Applying the unique phenomenon and characteristics of tornado (also known as cyclone) in nature to the range hood, so that all the fumes produced during cooking are sucked clean by the cyclone range hood on the stove. The engineering and technical personnel of the stove industry introduced the main structural features and suction principle of the two cyclone range hoods in detail, and theoretically solved the defects of the current exhaustion of all types of range hoods. The harm of oil fume to the human body. The formation of the existing range hood is based on the idea of ​​seeking a cost-effective way to prevent the escape of soot by using the negative pressure zone of the axial column-shaped active range smear formed near the suction port of the fan, that is, the axial suction as the base point. Passive occlusion, control surface. Based on the above design ideas, the most typical is the plate type range hood (such as "ultra-thin range hood", "European range hood". When the soot is sucked, the rising soot blocked by its horizontal baffle is still laterally Dissipation. Only the fumes that escape to the suction port can be sucked away. In order to prevent the fumes blocked by the horizontal shielding baffle from escaping again laterally, the existing improvement is to form a circular baffle in the vertical direction (such as “Sub-deep range hood†and “deep-cavity range hoodâ€. Although most of the hooded soot can be sucked away, because the hood is far away from the source of the oil smoke (according to the installation standard, generally 650~700mm from the cooktop), there are still many soots that dissipate quickly. In order to solve the problem that the soot is not completely exhausted, people think a lot of ways. For example, in the vicinity of the plate type range hood, the fan is blown or sucked along the periphery, in an attempt to form an air curtain and cover the soot. Although the effect is improved, it is obviously uneconomical to increase the number of fans several times. Another example is to install a fan on the stove to blow up, guiding the soot to rise instead of spreading around. However, the upward rising airflow cannot form a negative pressure zone. Although it can make the soot rise rapidly, it accelerates the dissipating speed of the soot, which is not worth the loss. For example, if the range hood is lowered under the eyes and eyes of the person, in order not to block the line of sight, the range hood should be tilted upward (such as "side suction range hood"), so that the suction port of the range hood Can not directly face the source of soot, weakening the suction effect. The above-mentioned range hood has the disadvantage that the range hood (installation) works on the eyes and nose of the person, and the damage of the oil smoke to the human body cannot be avoided. More importantly, the smoke can not be completely sucked up due to the escape effect. . The reason for the above defects is that the existing range hoods use a limited axial negative pressure region to suck the soot, and the active suction radius is equivalent to the diameter of the suction port, and the suction effect is limited. A tornado is a vortex: the air rotates rapidly around the axis of the tornado, and is attracted by the extremely reduced atmospheric pressure at the center of the tornado. In a thin layer of air that is tens of meters thick near the ground, the airflow is drawn into the bottom of the vortex from all directions. And then it becomes a vortex around the axis. The wind in the tornado is always cyclonic, and the air pressure in the center can be 10% lower than the surrounding air pressure. Second, the formation of the tornado in the form of a hood can be divided into four stages: the instability of the atmosphere produces a strong updraft, which is further strengthened by the influence of the maximum transit airflow in the rapids. Due to the wind interaction with the shear velocity in both the vertical direction and the direction, the ascending airflow begins to rotate in the middle of the troposphere, forming a mesoscale cyclone. As the mesoscale cyclone develops toward the ground and stretches upward, it becomes thinner and stronger. At the same time, a small area of ​​enhanced auxiliary, that is, the birth of the tornado inside the cyclone, the same process of generating a cyclone, forming the core of the tornado. The rotation in the core of the tornado is different from that in the cyclone, and its strength is sufficient to allow the tornado to extend all the way to the ground. When the developed vortex reaches the ground level, the ground pressure drops sharply, and the ground wind speed rises sharply, forming a tornado. III. Structure and characteristics In order to make the range hood produce swirling effect, some people have improved and innovated the range hood. Among them, two typical cyclone range hoods have certain practical value. One is to install a device capable of generating a cyclone on the existing range hood; the other is a new type of cyclone range hood. structure. The following are introduced separately: the installed structure and features (see) This cyclone structure includes the components of the conventional range hood: the casing part 1, the fan system 2, the V-type filter assembly 3, the oil cup 9, etc. A cyclone assembly is additionally installed. 4. The assembly is located below the V-shaped filter assembly 3, and is composed of an air suction pipe 7 and an axial flow impeller 8; a regularly distributed suction hole or slit 10 is arranged on the wall of the suction pipe; The suction pipe 7, the axial flow impeller 8 and the axis of the centrifugal system impeller 11 of the fan system are located on the same axis; the suction pipe 7? end is fixed at the lower part of the V-shaped filter assembly 3, and the other end is provided with a lifting oil cup 9; The axial flow impeller 8 is fixedly connected with the centrifugal impeller 11 of the fan system, and penetrates into the suction pipe 7; it rotates synchronously with the centrifugal impeller, and sends part of the soot flow analyzed by the suction hood around the suction pipe 7 to the fan system. 2 in the wind. In practical application, the range hood can adopt the double fan structure, the fan above the steamer can use the common centrifugal fan, and the fan above the wok is equipped with the cyclone component, and it is located in the center of the wok, and the suction pipe is about the distance from the wok. 10~60 cm, the best distance is about 30 cm. The soot produced by such cooking leaves the periphery of the suction pipe without being sufficiently mixed with air after leaving the wok for a short distance, and the air flow distribution is as indicated by the middle arrow line 12. As can be seen from the above, the cyclone range hood actually comprises two main and auxiliary fan systems, wherein the main fan system is a centrifugal fan similar to a conventional range hood, and the auxiliary fan system is an axial fan with a relatively small suction air volume. It is mounted vertically below the centrifugal fan and rotates coaxially therewith. Therefore, the rational design of the main suction holes or gaps creates a swirling airflow around the suction pipe, similar to a tornado in natural phenomena. The soot is more difficult to spread laterally, and the suction effect is better. In addition, the cyclone range hood is easier to clean: because most of the soot is passed through the suction pipe and the axial fan before entering the main fan, a considerable part of the soot will be captured and condensed by the suction pipe, reducing the pollution of the main fan; The disassembly and cleaning of the suction duct is relatively convenient, or the angle between a certain part and the plane of rotation decreases with the radius of the part from the outer end to the inner end from 61* to 45*, and the outer impeller is perpendicular to the plane of rotation. Deflect 45* angle towards the fan impeller. During operation, the fan impeller rotates to drive the gas between the outer blade 4 and the guide plate 7 to rotate, so that the gas is formed at a speed difference from the periphery of the guide plate 7, and a negative pressure zone is generated, and the airflow is formed on the side of the fan impeller from the gap between the guide plates. The lateral suction port 10 is sucked in. When the fan impeller rotates at a high speed, the inner swirling airflow extends around the side suction port 10 to form a planar shaped inner-rotating negative pressure air stream, which sucks the soot that is scattered around. The rotation of the inner impeller 5 is in the columnar negative pressure region generated by the axial suction port 11, continuously sucking up the soot drawn from the side suction port, and sucking the vertically rising soot from the axial suction port. The distance between the outer impeller 4 and the guide plate 7 is only 3 mm flying millimeters, and the oil droplets that may be thrown out are quickly hit on the guide plate 7, or are crushed and sucked away, or the guide plate 7 is dropped down to the oil collector. 3 in. By rotating the fan impeller over a blade perpendicular to the plane of rotation, a rotating airflow is generated around the side of the fan wheel, and the rotational velocity of the swirling airflow is greatest at the outer end of the blade. Since the gas flow of the air suction fan of the gas comes from two parts: a part is directly sucked into the air inlet through the filter assembly, which is similar to the function of the conventional range hood; and the other part is the high concentration smoke flow sucked by the auxiliary fan. . Because the suction pipe of the auxiliary fan is long, it is close to the source of the soot, the fry, and the range of the soot is small, the concentration is high, and the better suction effect can be obtained with a smaller displacement. In addition, since the suction port is distributed on the wall of the long suction pipe, a centripetal suction force is formed for the soot that is not sucked around, thereby weakening the lateral diffusion of the soot and making the cross-sectional area of ​​the soot column. It is greatly reduced, which is more conducive to the effective suction of the main fan. Moreover, through the brand-new structure of the suction pipe hood, the cyclone range hood is provided by the casing 1, the motor 2, the oil collecting groove 3, the outer impeller 4, the inner impeller 5, the connecting ring 6, the guiding plate 7, the bolt 8, the hanging head 9 composition. The oil collecting groove 3 is suspended under the casing 1 by bolts 8; the side surface of the fan impeller is evenly mounted with a guiding plate 7 to form a lateral suction port 10; the air inlet direction of the gap between the guiding plates is biased toward the rotating direction of the fan impeller, and is tangential to the rotating circumference The angle is 45°, and the middle of the annular oil collecting groove 3 is an axial suction port 11; the inner impeller 5 and the outer impeller 4 are connected by a connecting ring 6 to be integrally fixed on the shaft of the motor 2, and the angle between the inner impeller and the rotating plane is 45. °, hysteresis, the gas around the side of the impeller is rotated together to form a swirling airflow, and the rotational speed decreases as the radius increases. The inner layer has a large velocity and the outer layer has a small velocity, which produces a pressure difference along the radius and forms a secondary flow in the radial direction. The main flow of the secondary flow and the rotation is superimposed, and a rotating air flow which is tangentially deviated from the rotation circumference by 25* to 45* and flows toward the center of the circle is formed on the side of the fan impeller; in the fan impeller radius area I IOP bath IBI column office: f, In the domain, with the negative pressure suction area of ​​the rotating plane or the conical shape, the airflow drawn by it reaches the impeller radius area and continues to rise, similar to a tornado, and the airflow continuously spirals upward toward the center of rotation. 4. Invisible negative pressure suction mask From the structural point of view, the side of the fan impeller has a lateral suction port, which uses the inward rotation of the airflow generated by the fan impeller to rotate, a flat or conical shape of the vacuum suction The mask extends laterally through the lateral suction port around the range hood to actively suck the soot that escapes around the side suction port of the range hood. Under the normal range of range hood fan speed and power, the effective suction radius of the flat or conical negative pressure suction mask is 2.5 to 3.5 times the radius of the fan impeller. An axial suction port may be opened under the fan impeller; the lateral suction port and the axial suction port may be connected as a whole; the axial suction port may not be opened, and a blower is installed under the fan impeller. The bottom plate of the oil pan is integrated, but a negative pressure cavity is left under the fan impeller so that the soot can be sucked up vertically from the side suction port. In order to accelerate the rotation of the gas around the side of the fan impeller and strengthen the role of the internal swirling airflow, in addition to increasing the fan speed, the following methods can be adopted: one of which causes the blades of the fan impeller to bend or deflect toward the direction of rotation of the fan impeller; The angle between the fan impeller blades and the rotating plane of the fan impeller. From the structural point of view, the maximum shape diameter of the model is between 24 cm and 0 cm, and its invisible vacuum suction mask can effectively absorb diameters of up to 60 cm to 100 cm, and there is no visible soot cover. The control mask does not obstruct the sight of the person, completely avoiding the harm of the soot to the human body and the pollution of the house. 4. Suction effect The biggest feature of the cyclone range hood is that it can suck all the fumes generated in the kitchen (when cooking on the stove) into the hood, overcoming the current suction hood due to the escape of soot. The defects, thus eliminating the harm of the soot to the human body and the pollution to the room. It is the range hood with the highest suction rate among all types of hoods currently on the market.
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