansion and upgrade, meeting future demand changes. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The schematic diagram of the first embodiment of the present application is shown in the figure.

[0024] Figure 2 The schematic diagram of the second embodiment of the present application is shown in the figure.

[0025] In the figure: 1, differential pressure transmitter; 2, thermistor; 3, pressure transmitter; 4, intelligent instrument; 5, 485 photoelectric converter; 6, LC card; 7, shell; 8, display screen; 9, RS485 signal conversion module; 10, first photoelectric conversion module; 11, ADC analog signal conversion module; 12, RS485 bus output module; 13, second photoelectric conversion module. DETAILED DESCRIPTION Embodiment one

[0026] A system for communicating heating data to DCS, characterized by comprising: differential pressure transmitter 1, thermistor 2, pressure transmitter 3, intelligent instrument 4, 485 photoelectric converter 5, LC card 6, optical fiber. The differential pressure signal of the flow orifice plate is sent to the intelligent instrument 4 for display by the differential pressure transmitter 1; the temperature signal is sent to the intelligent instrument 4 for display by the thermistor 2; the pressure of the steam supply pipeline is sent to the intelligent instrument 4 for display by the pressure transmitter 3; the intelligent instrument 4 calculates the instantaneous flow according to the differential pressure, temperature, pressure and other signals of the steam supply, and obtains the cumulative flow by accumulation. The intelligent instrument 4 communicates to the upper computer DCS cabinet through the first photoelectric converter through the 485 communication signal through the optical fiber, and the DCS cabinet side is additionally provided with a second photoelectric converter to convert into a 485 signal, and the 485 signal is communicated to the DCS through the LC card 6. After the LC card 6 is configured and configured on the DCS side, the pressure, temperature, instantaneous flow, cumulative flow and other parameters of the intelligent instrument 4 are displayed in real time, and the real-time consistency with the local parameters can be ensured. Embodiment two

[0027] A data conversion device, comprising a shell 7 and wiring ports distributed on the shell 7, the shell 7 is provided with a display screen 8, the shell 7 internally comprises an RS485 signal conversion module 9 for conversion of received signals;

[0028] A first photoelectric conversion module 10 connected with the RS485 signal conversion module 9 for converting RS485 signals into optical signals.

[0029] The shell 7 also comprises an ADC analog signal conversion module 11 for converting received analog signals into digital signals, the output end of the ADC analog signal conversion module 11 is connected with the input end of the RS485 signal conversion module 9.

[0030] It also comprises an RS485 bus output module 12, the input end of the RS485 bus output module 12 receives the output signal of the RS-485 drive chip in the RS485 signal conversion module 9, and the output end of the RS485 bus output module 12 is connected with the first photoelectric conversion module 10.

[0031] The input ends of the RS485 signal conversion module 9 and the ADC analog signal conversion module 11 and the output end of the first photoelectric conversion module 10 are connected with the wiring ports;

[0032] A steam supply data transmission system comprising the data conversion device, the input end of the RS485 signal conversion module 9 and / or the ADC analog signal conversion module 11 is connected with one or more of a differential pressure transmitter 1, a pressure transmitter 3 and a thermistor; the converted digital signal is displayed on the display screen 8 as a real-time parameter after being parsed and calculated by a microcontroller; the RS485 signal conversion module 9 is integrated on the same pcb board with the microcontroller, the data parsed and calculated is connected to a second photoelectric conversion module 13 of a data receiving end through the RS485 bus output module 12 and the first photoelectric conversion module 10;

[0033] It also comprises an LC card 6, the input end of the LC card 6 is connected with the output end of the second photoelectric conversion module 13, and the output end of the LC card 6 is connected with a DCS host.

Claims

1. A data conversion device, comprising a housing (7) and connection ports distributed on the housing (7), characterized in that: The housing (7) includes at least one RS485 signal conversion module (9) for converting received signals; There is also at least one first photoelectric conversion module (10) connected to the RS485 signal conversion module (9) and used to convert the RS485 signal into an optical signal.

2. A data conversion device according to claim 1, characterized in that: It also includes an ADC analog signal conversion module (11), which is used to convert the received analog signal into a digital signal, and the output end of the ADC analog signal conversion module (11) is connected to the input end of the RS485 signal conversion module (9).

3. A data conversion device according to claim 2, characterized in that: It also includes an RS485 bus output module (12), the input end of the RS485 bus output module (12) receives the output signal of the RS-485 driver chip, and the output end is connected to the photoelectric conversion module.

4. A data conversion device according to claim 3, characterized in that: The input ends of the RS485 signal conversion module (9) and the ADC analog signal conversion module (11), and the output end of the first photoelectric conversion module (10) are all connected to the connection port.

5. A data conversion device according to any one of claims 1 to 4, characterized in that: Also included is a display screen (8).

6. A steam supply data transmission system, characterized in that: The data conversion device according to claim 5 is included, wherein the input ends of the RS485 signal conversion module (9) and the ADC analog signal conversion module (11) are connected to one or more of a differential pressure transmitter (1), a pressure transmitter (3), and a thermistor; The first photoelectric conversion module (10) is connected to a second photoelectric conversion module (13) at a data receiving end; The photoelectric conversion module is connected to the DCS host.

7. A steam supply data transmission system according to claim 6, characterized in that: It also includes an LC card (6), the input end of the LC card (6) is connected to the output end of the second photoelectric conversion module (13), and the output end thereof is connected to the DCS host.

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