CN209247120U - Water level measuring system based on balance cover type pressure sensor - Google Patents

Abstract

The utility model relates to a water level measurement system based on a balanced cover type pressure sensor, which is characterized in that it includes several collection terminals, a monitoring center server and a mobile terminal; the collection terminal transmits data to the monitoring center server through wireless communication; the mobile terminal passes Wireless communication can access monitoring center server data. The utility model is an integrated platform integrating the collection, storage and query of water and rain data and images. The system takes the lead in integrating traditional water and rain data, on-site images, and early warning systems. The collection terminal basically realizes self-power supply, maintenance-free and channel Self-adaptive; it can well meet the disaster prevention and alarm requirements of unattended, less-attended substations and other power production areas.

Description

Water level measurement system based on balanced cover pressure sensor

technical field

The utility model relates to the field of automatic detection, in particular to a water level measurement system and method based on a balance cover type pressure sensor.

Background technique

At present, the drainage facilities of substations and hydropower plants in my country are basically not equipped with automatic monitoring devices. The early warning and monitoring system for water level is mainly used in hydrological observation stations such as rivers and reservoirs, basically using professional water level sensors (such as floats, electric pressure sensors, ultrasonic sensors, optical fiber liquid level sensing devices, etc.), such as with special measuring wells, and A communication method based on general packet radio service (GPRS).

At present, there is no integrated platform for water and rain monitoring for important drainage facilities of important substations in China. The ubiquitous water level monitoring system basically relies on traditional monitoring methods such as float type and electric pressure type. In recent years, systems such as ultrasonic measurement and optical fiber liquid level measurement have appeared, but they all have problems such as high investment costs, large engineering quantities, high requirements for the measurement environment, and low anti-interference. At the same time, some monitoring systems have a series of problems such as difficulty in obtaining electricity on site, and inability to self-supply power supply. Specifically in:

(1) The traditional water level measurement scheme is not suitable for drainage facilities in power production areas. Especially in the water level acquisition part, it is necessary to use the water level sensor with a special measuring well to eliminate water level fluctuations and block water impurities. The degree is low, and it is difficult to popularize and apply it in places such as substations and power plant buildings.

(2) The degree of visualization of collected data is not high. Due to the use of GPRS communication mode, the transmission bandwidth is limited, so that the accuracy of the measurement data cannot be verified. When the on-site sensor fails, the dispatching and maintenance personnel at the remote end cannot detect and deal with it in time, which seriously affects the accuracy of water level measurement. influences. Especially in the event of a flood disaster, real-time, accurate, and intuitive data cannot be obtained, which brings difficulties to emergency response work.

(3) The acquisition mode is single. It is generally set to a fixed time interval timing collection method, so the frequency of data acquisition is fixed, the collection method is passive, and cannot be changed according to specific needs and time periods, and cannot meet the requirements of short-term intensive observation and key prevention during disasters.

(4) Insufficient flexibility of data interaction. After the data is input to the background server system, no user-oriented interactive data query service is provided. This creates limitations in the use of the system in terms of time and place, and at the same time, users cannot actively obtain relevant data.

(5) Data analysis ability is not strong. Existing solutions generally only simply collect and retain the collected data, but do not analyze, manage and provide data report services, and cannot automatically analyze the law of water disasters at each monitoring point based on the data, providing a basis for disaster prediction and prevention.

Contents of the invention

In view of this, the purpose of this utility model is to provide a water level measurement system based on a balanced cover pressure sensor, which can well meet the disaster prevention and alarm requirements of unattended and few-attended substations and other power production areas.

In order to achieve the above object, the utility model adopts the following technical solutions:

A water level measurement system based on a balanced cover pressure sensor, including several collection terminals, a monitoring center server, and a mobile terminal; the collection terminal transmits data to the monitoring center server through wireless communication; the mobile terminal can access monitoring center server data through wireless communication .

Further, the acquisition terminal is composed of a water level pressure sensor, a video acquisition module, a signal conditioning circuit, a detection terminal controller, a communication module, a display module and a power supply unit; the water level pressure sensor, the signal conditioning circuit and the detection terminal controller are sequentially connection; the signal conditioning circuit is connected to the display module; the communication module is connected to the detection terminal controller and the video acquisition module respectively.

Further, the detection terminal controller adopts AT89C51 single-chip microcomputer.

Further, the water level pressure sensor adopts a balanced cover pressure sensor.

Further, the described control method of a water level measurement system based on a balanced mask pressure sensor is characterized in that it includes the following steps:

Step S1: system initialization, setting acquisition mechanism;

Step S2: according to the control and configuration instruction sent by the monitoring center server, control the acquisition terminal;

Step S3: If the collection instruction is received, the data collected by the water level pressure sensor is sampled and analyzed, and the scene image is obtained, and sent back to the monitoring center server; if the collection instruction is not received, the sensor water level is checked according to the default sampling frequency of the system. The data collected by the pressure sensor is sampled; the mobile terminal can obtain water level pressure sensor data and on-site image data by accessing the monitoring center server; The sampling frequency is configured, and the output data of the pressure sensor is obtained according to this setting, and the data is packaged and sent to the server according to the defined protocol format;

Step S4: When the detected water level exceeds the preset safety range, an alarm is sent to the monitoring center server; if the water level is in the normal range, the data is packaged and sent to the monitoring center server through the communication module for storage, and by the set time After the delay, continue to collect the water level in a loop.

Further, in the sampling, the algorithm of taking the average of 5 consecutive measurements is used to reduce the error: the sampling interval is 200ms, if the output value of the water level pressure sensor deviates from 5% of the average value of 5 times, it is considered that the data error this time is too large , eliminate, only calculate the average value of the remaining values, and return the obtained average value to the management host.

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

1. The utility model adopts a new type of water level acquisition device. For typical application scenarios in power production areas, such as substations and mountainous hydropower stations, simple and easy maintenance and strong anti-interference hardware systems are selected to realize accurate collection of on-site water level data without large-scale construction (such as construction of special water wells) and high cost investment. , that is, through the balanced filter cover type pressure sensor, the water wave damping can be effectively filtered out, and accurate and stable measurement data can be obtained, which has good scalability and promotion

2. The utility model formulates flexible and diverse acquisition mechanisms. Through the programming of the software control system, the regular collection, early warning collection and controlled collection of water regime data are realized, and the interaction with mobile terminals through 4G/GPRS (APP/SMS/MMS) realizes the intelligentization of disaster early warning. It enables inspection and maintenance personnel to discover disasters and dangers in time and take measures quickly, which is of positive significance to substation flood prevention and disaster relief work.

3. The utility model realizes data sharing and analysis. Through the development of mobile APP software, it provides users with all-weather and all-round data exchange services. At the same time, the data can be easily analyzed to provide a reliable basis for disaster early warning and prevention.

Description of drawings

Fig. 1 is a schematic diagram of the utility model system;

Fig. 2 is a schematic diagram of the acquisition terminal of the present utility model;

Fig. 3 is the device diagram of the water level pressure sensor adopted in the utility model embodiment;

Fig. 4 is T89C51 single-chip microcomputer acquisition and display interface circuit in the utility model embodiment;

Fig. 5 is the sim7100c interface circuit in the utility model embodiment;

Fig. 6 is a control flowchart in the utility model embodiment;

Fig. 7 is a diagram of the software function structure in the embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Please refer to Fig. 1, the utility model provides a kind of water level measurement system based on the balanced cover type pressure sensor, including several collection terminals, monitoring center server and mobile terminal; the collection terminal transmits data to the monitoring center server through wireless communication; mobile terminal The monitoring center server data can be accessed through wireless communication.

With reference to Fig. 2, in one embodiment of the utility model, described acquisition terminal is made up of water level pressure sensor, video acquisition module, signal conditioning circuit, detection terminal controller, communication module, display module and power supply unit; Said water level pressure sensor The signal conditioning circuit is connected to the detection terminal controller in sequence; the signal conditioning circuit is connected to the display module; the communication module is connected to the detection terminal controller and the video acquisition module respectively.

In this embodiment, as shown in FIG. 4 , the detection terminal controller adopts AT89C51 single-chip microcomputer; wherein, the single-chip microcomputer AT89C51 chip receives the data signal sent by the analog-to-digital converter ADC0809. The first 3 bits of the P0 port are connected to the ADC0809 address lines A, B and C, as a signal selection for multi-channel acquisition signal input. The signal combination of P2.6, RD and WR output of AT89C51 provides START, AIE and OE signals of ADC0809, and the bidirectional data transmission port P0 of AT89C51 is connected with D0-D7 of ADC0809 as the interface for collecting data. The INT1 pin of AT89C51 is connected to the EOC inversion signal of ADC0809, which is used to detect whether the A/D conversion is over. Port P0 of AT89C51 reads the conversion result after the conversion is completed. The conversion result is sent to the liquid crystal display LCD1602 for display at the same time.

In this embodiment, as shown in FIG. 3 , the water level pressure sensor adopts a balanced cover type pressure sensor. The range can reach 200m, and the two-wire system outputs a linear current signal of 0-20mA. When the sensor is put into a certain depth of the liquid to be measured, the pressure formula it receives is

(1)

In the formula: is the pressure on the liquid surface of the sensor, ; is the measured water flow density, ; g is the acceleration due to gravity, ; Depth of pouring liquid into the balance cover part; is the atmospheric pressure on the liquid surface, .

Since the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the gas-conducting stainless steel, the atmospheric pressure on the liquid surface Connected to the negative pressure chamber of the sensor, which offsets the negative pressure on the front of the sensor , so the pressure measured by the sensor is , the pressure measured by , the depth of the liquid level can be obtained . The ADC interface of the controller is connected with the current output of the pressure sensor to complete the collection and digital processing of the pressure data and convert it into water level information.

In this embodiment, the wireless communication module chip adopts SIM7100C, and the asynchronous serial communication interface is used between the module and the single-chip microcomputer. The serial port of SIM7100C adopts a level matching design, and uses SS8050 triode and resistors to form a level conversion circuit, so that the 1.8V level applicable to the interface can be interfaced with a 5V system. The hardware interface circuit of SIM7100C is shown in Figure 5.

When the TXD of the single-chip microcomputer is at high level, the triode SS8050 is cut off, and the RXD interface of SIM7100C is pulled up to 1.8V level. When the TXD of the single-chip microcomputer is low level, SS8050 is saturated, and the RXD interface of SIM7100C becomes low level.

The control microcontroller sends AT commands to SIM7100C to configure the Internet, and uses the PPP protocol to establish a network connection with the supplier, and obtains its own IP address, and then establishes a connection between the terminal and the server through the TCP/IP protocol to collect data and transmission of configuration commands.

In this embodiment, the described control method based on the balanced cover pressure sensor water level measurement system is characterized in that it includes the following steps:

Step S1: system initialization, setting acquisition mechanism;

Step S2: according to the control and configuration instruction sent by the monitoring center server, control the acquisition terminal;

Step S3: If the collection instruction is received, the data collected by the water level pressure sensor is sampled and analyzed, and the scene image is obtained, and sent back to the monitoring center server; if the collection instruction is not received, the sensor water level is checked according to the default sampling frequency of the system. The data collected by the pressure sensor is sampled; the mobile terminal can obtain water level pressure sensor data and on-site image data by accessing the monitoring center server; The sampling frequency is configured, and the output data of the pressure sensor is obtained according to this setting, and the data is packaged and sent to the server according to the defined protocol format;

Step S4: When the detected water level exceeds the preset safety range, an alarm is sent to the monitoring center server; if the water level is in the normal range, the data is packaged and sent to the monitoring center server through the communication module for storage, and by the set time After the delay, continue to collect the water level in a loop.

Once the water level in the system changes, the acquisition terminal will immediately collect and analyze the data, and the corresponding data will be transmitted to the central station to complete the preprocessing and enter the database, and then distributed and notified to the relevant departments. When the warning threshold is reached, a broadcast warning can be made according to the setting.

In this embodiment, an algorithm of averaging 5 consecutive measurements is used in the sampling to reduce the error: the sampling interval is 200 ms, if the output value of the water level pressure sensor deviates from 5% of the average value of 5 times, it is considered that the data of this time If the error is too large, remove it, and only calculate the average value of the remaining values, and return the obtained average value to the management host.

In this embodiment, the mobile terminal functional blocks mainly include data management, data backup, data display, early warning, communication interface, and mobile terminal software. The functional structure of the mobile terminal software is shown in FIG. 7 .

Adopt Socket-based communication protocol and SQL database. The communication with the acquisition terminal uses the Socket programming control to complete the connection of TCP/IP and the sending and receiving of data. The management center software realizes functions such as data receiving, real-time display, data backup, historical query, analysis and statistics, alarm and report printing.

The management software receives and manages the change information of the water level of each monitoring point. Before the system is started, set up each water level acquisition terminal, define the name, number, location and safe water level range of the node, etc. After the setting is completed, add and activate the ID of the node, and then it can be displayed on the monitoring interface of the software. Node related information and real-time data. It can also display the water level changes of each monitoring point in the form of a curve, and set the sound and light alarm for abnormal alarm signals.

The mobile terminal software part includes equipment management, remote configuration, real-time data, historical data, picture information, video information and other functions. Through the APP, you can easily query the current and historical water level values, alarm information, and equipment status of the required observation nodes.

The above descriptions are only preferred embodiments of the present utility model, and all equal changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (3)

1. A water level measurement system based on a balanced cover type pressure sensor, characterized in that: comprise some collection terminals, monitoring center server and mobile terminal; said collection terminal transmits data to the monitoring center server by wireless communication; mobile terminal passes wireless communication Can access monitoring center server data; The collection terminal is composed of a water level pressure sensor, a video acquisition module, a signal conditioning circuit, a detection terminal controller, a communication module, a display module and a power supply unit; the water level pressure sensor, a signal conditioning circuit and a detection The terminal controllers are connected sequentially; the signal conditioning circuit is connected with the display module; the communication module is respectively connected with the detection terminal controller and the video acquisition module. 2. A water level measurement system based on a balanced cover type pressure sensor according to claim 1, characterized in that: said detection terminal controller adopts AT89C51 single-chip microcomputer. 3. A water level measuring system based on a balanced bell-type pressure sensor according to claim 1, wherein the water level pressure sensor is a balanced bell-type pressure sensor.