Heating furnace combustion program controller supporting connection of multiple actuators

Abstract

The utility model discloses a heating furnace combustion program controller supporting connection of multiple actuators. The heating furnace combustion program controller comprises a safety function module and a non-safety function module. The safety function module comprises a power supply function module, a safety detection module, a reset module, a flame detection module, a storage module, a main control module, a communication module, a power supply interlocking / alarm output module, a safety valve control module, a fan control module, a fuel valve control module and an ignition control module; the non-safety function module comprises an air pressure detection module, a gas pressure detection module, a valve group leak detection module, an external power regulation module and an actuator control / detection module; the power supply function module supplies power to other modules, and the master control module is connected with all other modules. The controller is comprehensive in function and reliable in performance, and supports simultaneous parallel connection of a plurality of actuators, so that omnibearing accurate control of the combustor is realized, the cost performance of the combustor is improved, and a powerful guarantee is provided for safe and efficient operation of an oil and gas gathering and transportation system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of combustion program controller, specifically relates to a kind of heating furnace combustion program controller of support connection multiple actuators. BACKGROUND

[0002] In oil and gas gathering and transportation system, heating furnace plays a vital role, they are responsible for heating, transporting crude oil, natural gas or oil and gas mixture, and providing heating function, ensure the smooth progress of oil and gas gathering and processing technology. In order to realize these functions, heating furnace relies on burner to carry out ignition, extinguishing, firepower adjustment and air pressure and valve group leakage detection and other key operations. And the effective control of burner cannot do without the core equipment of combustion program controller. The combustion program controller commonly used in current market mostly supports to control two actuators simultaneously, respectively controls the flow of gas and air, and the function is relatively single, cannot meet more complex control demand. Although part of brand product can support to connect multiple actuators, realize more functions, but high price, maintenance difficulty and installation problem of serial interface all limit its wide application in market. More seriously, once serial interface fails, all actuators will be out of control, and great hidden danger is brought to production safety. Therefore, it is necessary to propose a kind of heating furnace combustion program controller of support connection multiple actuators to solve the above problems. SUMMARY

[0003] The utility model aims at the deficiency of prior art, provide a kind of heating furnace combustion program controller of support connection multiple actuators, can realize ignition, extinguishing, fire, gas pressure detection, valve group leakage detection, and support multiple actuators to work simultaneously in parallel.

[0004] The utility model provides a kind of heating furnace combustion program controller of support connection multiple actuators, it includes: safety function module and non-safety function module;

[0005] The safety function module includes: power supply function module, safety detection module, reset module, flame detection module, storage module, main control module, communication module, power interlock / alarm output module, safety valve control module, fan control module, fuel valve control module, ignition control module;

[0006] The non-safety function module includes: air pressure detection module, gas pressure detection module, valve group leak detection module, external power regulation module, actuator control / detection module;Power supply function module is the power supply for other modules, and main control module is connected with all other modules.

[0007] Further, the master module comprises: a single-chip microcomputer U1, a clock monitoring chip U28, a reference source chip U3, a RAM chip U53, a crystal oscillator Y1, a crystal oscillator Y3, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a state indicator lamp D1, a resistor R8, and a resistor R7; the single-chip microcomputer U1 is a single-chip microcomputer with double central processing units; the clock monitoring chip U28, the reference source chip U3, and the RAM chip U53 are connected with the single-chip microcomputer U1 respectively; the capacitor C6 and the capacitor C7 are connected with the crystal oscillator Y1 and then connected to the single-chip microcomputer U1; the capacitor C8 and the capacitor C9 are connected with the crystal oscillator Y3 and the resistor R7 and then connected to the single-chip microcomputer U1; the resistor R8 is connected with the state indicator lamp D1 and then connected to the single-chip microcomputer U1.

[0008] Further, the power supply function module comprises an AC power supply to DC 24V circuit, a DC 24V to DC 5V circuit, a DC 5V to DC 3.3V circuit, an under / over voltage protection module, and a power failure detection module.

[0009] The safety detection module comprises a diode D5, an optical coupler U33, a resistor R20, a resistor R139, a resistor R74, a resistor R104, and a filter capacitor C26; the diode D5 is connected in series with the resistor R20 and then connected to the optical coupler U33; the resistor R139 is connected to the optical coupler U33; the resistor R104 is connected to the optical coupler U33; the resistor R74 is connected between the optical coupler U33 and one end of the resistor R104; and the filter capacitor C26 is connected between the other end of the resistor R104 and the GND.

[0010] The reset module comprises a diode D39, an optical coupler U34, a resistor R149, a resistor R178, a resistor R162, a resistor R12, and a filter capacitor C83; the diode D39 is connected in series with the resistor R149 and then connected to the optical coupler U34; the resistor R178 is connected to the optical coupler U34; the resistor R162 is connected to the optical coupler U34; the resistor R12 is connected between the optical coupler U34 and one end of the resistor R162; and the filter capacitor C83 is connected between the other end of the resistor R162 and the GND.

[0011] Further, the flame detection module comprises an ionization bar signal processing circuit, an ultraviolet light tube signal processing circuit, an external flame detector switch signal processing circuit, and an infrared flame sensor signal processing circuit.

[0012] The storage module comprises a ferroelectric memory U46, a resistor R15, and a resistor R16; one end of the resistor R15 and one end of the resistor R16 are connected between the ferroelectric memory U46 and the single-chip microcomputer U1 respectively.

[0013] The communication module comprises a communication circuit of a matching hand controller and a communication circuit of an upper computer.

[0014] The power interlock / alarm output module includes optocoupler U8, optocoupler U36, resistor R14, resistor R22, resistor R25, resistor R103, capacitor C24, capacitor C44, relay K1, diode D9; resistor R25 is connected to optocoupler U8, optocoupler U8 is connected to resistor R22 and one end of capacitor C44 respectively, diode D9 and relay K1 are connected in parallel and to the other end of resistor R22 and capacitor C44; resistor R103 is connected to optocoupler U36, optocoupler U36 is connected to resistor R14 and one end of capacitor C24 respectively, the other end of resistor R14 and capacitor C24 is connected to the other end of resistor R22 and capacitor C44.

[0015] Further, the safety valve control module includes optocoupler U10, optocoupler U15, optocoupler U41, resistor R31, resistor R32, resistor R47, resistor R48, resistor R50, resistor R52, resistor R127, resistor R128, capacitor C46, capacitor C48, capacitor C53, relay K2, diode D14, diode D20; resistor R32 is connected to optocoupler U10, one end of resistor R31 and capacitor C48 is connected to optocoupler U10, diode D14 and relay K2 are connected in parallel and to the other end of resistor R31 and capacitor C48; resistor R128 is connected to optocoupler U41, one end of resistor R127 and capacitor C46 is connected to optocoupler U41 respectively, the other end of resistor R127 and capacitor C46 is connected to the other end of resistor R31 and capacitor C48; diode D20 is connected to optocoupler U15 after being connected in series with resistor R48, resistor R52 is connected to optocoupler U15, resistor R50 is connected to optocoupler U15, resistor R47 is connected between one end of resistor R50 and optocoupler U15, capacitor C53 is connected between the other end of resistor R50 and GND.

[0016] Further, the fan control module includes optocoupler U37, optocoupler U38, optocoupler U39, resistor R2, resistor R3, resistor R4, resistor R5, resistor R18, resistor R19, resistor R122, resistor R126, capacitor C31, capacitor C41, capacitor C45, relay JK9, diode D56, diode D57; resistor R19 is connected to optocoupler U37, one end of resistor R18 and capacitor C31 is connected to optocoupler U37 respectively, diode D56 and relay JK9 are connected in parallel and to the other end of resistor R18 and capacitor C31; resistor R126 is connected to optocoupler U39, one end of resistor R122 and capacitor C45 is connected to optocoupler U39 respectively, the other end of resistor R122 and capacitor C45 is connected to the other end of resistor R18 and capacitor C31; diode D57 is connected with optocoupler U38 after being connected in series with resistor R2, resistor R3 is connected with optocoupler U38, one end of resistor R5 is connected with optocoupler U38, resistor R4 is connected between one end of resistor R5 and optocoupler U38, capacitor C41 is connected between the other end of resistor R5 and GND.

[0017] Further, the fuel valve control module comprises a control circuit of the fuel valve V1 and a control circuit of the fuel valve V2.

[0018] Further, the ignition control module comprises a control circuit of the ignition transformer and a control circuit of the ignition solenoid.

[0019] The air pressure detection module comprises a diode D23, an optical coupler U17, resistors R53, R54, R59 and R63 and a filter capacitor C55; the diode D23 and the resistor R53 are connected in series and then connected to the optical coupler U17; the resistor R63 is connected to the optical coupler U17; one end of the resistor R59 is connected to the optical coupler U17; the resistor R54 is connected between one end of the resistor R59 and the optical coupler U17; and the filter capacitor C55 is connected between the other end of the resistor R59 and the GND.

[0020] Further, the gas pressure detection module comprises a high-pressure gas detection circuit and a low-pressure gas detection circuit.

[0021] The valve group leak detection module circuit comprises a diode D10, an optical coupler U9, resistors R23, R24, R27 and R28 and a capacitor C47; the diode D10 and the resistor R24 are connected in series and then connected to the optical coupler U9; the resistor R28 is connected to the optical coupler U9; one end of the resistor R27 is connected to the optical coupler U9; the resistor R23 is connected between the optical coupler U9 and one end of the resistor R27; and the capacitor C47 is connected between the other end of the resistor R27 and the GND.

[0022] Further, the external power adjustment module comprises a switching power adjustment circuit and an analog power adjustment circuit; and the actuator control module comprises a pulse actuator control circuit and an analog actuator control circuit.

[0023] The heating furnace combustion program controller provided by the utility model has the advantages that the combustion program controller is rich in functions, reliable in performance and low in cost, can independently realize the functions of ignition, fire raising, fire lowering, valve group leak detection, flame detection, power adjustment and the like of a heating furnace / boiler and is applicable to most heating furnaces / boilers with different functions. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0025] Figure 1 The whole function block diagram of the heating furnace combustion program controller supporting connection of multiple actuators of the present application;

[0026] Figure 2 The circuit diagram of the main control module;

[0027] Figure 3 The circuit block diagram of the power supply function module, wherein, Figure 3 (a) is an AC power to DC 24V circuit, Figure 3 (b) is a DC 24V to DC 5V circuit, Figure 3 (c) is a DC 5V to DC 3.3V circuit, Figure 3 (d) is an under / over voltage protection module, Figure 3 (e) is a power failure detection module;

[0028] Figure 4 The safety detection module;

[0029] Figure 5 The reset module;

[0030] Figure 6 The flame detection module, wherein, Figure 6 (a) is an ion bar signal processing circuit, Figure 6 (b) is an ultraviolet light tube signal processing circuit, Figure 6 (c) is an external flame detector on-off signal processing circuit, Figure 6 (d) is an infrared flame sensor signal processing circuit;

[0031] Figure 7 The storage module;

[0032] Figure 8 The communication module, wherein, Figure 8 (a) is a communication circuit of a matching hand controller, Figure 8 (b) is a communication circuit of an upper computer;

[0033] Figure 9 The power interlock / alarm output module;

[0034] Figure 10 The safety valve control module;

[0035] Figure 11 The fan control module;

[0036] Figure 12 a fuel valve control module, wherein, Figure 12 (a) a control circuit for fuel valve V1, Figure 12 (b) a control circuit for fuel valve V2;

[0037] Figure 13 a ignition control module, wherein, Figure 13 (a) a control circuit for ignition transformer, Figure 13 (b) a control circuit for ignition solenoid;

[0038] Figure 14 an air pressure detection module;

[0039] Figure 15 a gas pressure detection module, wherein, Figure 15 (a) a high pressure detection circuit for gas, Figure 15 (b) a low pressure detection circuit for gas;

[0040] Figure 16 a valve group leak detection module circuit;

[0041] Figure 17 an external power regulation module, wherein, Figure 17 (a) a switch quantity power regulation circuit, Figure 17 (b) an analog quantity power regulation circuit;

[0042] Figure 18 an actuator control module, wherein, Figure 18 (a)- Figure 18 (c) a pulse quantity actuator control circuit, Figure 18 (d)- Figure 18 (f) an analog quantity actuator control circuit. DETAILED DESCRIPTION

[0043] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be pointed out that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0044] Please refer to Figures 1 to 18The utility model discloses a kind of heating furnace combustion program controllers supporting connection multi-actuator, comprising: safety function module and non-safety function module;The safety function module includes: power supply function module, safety detection module, reset module, flame detection module, storage module, main control module, communication module, power interlock / alarm output module, safety valve control module, fan control module, fuel valve control module, ignition control module;The non-safety function module includes: air pressure detection module, gas pressure detection module, valve group leak detection module, external power regulation module, actuator control / detection module;Power supply function module is powered for other modules, and main control module is connected with all other modules.

[0045] Figure 1 As shown is the overall function block diagram of the present application combustion program controller.Function module is divided into two categories: safety function module and non-safety function module;Safety function module refers to the function module that needs to meet the safe operation requirement of burner, including: power supply function module, safety detection module, reset module, flame detection module, storage module, main control module, communication module, power interlock / alarm output module, safety valve control module, fan control module, fuel valve control module, ignition control module;Non-safety function module includes: air pressure detection module, gas pressure detection module, valve group leak detection module, external power regulation module, actuator control / detection module.Power supply function module is powered for other modules, and main control module is connected with all other modules.

[0046] Figure 2 As shown is main control module circuit, its role is signal input detection, signal output control, logic judgment, data communication etc., this module uses single-chip microcomputer with double central processing unit, also includes reference source circuit, clock monitoring circuit etc.Circuit composition includes: single-chip microcomputer U1, clock monitoring chip U28, reference source chip U3, RAM chip U53, crystal oscillator Y1, crystal oscillator Y3, capacitor C6, capacitor C7, capacitor C8, capacitor C9, status indicator lamp D1, resistance R8, resistance R7.Clock monitoring chip U28, reference source chip U3, RAM chip U53 are connected with single-chip microcomputer U1 respectively, capacitor C6, capacitor C7 are connected with crystal oscillator Y1 and then connected to single-chip microcomputer U1, capacitor C8, capacitor C9 are connected with crystal oscillator Y3 and resistance R7 and then connected to single-chip microcomputer U1, resistance R8 is connected with status indicator lamp D1 and then connected to single-chip microcomputer U1.Single-chip microcomputer receives the signal of other modules and outputs corresponding control signal;Reference source chip provides 2.5V reference voltage for ADC;Clock monitoring circuit monitors single-chip microcomputer program running, and can reset single-chip microcomputer when program running error;Crystal oscillator group provides stable clock signal to single-chip microcomputer;The double processing core that can run in lockstep in single-chip microcomputer interior can realize real-time program running monitoring, and if one core fails, spare core will start working, guarantee equipment normal operation.

[0047] Figure 3 (a)- Figure 3 (e)The circuit block diagram of the power supply function module is shown. The power supply function module converts the external input AC 110V~250V (typical value 220V) power supply into DC 24V, DC 5V and DC 3.3V in turn. The 24V power supply mainly supplies power to the actuator and relay group; the 5V power supply mainly supplies power to the communication chip and reference source chip; and the 3.3V power supply mainly supplies power to the single-chip microcomputer, storage circuit and signal circuit. During the operation of the programmer, the power supply function module continuously monitors the power supply input voltage, so that the programmer will safely shut down and store data when the power supply is under-voltage, over-voltage or suddenly disconnected.

[0048] Figure 3 (a) is an AC power supply to DC 24V circuit, and the circuit composition includes fuse F1, power module U5, common mode inductor L1, voltage-dependent resistor RM1, filter capacitor C20, filter capacitor C21, filter capacitor C22, filter capacitor C23 and diode D4. After the AC power supply is input, it is converted into DC 24V output to other modules and lower circuits by the power module U5.

[0049] Figure 3 (b) is a DC 24V to DC 5V circuit, and the circuit composition includes voltage-dependent resistor RM2, power chip U6, diode D6, inductor L4, electrolytic capacitor E1, electrolytic capacitor E2, filter capacitor C27, filter capacitor C28, filter capacitor C29, filter capacitor C30 and TVS tube D11. The DC 24V output by the upper circuit is converted into 5V by the DC-DC circuit composed of the power chip and then output to other modules and lower circuits.

[0050] Figure 3 (c) is a DC 5V to DC 3.3V circuit, and the circuit composition includes magnetic bead FB2, LDO chip U7, resistor R21, electrolytic capacitor E5, filter capacitor C25, filter capacitor C35, filter capacitor C36, TVS tube D3 and power indicator lamp LED1. The 5V output by the upper circuit is converted into 3.3V by the LDO chip and then output to other modules. The power indicator lamp LED1 and the resistor R21 form an indicator lamp circuit. When the circuit outputs 3.3V, the power indicator lamp LED1 is lit to indicate that the voltage is normally output.

[0051] Figure 3(d) is the under / over voltage protection module, the circuit composition includes the electric quantity collection chip U2, the optical coupling U54, the resistance R82, the resistance R91, the resistance R10, the resistance R11, the resistance R12, the resistance R13, the resistance R17, the capacitor C33, the capacitor C34, the capacitor C38, the capacitor C4. The voltage signal of the external input alternating current power supply is converted into ±110mV signal by the voltage dividing resistance circuit and is input into the electric quantity collection chip U2;The electric quantity collection chip U2 can read the voltage on the current power supply circuit, and real-time detection value is sent to the main control module through the serial port;When the power voltage exceeds the preset limit value (under voltage or over voltage), the main control module will know through data, and the safety locking operation is carried out.

[0052] Figure 3 (e) is the power failure detection module, the circuit composition includes the diode D41, the optical coupling U55, the resistance R145, the resistance R146, the resistance R147, the filter capacitor C40. The diode rectifies the alternating voltage;When the power is turned on, the output end of the optical coupling U55 is turned on, at this time the pull-up resistance R147 is connected to the ground at one end of the optical coupling, and low level is output to the single-chip microcomputer;When the power supply is suddenly powered off, the low level output by the optical coupling U55 disappears immediately, and the single-chip microcomputer saves the data immediately after receiving the signal, so as to prevent data loss due to sudden power failure.

[0053] Figure 4 It is a safety detection module, which continuously monitors the detection state signal output by the boiler safety chain and the burner flange switch. The circuit composition includes diode D5, optical coupling U33, resistance R20, resistance R139, resistance R74, resistance R104, filter capacitor C26. The diode D5 is connected to the optical coupling U33 after being connected to the resistance R20, the resistance R139 is connected to the optical coupling U33, the resistance R104 is connected to the optical coupling U33, the resistance R74 is connected to the optical coupling U33 and one end of the resistance R104, and the filter capacitor C26 is connected between the other end of the resistance R104 and GND;When the boiler safety chain and the flange switch are closed, the external input AC220V signal is converted into low level signal input to the main control module after being rectified and coupled by the diode, if the main control module does not detect the safety state signal input, the device will be locked and the alarm will be output.

[0054] Figure 5Reset module, its role is to receive external input reset signal. Circuit composition includes diode D39, optocoupler U34, resistor R149, resistor R178, resistor R162, resistor R12, filter capacitor C83. Diode D39 in series with resistor R149 is connected to optocoupler U34, resistor R178 is connected to optocoupler U34, resistor R162 is connected to optocoupler U34, resistor R12 is connected between optocoupler U34 and one end of resistor R162, filter capacitor C83 is connected between the other end of resistor R162 and GND. Module circuit working principle reference safety detection module, when the main control module detects reset signal input, will be reset operation on the programmer.

[0055] Figure 6 (a)- Figure 6 (d) is a flame detection module, this programmer supports the use of ion bar, ultraviolet light tube, infrared detector as flame sensor, also supports the connection of external switch input flame detector, and is configured with the corresponding signal detection circuit. Flame detection module will read the sensor flame detection signal in real time, after processing, converted into an effective signal and output to the main control module, the main control module according to the control process to determine whether the flame signal is normal, if the flame in the non normal state or disappear, then lock the device and output alarm signal.

[0056] Figure 6 (a) is an ion bar signal processing circuit. Circuit composition includes fuse F2, varistor MOV1, transformer T1, resistor R201, resistor R203, resistor R207, resistor R208, resistor R209, resistor R210, resistor R100, resistor R102, capacitor C120, capacitor C121, capacitor C122, capacitor C65, optocoupler U27, triode Q7. Transformer T1 converts the input AC220V to AC300V to drive the ion bar flame probe; because the flame has one-way conductivity, when there is flame, the ion probe, flame, shell ground form a loop, under the driving of alternating voltage, the induced current charges the electrolytic capacitor, generating an induced voltage to drive triode Q7; triode Q7 conduction will drive optocoupler U27 conduction, generating a low level signal output to the main control module, indicating that the flame has been detected.

[0057] Figure 6(b) is the signal processing circuit for the ultraviolet light tube. The circuit components include transformer T2, resistor R33, resistor R38, resistor R72, resistor R51, resistor R62, capacitor C32, capacitor C37, capacitor C5, triode Q3, and triode Q4. Transformer T2 converts DC 24V voltage into DC 350V voltage for driving the ultraviolet light tube to work. When there is a flame, photoelectric effect can generate current in the anode and cathode loop of the ultraviolet light tube, thereby generating a voltage pulse signal across the balancing resistor R4, driving the triode to turn on and output a pulse signal; when the flame disappears, the voltage pulse signal across the balancing resistor R4 disappears, at which time the triode turns off and the signal disappears.

[0058] Figure 6 (c) is the on-off signal processing circuit for the external flame detector. The circuit components include diode D34, resistor R198, resistor R149, resistor R178, capacitor C83, and optocoupler U47. The working principle of the module circuit is referred to the safety detection module. When there is a flame, the external flame detector outputs an on-off signal, and the main control module detects the flame.

[0059] Figure 6 (d) is the signal processing circuit for the infrared flame sensor. The circuit components include resistor R192, resistor R193, resistor R203, resistor R204, resistor R205, resistor R206, resistor R207, resistor R208, capacitor C112, capacitor C113, capacitor C114, capacitor C116, capacitor C117, diode TVS21, diode D38, power supply chip U49, and operational amplifier U50. The power supply chip U49 outputs a power supply voltage to drive the infrared flame sensor. When there is a flame, the infrared sensor outputs a voltage signal to the operational amplifier U50, which is processed and then output to the main control module, indicating that a flame has been detected. The main control module sends a self-check signal to the power supply chip at regular intervals to make the power supply chip output an excitation voltage to the sensor, and at the same time, the main control module reads whether the sensor outputs a response signal at this time, to determine whether the infrared sensor is working normally.

[0060] Figure 7 The storage module stores the combustion program controller and some important parameters related to the heating furnace / boiler. The circuit components include ferroelectric memory U46, resistor R15, and resistor R16, one end of each of which is connected between the ferroelectric memory U46 and the single-chip microcomputer U1. The main control module performs read / write data operations on the memory chip.

[0061] Figure 8 The communication module is used to complete data communication between the program controller and the matching hand controller or the upper computer. The communication between the program controller and the matching hand controller adopts TTL form; the communication between the program controller and the upper computer adopts RS485 form.

[0062] Figure 8 (a) is the communication circuit of the matching hand controller. The circuit components include inverter U56, current limiting resistor R85, current limiting resistor R9, electrostatic protection diode ESD1, electrostatic protection diode ESD2. The inverter is connected with the serial port UART2 of the master control module single-chip microcomputer.

[0063] Figure 8 (b) is the communication circuit of the upper computer. The circuit components include communication chip U40, configuration resistor R211, configuration resistor R212, configuration resistor R213, configuration resistor R214, configuration resistor R215, TVS tube D7, TVS tube D8.

[0064] Figure 9 It is a power interlocking / alarm output module, which functions to output an alarm signal and control the power supply of other relay groups in the program controller. The circuit components include optocoupler U8, optocoupler U36, resistor R14, resistor R22, resistor R25, resistor R103, capacitor C24, capacitor C44, relay K1, diode D9. Resistor R25 is connected to optocoupler U8, which is connected with resistor R22 and one end of capacitor C44, respectively. Diode D9 and relay K1 are connected in parallel and connected to the other end of resistor R22 and capacitor C44. Resistor R103 is connected to optocoupler U36, which is connected with resistor R14 and one end of capacitor C24, respectively. The other end of resistor R14 and capacitor C24 is connected to the other end of resistor R22 and capacitor C44. Here, a redundant optocoupler control circuit is used to control relay K1 to ensure that when one of the control circuits fails, the relay can still be controlled normally. When the program controller fails, the master control module will send a low-level signal through the corresponding pin of the single-chip microcomputer. At this time, optocoupler U8 / U36 is turned on, making relay K1 attracted. The normally open end of relay K1 is connected to the alarm output port, and the normally closed end is connected to the relay group of the program controller for power supply. When K1 is attracted, the normally closed end is disconnected, and the relay group of the program controller is powered off. At the same time, the normally open end is attracted, and the program controller outputs an alarm signal.

[0065] Figure 10The application relates to a safety valve control module which controls the on-off of a safety valve by outputting a control signal of the safety valve. The circuit composition comprises an optical coupler U10, an optical coupler U15, an optical coupler U41, resistors R31, R32, R47, R48, R50, R52, R127 and R128, capacitors C46 and C48, a relay K2, and diodes D14 and D20. The resistor R32 is connected to the optical coupler U10, one end of the resistor R31 and the capacitor C48 is connected to the optical coupler U10, the diode D14 and the relay K2 are connected in parallel to the other end of the resistor R31 and the capacitor C48; the resistor R128 is connected to the optical coupler U41, one end of the resistor R127 and the capacitor C46 is connected to the optical coupler U41, the other end of the resistor R127 and the capacitor C46 is connected to the other end of the resistor R31 and the capacitor C48; the diode D20 is connected to the optical coupler U15 after being connected in series with the resistor R48, the resistor R52 is connected to the optical coupler U15, the resistor R50 is connected to the optical coupler U15, the resistor R47 is connected between one end of the resistor R50 and the optical coupler U15, and the capacitor C53 is connected between the other end of the resistor R50 and the GND. The redundant optical coupler control circuit is used to control the relay K2, so that the system can normally work when one control circuit is disconnected. When the safety valve is opened, the main control module sends a low-level signal through the corresponding pin, the optical couplers U10 and U41 are turned on, the relay K2 is attracted, the safety valve control port connected with the normally open end of the relay outputs an opening signal. The circuit of the optical coupler U15 is used to detect the state of the relay K2, when the relay K2 is attracted, an alternating current signal is input into the optical coupler U15 to make the optical coupler U15 conduct, and a low-level signal is sent to the main control module to feedback the attracted state of the relay K2.

[0066] Figure 11The fan control module controls the start and stop of the fan by outputting the control signal of the fan. The circuit components include optocoupler U37, optocoupler U38, optocoupler U39, resistor R2, resistor R3, resistor R4, resistor R5, resistor R18, resistor R19, resistor R122, resistor R126, capacitor C31, capacitor C41, capacitor C45, relay JK9, diode D56, and diode D57. Resistor R19 is connected to optocoupler U37, one end of resistor R18 and capacitor C31 are connected to optocoupler U37 respectively, diode D56 and relay JK9 are connected in parallel to the other end of resistor R18 and capacitor C31; resistor R126 is connected to optocoupler U39, one end of resistor R122 and capacitor C45 are connected to optocoupler U39 respectively, the other end of resistor R122 and capacitor C45 are connected to the other end of resistor R18 and capacitor C31. Diode D57 is connected to optocoupler U38 after being connected in series with resistor R2, resistor R3 is connected to optocoupler U38, one end of resistor R5 is connected to optocoupler U38, resistor R4 is connected between the other end of resistor R5 and optocoupler U38, and capacitor C41 is connected between the other end of resistor R5 and GND. A redundant optocoupler control circuit is used to control relay JK9, and the working principle of the circuit is referred to the safety valve control module circuit.

[0067] Figure 12 (a)- Figure 12 (b) is a fuel valve control module, which controls the opening and closing of fuel valve V1 and fuel valve V2. Fuel valve V1 and fuel valve V2 control the delivery of burner fuel, and can perform a burner valve leak detection function by cooperating with the ignition solenoid valve.

[0068] Figure 12 (a) is the control circuit of fuel valve V1, which is composed of a control part and a feedback part, and the components include optocoupler U19, optocoupler U20, optocoupler U44, resistor R65, resistor R66, resistor R67, resistor R69, resistor R71, resistor R75, resistor R136, resistor R150, capacitor C57, capacitor C58, capacitor C68, relay K5, diode D27, and diode D28. The control part outputs the fuel valve V1 switching signal by controlling relay K5 through optocoupler, and the main control module outputs the fuel valve V1 opening signal through the corresponding single-chip microcomputer pin according to the flow, so that optocoupler U19 / U44 is turned on, relay K5 is attracted, and the port connected to fuel valve V1 outputs the valve opening signal. At this time, the feedback circuit connected to the port receives the direct current signal through diode D27, so that optocoupler U38 is turned on, and low level is sent to the main control module to feedback the attracted state of relay K5.

[0069] Figure 12(b) is the control circuit of the fuel valve V2, the circuit consists of control part and feedback part, the elements include optocoupler U22, optocoupler U24, optocoupler U45, resistor R77, resistor R78, resistor R81, resistor R84, resistor R86, resistor R87, resistor R161, resistor R162, capacitor C60, capacitor C61, capacitor C69, relay K6, diode D32, diode D33; the working principle of the control circuit is referred to the control circuit of the fuel valve V1.

[0070] Figure 13 (a)- Figure 13 (b) is the ignition control module, which controls the opening and closing of the ignition solenoid valve and the ignition transformer. The ignition transformer generates the ignition spark, and the ignition solenoid valve can perform the burner valve leak detection function by cooperating with the fuel valve.

[0071] Figure 13 (a) is the control circuit of the ignition transformer, the circuit consists of control part and feedback part, the elements include optocoupler U12, optocoupler U13, optocoupler U42, resistor R35, resistor R37, resistor R39, resistor R40, resistor R42, resistor R44, resistor R129, resistor R130, capacitor C50, capacitor C51, capacitor C66, relay K3, diode D15, diode D17; the working principle of the control circuit is referred to the control circuit of the fuel valve V1.

[0072] Figure 13 (b) is the control circuit of the ignition solenoid valve, the circuit consists of control part and feedback part, the elements include optocoupler U16, optocoupler U18, optocoupler U43, resistor R55, resistor R56, resistor R57, resistor R58, resistor R61, resistor R64, resistor R131, resistor R132, capacitor C54, capacitor C56, capacitor C67, relay K4, diode D22, diode D24; the working principle of the control circuit is referred to the control circuit of the fuel valve V1.

[0073] Figure 14For air pressure detection module, its role is to read the air pressure switch air pressure signal. Circuit composition includes diode D23, optocoupler U17, resistor R53, resistor R54, resistor R59, resistor R63, filter capacitor C55. Diode D23, resistor R53 series connection to optocoupler U17, resistor R63 is connected to optocoupler U17, resistor R59 one end is connected to optocoupler U17, resistor R54 is connected between one end of resistor R59 and optocoupler U17, filter capacitor C55 is connected between the other end of resistor R59 and GND. Diode rectifies alternating voltage; when the external air pressure switch detects air pressure, the circuit receives the external input of alternating voltage signal, at this time the output of optocoupler U17 is turned on, the pull-up resistor R54 is connected to the ground of the optocoupler, and the low level is output to the single chip microcomputer after filtering by the filter capacitor C55; the main control module judges whether the air pressure is normal according to the signal.

[0074] Figure 15 (a)- Figure 15 (b) is a gas pressure detection module, which reads the pressure signal of the gas pressure switch to realize real-time detection of whether the gas pressure is normal according to the control process.

[0075] Figure 15 (a) is a gas high pressure detection circuit, which includes diode D18, optocoupler U14, resistor R41, resistor R43, resistor R46, resistor R49, and capacitor C52. The working principle of the gas high pressure detection circuit is referred to the air pressure detection module circuit.

[0076] Figure 15 (b) is a gas low pressure detection circuit, which includes diode D13, optocoupler U11, resistor R29, resistor R30, resistor R34, resistor R36, and capacitor C49. The working principle of the gas low pressure detection circuit is referred to the air pressure detection module circuit.

[0077] Figure 16 The valve group leak detection module circuit detects whether the valve group on the gas process pipeline exists gas leakage phenomenon. The valve group leak detection module circuit includes diode D10, optocoupler U9, resistor R23, resistor R24, resistor R27, resistor R28, and capacitor C47. Diode D10 and resistor R24 are connected in series to optocoupler U9, resistor R28 is connected to optocoupler U9, resistor R27 is connected to optocoupler U9 at one end, resistor R23 is connected to optocoupler U9 and resistor R27 at one end; capacitor C47 is connected between the other end of resistor R27 and GND. The working process of the detection circuit is similar to that of the air pressure detection module circuit.

[0078] Figure 17 (a)- Figure 17(b) is an external power regulation module, which receives external input power regulation signal and regulates the power load of the burner according to the signal. The external power regulation module supports two regulation signal input modes, analog signal input regulation and switch quantity signal input regulation.

[0079] Figure 17 (a) is a switch quantity power regulation circuit, which is realized by using three groups of optical couplings. The circuit components include diode D29, diode D34, diode D37, optical coupler U21, optical coupler U23, optical coupler U25, resistor R68, resistor R70, resistor R73, resistor R76, resistor R79, resistor R80, resistor R83, resistor R88, resistor R89, resistor R90, resistor R92, resistor R93, capacitor C59, capacitor C62, and capacitor C63. The external input power regulation signal makes the optical couplings conductive after passing through the diode. The upper pull resistor R68 / R79 / R90 is connected to the ground at one end of the optical couplings. After filtering through the capacitor, a low-level signal is output to the main control module. After receiving the corresponding signal, the main control module adjusts the burner load according to the pre-set air-fuel ratio curve.

[0080] Figure 17 (b) is an analog quantity power regulation circuit, which includes operational amplifier U35, sampling resistor R142, current limiting resistor R140, filter capacitor C100, and voltage stabilizing diode D50. The external power regulation input is a 4-20mA analog current signal, which is converted into a voltage signal after passing through the sampling resistor. After filtering, the signal is input to the main control module through the following action of the operational amplifier chip.

[0081] Figure 18 (a)- Figure 18 (d) is an actuator control module, which opens all actuators to the corresponding opening degree according to the power value and control logic during the operation of the programmer. The module is composed of signal output circuit and signal input circuit to complete the control, feedback reading, and line break detection functions of the actuators by the programmer. The programmer supports two types of actuators, pulse quantity signal actuator and analog quantity signal actuator. The programmer supports a maximum of 4 actuators, and their connection methods are independent of each other, effectively avoiding the impact on other actuators when one of them fails.

[0082] Figure 18 (a)- Figure 18(c) is the pulse quantity actuator control circuit, which is composed of signal output circuit, signal feedback circuit and wire break detection circuit. The signal output circuit is composed of resistor R113, resistor R117 and optical coupler U29; the signal feedback circuit is composed of resistor R105, resistor R106 and optical coupler U28; the control signal is converted by the optical coupler and then output to the actuator, and the feedback signal converted by the optical coupler is read at the same time; the feedback signal is synchronously input to the wire break detection circuit, and the wire break detection circuit is composed of resistor R154, capacitor C74, operational amplifier U30 and diode D46; the main control module judges whether the actuator is broken by reading the signal output by the wire break detection circuit. Figure 18 (a)- Figure 18 (c) the circuit principle diagram of the one-way actuator is given, and the same circuit is adopted for the other three ways, and will not be repeatedly introduced.

[0083] Figure 18 (d)- Figure 18 (f) the analog quantity actuator control circuit is composed of signal output circuit and signal feedback circuit. The analog quantity actuator receives a 4-20mA current signal and feeds back a current signal or a resistance signal. The analog quantity actuator control circuit is composed of current output chip U31, MOS tube Q1, triode Q2, triode Q10, resistor R107, resistor R108, resistor R109, resistor R110, resistor R114, resistor R117, resistor R220, resistor R221, capacitor C76 and voltage stabilizing tube D45. The main control module controls the analog quantity actuator by converting the analog voltage signal output by the main control module into a 4-20mA current signal through the current output chip controlled by the enable signal; the feedback circuit is composed of operational amplifier U32, operational amplifier U33, sampling resistor R118, resistor R116, resistor R127, resistor R124, capacitor C75, capacitor C80, diode D44 and diode D47; the current feedback and resistance feedback signals of the actuator are respectively converted into analog voltage signals through the current sampling circuit and the resistance sampling circuit and then output to the main control module.

[0084] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model. For the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A furnace combustion program controller supporting connection of multiple actuators, characterized by, The application relates to a safety function module and a non-safety function module. The safety function module comprises a power supply function module, a safety detection module, a reset module, a flame detection module, a storage module, a master control module, a communication module, a power interlock / alarm output module, a safety valve control module, a fan control module, a fuel valve control module and an ignition control module. The non-safety function module comprises an air pressure detection module, a gas pressure detection module, a valve group leakage detection module, an external power adjustment module and an actuator control / detection module. The master control module comprises a single-chip microcomputer U1, a clock monitoring chip U28, a reference source chip U3, a RAM chip U53, a crystal oscillator Y1, a crystal oscillator Y3, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a state indicator lamp D1, a resistor R8 and a resistor R7.

2. A furnace firing process controller supporting connection of multiple actuators as recited in claim 1, wherein, The power supply function module comprises an AC power supply to DC 24V circuit, a DC 24V to DC 5V circuit, a DC 5V to DC 3.3V circuit, an under / over voltage protection module and a power failure detection module.

3. A furnace firing process controller supporting connection of multiple actuators as recited in claim 2, wherein, The safety detection module comprises a diode D5, an optical coupler U33, a resistor R20, a resistor R139, a resistor R74, a resistor R104 and a filter capacitor C26. The reset module comprises a diode D39, an optical coupler U34, a resistor R149, a resistor R178, a resistor R162, a resistor R12 and a filter capacitor C83. The flame detection module comprises an ion rod signal processing circuit, an ultraviolet light tube signal processing circuit, an external flame detector switch signal processing circuit and an infrared flame sensor signal processing circuit.

4. A furnace firing process controller supporting connection of multiple actuators as recited in claim 3, wherein, The storage module comprises a ferroelectric memory U46, a resistor R15 and a resistor R16. The communication module comprises a communication circuit of a matching hand controller and a communication circuit of an upper computer. ​ The power interlock / alarm output module includes optocoupler U8, optocoupler U36, resistor R14, resistor R22, resistor R25, resistor R103, capacitor C24, capacitor C44, relay K1, diode D9; resistor R25 is connected to optocoupler U8, optocoupler U8 is connected to resistor R22 and one end of capacitor C44 respectively, diode D9 and relay K1 are connected in parallel and to the other end of resistor R22 and capacitor C44; resistor R103 is connected to optocoupler U36, optocoupler U36 is connected to resistor R14 and one end of capacitor C24 respectively, the other end of resistor R14 and capacitor C24 is connected to the other end of resistor R22 and capacitor C44.

5. A furnace firing process controller supporting connection of multiple actuators as recited in claim 4, wherein, The safety valve control module includes optocoupler U10, optocoupler U15, optocoupler U41, resistor R31, resistor R32, resistor R47, resistor R48, resistor R50, resistor R52, resistor R127, resistor R128, capacitor C46, capacitor C48, capacitor C53, relay K2, diode D14, diode D20; resistor R32 is connected to optocoupler U10, one end of resistor R31 and capacitor C48 is connected to optocoupler U10, diode D14 and relay K2 are connected in parallel and to the other end of resistor R31 and capacitor C48; resistor R128 is connected to optocoupler U41, one end of resistor R127 and capacitor C46 is connected to optocoupler U41 respectively, the other end of resistor R127 and capacitor C46 is connected to the other end of resistor R31 and capacitor C48; diode D20 is connected to optocoupler U15 after being connected in series with resistor R48, resistor R52 is connected to optocoupler U15, resistor R50 is connected to optocoupler U15, resistor R47 is connected between one end of resistor R50 and optocoupler U15, capacitor C53 is connected between the other end of resistor R50 and GND.

6. A furnace firing process controller supporting connection of multiple actuators as recited in claim 5, wherein, The fan control module includes optocoupler U37, optocoupler U38, optocoupler U39, resistor R2, resistor R3, resistor R4, resistor R5, resistor R18, resistor R19, resistor R122, resistor R126, capacitor C31, capacitor C41, capacitor C45, relay JK9, diode D56, diode D57; resistor R19 is connected to optocoupler U37, one end of resistor R18 and capacitor C31 is connected to optocoupler U37 respectively, diode D56 and relay JK9 are connected in parallel and to the other end of resistor R18 and capacitor C31; resistor R126 is connected to optocoupler U39, one end of resistor R122 and capacitor C45 is connected to optocoupler U39 respectively, the other end of resistor R122 and capacitor C45 is connected to the other end of resistor R18 and capacitor C31; diode D57 is connected with optocoupler U38 after being connected in series with resistor R2, resistor R3 is connected with optocoupler U38, one end of resistor R5 is connected with optocoupler U38, resistor R4 is connected between one end of resistor R5 and optocoupler U38, capacitor C41 is connected between the other end of resistor R5 and GND.

7. A furnace firing process controller supporting connection of multiple actuators as recited in claim 6, wherein, The fuel valve control module includes a control circuit of fuel valve V1 and a control circuit of fuel valve V2.

8. A furnace firing process controller supporting connection of multiple actuators as recited in claim 7, wherein, The ignition control module includes a control circuit of an ignition transformer and a control circuit of an ignition solenoid valve. The air pressure detection module includes a diode D23, an optical coupler U17, resistors R53, R54, R59, R63, and a filter capacitor C55; the diode D23 and the resistor R53 are connected in series and then connected to the optical coupler U17, the resistor R63 is connected to the optical coupler U17, one end of the resistor R59 is connected to the optical coupler U17, the resistor R54 is connected between one end of the resistor R59 and the optical coupler U17, and the filter capacitor C55 is connected between the other end of the resistor R59 and the GND.

9. A furnace firing process controller supporting connection of multiple actuators as recited in claim 8, wherein, The gas pressure detection module includes a gas high-pressure detection circuit and a gas low-pressure detection circuit. The valve group leak detection module circuit includes a diode D10, an optical coupler U9, resistors R23, R24, R27, R28, and a capacitor C47; the diode D10 and the resistor R24 are connected in series and then connected to the optical coupler U9, the resistor R28 is connected to the optical coupler U9, one end of the resistor R27 is connected to the optical coupler U9, the resistor R23 is connected to the optical coupler U9 and one end of the resistor R27, and the capacitor C47 is connected between the other end of the resistor R27 and the GND.

10. A furnace firing process controller supporting connection of multiple actuators as recited in claim 9, wherein, The external power regulation module includes a switching power regulation circuit and an analog power regulation circuit; and the actuator control module includes a pulse actuator control circuit and an analog actuator control circuit.

Images