The so-called "downward wind" refers to the structure of the "downward wind" that enters the air premixed with the gas when the cooker is burning from below the cooktop. The stove has the characteristics of concentrated firepower, high heat load, complete combustion, high thermal efficiency, and the inner ring fire of the burner (commonly known as small fire) can be used alone, so it is widely used in ordinary desktop gas stoves. At present, some embedded gas stoves on the market also adopt this structure. Since the air when the cooker is working is obtained from the lower part of the cooktop, if the embedded cooker is mounted on a closed cabinet, the cooker may not be sufficiently aired due to the non-ventilation. Therefore, the cabinet should not be too tightly closed, and a proper vent (slot) is required to allow air to enter the lower part of the cooker. "Upward wind" means that the mixed air enters from the upper part of the cooker when it is burning, and is characterized by being unaffected by the lower part of the cooktop. The stove has a large burner area and a large flame distribution area, but the burner has insufficient fire power and low thermal efficiency. However, with the continuous upgrading of technology, the complete gas stove has solved these problems, and the combustion is more complete and safer to use. The burner designed according to the principle of atmospheric combustion has good stability, large heat flow adjustment range, is not easy to temper, has high de-ignition limit and has the characteristics of general atmospheric burner. Also: a , the content of carbon monoxide in the flue gas is low, clean without black smoke, no carbon at the bottom of the pot; b , cancel the air volume regulator, can automatically adjust the air air volume with the change of gas volume; c , mainly The air is introduced from the side of the gas burner on the upper side of the cooker to the primary air passage, and the fire power is uniform; d , convenient for disassembly and easy to clean. The burner is composed of a lower shell, an ejector, a main body, a fire cover, a decorative ring, a nozzle, and the like ( see figure ) . Below the outer edge of the outer ring fire cover, the outer surface of the outer cylindrical surface of the main body is inclined at an angle Î± along the horizontal direction, uniformly distributed with a trapezoidal, circular or rectangular fire hole; the outer ring of the inner ring fire cover, the inner ring of the main body The upper part of the cylinder is inclined at a Î² angle along the horizontal direction, and a circular circular fire hole is evenly distributed. The upwardly inclined fire hole is arranged so that the burner does not overheat when the flame is burned, and it is easy to mix the secondary air to assist combustion. A circular vertical fire hole is evenly distributed on the top of the inner ring of the main body. The gas emitted from the fire-proof hole flows out through the gap between the inner ring fire cover and the top of the main body, thereby functioning as a flame for the inner ring to prevent fire. The igniter is the core part of the burner, and is vertically arranged at the center of the burner coaxially with the center of the nozzle, and the suction port section is perpendicular to the nozzle axis, and the function is to mix the gas emitted from the nozzle with the primary air introduced by the suction port. The gas mixture is delivered to the gas supply passage and sent to the fire hole. The decorative circle can also be called â€œfire ringâ€ to separate the hot smoke flow from the cold air flow, so that the cold air can be sucked into the next air intake passage of the decorative ring, without being affected by the hot smoke flow in the upper part of the decorative ring. interference. A secondary air duct located in the lower casing of the burner provides secondary air for the combustion flame. The air flow from the bottom of the pan to the surface space above the fire cover also provides secondary air to the flame. When the gas is under a certain pressure, it is ejected from the nozzle at a certain speed and enters the ejector. The pressure around the gas inlet of the ejector is lower than the external pressure to form a negative pressure. The surrounding air is automatically sucked into the ejector through the suction port of the four primary air intake passages of the burner, and is quickly mixed with the gas to form a certain Proportional, vertically upward mixed gas flow, while mixing, aspirating. First, supply air to the nearest inner ring fire hole, and then supply air to the outer ring fire hole through four air supply channels distributed in the main body. The mixed gas flows out from the fire hole at a certain angle, and is ignited by the igniter. A uniform inner and outer double ring blue flame is formed. And relying on the decorative ring to separate the hot and cold airflow, it is convenient to introduce one air and gas mixture in one air inlet channel under the decorative ring, and also to introduce secondary air from the secondary air guiding channel under the decorative ring, and distribute the flame to the combustion, twice The circulation of air can also reduce the temperature inside the stove. For example, a residential area in a city uses concentrated supply of liquefied petroleum gas and air mixture, and specifies the use of natural gas stoves. When using the natural gas on the air into the stove and pressing the hand button to ignite, the fire can only ignite 1 / 6 , most of the fire holes are off fire, and the flames are all extinguished after raising the hand. Investigation: The neighbors who used the gas inlet gas stove adjusted the damper and burned normally. Analysis: The mixture ratio is inconsistent with the local natural gas whiteness and combustion potential, and the air ratio is large. The air is injected too much, and the burning speed is lower than the airflow speed, so the fire is removed. Maintenance content: Change the pot type nozzle, the height of the nozzle is 5mm higher than the original nozzle, the combustion is normal during use, and the carbon monoxide is qualified. After raising the nozzle, the amount of air ejector is reduced, and the combustion speed is balanced with the airflow speed.
Recommendation: The upper inlet burner should be designed according to the local gas source, the composition of the gas source, and the pressure change should be improved.
When the upper inlet combustion design is reasonable, each fire hole emits a blue flame with a slanting upward direction, the inner and outer flames are clear, and the flame is short and powerful. Otherwise, it will cause dislocation and tempering, yellow flame and other abnormal combustion conditions, in the smoke. Harmful gases will increase rapidly.
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