CN217763412U - Precision detection execution control system of combustion heat exchanger - Google Patents

Abstract

The utility model discloses a precise detection and execution control system for a combustion heat exchanger. The product is provided with an air inlet hole, a gas inlet hole and a mixed gas outlet on an air-fuel mixed air inlet device; One end is provided with a mixed gas inlet, and the other end is provided with a smoke exhaust port. The air outlet joint of the exhaust fan is sealed with the mixed gas inlet, and the air inlet of the exhaust fan is sealed with the mixed gas outlet of the air-fuel mixed air intake device. A controller is connected through a wire; a gas switch valve is connected to the gas inlet hole, and the gas switch valve is connected to the controller through a wire; an air flow detection device is fixed on the cross section of the air inlet hole, and the air flow detection device is connected with the wire through the wire. The controller is connected. When the controller detects the intake air volume lower than the set value through the air flow detection device, it means that the smoke exhaust and exhaust air are not smooth, and there is an abnormal situation. The controller at least controls to close the gas switch valve to prevent hypoxia mixing Gas and prevent gas leakage, eliminate the hidden danger of burning.

Description

A precision detection and execution control system for a combustion heat exchanger

technical field

The utility model relates to a combustion detection execution device of a gas heating water heater and a gas water heater, in particular to a precise detection execution control system of a combustion heat exchanger.

Background technique

1. The current combustion control is based on the speed feedback of the fan when it is running as the judgment standard for the operation of the whole machine. If the air inlet or smoke outlet is accidentally blocked, the controller detects that the fan is still running normally and the flame sensor When the device cannot detect the flame, it will continue to issue ignition commands, which is prone to dangerous conditions such as ignition failure and deflagration.

2. The current operation mode adopted by the fully premixed condensing gas heating bath dual-purpose furnace and water heater is that the frequency conversion fan and the gas switch proportional regulating valve input oxygen and gas pre-mixed at the same time according to the control ratio, and the electronic igniter ignites the mixed gas to burn and discharge. In hot operation, the oxygen supply fan is a variable frequency speed regulating fan, which operates to input air according to the execution instructions issued by the controller, and the gas proportional valve opens the switch valve according to the negative pressure generated by the fan operation and adjusts the input gas volume. This premixed combustion control method The disadvantages are: A. The fan speed is operated under a fixed program instruction, and there is no detection and execution change for the quality of the input air, which will easily cause the oxygen concentration in the mixed gas to be too high or too low, and a large amount of nitrogen will be produced if the oxygen concentration is too high If the oxygen concentration is too low, a large amount of carbon monoxide will be produced; B. The adjustment of the gas proportional valve is to open the size of the input aperture and the input gas volume according to the negative pressure generated by the operation of the fan. The detection and implementation standards cannot be adapted to the combustion conditions in real time, and it is easy to cause failures such as mixture ratio imbalance, low ignition success rate, flameout, deflagration, and excessive emissions.

Utility model content

In order to solve the above technical problems, the utility model provides a reasonable structure, simple setting, low cost, the controller detects the air input flow in real time through the air flow detection device, when the air intake is lower than the set value, the controller shuts down the whole machine and stops Work, to ensure the use of gas safety combustion heat exchanger precision detection implementation control system.

The technical scheme that solves the above-mentioned technical problem is:

A precision detection and execution control system for a combustion heat exchanger, including a combustion heat exchanger body, an input air fan, and an air-fuel mixed intake device. The air-fuel mixed intake device is provided with air inlet holes, gas inlet holes, and mixed gas Gas outlet; one end of the combustion heat exchanger is provided with a mixed gas inlet, the other end is provided with a smoke outlet, the air outlet joint of the exhaust fan is sealed with the mixed gas inlet, and the air inlet of the exhaust fan is connected with the air-fuel mixed air intake device The air outlet of the mixed gas is sealed and connected, the fan is connected to a controller through a wire, the gas inlet hole is connected to a gas switch valve, and the gas switch valve is connected to the controller through a wire; the cross section of the air inlet hole is fixed with an air flow detection device, the air flow detection device is connected to the controller through wires, and when the controller detects an air intake lower than the set value through the air flow detection device, the controller at least controls to close the gas on-off valve.

The beneficial effects of a combustion heat exchanger of the utility model are as follows: the product is mainly fixed with an air flow detection device on the cross section of the air inlet hole, the air flow detection device is connected to the controller through a wire, and the working flow value is set by the controller , when the controller detects an air intake lower than the set value through the air flow detection device, it means that the smoke exhaust and air exhaust are not smooth, and there is an abnormal situation. The controller closes the gas inlet to prevent anoxic mixed gas and gas leakage Eliminate combustion safety hazards.

Description of drawings

Fig. 1 is the structural representation of the utility model product;

Fig. 2 is a sectional view of the air-fuel mixed intake device of the utility model product;

Fig. 3 is a perspective view of the air-fuel mixed intake device of the utility model.

Combustion heat exchanger 1, mixed gas inlet 11, smoke outlet 12, exhaust fan 2, air-fuel mixed inlet device 3, air inlet hole 31, gas inlet hole 32, gas switch valve 321, mixed gas outlet 33, control Device 4, air flow detection device 5, oxygen sensor 6, air gas premix chamber 301, air conditioning motor 3A, air flow regulating valve plug 3A1, gas regulating motor 3B, gas flow regulating valve plug 3B1.

Detailed ways

A combustion control system for a combustion heat exchanger, comprising a combustion heat exchanger 1 body, an exhaust fan 2, an air-fuel mixed intake device 3, and the air-fuel mixed intake device 3 is provided with an air inlet hole 31 and a gas inlet hole 32 , mixed gas outlet 33; Combustion heat exchanger 1, blower fan 2 are prior art; Air-fuel mixed intake device 3 can be prior art, also can be following specific structure, is not limited to shape and structure; One end of the combustion heat exchanger 1 is provided with a mixed gas inlet 11, and the other end is provided with a smoke exhaust port 12. The air outlet joint of the exhaust fan 2 is sealed and connected with the mixed gas inlet 11, and the air inlet of the exhaust fan 2 is mixed with air and fuel. The mixed gas outlet 33 of the gas device 3 is sealed and connected, the exhaust fan 2 is connected with a controller 4 through an electric wire, the gas inlet hole 32 is connected with a gas on-off valve 321, and the gas on-off valve 321 is connected with the controller 4 through an electric wire; Air flow detection device 5 is fixed on the cross section of air inlet hole 31, and air flow detection device 5 is connected with controller 4 by electric wire, and when controller 4 detects the air intake rate lower than the set value by air flow detection device 5, control The device at least closes the gas on-off valve 321; this is to prevent anoxic mixed gas from entering combustion and prevent gas leakage, eliminate combustion safety hazards, and realize the required basic functional structure.

work process:

When the combustion heat exchanger 1 is working normally for combustion and heat exchange, the exhaust fan 2 is working normally, and the air-fuel mixed intake device 3 is entering the gas normally, it means that the machine is working normally; the manufacturer sets the working flow value through the controller before leaving the factory , when the controller 4 detects an air intake lower than the set value through the air flow detection device 5, the controller 4 judges that the smoke exhaust and exhaust air are not smooth or proves that the air intake is not smooth under the machine running state, and the controller 4. It is determined that there is an abnormal situation in the operation of the machine. Therefore, the controller should close the gas on-off valve 321 to prevent the machine from entering the combustion of the oxygen-deficient mixed gas and prevent the gas from leaking, so as to eliminate the hidden danger of combustion safety.

Further: the controller 4 controls the exhaust fan 2 to stop working and closes the gas switch valve 321, the ignition needle of the combustion heat exchanger, and the flame detection needle of the combustion heat exchanger, so as to shut down the machine reasonably and enter the standby state. The whole machine is powered off, and it can be used only after being restarted manually.

Further: the air flow detection device 5 is an air flow sensor.

Further: Connect the gas output pipe to the gas output end of the gas switch valve and insert it into the air inlet hole to replace the above gas inlet hole.

Further: the aerobic sensor 6 is fixedly installed in the air cavity of the exhaust fan 2, and the manufacturer sets the oxygen content value of the air cavity of the exhaust fan 2 through the controller before leaving the factory. When the oxygen content is lower than the set value, the controller 4 judges that the air intake is not smooth when the machine is running. It may be that the smoke exhaust or the air intake is blocked, which cannot meet the mixed combustion conditions of gas and air. Therefore, the controller 4 judges The machine is running abnormally, so the controller should close the gas on-off valve 321, exhaust fan 2, the ignition pin of the combustion heat exchanger, the flame detection pin of the combustion heat Leakage, eliminating potential combustion safety hazards.

Further: the air-fuel mixing intake device 3 is a housing for premixing air and gas, and an air and gas premixing chamber 301 and an air and gas premixing outflow channel are arranged inside the housing, and the air and gas premixing chamber 301 is set At one end of the housing, the other end of the housing is provided with a mixed gas outlet 33, and between the mixed gas outlet 33 and the air and gas premixing chamber 301 is an air and gas premixed outflow channel; on the side of the air and gas premixing chamber 301 The walls are respectively provided with air inlet holes 31 and gas inlet holes 32; the air and gas premix chamber 301 is used for premixing after air and gas enter.

Further: the smoke exhaust port 12 is provided with a post-combustion oxygen detection sensor, which is connected to the controller through a wire; an air conditioning motor 3A is installed on the housing wall directly opposite the air inlet hole 31, and the air The motor shaft of the regulating motor 3A extends into the air and gas premixing chamber 301 and an air flow regulating valve plug 3A1 is fixedly installed on the shaft end, and the air flow regulating valve plug 3A1 is centered on the air inlet hole 31;

A gas regulating motor 3B is installed on the housing wall directly opposite the gas inlet hole 32, the motor shaft of the gas regulating motor 3B extends into the air and gas premixing chamber 301 and a gas flow regulating valve plug 3B1 is fixedly installed on the shaft end, The gas flow regulating valve plug 3B1 is centered on the gas inlet hole 32 .

According to the firepower required by the combustion heat exchanger and the oxygen content value fed back by the oxygen detection sensor after combustion, the controller 4 controls the air-conditioning motor 3A and the gas-conditioning motor 3B to coordinate the ratio of gas and air entering the two, and adjust the mixture concentration in real time , to achieve full combustion.

The precise detection and execution control system of the combustion heat exchanger is the precise detection and execution control system of the premixed condensing combustion heat exchanger.

Claims (6)

1. A precise detection execution control system of a combustion heat exchanger comprises a combustion heat exchanger body, an exhaust fan and an air-fuel mixed air inlet device, wherein an air inlet hole, a fuel gas inlet hole and a mixed gas outlet are formed in the air-fuel mixed air inlet device; one end of the combustion heat exchanger is provided with a mixed gas inlet, the other end of the combustion heat exchanger is provided with a smoke outlet, an air outlet connector of the exhaust fan is hermetically connected with the mixed gas inlet, an air inlet of the exhaust fan is hermetically connected with a mixed gas outlet of the air-fuel mixed air inlet device, and the exhaust fan is connected with a controller through an electric wire; the gas inlet hole is connected with a gas switch valve, and the gas switch valve is connected with the controller through an electric wire; the method is characterized in that: an air flow detection device is fixed on the cross section of the air inlet hole and connected with a controller through an electric wire, and when the controller detects the air inlet amount lower than a set value through the air flow detection device, the controller at least controls the gas switch valve to be closed.

2. The precision inspection execution control system of a combustion heat exchanger as set forth in claim 1, wherein: the air flow detection device is an air flow sensor.

3. The precision inspection execution control system of a combustion heat exchanger as set forth in claim 1, wherein: an oxygen sensor is fixedly arranged in the air cavity of the exhaust fan.

4. A precision inspection execution control system of a combustion heat exchanger according to any one of claims 1 to 3, characterized in that: the air-fuel mixing air inlet device is a shell for premixing air and fuel gas, an air-fuel gas premixing cavity and an air-fuel gas premixing outflow channel are arranged in the shell, the air-fuel gas premixing cavity is arranged at one end of the shell, a mixed gas outlet is arranged at the other end of the shell, and the air-fuel gas premixing outflow channel is arranged between the mixed gas outlet and the air-fuel gas premixing cavity; an air inlet hole and a fuel gas inlet hole are respectively formed in the side wall of the air and fuel gas premixing cavity.

5. The system for performing a precision inspection of a combustion heat exchanger as set forth in claim 4, wherein: an air conditioning motor is arranged on the wall of the shell body opposite to the air inlet hole, a motor shaft of the air conditioning motor extends into the air and gas premixing cavity, an air flow adjusting valve plug is fixedly arranged at the shaft end, and the air flow adjusting valve plug is aligned to the air inlet hole in the center;

and a gas regulating motor is arranged on the wall of the shell opposite to the gas inlet hole, a motor shaft of the gas regulating motor extends into the air and gas premixing cavity, a gas flow regulating valve plug is fixedly arranged at the shaft end, and the gas flow regulating valve plug is aligned to the gas inlet hole in the center.

6. The system for performing a precision inspection of a combustion heat exchanger as set forth in claim 1, wherein: and the controller controls the exhaust fan to stop working and closes the gas switch valve.

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