1. Ejector
In atmospheric burners, the gas stream is typically used to entrain air from the surrounding atmosphere. This is achieved through a constant-pressure suction, low-pressure ejector tube. Structurally, it can be divided into three sections: the intake section, the throat, and the mixing section.
Its functions are as follows:
1) To use the high-energy gas stream to entrain lower-energy atmospheric air, and to ensure that the two are thoroughly mixed within the ejector.
2) To maintain a specific pressure within the mixing chamber, overcome resistance losses within the flow channels, and generate a specific exit velocity at the burner ports, thereby ensuring the stability of the combustion flame.
3) To deliver a specific volume of gas, thereby ensuring the burner meets its required thermal output.
2. Air Damper
Typically positioned at the primary air intake of the ejector, this component is also known as the primary air regulator. Its purpose is to ensure that the volume of primary air meets the required specifications. By adjusting the damper, the intake volume of primary air can be controlled, thereby establishing the appropriate ratio between the gas and the entrained air, and ensuring normal, stable combustion.
3. Nozzle
As one of the critical components of a gas burner, the nozzle's primary function is to inject the combustible gas into the ejector, where it mixes with the air in a specific ratio prior to combustion. The design of the nozzle is contingent upon factors such as the gas source, the required thermal output, and the air-entrainment capacity of the system. Specifically, the diameter of the nozzle orifice is determined by the type of gas source and the magnitude of the thermal output; different gas sources necessitate different nozzle structures and orifice sizes. Generally speaking, a fixed nozzle is designed for use with only one specific type of gas source. Consequently, if the gas source is changed, the nozzle must be replaced; otherwise, normal combustion cannot be sustained.
4. Burner Head
Also referred to as the burner body, this component is typically integrated directly with the ejector. When a burner cap is placed atop the burner head, the assembly constitutes the complete burner head unit. The primary function of the burner head is to distribute the gas-air mixture uniformly across the burner ports.
5. Burner Cap
The surface of the burner cap is perforated with an array of burner ports—typically rectangular or circular in shape—arranged along its circumference. When fitted onto the burner head, these ports collectively form the combustion outlets. After the gas and air have mixed within the ejector in the appropriate ratio, the mixture exits through these burner ports. Upon contact with an ignition source (such as a pilot flame), the mixture ignites; it then mixes further with the surrounding atmospheric air (known as "secondary air") to ensure complete combustion of the gas and to maintain a stable flame. 6. Burner Ports
The fundamental requirements for burner ports are twofold: in addition to ensuring the complete combustion of the gas discharged from the nozzle, they must also ensure that the shape and characteristics of the resulting flame are suitable for the specific operating conditions. To meet these requirements, burners may utilize various types of ports depending on the intended application; common port shapes include circular, square, trapezoidal, and rectangular forms.
1. Ejector
In atmospheric burners, the gas stream is typically used to entrain air from the surrounding atmosphere. This is achieved through a constant-pressure suction, low-pressure ejector tube. Structurally, it can be divided into three sections: the intake section, the throat, and the mixing section.
Its functions are as follows:
1) To use the high-energy gas stream to entrain lower-energy atmospheric air, and to ensure that the two are thoroughly mixed within the ejector.
2) To maintain a specific pressure within the mixing chamber, overcome resistance losses within the flow channels, and generate a specific exit velocity at the burner ports, thereby ensuring the stability of the combustion flame.
3) To deliver a specific volume of gas, thereby ensuring the burner meets its required thermal output.
2. Air Damper
Typically positioned at the primary air intake of the ejector, this component is also known as the primary air regulator. Its purpose is to ensure that the volume of primary air meets the required specifications. By adjusting the damper, the intake volume of primary air can be controlled, thereby establishing the appropriate ratio between the gas and the entrained air, and ensuring normal, stable combustion.
3. Nozzle
As one of the critical components of a gas burner, the nozzle's primary function is to inject the combustible gas into the ejector, where it mixes with the air in a specific ratio prior to combustion. The design of the nozzle is contingent upon factors such as the gas source, the required thermal output, and the air-entrainment capacity of the system. Specifically, the diameter of the nozzle orifice is determined by the type of gas source and the magnitude of the thermal output; different gas sources necessitate different nozzle structures and orifice sizes. Generally speaking, a fixed nozzle is designed for use with only one specific type of gas source. Consequently, if the gas source is changed, the nozzle must be replaced; otherwise, normal combustion cannot be sustained.
4. Burner Head
Also referred to as the burner body, this component is typically integrated directly with the ejector. When a burner cap is placed atop the burner head, the assembly constitutes the complete burner head unit. The primary function of the burner head is to distribute the gas-air mixture uniformly across the burner ports.
5. Burner Cap
The surface of the burner cap is perforated with an array of burner ports—typically rectangular or circular in shape—arranged along its circumference. When fitted onto the burner head, these ports collectively form the combustion outlets. After the gas and air have mixed within the ejector in the appropriate ratio, the mixture exits through these burner ports. Upon contact with an ignition source (such as a pilot flame), the mixture ignites; it then mixes further with the surrounding atmospheric air (known as "secondary air") to ensure complete combustion of the gas and to maintain a stable flame. 6. Burner Ports
The fundamental requirements for burner ports are twofold: in addition to ensuring the complete combustion of the gas discharged from the nozzle, they must also ensure that the shape and characteristics of the resulting flame are suitable for the specific operating conditions. To meet these requirements, burners may utilize various types of ports depending on the intended application; common port shapes include circular, square, trapezoidal, and rectangular forms.