burner
1) There are two burner modes commonly used in domestic gas stoves: partial premixed combustion and fully premixed combustion.
2) Burner head The burner head functions to uniformly distribute the gas and air mixture gas to each of the fire holes for stable and complete combustion. For this reason, it is required that the pressure of the mixed gas at each point of the head is almost equal, and the secondary air can be uniformly supplied to each of the fire holes. In addition, the head volume should not be too large, otherwise it will easily generate flameout noise.
Depending on the application of the atmospheric burner, it can be made into multiple firehead heads and single firehead heads.
Most of the civil burning appliances use a multi-fired head, which has many forms. When designing the burner head, factors such as the form, size, number of holes, and arrangement of the fire holes should be fully considered. These factors are not determined solely by the burner, but are determined by factors such as the size and shape of the object to be heated and the size of the combustion chamber depending on the application. Commonly used fire holes have the following shapes:
1 round fire hole: the fire hole in the burner head is drilled with a drill bit. This form of processing is simple and widely used.
2 square fire hole (torch shaped fire hole or trapezoidal fire hole): There are two ways of lengthwise and horizontal length.
3 gap fire hole: When processing the fire hole, replace the drill bit with a cutter and process it into a slender groove. This fire hole is called a gap fire hole.
Ignition device
1) Piezoelectric ceramic igniter
Piezoelectric ceramic ignition is mainly used in some old-fashioned desktop gas stoves, and now the better gas stoves no longer use this ignition method. Piezoelectric ceramics are a special material that generates high-voltage electrical energy by mutual impact under pressure and breaks through the electrode gap to form an electric spark. However, this ignition mode can only be injected once by a single button, so the success rate of ignition is relatively low. At about 70%, the national standard piezoelectric igniter has an effective number of presses of 100,000 times.
2) Pulse electronic igniter
The electric pulse ignition method needs to install a battery at the bottom of the gas stove, or external power supply, and its ignition success rate is very high, generally more than 90%. Because it only needs you to twist the button once, it can continuously eject the spark until it ignites. The pulse igniter produces a pulse voltage of 10KV, but the current is small and does not harm people.
Fire cover of the cooker
The fire cover is one of the core components of the gas stove. The material of the fire cover and the design of the fire hole are very important. At present, the material of the domestic gas stove fire cover is mostly copper alloy, but the copper alloy is also divided into two types. One is cabinet-mounted brass with a copper content of about 53%, which is the material used by most domestic enterprises and some cottage factories. The other is a non-standard brass with a copper content of 57%. This copper alloy is tens of dollars more expensive than cabinet brass, so the quality is better. Domestically, some professional cooker brands use this type of non-standard brass alloy. As for which kind of brass, you can't see it in the naked eye. Non-professionals are also unlikely to know this at all. There are many fire holes in the fire cover. However, there are mainly round holes, trapezoids, rectangles, strips, and the like. The round hole shape is the first generation of fire cover, which has been used for a long time. It is more common and easy to block. It is often necessary to remove the impurities in the fire hole with a toothpick or a needle to avoid burning the fire cover. Trapezoidal is still relatively rare. The strip fire hole is generally more efficient and has a higher power than other fire holes. It is more suitable for Chinese people to cook, blast, simmer and other cooking habits.
Flameout protection device
The flameout protection device is used in the gas stove due to accidental flameout (such as boiling water overflow during cooking), the gas stove automatically shuts off the air source to ensure your safety, mainly divided into thermoelectric and ion sensing. Now the country has mandatory requirements for gas stoves to be extinguished, so there is no flameout protection device, you should never buy.
Thermoelectric type: The principle that a thermocouple is used to sense the temperature and a thermoelectric potential is generated to open and close the solenoid valve. The flameout protection device is a set of thermocouples and solenoid valves that only control one air passage. The safety factor is high: if one of them is damaged, it will not affect the normal use of the other burner. It is stable and reliable, and generally does not require an external power supply. . However, it has a certain thermal inertia, so that the current output by the thermocouple can not disappear immediately with the flame extinguishing, and the reaction to the accidental flameout is slow. Generally, it takes about 5-10s to shut off the gas valve, but this leakage will not cause Any security issues. At present, the stoves of most brand manufacturers are selected in this way, and the flameout protection device produced by Spain 0KALI company is the most stable.
Ion Inductive: It is mainly invented by the principle of unidirectional conductivity with electric ions in the flame (the flame is equivalent to a section of wire). The advantage of this method is that the gas is cut off quickly. However, it can only be applied to a single air passage. The air passage after the protection device can no longer be separated, otherwise it will cause malfunction due to malfunction. Therefore, if the flameout protection device is damaged, the entire stove cannot be used, and secondly, external connection is required. Power supply, power consumption is large, usually need to change the battery once in 2-3 months.
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