A range hood

Abstract

The application discloses an oil fume extractor, which comprises a smoke collecting hood and a main fan, a main air inlet is formed in the smoke collecting hood, a cyclone device is arranged between the main air inlet and the main fan, the cyclone device comprises a rotating flow collecting part and an outer cover arranged on the outer periphery of the rotating flow collecting part, a longitudinal extension suction jet flow channel is formed in the rotating flow collecting part, the suction jet flow channel is in fluid communication with the main air inlet and the main fan respectively, a cyclone flow channel is formed between the rotating flow collecting part and the outer cover, a nozzle for spraying air flow obliquely downward is arranged at the top of the cyclone flow channel so as to form a cyclone in the cyclone flow channel, and the lower part of the cyclone flow channel is in fluid communication with the suction jet flow channel. Compared with the prior art, the oil fume extractor has the advantages that: an induced rotating flow is formed, in the center of the induced rotating flow, air flow flows upward to form a suction jet flow, the induced rotating flow combines with the suction jet flow to form a "tornado" phenomenon, the oil fume is not easy to diffuse in the cyclone covering area due to the tornado phenomenon, the oil fume is gathered to the center of the air inlet, and the diffusion of the oil fume is slowed down.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They are generally classified into top-mounted and side-mounted types, with top-mounted range hoods gaining wider use due to their neatness, compactness, and small space-saving design.

[0003] Top-mounted range hoods typically include a smoke collection hood, a fan frame mounted on the smoke collection hood, and a volute, impeller, and motor that drives the impeller installed inside the fan frame. An air inlet is located at the center of the smoke collection hood and is directly connected to the high negative pressure zone where the fan frame is located. This is as disclosed in Chinese patent applications 202121190529.6 or 201821996599.9.

[0004] The characteristic of this type of range hood is that the air speed is high and the negative pressure is strong near the air inlet at the bottom of the fan frame, while the negative pressure at the air inlet further away from the bottom of the fan frame decreases significantly. Since the fumes produced during cooking often diffuse during the rising process, if these diffused fumes are not captured by the negative pressure at the air inlet at the bottom of the fan frame, they will escape to the left and right sides, resulting in poor smoke extraction effect of the range hood.

[0005] To improve smoke extraction, a common method is to increase the speed of the fan impeller. Increasing the impeller speed helps to increase the air volume, but at the same time, it will increase the noise, which will not only affect the cooking experience but also people's health. Furthermore, the method of increasing the air volume still has the problem of fumes escaping from both sides. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that can gather oil fumes towards the center of the air inlet, slow down the diffusion of oil fumes, and improve the oil fume extraction effect.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a range hood, including a smoke collection hood and a main fan, wherein the smoke collection hood is provided with a main air inlet, characterized in that: a cyclone device is provided between the main air inlet and the main fan, the cyclone device includes a rotating collection part and an outer cover provided on the outer periphery of the rotating collection part, a longitudinally extending ejector channel is formed inside the rotating collection part, the ejector channel is fluidly connected to the main air inlet and the main fan respectively, a cyclone channel is formed between the rotating collection part and the outer cover, a nozzle is provided at the top of the cyclone channel to spray air downwards to form a cyclone in the cyclone channel, and the lower part of the cyclone channel is fluidly connected to the ejector channel.

[0008] Because a cyclone channel is formed between the rotating collector and the outer cover, and the nozzle is located at the top of the cyclone channel, when the nozzle ejects gas at an angle downwards, the gas forms a downward rotating cyclone in the cyclone channel. The cyclone eventually rotates and ejects from the lower part of the cyclone channel into the extraction channel, forming an induced cyclone. Since a large amount of hot air is generated during cooking, the hot air flows upwards and enters the extraction channel through the main air inlet. That is, at the center of the induced cyclone, the airflow flows upwards to form an extraction flow. This induced cyclone combined with the extraction flow forms a "tornado" phenomenon. Because the fumes are within the cyclone coverage area, they are not easily dispersed. Instead, they can be drawn towards the center of the air inlet, slowing down the spread of fumes and improving the fume extraction effect.

[0009] Furthermore, the rotating flow collector and the outer cover are rotatably arranged relative to each other, and the rotation axis of the rotating flow collector extends in the vertical direction; the rotating flow collector includes a first blade disposed in the cyclone channel to enhance the cyclone. When the first blade rotates, it can further agitate the airflow, thereby enhancing the cyclone effect and helping to form an induced vortex.

[0010] Furthermore, the cyclone device also includes a cooling chamber device capable of cooling the inhaled fumes, and the nozzle is in fluid communication with the cooling chamber device. Since the extracted jet is a hot airflow at a high temperature, while the downward-spraying induced vortex is a cold airflow at a low temperature after cooling, the cold airflow is ejected and sinks, while the hot airflow is ejected and drawn upward. This process creates a pressure difference, which easily forms a vortex, thus further amplifying the "tornado" phenomenon.

[0011] Furthermore, to facilitate the ejection of cooling airflow from the nozzle, an auxiliary air inlet is provided on the smoke collection hood. The cooling cavity device includes a housing fixed inside the outer cover. A cooling cavity air duct and a cooling cavity containing coolant are formed inside the housing. The cooling cavity is arranged adjacent to the cooling cavity air duct to cool the oil fumes entering the cooling cavity air duct. The auxiliary air inlet and the cooling cavity air duct are fluidly connected by an air inlet pipe. The nozzle is located at the bottom of the housing and is fluidly connected to the cooling cavity air duct.

[0012] Furthermore, the rotating collection section includes a rotating upper part located within the housing and a rotating lower part extending below the housing. The ejector channel is formed within the rotating upper part and the rotating lower part, and the cyclone channel is formed between the rotating lower part and the outer cover. The top of the housing has an air outlet that allows the ejector channel to be in fluid communication with the main fan, thereby allowing the fumes to pass through the ejector channel and reach the main fan.

[0013] Furthermore, to facilitate the cooling of the oil fumes drawn in by the auxiliary air inlet into the cold cavity duct, an air inlet is provided at the bottom of the housing. The cold cavity device also includes a first heat-conducting plate disposed inside the housing. The first heat-conducting plate is arranged at intervals on the outer periphery of the rotating upper part, thereby forming the cold cavity duct between the first heat-conducting plate and the rotating upper part. The cold cavity duct has a cold cavity duct inlet communicating with the air inlet.

[0014] Furthermore, to facilitate the formation of the cold cavity air duct inlet, the first heat-conducting plate is arc-shaped, the rotating upper part is cylindrical, the housing is rectangular, the housing has sidewalls connected end to end, the first heat-conducting plate extends between two adjacent sidewalls, and the cold cavity air duct inlet is formed between one end of the first heat-conducting plate and the corresponding sidewall.

[0015] Furthermore, to facilitate the formation of the cold cavity air duct inlet and to further cool the oil fumes using the first heat-conducting plate, the air inlet has four outlets distributed at the four corners of the housing. Each air inlet corresponds to a first heat-conducting plate, and each first heat-conducting plate has a first end and a second end opposite to each other. The first end of the first heat-conducting plate is fixed to one of the side walls and abuts against the side wall. The second end of the first heat-conducting plate has a gap with the adjacent side wall to form the cold cavity air duct inlet. The first end of each first heat-conducting plate and the second end of the adjacent first heat-conducting plate are close to each other, and each air inlet corresponds to a cold cavity air duct inlet. Moreover, with this structure, because the first heat-conducting plate is arc-shaped, the channel area between the air inlet and the cold cavity air duct inlet gradually decreases. As the gas flows from the air inlet to the cold cavity air duct inlet, the airflow speed gradually increases due to the gradually decreasing channel area. Then, the airflow quickly enters the cold cavity air duct. The high-speed airflow in the cold cavity air duct pushes the second blade group of the rotating collector, thereby driving the rotating collector to rotate. The axis of rotation extends in the vertical direction. At the same time, the airflow rotates in the cold cavity air duct. During this flow process, it will come into contact with the first heat-conducting plate one by one, and the gas temperature will further decrease.

[0016] Furthermore, the rotating collector is rotatably coupled with the housing, and the rotation axis of the rotating collector extends in the vertical direction; a first blade for strengthening the cyclone is provided on the outer periphery of the rotating lower part of the rotating collector.

[0017] The outer periphery of the upper rotating part of the rotating collector is provided with a second blade. There are at least two second blades, which are arranged at intervals along the circumference of the upper rotating part. Each second blade constitutes a second blade group. The second blade group is distributed in a radial pattern. Each second blade is curved and its concave surface is opposite to the inlet of the cold cavity air duct.

[0018] This utilizes the airflow of oil fumes to drive the rotating collector, eliminating the need for a separate power unit. The structure is simple and energy consumption is low. When the first blade of the rotating collector rotates, it can further agitate the airflow, thereby strengthening the cyclone effect and helping to form an induced vortex.

[0019] Furthermore, to facilitate the formation of a cooling cavity and to facilitate heat conduction between the cooling cavity and the cold cavity air duct, the cold cavity device also includes a second heat-conducting plate. Each first heat-conducting plate corresponds to a second heat-conducting plate. The second heat-conducting plate extends between the side wall of the housing and the side of the corresponding first heat-conducting plate away from the rotating upper part. Thus, the space between the second heat-conducting plate, the housing, and the first heat-conducting plate constitutes the cooling cavity. The cooling cavity is arranged adjacent to the air inlet.

[0020] Furthermore, a first heater is installed inside the fume hood at a position corresponding to the auxiliary air inlet, thereby accelerating the upward flow of oily fumes.

[0021] Furthermore, to further improve the cooling effect, the cooling cavity device also includes heat sinks, with the heat-absorbing part of the heat sink located inside the cooling cavity and the heat-dissipating part of the heat sink exposed outside the housing.

[0022] Furthermore, the air inlet duct is hollow, forming a vertical air channel inside. An auxiliary fan is installed within the vertical air channel to accelerate the upward flow of the air entering the channel. This increases the wind speed within the vertical air channel, the air intake volume of the auxiliary air inlet, and the air pressure within the cold cavity air channel.

[0023] Furthermore, the bottom of the rotating collector is higher than the bottom of the outer casing, thereby allowing fluid communication between the cyclone channel and the ejection channel.

[0024] Furthermore, a second heater is provided at the bottom of the ejector channel within the rotating collector, which can further heat the temperature of the ejector flow, ensuring that the ejector flow at this location is always at a high temperature.

[0025] Furthermore, the ejector channel is cylindrical, with a constricted bottom or a shape that first constricts and then expands. A constricted shape effectively increases the inlet air velocity, enhancing the ejection effect and amplifying the tornado phenomenon. A constricted-then-expanding shape not only increases the air velocity but also ensures a certain level of negative pressure coverage at the rapidly expanding end, thus balancing both negative pressure and air velocity.

[0026] Furthermore, the fume hood includes a hollow hood body and a cover plate on top of the hood body. The top of the hood body is open and closed by the cover plate. The hood body is annular and rectangular. The main air inlet is located on the cover plate. The annular hood body can block the path of oil fume diffusion. The fume hood body and the cover plate together form an upward concave shape. When the oil fume generated during cooking rises to the fume hood, some of it diffuses to both sides of the range hood and is blocked and buffered by the hood body.

[0027] Furthermore, an auxiliary air inlet is provided on the hood. Since the bottom of the fume hood is a high-temperature cooking environment, while the inside of the annular air duct is relatively low, the temperature difference creates a pressure difference. The airflow flows from high temperature to low temperature, meaning that this part of the diffused fumes enters the range hood through the auxiliary air inlet, reducing the escape of fumes.

[0028] Preferably, the cover includes an inner peripheral wall and an outer peripheral wall spaced apart on the outer periphery of the inner peripheral wall. The space between the inner peripheral wall and the outer peripheral wall forms an annular air duct. At least two notches are provided on the inner peripheral wall to form the auxiliary air inlets. At least one auxiliary air inlet is located on the left side of the cover, at least one auxiliary air inlet is located on the right side of the cover, and the main air inlet is located between the auxiliary air inlets on the left and right sides.

[0029] Furthermore, a first heater is installed inside the smoke hood at a position corresponding to the auxiliary air inlet, thereby enhancing the auxiliary smoke intake effect on one side.

[0030] Compared with the prior art, the advantages of this invention are as follows: Since a cyclone channel is formed between the rotating collector and the outer casing, and the nozzle is located at the top of the cyclone channel, when the nozzle ejects gas obliquely downwards, the gas forms a downward rotating cyclone in the cyclone channel. The cyclone eventually rotates and exits from the lower part of the cyclone channel into the extraction channel, forming an induced vortex. Because a large amount of hot air is generated during cooking, this hot air flows upwards through the main air inlet into the extraction channel, that is, at the center of the induced vortex, the airflow flows upwards to form a jet extraction flow. This induced vortex combined with the extraction flow forms a "tornado" phenomenon. Due to the tornado phenomenon, the fumes are not easily dispersed within the cyclone coverage area. On the contrary, it can draw the fumes towards the center of the air inlet, slowing down the spread of fumes and improving the fume extraction effect; the ring-shaped hood can block the path of fume diffusion, and the hood and cover plate together form an upward concave shape. When the fumes generated during cooking rise to the hood, some of them spread to the sides of the range hood and are blocked and buffered by the hood; by opening auxiliary air inlets on the hood, since the bottom of the hood is a high-temperature cooking environment, while the inside of the ring-shaped air duct is relatively low-temperature, the temperature difference creates a pressure difference. The airflow flows from high temperature to low temperature, meaning that this part of the diffused fumes enters the range hood through the auxiliary air inlets, reducing the escape of fumes. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present invention;

[0032] Figure 2 This is a cross-sectional view (front and rear section) of a range hood according to an embodiment of the present invention;

[0033] Figure 3 This is an exploded structural diagram of the concealed fan frame and fan of a range hood according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of part of the smoke collection hood and air inlet duct of a range hood according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the cyclone device and air inlet duct of the range hood according to an embodiment of the present invention (hidden upper plate of the cold cavity device);

[0036] Figure 6 This is a schematic diagram of the cyclone device of the range hood according to an embodiment of the present invention;

[0037] Figure 7 This is a top view of the cyclone device of the range hood according to an embodiment of the present invention (with the upper plate of the hidden cold cavity device hidden);

[0038] Figure 8 This is a cross-sectional view (left-right cross-section) of a range hood according to an embodiment of the present invention;

[0039] Figure 9-1 This is a schematic diagram of an alternative embodiment of the extraction flow channel of a range hood according to an embodiment of the present invention;

[0040] Figure 9-2 This is a schematic diagram of an alternative embodiment of the exhaust channel of the range hood according to an embodiment of the present invention. Detailed Implementation

[0041] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0043] See Figures 1-4 A range hood includes a smoke collection hood 1, a fan frame 2 disposed above the smoke collection hood 1, and a main fan 3 disposed within the fan frame 2.

[0044] The smoke hood 1 includes a hollow hood body 11 and a cover plate 12 covering the top of the hood body 11. The top of the hood body 11 is open and closed by the cover plate 12. The hood body 11 is annularly rectangular. Figure 1 The dimensions shown are its length in the left-right direction and its width in the front-back direction, with the length being greater than the width. A main air inlet 121 is provided on the cover plate 12, particularly at the middle position in the left-right direction.

[0045] The enclosure 11 includes an inner peripheral wall 111 and an outer peripheral wall 112 spaced apart from the outer periphery of the inner peripheral wall 111. The space between the inner peripheral wall 111 and the outer peripheral wall 112 forms an annular air duct 113, which extends laterally. The inner peripheral wall 111 has at least two notches forming auxiliary air inlets 114. At least one auxiliary air inlet 114 is located on the left side of the enclosure 11, and at least one auxiliary air inlet 114 is located on the right side of the enclosure 11. The main air inlet 121 is located between the auxiliary air inlets 114 on the left and right sides.

[0046] A first heater 13 is provided in the annular air duct 113. The position of the first heater 13 corresponds to the position of the auxiliary air inlet 114, that is, there are two arranged on the left and right. Preferably, the position of each first heater 13 covers the auxiliary air inlet 114 on the corresponding side, so that the oil fumes drawn in by any auxiliary air inlet 114 can be heated by the first heater 13.

[0047] The range hood also includes four air inlet ducts 4, which are respectively arranged on the outer sides of the four corners of the main air inlet 121. The air inlet ducts 4 extend upward from the cover plate 12. Each air inlet duct 4 is hollow, forming a vertically extending vertical air duct 41 inside. The lower end of the air inlet duct 4 is connected to the cover plate 12, so that the vertical air duct 41 and the annular air duct 113 are in fluid communication.

[0048] See Figures 2-8 A cyclone device is installed between the fume hood 1 and the fan frame 2. The cyclone device includes a cold cavity device 51, a rotating collector device 52, and an outer cover 53. The outer cover 53 is located on the outer periphery of the cold cavity device 51 and the rotating collector device 52, between the fume hood 1 and the fan frame 2. Its shape and size are adapted to the fan frame 2. The outer cover 53 is a hollow cuboid with openings at both the top and bottom. The lower end is opposite to the main air inlet 121, and the upper end is located below the main fan 3. That is, in the oil fume flow path, the cyclone device is located upstream of the main fan 3. Alternatively, the outer cover 53 can also be part of the fan frame 2. The rotating collector device 52 is rotatably connected to the cold cavity device 51, and extends downward from inside the cold cavity device 51 to below it. The aforementioned air inlet duct 4 extends inside the outer cover 53.

[0049] The cooling cavity device 51 includes a hollow shell 511, which may be a flat cuboid with an upper plate 5111 and a lower plate 5112 arranged at intervals. The outer periphery of the shell 511 can abut against the outer cover 53. The four corners of the lower plate 5112 are respectively connected to the upper ends of the air inlet ducts 4 at corresponding positions, and the lower plate 5112 has air inlets 5113 at positions corresponding to the air inlet ducts 4, thereby allowing fluid communication between the vertical air duct 41 and the interior of the shell 511. A first heat-conducting plate 513 and a second heat-conducting plate 512 are disposed inside the shell 511, with the second heat-conducting plate 512 disposed adjacent to each air inlet 5113.

[0050] The rotating current collector 52 includes a rotating upper part 521 and a rotating lower part 522 disposed at the bottom of the rotating upper part 521. Both the rotating upper part 521 and the rotating lower part 522 are hollow cylinders with openings at both the top and bottom, and are coaxially arranged. The rotating upper part 521 is located inside the housing 511 of the cold cavity device 51, while the rotating lower part 522 extends downward out of the housing 511. An opening in the lower plate 5112 of the housing 511 of the cold cavity device 51 allows the rotating upper part 521 to pass into the housing 511. The aforementioned first heat-conducting plates 513 are spaced apart on the outer periphery of the rotating upper part 521, and the first heat-conducting plates 513 are arc-shaped with the same curvature as the rotating upper part 521. The rotating current collector 52 can be dynamically engaged with the lower plate 5112 via a rotating slot or bearing. The rotating upper part 521 and the rotating lower part 522 can be an integral structure.

[0051] Each first heat-conducting fin 513 corresponds to an air inlet 5113, and the first heat-conducting fin 513 is disposed between the corresponding air inlet 5113 and the rotating upper part 521. The space inside the housing 511 between the first heat-conducting fin 513 and the rotating upper part 521 forms a cold cavity air duct 514. Each first heat-conducting fin 513 has a first end 5131 and a second end 5132, and the housing 511 has four side walls 5114 connected end to end, forming an annular rectangle, and each side wall 5114 extends between the upper plate 5111 and the lower plate 5112. Each first heat-conducting fin 513 extends between two adjacent sidewalls 5114. The first end 5131 of the first heat-conducting fin 513 is fixed to one of the sidewalls 5114 and abuts against it, thus sealing the cold cavity air duct 514. The second end 5132 of the first heat-conducting fin 513 has a gap with the other adjacent sidewall 5114, forming a cold cavity air duct inlet 5141. Each air inlet 5113 has an adjacent cold cavity air duct inlet 5141. The first end 5131 of each first heat-conducting fin 513 and the second end 5132 of the adjacent first heat-conducting fin 513 are close to each other. An opening is provided on the upper plate 5111 of the cold cavity device 51 at a position corresponding to the rotating upper part 521, forming an air outlet 5115, which serves as the outlet of the ejector channel 525 described below.

[0052] The second heat-conducting plate 512 extends between the side wall 5114 of the housing 511 and the corresponding first heat-conducting plate 513 on the side away from the rotating upper part 521. The side wall 5114 is a side wall fixed to the first end 5131 of the first heat-conducting plate 513 (the first heat-conducting plate 513 corresponding to the second heat-conducting plate 512), and does not obstruct the passage between the cold cavity air duct inlet 5141 and the corresponding air inlet 5113. Thus, the space between the second heat-conducting plate 512, the housing 511, and the first heat-conducting plate 513 constitutes a cooling cavity 515. There are four cooling cavities 515, each adjacent to the corresponding air inlet 5113. Coolant can be placed in the cooling cavity 515 to cool the airflow in the cold cavity air duct 514.

[0053] A heat sink 516 is provided on the upper plate 5111 of the housing 511. The heat absorption part 5161 of the heat sink 516 is located inside the cooling cavity 515, while the heat dissipation part 5162 of the heat sink 516 is located outside the housing 511 and exposed inside the fan frame 2. The number of heat sinks 516 matches the number of cooling cavities 515. A nozzle 517 is also provided on the lower surface of the lower plate 5112 of the housing 511. The nozzle 517 sprays downward at an angle and is in fluid communication with the cooling cavity air duct 514.

[0054] An auxiliary fan 42 is also installed inside the air inlet duct 4. The auxiliary fan 42 is located inside the vertical air duct 41, preferably at the bottom of the vertical air duct 41. It is used to accelerate the airflow entering the vertical air duct 41 upward, thereby further increasing the wind speed in the vertical air duct 41, the air intake volume of the auxiliary air inlet 114, and the air pressure in the cold cavity air duct 514.

[0055] The outer periphery of the rotating upper part 521 of the rotating collector 52 is provided with second blades 523. There are at least two second blades 523, which are arranged at circumferential intervals along the rotating upper part 521. Each second blade 523 constitutes a second blade group, and the second blade groups are distributed in a radial pattern. Each second blade 523 is curved, and its concave surface is opposite to the inlet 5141 of the cold cavity air duct.

[0056] Similarly, the outer periphery of the rotating lower part 522 of the rotating collector 52 is provided with a first blade 524. There are at least two first blades 524 and they are arranged at circumferential intervals along the rotating lower part 522. Each first blade 524 is spirally curved from top to bottom, and each first blade 524 constitutes a first blade group.

[0057] The space in the middle of the rotating collector 52 is configured as an ejector channel 525. Figure 2 As shown, the ejector channel 525 is a regular cylinder; alternatively, see [link to other diagrams]. Figure 9-1 The ejector channel 525 can also be constricted at the bottom. According to the fluid continuity equation, this constriction effectively increases the inlet velocity, which helps improve the ejection effect and enhance the tornado phenomenon. (See also...) Figure 9-2 The ejector channel 525 has a shape that first narrows and then expands. This design can increase the wind speed to a certain extent, and the rapid expansion end can also ensure a certain negative pressure zone coverage, so that the negative pressure zone and wind speed are taken into account.

[0058] A second heater 526 is provided at the bottom of the ejector channel 525. The space between the outer periphery of the rotating lower part 522 and the outer cover 53 forms a cyclone channel 527. Since the bottom of the outer cover 53 is higher than the bottom of the rotating collector 52, the cyclone channel 527 and the ejector channel 525 are in fluid communication.

[0059] The working principle of the range hood of the present invention is as follows:

[0060] Because the lower part of the fume hood 1 is a ring-shaped hood 11, it can block the path of oil fume diffusion and can draw in oil fume through the auxiliary air inlet 114. Furthermore, the fume hood 1, which is composed of the hood 11 and the cover plate 12, is concave in shape. When the oil fume generated during cooking rises to the fume hood 1, some of it diffuses to both sides of the range hood and is blocked and buffered by the hood 11. Since the bottom of the fume hood 1 is a high-temperature cooking environment, while the inside of the ring-shaped air duct 113 is relatively cool, the temperature difference creates a pressure difference. The airflow flows from the high temperature to the low temperature, meaning that this part of the diffused oil fume enters the range hood through the auxiliary air inlet 114.

[0061] The cooling chamber device 51 is located inside the range hood and operates at a low temperature. The coolant in the cooling chamber 515 absorbs high-temperature heat. Simultaneously, when the main fan 3 of the range hood starts, the heat dissipated from the heat sink 516 into the fan frame 2 is drawn away by the main fan 3, effectively dissipating heat from the heat sink 516 and maintaining the cooling chamber device 51 at a consistently low temperature. Based on this, the cooling chamber device 51, connected to the upper end of the vertical air duct 41, maintains a consistently low temperature, while the annular air duct 113, connected to the lower end of the vertical air duct 41, absorbs high-temperature fumes. According to the chimney effect in heat exchange principles, air density differences due to temperature variations create pressure differences. Hot air rises with the chimney, drawn in from the bottom and exiting at the top, thus creating airflow. This vertical air duct 41 is the "chimney." High-temperature fumes are drawn in through the annular air duct 113 and then enter the cooling chamber device 51 through the vertical air duct 41, where they are cooled.

[0062] After the airflow enters the cold cavity device 51 through the vertical air duct 41, it is first heated by the second heat-conducting plate 512 located at the outlet of the vertical air duct 41. Then, it enters the cold cavity air duct 514 through the cold cavity air duct inlet 5141. (See below) Figure 7 As indicated by arrow A. Because the first heat-conducting plate 513 is arc-shaped, the channel area between the air inlet 5113 and the cold cavity air duct inlet 5141 gradually decreases. According to the fluid continuity equation, Q = S * V, where Q is the flow rate, S is the cross-sectional area, and V is the air velocity, it can be seen that, with a constant flow rate, the smaller the cross-sectional area S, the faster the air velocity V. Therefore, during this process, the gas velocity gradually increases due to the gradually decreasing channel area. The airflow then rapidly enters the cold cavity air duct 514. The high-speed airflow in the cold cavity air duct 514 pushes the second blade group of the rotating collector 52, thereby driving the rotating collector 52 to rotate. The rotation axis extends vertically. Simultaneously, the airflow rotates within the cold cavity air duct 514. This flow process contacts the first heat-conducting plate 513 one by one, further reducing the gas temperature. See [link to relevant documentation]. Figure 7 As indicated by the middle arrow B.

[0063] As a large amount of gas enters the cold cavity device 51, high pressure is generated in the cold cavity air duct 514 of the cold cavity device 51. At this time, the nozzle 517 sprays gas obliquely downward. Since a narrow cyclone flow channel 527 is formed between the rotating lower part 522 of the rotating collector 52 and the outer casing 53, and the nozzle 517 is located at the top of the cyclone flow channel 527, when the nozzle 517 sprays gas obliquely downward, the gas forms a downward rotating cyclone in the cyclone flow channel 527. (See [reference]). Figure 8 As indicated by arrow C. Furthermore, due to the rotation of the rotating collector 52, the first blade group located in the rotating lower part 522 of the rotating collector 52 also rotates, further agitating the airflow and strengthening the cyclone effect. The cyclone finally rotates and exits from the lower part of the cyclone channel 527 into the ejection channel 525, forming an induced vortex, see [reference]. Figure 8 As indicated by arrow D in the diagram. Induced swirl is one of the essential conditions for the formation of a tornado effect. At the center of the induced swirl, the airflow flows upward to form a jet stream, which is another essential condition for the formation of a "tornado." This induced swirl, combined with the jet stream, forms the "tornado" phenomenon. The rotating collector 52 has the aforementioned jet stream channel 525 formed inside, with the main fan 3 above it. Under the action of the main fan 3, an upward-flowing jet stream is formed, see [reference needed]. Figure 8 As indicated by arrow E in the diagram. During cooking, a large amount of hot air is generated. This hot air flows upward through the main air inlet 21 and enters the extraction channel 525. The extraction flow is a high-temperature hot airflow, while the downward-spraying induced vortex is a cooled, low-temperature cold airflow. The cold airflow is ejected and sinks, while the hot airflow is ejected and drawn upward. This process creates a pressure difference, easily forming a vortex, further enhancing the "tornado" phenomenon. Because of the tornado phenomenon, the cooking fumes are not easily dispersed within the vortex's coverage area; instead, they concentrate inward, thus significantly improving the fume extraction effect.

[0064] During this process, the second heater 526 installed in the lower rotating part 522 of the rotating collector 52 can further heat the temperature of the jet stream, keeping the jet stream at a high temperature. Combined with the heating of the first heater 13 in the annular duct 113, the airflow drawn into the annular duct 113 is heated, increasing the temperature difference between the upper and lower ends of the vertical duct 41, thereby enhancing the airflow acceleration effect of the chimney effect.

[0065] The range hood of the present invention can also enhance the auxiliary smoke intake effect on one side. Since stir-frying often occurs on one side, or people often only cook on one side of the stove, if cooking occurs on the right side (the left side is not used), then the first heater 13 on the left side will not work, and the first heater 13 on the right side will work. Then the chimney effect on the right side will be more obvious, the airflow will increase, and the auxiliary smoke intake effect will be enhanced.

[0066] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood, comprising a smoke collection hood (1) and a main fan (3), wherein the smoke collection hood (1) is provided with a main air inlet (121), characterized in that: A cyclone device is provided between the main air inlet (121) and the main fan (3). The cyclone device includes a rotating collector (52) and an outer cover (53) disposed on the outer periphery of the rotating collector (52). A longitudinally extending ejector channel (525) is formed inside the rotating collector (52). The ejector channel (525) is in fluid communication with the main air inlet (121) and the main fan (3) respectively. A cyclone channel (527) is formed between the rotating collector (52) and the outer cover (53). A nozzle (517) is provided at the top of the cyclone channel (527) to spray air downwards and form a cyclone in the cyclone channel (527). The lower part of the cyclone channel (527) is in fluid communication with the ejector channel (525). The cyclone device also includes a cooling cavity device (51) capable of cooling the inhaled fumes. The nozzle (517) is in fluid communication with the cooling cavity device (51). An auxiliary air inlet (114) is provided on the smoke collection hood (1). The cooling cavity device (51) includes a housing (511) fixed inside the outer cover (53). A cooling cavity air duct (514) and a cooling cavity (515) containing coolant are formed inside the housing (511). The cooling cavity (515) is arranged adjacent to the cooling cavity air duct (514) to cool the fumes entering the cooling cavity air duct (514). The auxiliary air inlet (114) and the cooling cavity air duct (514) are in fluid communication through an air inlet pipe (4). The nozzle (517) is located at the bottom of the housing (511) and is in fluid communication with the cooling cavity air duct (514).

2. The range hood according to claim 1, characterized in that: The rotating collector (52) and the outer cover (53) are rotatably arranged relative to each other, and the rotation axis of the rotating collector (52) extends in the vertical direction; the rotating collector (52) includes a first blade (524) disposed in the cyclone channel (527) for strengthening the cyclone.

3. The range hood according to claim 1, characterized in that: The rotating collector (52) includes a rotating upper part (521) located inside the housing (511) and a rotating lower part (522) extending below the housing (511). The ejector channel (525) is formed inside the rotating upper part (521) and the rotating lower part (522). The cyclone channel (527) is formed between the rotating lower part (522) and the outer cover (53). The top of the housing (511) is provided with an air outlet (5115) that allows the ejector channel (525) to be in fluid communication with the main fan (3).

4. The range hood according to claim 3, characterized in that: The bottom of the housing (511) is provided with an air inlet (5113). The cold cavity device (51) also includes a first heat-conducting plate (513) disposed inside the housing (511). The first heat-conducting plate (513) is arranged at intervals on the outer periphery of the rotating upper part (521), thereby forming the cold cavity air duct (514) between the first heat-conducting plate (513) and the rotating upper part (521). The cold cavity air duct (514) has a cold cavity air duct inlet (5141) communicating with the air inlet (5113).

5. The range hood according to claim 4, characterized in that: The first heat-conducting plate (513) is arc-shaped, the rotating upper part (521) is cylindrical, the housing (511) is rectangular, the housing (511) has side walls (5114) connected end to end, the first heat-conducting plate (513) extends between two adjacent side walls (5114), and the cold cavity air duct inlet (5141) is formed between one end of the first heat-conducting plate (513) and the corresponding side wall (5114).

6. The range hood according to claim 5, characterized in that: The air inlet (5113) has four distributed at the four corners of the housing (511). Each air inlet (5113) corresponds to a first heat-conducting plate (513). Each first heat-conducting plate (513) has a first end (5131) and a second end (5132) opposite to each other. The first end (5131) of the first heat-conducting plate (513) is fixed to one of the side walls (5114) and abuts against the side wall (5114). The second end (5132) of the first heat-conducting plate (513) has a gap with the adjacent side wall (5114) to form the cold cavity air duct inlet (5141). The first end (5131) of each first heat-conducting plate (513) and the second end (5132) of the adjacent first heat-conducting plate (513) are close to each other. Each air inlet (5113) corresponds to a cold cavity air duct inlet (5141).

7. The range hood according to claim 6, characterized in that: The rotating collector (52) is rotatably engaged with the housing (511), and the rotation axis of the rotating collector (52) extends in the vertical direction; a first blade (524) for strengthening the cyclone is provided on the outer periphery of the rotating lower part (522) of the rotating collector (52); The rotating upper part (521) of the rotating collector (52) is provided with a second blade (523) on its outer periphery. There are at least two second blades (523) and they are arranged at circumferential intervals along the rotating upper part (521). Each second blade (523) constitutes a second blade group. The second blade group is distributed in a radial pattern. Each second blade (523) is curved and its concave surface is opposite to the inlet (5141) of the cold cavity air duct.

8. The range hood according to claim 5, characterized in that: The cooling cavity device (51) further includes a second heat-conducting plate (512), each first heat-conducting plate (513) corresponding to a second heat-conducting plate (512). The second heat-conducting plate (512) extends between the side wall (5114) of the housing (511) and the side of the corresponding first heat-conducting plate (513) away from the rotating upper part (521). Thus, the space between the second heat-conducting plate (512), the housing (511) and the first heat-conducting plate (513) forms a cooling cavity (515), which is arranged adjacent to the air inlet (5113).

9. The range hood according to claim 1, characterized in that: A first heater (13) is provided inside the smoke hood (1) at a position corresponding to the auxiliary air inlet (114).

10. The range hood according to claim 1, characterized in that: The cold cavity device (51) further includes a heat sink (516), the heat absorption part (5161) of the heat sink (516) is located inside the cooling cavity (515), and the heat dissipation part (5162) of the heat sink (516) is exposed outside the housing (511).

11. The range hood according to claim 1, characterized in that: The air inlet duct (4) is hollow and forms a vertical air duct (41) inside. An auxiliary fan (42) is provided in the vertical air duct (41) to accelerate the upward flow of the air entering the vertical air duct (41).

12. The range hood according to any one of claims 1 to 11, characterized in that: The bottom of the rotating collector (52) is higher than the bottom of the outer cover (53), so that the cyclone channel (527) and the ejection channel (525) are in fluid communication.

13. The range hood according to any one of claims 1 to 11, characterized in that: A second heater (526) is provided at the bottom of the ejector channel (525) inside the rotating collector (52).

14. The range hood according to any one of claims 1 to 11, characterized in that: The ejection channel (525) is cylindrical, and the bottom of the ejection channel (525) is constricted or the ejection channel (525) is constricted and then expanded.

15. The range hood according to claim 1, characterized in that: The smoke collection hood (1) includes a hollow hood body (11) and a cover plate (12) covering the top of the hood body (11). The top of the hood body (11) is open and closed by the cover plate (12). The hood body (11) is annular and rectangular. The main air inlet (121) is opened on the cover plate (12).

16. The range hood according to claim 15, characterized in that: An auxiliary air inlet (114) is provided on the cover (11).

17. The range hood according to claim 16, characterized in that: The cover (11) includes an inner peripheral wall (111) and an outer peripheral wall (112) spaced apart on the outer periphery of the inner peripheral wall (111). The space between the inner peripheral wall (111) and the outer peripheral wall (112) forms an annular air duct (113). At least two notches are provided on the inner peripheral wall (111) to form the auxiliary air inlet (114). At least one auxiliary air inlet (114) is located on the left side of the cover (11), and at least one auxiliary air inlet (114) is located on the right side of the cover (11). The main air inlet (121) is located between the auxiliary air inlets (114) on the left and right sides.

18. The range hood according to claim 17, characterized in that: A first heater (13) is provided inside the smoke hood (1) at a position corresponding to the auxiliary air inlet (114).

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