CN204423051U - Boiler intelligent controller - Google Patents

Abstract

The utility model discloses a boiler intelligent controller, which comprises a central processing module, a switch signal input module, which is used to input the switch signal in the boiler combustion system to the central processing module; an analog quantity input module, which is used to input The analog signal in the boiler combustion system; the PID control module receives the processing signal from the central processing module and outputs the corresponding control signal through PID adjustment; the relay output module is used to transmit the control signal to the boiler combustion system to realize the control of each Relay or solenoid valve; touch display module, to input operation signal to the central processing module and display the above-mentioned switch signal and analog signal in real time; data storage module, used to store the above-mentioned switch signal and analog signal; and power supply module. The utility model optimizes and improves its interior on the basis of the prior art, so that it has more precise control capability.

Description

Boiler intelligent controller

technical field

The utility model belongs to the technical field of boiler combustion control and relates to an intelligent boiler controller.

Background technique

Boiler is a kind of energy conversion equipment. The energy input to the boiler is in the form of chemical energy in fuel, electric energy, heat energy of high-temperature flue gas, etc. After conversion by the boiler, it outputs steam, high-temperature water or organic heat carrier with certain heat energy. . Boiler combustion system generally includes air supply system, ignition system, monitoring system, fuel system and electric control system.

Among them, the function of the air supply system is to send air with a certain wind speed and air volume into the combustion chamber. Mechanisms, diffusion discs.

The function of the ignition system is to ignite the mixture of air and fuel. Its main components are: ignition transformer, ignition electrode, and electric fire high-voltage cable. A safer ignition system is called electronic pulse igniter, which is widely used by gas boiler manufacturers such as Zhuoyi Energy Saving. It is convenient and time-saving, you only need to press it with your fingers, and it has high safety, and there will be no safety accidents due to accidental flameout. Once the flameout occurs, the control system can close the solenoid valve in time and cut off the gas passage.

The function of the monitoring system is to ensure the safe and stable operation of the burner. Its main components include flame monitors, pressure monitors, temperature monitors, water level monitors, etc.

The function of the fuel system is to ensure that the burner burns the required fuel. The fuel system of the oil burner mainly includes: oil pipes and joints, oil pumps, solenoid valves, nozzles, and heavy oil preheaters. Gas burners mainly include filters, pressure regulators, solenoid valves, ignition solenoid valves, and fuel butterfly valves.

The electronic control system is the command center and contact center of the above systems, and its core control element is a controller.

Therefore, the automatic control of the boiler combustion system based on the electronic control system can ensure the safe operation of the boiler. However, the controllers currently on the market have relatively simple control methods and insufficient functions, which has limited the operating capacity of the entire boiler combustion system. Therefore, in order to improve the control capability of the controller and further improve the overall performance of the boiler combustion system, it is necessary to provide a more advantageous controller.

Utility model content

Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an intelligent boiler controller, which optimizes and improves its interior on the basis of the prior art, so that it has more precise control capability.

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

A boiler intelligent controller, including a central processing module with a CPU chip; a switch signal input module (16 channels), used to input the switch signal in the boiler combustion system to the central processing module; The central processing module inputs the analog signal in the boiler combustion system; the PID control module receives the processing signal from the central processing module and outputs the corresponding control signal through PID adjustment; the relay output module is used to transmit the control signal to the boiler combustion system In order to realize the control of each relay or electromagnetic valve; the touch display module has a touch screen, coupled to the central processing module, so as to realize the input operation signal to the central processing module and display the above-mentioned switch signal and analog signal in real time; the data storage module has A memory chip, coupled to the central processing module, is used to store the above-mentioned switching signals and analog signals for real-time calling; and a power module, used as the working power of each of the above-mentioned modules.

Further, it also includes a communication interface module coupled to the central processing module, so as to realize data transmission between external devices and the central processing module.

Further, the CPU chip is a Cortex-M0 processor.

Further, the switch signal includes extremely low steam drum water level protection signal, critically low steam drum water level protection signal, extremely high steam drum water level protection signal, extremely high steam pressure protection signal, burner fault protection signal, and gas pressure low protection signal. signal and fan overload protection signal.

Further, the analog signal includes steam pressure, exhaust gas temperature and drum water level.

Further, the communication interface module uses RS485 protocol for communication.

Further, the relay output module is connected to the burner, the water pump, and the relay or electromagnetic valve in the alarm of the boiler combustion system.

Further, the power module adopts a flyback switching power supply.

Further, the touch screen is a resistive touch screen.

Compared with the prior art, the utility model has the advantages of:

First of all, the touch screen is used, which is more convenient than the combination of buttons and LCD screens currently on the market. Due to the abandonment of the use of buttons, on the one hand, the volume of the entire controller panel is made smaller, and on the other hand, the situation of limited service life of mechanical buttons can be avoided. In addition, this controller also adopts the PID control method, compared with the prior art, which directly controls the action of the relay or solenoid valve according to the switch signal and analog signal, so that the control of the relay or solenoid valve is more accurate and in place. It avoids the situation that the control effect is unsatisfactory due to improper control caused by incomplete grasp of the structure and parameters of the boiler combustion system, or lack of accurate mathematical models. In addition, due to the internal improvement of the controller, the PID control module is actually set inside the controller. In this way, there is no need to configure an additional complete PID controller. On the one hand, the device The installation and wiring are more convenient, and on the other hand, the cost is also reduced.

Description of drawings

Fig. 1 is the schematic diagram of the module of the utility model embodiment.

Detailed ways

The utility model embodiment is further described with reference to Fig. 1.

A boiler intelligent controller, comprising: a central processing module, with a CPU chip; a switch signal input module, used to input switch signals in the boiler combustion system to the central processing module; an analog input module, used to input to the central processing module The analog signal in the boiler combustion system; the PID control module receives the processing signal from the central processing module and outputs the corresponding control signal through PID adjustment; the relay output module is used to transmit the control signal to the boiler combustion system to realize the control of each Relay or solenoid valve; touch display module, with a touch screen, coupled to the central processing module, to realize the input operation signal to the central processing module and real-time display of the above-mentioned switch signal and analog signal; data storage module, with a memory chip, Coupled to the central processing module, used to store the above-mentioned switch signals and analog signals for real-time calling; and a power module, used as the working power of each of the above-mentioned modules.

In the above scheme, the switch signal input module, the analog input module and the relay output module adopt 16-way input and output, and the expansion performance is high. In addition, the PID control module is an intelligent PID control module, the model is XME101. The intelligent PID control module can input one signal and output two signals. The appearance is small, and the product adopts the guide rail snap-in installation method, which is convenient for dense installation. Multiple protection, isolation design, strong anti-interference ability and high reliability.

The instrument input signals include various types of mV, thermal resistance, and thermocouple signals, and can provide transmitter power to return current signals to field two-wire transmitters to facilitate on-site debugging. The first output signal is PID control signal output, which can be selected as standard current output or relay output; the second output signal is transmission or RS485 communication output. The communication interface of the instrument adopts Modbus-RTU mode, which is highly versatile and easy to use.

The practical advantages of this scheme are:

First of all, the touch screen is used, which is more convenient than the combination of buttons and LCD screens currently on the market. Due to the abandonment of the use of buttons, on the one hand, the volume of the entire controller panel is made smaller, and on the other hand, the situation of limited service life of mechanical buttons can be avoided. In addition, this controller also adopts the PID control method, compared with the prior art, which directly controls the action of the relay or solenoid valve according to the switch signal and analog signal, so that the control of the relay or solenoid valve is more accurate and in place. It avoids the situation that the control effect is unsatisfactory due to improper control caused by incomplete grasp of the structure and parameters of the boiler combustion system, or lack of accurate mathematical models.

Further, it also includes a communication interface module, which adopts RS485 protocol communication and is coupled to the central processing module, so as to realize data transmission between external equipment and the central processing module. In this way, remote wired or wireless transmission can be realized through the communication interface module, so as to facilitate the real-time operation and monitoring of the site by the operating room.

In this embodiment, the CPU chip is a Cortex-M0 processor, which is the smallest, lowest energy consumption, and most energy-saving ARM processor in the market. The processor's very low power consumption, low gate count, and small code footprint allow MCU developers to get the performance of a 32-bit processor at the price of an 8-bit processor. The ultra-low gate count also enables it to be used in analog signal equipment, mixed signal equipment and MCU applications, which can significantly save the expansion cost of the system.

In this embodiment, the switch signals include extremely low steam drum water level protection signal, critically low steam drum water level protection signal, extremely high steam drum water level protection signal, extremely high steam pressure protection signal, burner failure protection signal, gas pressure excessive Low protection signal and fan overload protection signal.

Wherein, when the water level in the steam drum reaches an early warning value, the water level monitor in the steam drum will transmit the dangerous low protection signal of the steam drum water level to the central processing module through the switch signal input module. Similarly, when the water levels in the steam drum are respectively When the minimum limit value and the maximum limit value are reached, the water level monitor transmits the extremely low water level protection signal of the steam drum and the extremely high water level protection signal of the steam drum to the central processing module through the switch signal input module respectively. In addition, when the steam pressure in the steam drum reaches the maximum limit value, the pressure monitor in the steam drum will send the extremely high steam pressure protection signal to the central processing module through the switch signal input module. In addition, when the fan of the air supply system is overloaded (the operating current exceeds a certain value), the relevant monitor will also transmit the fan overload protection signal to realize the adjustment of the combustion system through the controller.

In this embodiment, the analog signal includes steam pressure, exhaust gas temperature and drum water level.

Among them, the steam pressure is sent by the pressure monitor to the central processing module through the analog signal input module, the exhaust gas temperature is sent by the temperature monitor installed in the smoke outlet, and the water level monitor installed in the steam drum is also Send the water level in the steam drum to the temperature monitor through the analog signal input module.

In this embodiment, the relay output module is connected to the burner in the boiler combustion system, the water pump and the relay or solenoid valve in the alarm. Therefore, when the burner breaks down, the above-mentioned controller can control the corresponding relay in the burner to stop the work of the burner through the relay output module, and at the same time, can also control the alarm to realize the alarm.

Further, the PID control module adopts a negative feedback closed-loop control method. Specifically, it receives the signal (analog quantity and switch quantity) processed by the CPU once, and then outputs the corresponding control signal through the internal PID algorithm, and transmits it to each relay or solenoid valve in the boiler combustion system through the relay output module to achieve the purpose of control. In addition, the signals input by the switch signal input module and the analog signal input module are sent to the PID control module through the CPU to realize closed-loop feedback. Therefore, the PID control module can change the final control signal output in real time according to its input and output. Realize dynamic adjustment.

Above, the advantage of using PID regulation is that the solenoid valve on the water pump can be controlled more intelligently. By detecting the change of the water level in the steam drum, the rise and fall of the water level in the water pump can be controlled within a small range. However, in the prior art, water is only added after the water level drops to the lowest limit, and water is stopped after it rises to the highest limit. This control method has relatively large defects in practical applications. When the water consumption is large , may cause insufficient water supply from the pump. Therefore, after adopting PID adjustment, the water supply volume of the water pump will be continuously adjusted according to the rise and fall speed of the water level change, and a dynamic adjustment will be realized. This adjustment method is more stable and reliable. In addition, the method of controlling the supply of fuel oil or gas in the burner is also similar and will not be repeated here. In addition, due to the internal improvement of the controller, the PID control module is actually set inside the controller. In this way, there is no need to configure an additional complete PID controller. On the one hand, the device The installation and wiring are more convenient, and on the other hand, the cost is also reduced.

In addition, the power module adopts a flyback switching power supply. This kind of power supply has the characteristics of energy saving, small installation volume, light weight, and can adjust any output and input voltage and current. It can also meet the different outputs of multiple voltages and provide the working voltage of each module in the controller. Due to its small size, it can be directly assembled with each module without a separate case, which greatly reduces the line setting and cost.

In addition, the touch screen is a resistive touch screen. Because in the workshop, the staff all wear gloves, if the capacitive touch screen is used, then the gloves need to be taken off to operate the touch screen, which is extremely inconvenient. Operate the touch screen while wearing gloves.

It is worth noting that this utility model improves the controller itself, rather than the boiler combustion system. Therefore, on the basis of fully grasping the boiler combustion system, combined with the elaboration of the above scheme, those skilled in the art should It is possible to understand the method of using the controller provided by the utility model, therefore, this embodiment does not provide a schematic diagram of each device in the boiler combustion system. In addition, other equipment and related parameters in the combustion system can be directly connected to the switch signal input module. Since the boiler combustion system is a well-known technology at present, the specific details will not be repeated in the embodiments. Equipment and principles.

Claims (9)

1. A boiler intelligent controller, comprising, The central processing module has a CPU chip; The switch signal input module is used to input the switch signal in the boiler combustion system to the central processing module; The analog input module is used to input the analog signal in the boiler combustion system to the central processing module; The PID control module receives the processing signal from the central processing module and outputs the corresponding control signal through PID adjustment; The relay output module is used to send the control signal to the boiler combustion system to control each relay or electromagnetic valve; The touch display module has a touch screen and is coupled to the central processing module to input operation signals to the central processing module and display the above-mentioned switch signals and analog signals in real time; The data storage module has a memory chip, coupled to the central processing module, for storing the above-mentioned switch signals and analog signals for real-time calling; And a power supply module, as the working power supply of each of the above modules. 2 . The boiler intelligent controller according to claim 1 , further comprising a communication interface module coupled to the central processing module, so as to realize data transmission between external devices and the central processing module. 3. The boiler intelligent controller according to claim 1, characterized in that: the CPU chip is a Cortex-M0 processor. 4. The boiler intelligent controller according to claim 1, characterized in that: the switch signal includes the protection signal of extremely low steam drum water level, the protection signal of dangerously low steam drum water level, the extremely high protection signal of steam drum water level, the extremely low steam pressure High protection signal, burner failure protection signal, low gas pressure protection signal and fan overload protection signal. 5. The boiler intelligent controller according to claim 1, characterized in that: said analog signal includes steam pressure, exhaust gas temperature and steam drum water level. 6. The boiler intelligent controller according to claim 2, characterized in that: said communication interface module uses RS485 protocol for communication. 7. The boiler intelligent controller according to claim 1, characterized in that: the relay output module is connected to the burner, water pump and relay or solenoid valve in the boiler combustion system. 8. The boiler intelligent controller according to claim 1, characterized in that: said power supply module adopts a flyback switching power supply. 9. The boiler intelligent controller according to claim 1, characterized in that: the touch screen is a resistive touch screen.