CN204596059U - A kind of electric leakage, fire supervising device based on RS485 bus - Google Patents

Abstract

The utility model discloses a leakage fire prevention monitoring device based on the RS485 bus, which relates to the field of numerical control and includes a data acquisition module, a sub-node controller, an RS485 bus, a master node controller, an LCD display module, a button module, an alarm module, and a water spraying module. Valve and upper computer, the data acquisition module includes a temperature sensor, smoke sensor, voltage transformer, current transformer, zero sequence transformer and peripheral circuits, the temperature sensor and smoke sensor are used to receive indoor signals, the current The transformer can monitor the current of the power distribution system and complete the detection of overload and short circuit functions. The voltage transformer is responsible for monitoring the voltage, power and electric energy of the line. The zero-sequence transformer can detect leakage. The utility model can Accurate and fast detection of fire, and can be linked to the operation.

Description

A leakage fire prevention monitoring device based on RS485 bus

technical field

The utility model relates to the field of numerical control, in particular to a leakage and fire prevention monitoring device based on an RS485 bus.

Background technique

In recent years, fire accidents in school dormitories and family houses have occurred frequently. In order to ensure the safety of people's lives and property, it is of great practical significance to judge the possibility of fire occurrence through detection technology and prevent fire occurrence early. The intelligent fire prevention warning system takes buildings prone to fire as monitoring objects, combines detection technology, computer technology, and field bus technology design to prevent and judge fire situations and automatically alarm. Activate the corresponding fire-fighting facilities to put out the fire, and minimize the harm caused by the fire. However, there are many problems in my country's current fire alarm system. 1. The rate of fire false alarms is high. 2. Due to the overload of wires, the heat and smoke cannot be detected in a short time. When the sensor detects it, the fire has already occurred to the point that it is difficult to control, and it is impossible to ensure that the fire is stifled in the bud. 3. Most of the current fire alarm systems and building security systems in my country are independent systems, and the linkage operation and control operability of fire protection facilities and other equipment is poor. Therefore, it has become an urgent problem to design a product that can accurately and quickly detect fire and be able to link operations.

Utility model content

The purpose of the utility model is to provide a kind of leakage fire prevention monitoring device based on RS485 bus that can detect fire accurately and quickly and can operate in linkage.

A leakage fire prevention monitoring device based on the RS485 bus, characterized in that it includes: a data acquisition module, a sub-node controller, an RS485 bus, a master node controller, an LCD display module, a button module, an alarm module, a water spray valve and a host computer , wherein, the host computer, the LCD display module, and the button module are bidirectionally connected to the master node controller respectively, the master node controller and the sub-node controller are bidirectionally connected to the RS485 bus respectively, and the sub-node controller is connected to the water spray The valve is connected, and the data acquisition module is bidirectionally connected with the sub-node controller. The data acquisition module includes a temperature sensor, a smoke sensor, a voltage transformer, a current transformer, a zero-sequence transformer and peripheral circuits. The temperature sensor and The smoke sensor is used to receive indoor signals. The current transformer can monitor the current of the power distribution system to complete the detection of overload and short circuit functions. The voltage transformer is responsible for monitoring the voltage, power and electric energy of the line. The zero sequence Transformers can detect leakage.

Preferably, the data acquisition module sends the collected information to the sub-node controller, and the sub-node controller is connected with an RS485 bus transceiver circuit, and the sub-node controller sends information to the The master node controller, the master node controller processes the received data and transmits it to the LCD display module and the host computer, and the host computer sends a control command to the master node controller, and after being processed by the master node controller, it converts into the data format of the RS485 bus, and sent to each sub-node controller through the RS485 bus transceiver circuit and the RS485 bus, so as to complete the leakage and fire prevention monitoring.

Preferably, described sub-node controller and master node controller all adopt STC89C51 chip, and its main function is to complete the initialization of RS485 bus controller and the conversion of data format, and described master node controller passes host computer or button module to The RS485 bus sends instructions to control the sub-node controller to drive the water spray valve to open.

Preferably, an AD converter is connected to the sub-node controller, the model of the current transformer is HCT206, the model of the voltage transformer is HPT205N, and the current transformer and the voltage transformer collect The received current and voltage signals are sent to the AD converter model ADS7864, and the AD converter converts the current and voltage analog signals into digital signals and inputs them to the sub-node controller for processing.

Preferably, the RS485 bus transceiver circuit adopts the RSM485CT serial transceiver chip, which is responsible for the data communication between the sub-node controller and the RS485 bus, and the sub-node controller transmits the location of the fire signal through the RS485 bus transceiver circuit and the RS485 bus. , status, fire fighting device information and escape status are sent to the main controller, the main controller communicates with the upper computer through the serial communication interface to notify the building monitoring center, and at the same time, the sub-node controller analyzes the data and uses voice or LCD display Notification of escape routes and information on fire-fighting installations.

The utility model has the advantages of: 1. The utility model adopts the RS485 bus distributed control idea to construct a leakage fire prevention monitoring device with high speed, high precision, strong expansion performance and high reliability;

2. When a fire occurs, the sub-controller sends fire signals such as the location, status, information of fire-fighting devices and escape status to the main controller through the RS485 bus, and the main controller communicates with the host computer through the serial communication interface to notify In the building monitoring center, at the same time, through data analysis, sub-nodes use voice or LCD display to notify the best escape route and fire-fighting device information in time, which can minimize the chaotic scene after the fire and save people's escape and fire-fighting time;

3. The utility model integrates multiple functions such as fire monitoring, leakage prevention and monitoring, control of on-site sprinkler valves for disaster relief, notification of escape routes, etc., and has high practical value.

Description of drawings

FIG. 1 is a schematic diagram of a frame structure of a leakage fire prevention monitoring device based on an RS485 bus according to the present invention.

Fig. 2 is a schematic diagram of the connection between the controller and the RS485 bus transceiver circuit of a leakage fire prevention monitoring device based on the RS485 bus described in the utility model.

Fig. 3 is a voltage transformer and current transformer acquisition and conversion circuit of a leakage fire prevention monitoring device based on the RS485 bus described in the utility model.

Fig. 4 is a short-circuit voltage and current AD conversion circuit of a leakage fire prevention monitoring device based on the RS485 bus described in the utility model.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.

As shown in Figure 1, a kind of leakage prevention fire monitoring device based on RS485 bus of the present embodiment includes: data acquisition module, sub-node controller, RS485 bus, master node controller, LCD display module, button module, alarm module, Spray valve and upper computer. The data acquisition module includes a temperature sensor, a smoke sensor, a voltage transformer, a current transformer, a zero-sequence transformer and peripheral circuits. The temperature sensor and the smoke sensor receive indoor signals, and the current transformer monitors the power distribution system The current to complete the detection of overload and short circuit functions, the voltage transformer is responsible for monitoring the detection of line voltage, power and electric energy, the zero sequence transformer is responsible for leakage detection, and the data acquisition module sends the collected information to The sub-node controller, and send the main node controller through the RS485 bus transceiver circuit and RS485 connected to the sub-node controller, and the said main node controller sends the received data to the LCD display module and the upper computer after processing, the said The host computer sends control instructions to the master node controller, and the master node controller converts it into a data format suitable for the RS485 bus after processing, and sends it to each sub-node controller through the RS485 bus transceiver circuit and the RS485 bus, thereby completing leakage prevention. monitor.

It is worth noting that the sub-node controller and the main node controller are the control carriers of the entire communication system, which are used to collect indoor signals, can realize the communication function of the RS485 bus, and complete the conversion of data formats. The sub-node control Both the device and the master node controller use the STC89C51 chip.

In this embodiment, the model of the current transformer is HCT206, and the model of the voltage transformer is HPT205N. The current transformer is used to monitor the current of the power distribution system and complete the detection of overload and short circuit functions. The voltage transformer mainly Responsible for monitoring the voltage, power and electric energy of the line.

As shown in Figure 2, in this embodiment, the TXD, RXD and DE terminals of the sub-node controller are respectively connected to the TXD, RXD and DE terminals of the RSM485CT, and the A and B terminals of the RSM485CT are respectively connected to the AB line of the RS485 bus.

As shown in Figure 3, in this embodiment, the model of the current transformer is HCT206, the model of the voltage transformer is HPT205N, the output terminals I _a , I _b , I _c , U _a , U of the conversion circuit _b and U _c are respectively connected to the CHA1+, CHB1+, CHC1+, CHA0+, CHB0+, CHC0+ pins of the AD converter ADS7864.

Fig. 4 is the AD conversion circuit of the short-circuit voltage and current in the embodiment of the present invention, the sub-node controller is connected with an AD converter, and the current transformer and the voltage transformer transmit the collected current and voltage signals through the peripheral circuit After entering the AD converter of model ADS7864, the AD converter converts the current and voltage analog signals into 8-bit digital signals and outputs them to the P0-P7 ports of the sub-node controller through DB0-DB7.

The above descriptions are only preferred implementations of the present utility model, and the scope of protection of the present utility model is not limited to the above-mentioned implementations. All technical solutions belonging to the principle of the utility model belong to the protection scope of the utility model. For those skilled in the art, some improvements and modifications made on the premise of not departing from the principle of the utility model, these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims (5)

1. A leakage fire prevention monitoring device based on RS485 bus is characterized in that, comprising: data acquisition module, sub-node controller, RS485 bus, master node controller, LCD display module, button module, alarm module, water spray valve and Host computer, wherein, described host computer, LCD display module, button module are bidirectionally connected with master node controller respectively, described master node controller, subnode controller are bidirectionally connected with RS485 bus respectively, described subnode controller and The water spray valve is connected, and the data acquisition module is bidirectionally connected with the sub-node controller. The data acquisition module includes a temperature sensor, a smoke sensor, a voltage transformer, a current transformer, a zero-sequence transformer and peripheral circuits. Sensors and smoke sensors are used to receive indoor signals. The current transformer can monitor the current of the power distribution system and complete the detection of overload and short circuit functions. The voltage transformer is responsible for monitoring the voltage, power and electric energy of the line. The zero-sequence transformer can detect the leakage. 2. a kind of leakage fire prevention monitoring device based on RS485 bus according to claim 1, is characterized in that: described data acquisition module sends the information that collects to sub-node controller, and described sub-node controller is connected with RS485 bus Transceiver circuit, the sub-node controller sends information to the master node controller through the RS485 bus transceiver circuit and the RS485 bus, and the master node controller processes the received data and transmits it to the LCD display module and the upper computer, so The host computer sends control instructions to the master node controller, after being processed by the master node controller, it is converted into the data format of the RS485 bus, and sent to each sub-node controller through the RS485 bus transceiver circuit and the RS485 bus, thereby completing leakage and fire prevention monitoring. 3. A kind of leakage fire prevention monitoring device based on RS485 bus according to claim 1, is characterized in that: described sub-node controller and main node controller all adopt STC89C51 chip, and its main function is to finish RS485 bus controller initialization and data format conversion, the master node controller sends instructions to the RS485 bus through the host computer or the key module to control the sub-node controller to drive the water spray valve to open. 4. A kind of leakage fire prevention monitoring device based on RS485 bus according to claim 1, it is characterized in that: said sub-node controller is connected with AD converter, the model of said current transformer is HCT206, said voltage The model of the transformer is HPT205N, and the current transformer and the voltage transformer transmit the collected current and voltage signals to the AD converter of the model ADS7864 through the peripheral circuit, and the AD converter converts the current and voltage analog signals into The digital signal is input to the sub-node controller for processing. 5. a kind of leakage fire prevention monitoring device based on RS485 bus according to claim 1, is characterized in that: described RS485 bus transceiver circuit adopts RSM485CT serial port transceiver chip, is responsible for the data communication between sub-node controller and RS485 bus , the sub-node controller sends the location, status, information of the fire fighting device and escape status of the fire signal to the main controller through the RS485 bus transceiver circuit and the RS485 bus, and the main controller communicates with the host computer through the serial communication interface To notify the building monitoring center, and at the same time, through data analysis, the sub-node controller notifies the escape route and fire-fighting device information by voice or LCD display.