A type of range hood

Abstract

This invention discloses a range hood, comprising: a housing with an impeller disposed inside; a first cyclone separator disposed within the housing, wherein a first air inlet of the first cyclone separator is adapted to receive cooking fumes, a first air outlet of the first cyclone separator is connected to the impeller, a first drain hole is provided at the bottom of the first cyclone separator for discharging oil sludge; and a guide pipe. Thus, according to the principle of the cyclone separator, during rotation, liquid oil droplets, due to their greater density than gas, are thrown to the periphery by a larger centrifugal force and discharged downwards through the first drain hole along the inner wall of the cyclone separator under the combined action of downward airflow and gravity. The clean airflow, freed of liquid oil droplets, is drawn upwards from the center of the cyclone separator, thereby achieving the effect of oil fume separation. Consequently, liquid oil sludge cannot adhere to the inner components and surfaces of the range hood, improving the cleanliness of the range hood's interior.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and specifically to a range hood. Background Technology

[0002] Existing range hoods draw in both air and cooking fumes simultaneously through an impeller before expelling them to the outside via an exhaust duct. However, during operation, the low oil-fume separation rate of current range hoods means that gaseous fumes condense into liquid grease upon contact with the impeller, adhering to the inner components and surfaces of the range hood. This results in the inside of the range hood being covered in grease, severely impacting its fume extraction efficiency, operational reliability, and lifespan.

[0003] To improve the oil fume separation efficiency of range hoods, a prior art document discloses a range hood comprising: a casing, a fan, an oil fume hood, and an oil cup. The fan is connected to the upper part of the casing, and the oil fume hood is located at the lower part of the casing. A cyclone separator is also connected to the lower part of the casing. The oil fume hood is located on one side of the cyclone separator. The upper part of the cyclone separator is cylindrical, and a guide pipe is connected inside the cylinder. A cone is connected to the lower end of the cylinder. A guide vane is connected between the cylinder and the guide pipe. The bottom of the casing is arc-shaped, and an oil guide pipe is connected to the lowest point of the arc-shaped surface. A small oil cup is connected to the oil guide pipe.

[0004] However, when external fumes enter the cyclone separator, their trajectory inside the separator is relatively scattered, resulting in a small contact area and insufficient heat exchange efficiency. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that in the prior art, after external oil fumes enter the cyclone separator, their trajectory inside the cyclone separator is relatively scattered, which leads to a small contact area and insufficient heat exchange efficiency between the oil fumes and the cyclone separator. The present invention provides a range hood.

[0006] To achieve the above objectives, embodiments of the present invention provide a range hood, comprising: a housing having a first receiving cavity inside, wherein an impeller is disposed inside the first receiving cavity; a housing air inlet disposed on the housing; a first cyclone separator disposed below the housing, wherein a first air inlet of the first cyclone separator is adapted to receive cooking fumes, a first air outlet of the first cyclone separator is connected to the housing air inlet, and a first drain hole is disposed at the bottom of the first cyclone separator, the first drain hole being adapted to discharge oil sludge outward; and a guide pipe disposed in the first cyclone separator, the guide pipe being connected to the first air inlet of the first cyclone separator, the guide pipe being spirally arranged in the vertical direction.

[0007] Optionally, the range hood also includes a guide pipe made of metal.

[0008] Optionally, the first air inlet of the first cyclone separator is a volute-type tangential inlet or is inclined downwards. When it is inclined downwards, the inclination angle of the air inlet is between 10° and 45°.

[0009] Optionally, the range hood further includes: an inner shell disposed inside the housing, with a second receiving cavity inside; a first through hole disposed on the inner shell and near the first cyclone separator, with a connecting pipe disposed between the first through hole and the air inlet of the housing; a plurality of second through holes disposed on the inner shell and away from the first cyclone separator, the second through holes being adapted to connect the impeller and the second receiving cavity; a second cyclone separator disposed corresponding to the second through holes, the second air outlet of the second cyclone separator communicating with the second through hole, and the second drain hole of the second cyclone separator extending into the second receiving cavity; and a third through hole disposed at the bottom of the inner shell, the third through hole being adapted to connect the second receiving cavity and the outside.

[0010] Optionally, a plurality of the second cyclone separators are arranged in a ring, and the second air inlet of the second cyclone separator extends toward the connecting pipe.

[0011] Optionally, the second cyclone separator further includes: an air intake section, one end of which extends out of the first through hole, and the other end of which extends toward the second drain hole.

[0012] Optionally, the range hood further includes a chuck with a plurality of through holes, and the second drain hole of the second cyclone separator is correspondingly disposed on the through holes.

[0013] Optionally, the range hood further includes: an oil guiding structure disposed in the inner shell; the oil guiding structure is adapted to receive oil stains falling from the second drain hole; the oil guiding structure is also provided with an oil outlet hole, through which oil discharged is adapted to enter the third through hole.

[0014] Optionally, the oil guiding structure is an oil guiding plate, and the oil guiding plate is provided with an oil guiding groove suitable for guiding oil into the oil outlet.

[0015] Optionally, the oil guide plate is inclined, and the oil outlet is located at the lowest point of the oil guide plate.

[0016] Optionally, the range hood further includes an oil supply pipe, one end of which is inserted into the third through hole and connected to the oil outlet hole.

[0017] Optionally, the range hood further includes: an oil collection shell, which is disposed on the first cyclone separator and communicates with the first drain hole of the first cyclone separator, and the other end of the oil delivery pipe is communicated with the oil collection shell.

[0018] Optionally, the range hood further includes an exhaust pipe disposed between the inner shell and the impeller; the diameter of the exhaust pipe gradually increases along the direction of airflow.

[0019] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0020] 1. An embodiment of the present invention provides a range hood, comprising: a housing having a first receiving cavity inside, wherein an impeller is disposed inside the first receiving cavity; a housing air inlet disposed on the housing; a first cyclone separator disposed below the housing, wherein a first air inlet of the first cyclone separator is adapted to receive fumes, a first air outlet of the first cyclone separator is connected to the housing air inlet, and a first drain hole is disposed at the bottom of the first cyclone separator, the first drain hole being adapted to discharge grease; and a guide pipe disposed in the first cyclone separator, the guide pipe being connected to the first air inlet of the first cyclone separator, the guide pipe being spirally arranged in the vertical direction.

[0021] With this setup, during operation, the oil fumes, upon entering the first cyclone separator, become a gas-liquid mixture due to the temperature difference. Based on the cyclone separator principle, the gas containing liquid oil droplets enters the separator tangentially. Due to the special flow channel design of the cyclone separator, the airflow rotates from top to bottom. During this rotation, the liquid oil droplets, being denser than the gas, experience greater centrifugal force and are thrown to the periphery. They then descend along the inner wall of the cyclone separator under the combined action of downward airflow and gravity and are discharged through the first drain hole. The clean airflow, free of liquid oil droplets, is drawn upwards from the center of the cyclone separator, thus achieving oil fume separation. Consequently, liquid oil cannot adhere to the inner components and surfaces of the range hood, improving the cleanliness of the inside of the range hood and simultaneously enhancing its oil fume extraction efficiency, operational reliability, and service life. Furthermore, by configuring the guide pipe as a spiral tubular structure, this embodiment of the invention can guide the oil fumes, thereby effectively extending the separation path of the oil fumes, increasing the contact area between the pipe wall and the oil fumes, and thus significantly increasing the heat exchange time and heat exchange surface area between the pipe wall and the oil fumes, facilitating the condensation and liquefaction of the oil fumes, and improving the separation efficiency of the mixed gas. In addition, it can accelerate the circular motion of the mixed gas, thereby increasing the centrifugal force and further improving the oil fume separation efficiency.

[0022] 2. By arranging the air inlet in a volute-shaped tangential inlet, this embodiment of the invention effectively reduces turbulent flow caused by airflow within the separator, minimizing wear on the separator walls and preventing rebound during particle movement. Furthermore, by setting the air inlet downwards at an angle between 10° and 45°, the mixed gas, guided by the air inlet, can avoid the gas in the previous cycle after rotating once within the cyclone separator, effectively eliminating the compression phenomenon of the mixed gas itself.

[0023] 3. By setting up multiple second cyclone separators, the mixed gas separated by the first cyclone separator can be further separated into oil fumes, thereby significantly improving the oil fume separation efficiency.

[0024] 4. By setting up an oil collection shell, the first drain hole of the first cyclone separator can be isolated from the outside while functioning as an oil cup. This prevents some airflow from entering the first cyclone separator along the first drain hole during gas separation, thus avoiding the airflow reversing upwards and re-entering the inner vortex of the first cyclone separator, which would prevent the intake of separated oil. This also improves the efficiency of oil fume separation.

[0025] 5. In this embodiment of the invention, by setting an exhaust pipe and gradually increasing the diameter of the exhaust pipe along the flow direction of the airflow, the air velocity at the outlet of the second separator can be increased, thereby improving the suction of the impeller. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of the range hood according to an embodiment of the present invention in the first direction;

[0028] Figure 2 This is a cross-sectional view of the range hood according to an embodiment of the present invention in the second direction;

[0029] Figure 3 This is a partial cross-sectional view of a range hood according to an embodiment of the present invention in the second direction;

[0030] Figure 4 This is a partial cross-sectional view of the range hood according to an embodiment of the present invention in a third direction;

[0031] Figure 5This is a schematic diagram of the chuck and oil guide plate according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of a plurality of second cyclone separators arranged in a ring shape according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the overall structure of the range hood in the fourth direction according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the overall structure of the range hood in the fifth direction according to an embodiment of the present invention.

[0035] Figure label:

[0036] 1. Shell; 2. Impeller; 3. First cyclone separator; 4. Guide pipe; 5. Inner shell; 6. Second cyclone separator; 61. Second air inlet; 7. Connecting pipe; 8. Oil guide plate; 81. Oil guide groove; 82. Oil outlet; 9. Smoke hood; 10. Oil collection shell; 11. Exhaust pipe; 12. Chuck; 121. Through hole; 13. Oil delivery pipe. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Existing range hoods draw in both air and cooking fumes simultaneously through an impeller before expelling them to the outside via an exhaust duct. However, during operation, the low oil-fume separation rate of current range hoods means that gaseous fumes condense into liquid grease upon contact with the impeller, adhering to the inner components and surfaces of the range hood. This results in the inside of the range hood being covered in grease, severely impacting its fume extraction efficiency, operational reliability, and lifespan.

[0042] To improve the oil fume separation efficiency of range hoods, a prior art document discloses a range hood comprising: a casing, a fan, an oil fume hood, and an oil cup. The fan is connected to the upper part of the casing, and the oil fume hood is located at the lower part of the casing. A cyclone separator is also connected to the lower part of the casing. The oil fume hood is located on one side of the cyclone separator. The upper part of the cyclone separator is cylindrical, and a guide pipe is connected inside the cylinder. A cone is connected to the lower end of the cylinder. A guide vane is connected between the cylinder and the guide pipe. The bottom of the casing is arc-shaped, and an oil guide pipe is connected to the lowest point of the arc-shaped surface. A small oil cup is connected to the oil guide pipe.

[0043] However, when external fumes enter the cyclone separator, their trajectory inside the separator is relatively scattered, resulting in a small contact area and insufficient heat exchange efficiency.

[0044] Therefore, the technical problem to be solved by the present invention is that in the prior art, after external oil fumes enter the cyclone separator, their trajectory inside the cyclone separator is relatively scattered, which leads to a small contact area and insufficient heat exchange efficiency between the oil fumes and the cyclone separator. The present invention provides a range hood.

[0045] like Figures 1 to 8 As shown, an embodiment of the present invention provides a range hood, which includes: a housing 1, a guide pipe 4, and a first cyclone separator 3 disposed below the housing 1.

[0046] Specifically, a first receiving cavity is formed inside the shell 1, and an impeller 2 is disposed inside the first receiving cavity. An air inlet is also provided on the shell 1. The first air inlet of the first cyclone separator 3 is suitable for receiving oil fumes, and the first air outlet of the first cyclone separator 3 is connected to the air inlet of the shell 1. A first drain hole is provided at the bottom of the first cyclone separator 3, which is suitable for discharging oil sludge. Furthermore, a guide pipe 4 is disposed in the first cyclone separator 3 and connected to the first air inlet of the first cyclone separator 3. The guide pipe 4 is spirally arranged in the vertical direction. The first cyclone separator 3 includes a cylindrical portion, and the guide pipe 4 is disposed in the cylindrical portion. The vertical length of the guide pipe 4 is greater than or equal to one-quarter of the vertical length of the first cyclone separator 3. The guide pipe 4 can be made of metal. Specifically, to improve the heat exchange performance of the guide pipe 4, a metal with good heat exchange capacity, such as copper or aluminum, can be used.

[0047] Of course, those skilled in the art can change the material and shape of the guide tube 4 according to the actual situation. This embodiment is only an example and is not limited. As long as it can achieve the same technical effect, it is acceptable.

[0048] With this setup, during operation, the oil fumes, upon entering the first cyclone separator 3, become a gas-liquid mixture due to the temperature difference. Based on the cyclone separator principle, the gas containing liquid oil droplets enters the separator tangentially. Due to the special flow channel design of the cyclone separator, the airflow rotates from top to bottom. During this rotation, the liquid oil droplets, being denser than the gas, experience greater centrifugal force and are thrown to the periphery. They then descend along the inner wall of the cyclone separator under the combined action of downward airflow and gravity and are discharged through the first drain hole. The clean airflow, free of liquid oil droplets, is drawn upwards from the center of the cyclone separator, thus achieving oil fume separation. Consequently, liquid oil cannot adhere to the inner components and surfaces of the range hood, improving the cleanliness of the inside of the range hood and simultaneously enhancing its oil fume extraction efficiency, operational reliability, and service life.

[0049] Furthermore, by setting the guide pipe 4 to a spiral tubular structure, this embodiment of the invention can effectively extend the separation path of the oil fume and increase the contact area between the pipe wall and the oil fume, thereby significantly increasing the heat exchange time and heat exchange surface area between the pipe wall and the oil fume, facilitating the condensation and liquefaction of the oil fume, and thus improving the separation efficiency of the mixed gas. It can also accelerate the circular motion of the mixed gas, thereby increasing the centrifugal force and further improving the oil fume separation efficiency. Under the same flow velocity and main geometric parameters, for triangular, quadrilateral, and pentagonal rotary guide pipes, as the number of sides increases, the probability of rotary collision condensation increases, and the oil fume separation effect improves. The circular rotary shape is equivalent to a polygon with countless sides, so it has the highest separation efficiency and the best separation effect. Therefore, at the same flow velocity, as the number of rotary sides increases, the oil fume separation efficiency and separation degree are enhanced. Reducing the cone angle of the guide pipe does not improve the condensation efficiency of oil droplets, but increasing the number of turns of the guide pipe, i.e., increasing the number of rotary flows, can improve the overall oil fume separation efficiency of the separator. Furthermore, the guide pipe 4 in the first cyclone separator 3 can reduce the movement radius of the mixed gas, which conforms to Bernoulli's principle that the smaller the cross-section, the faster the flow velocity, and the lower the fluid pressure. This can lower the condensation point, thereby improving the condensation efficiency and thus improving the oil fume separation efficiency.

[0050] Furthermore, the cone angle, number of coils, and diameter of the guide tube all affect its separation performance, with the order of influence from greatest to least significant being the cone angle, number of coils, and diameter. The cone angle varies from 5° to 15°; in this embodiment, it is 8°. The number of coils varies from 2 to 10; in this embodiment, it is 3. The diameter varies from 30mm to 100mm; in this embodiment, it is 50mm. All three parameters can be adjusted according to actual operating conditions, and there is a corresponding compatibility relationship between them. Given the angular velocity and the guide tube radius, the cone angle can be determined.

[0051] Specifically, in this embodiment of the invention, the first air inlet of the first cyclone separator 3 can be a volute-type tangential inlet or be inclined downwards. When inclined downwards, the inclination angle of the air inlet is between 10° and 45°.

[0052] This invention, by arranging the air inlet in a volute-shaped tangential inlet, effectively reduces turbulence and disturbance caused by airflow within the separator, minimizing wear on the separator walls and preventing rebound during particle movement. Furthermore, by setting the air inlet downwards at an angle between 10° and 45°, the mixed gas, guided by the air inlet, can avoid the gas in the previous cycle after rotating once within the cyclone separator, effectively eliminating the compression phenomenon of the mixed gas itself.

[0053] Optionally, in this embodiment of the invention, the range hood further includes an inner shell 5 and at least one second cyclone separator 6 disposed within the inner shell 5. Specifically, the inner shell 5 is disposed inside the housing 1, and a second receiving cavity is formed inside the inner shell 5. The inner shell 5 is provided with a first through hole, a second through hole, and a third through hole. In this embodiment of the invention, the first through hole is disposed on the inner shell 5 and close to the first cyclone separator 3, and a connecting pipe 7 is disposed between the first through hole and the air inlet of the housing 1. A plurality of second through holes are disposed on the inner shell 5 and away from the first cyclone separator 3. For example, in this embodiment of the invention, the first cyclone separator 3 is disposed at the bottom of the inner shell 5, then the second through holes can be disposed at the top of the inner shell 5 and are adapted to connect the impeller 2 and the second receiving cavity. The inner shell 5 is also provided with a third through hole at the bottom, and the third through hole is adapted to connect the second receiving cavity of the inner shell 5 to the outside. Furthermore, in this embodiment of the invention, the second air outlet of the second cyclone separator 6 is connected to the second through hole, and the second drain hole of the second cyclone separator 6 is correspondingly provided with the third through hole. The second air inlet 61 of the second cyclone separator 6 is located in the inner shell 5.

[0054] In a preferred embodiment, multiple second cyclone separators 6 and multiple second through holes can be provided, with the second air outlet of the second cyclone separator 6 corresponding to and communicating with the second through hole. In this embodiment, the multiple second through holes can be arranged in a ring and opened on the top baffle of the inner shell 5. Correspondingly, the multiple second cyclone separators 6 can also be arranged in a ring in the same plane and disposed in the inner shell 5. In the best case, the connecting pipe 7 can be placed at the center of the circle formed by the multiple second cyclone separators 6. The second air inlet 61 of the second cyclone separator 6 extends toward the connecting pipe 7. The second cyclone separator 6 also includes an air guide section, one end of which extends out of the first through hole, and the other end of which passes through the second air outlet of the second cyclone separator 6 and extends toward the second drain hole.

[0055] During operation, the gas mixture separated by the first cyclone separator 3 enters the inner shell 5 through the connecting pipe 7, and then directly impacts the top baffle of the inner shell 5. Because the top baffle of the inner shell 5, the inner shell 5, and the connecting pipe 7 form a sealed space, the incoming gas mixture is dispersed into the second air inlets 61 of multiple second cyclone separators 6. Following the cyclone separation principle, the separated gas enters the second air outlet of the second cyclone separator 6 and is discharged through the exhaust fan connected to the second air outlet. Liquid oil droplets are discharged sequentially through the second drain hole and the third through hole.

[0056] This invention, by incorporating multiple second cyclone separators 6, further separates the oil and smoke from the mixed gas separated by the first cyclone separator 3, thereby significantly improving the oil and smoke separation efficiency. Furthermore, the first cyclone separator 3 and the second cyclone separators 6 maximize the separation of oil and smoke, allowing the oil and smoke to condense and be discharged before entering the impeller 2. Compared to systems without oil and smoke separation, in this embodiment, the mixed gas does not directly contact the impeller 2 and condense into oil stains and other impurities that remain in the impeller 2's blades. Moreover, because oil stains are sticky and difficult to clean, their adhesion to the impeller 2 disrupts its original dynamic balance, reducing the lifespan of the range hood and generating noise. Therefore, the range hood of this invention significantly extends its lifespan and reduces noise during operation. Since air does not carry oil and smoke into the impeller 2, the impeller 2 never reduces suction power, nor does it reduce airflow due to the filter or other factors.

[0057] In this embodiment of the invention, the interior of the first cyclone separator 3 and the second cyclone separator 6 is made of smooth sheet metal material with low friction. The lower the friction of the separator wall, the stronger the airflow rotation, the lower the static pressure of the gas entering the outlet, and the more effective the conversion of static pressure into dynamic pressure.

[0058] In this embodiment of the invention, an annular recess is provided at the bottom of the inner shell 5, and the first through hole is provided in the annular recess. A retainer is also provided on the annular recess, the retainer being adapted to be inserted into the recess, and the retainer is provided with a fourth through hole, through which the connecting pipe 7 extends into the inner shell 5. The connecting pipe 7 and the fourth through hole are interference-fitted.

[0059] Optionally, in this embodiment of the invention, the range hood further includes an oil guiding structure disposed within the inner shell 5. The oil guiding structure is adapted to receive oil stains falling from the second drain hole. The oil guiding structure also includes an oil outlet hole 82, through which oil discharged is adapted to enter the third through hole. Specifically, the oil guiding structure is an oil guiding plate 8, which has an oil guiding groove 81 adapted to guide oil stains into the oil outlet hole 82. The oil guiding plate 8 has a guide hole adapted to insert a connecting pipe 7, and the oil guiding plate 8 is snapped onto the connecting pipe 7. Further, the oil guiding plate 8 can be tilted so that the oil outlet hole 82 is located at the lowest point of the oil guiding plate 8. Since liquid oil droplets have velocity, an oil guiding groove 81 is machined on the oil guiding plate 8 for easy collection, allowing the liquid oil droplets to enter the oil outlet hole 82 guided by the oil guiding groove 81.

[0060] Optionally, in this embodiment of the invention, a chuck 12 is further provided in the inner shell 5. The chuck 12 is sleeved on the connecting pipe 7 and is located above the oil guide plate 8. The chuck 12 has a through hole 121 suitable for embedding the second cyclone separator 6. The second drain hole of the second separator is correspondingly disposed in the through hole 121, so that the second drain hole of the second separator is directly opposite the oil guide groove 81 on the oil guide plate 8.

[0061] In this embodiment of the invention, by setting a chuck 12 and opening a through hole 121 on the chuck 12 suitable for embedding the second cyclone separator 6, it is possible to ensure that the second drain hole is directly aligned with the oil guide groove 81 on the oil guide plate 8, thereby ensuring the cleanliness of the inside of the inner shell 5.

[0062] Optionally, in this embodiment of the invention, the range hood further includes an oil delivery pipe 13, one end of which is inserted into the third through hole and connected to the oil outlet 82, and the other end extends to the outside. With this configuration, the oil delivery pipe 13 can discharge the liquid oil separated by the second cyclone separator 6 to the outside.

[0063] Furthermore, in this embodiment of the invention, the range hood also includes an oil collection shell 10, which is disposed on the first cyclone separator and communicates with the first drain hole of the first cyclone separator 3. The other end of the oil delivery pipe 13 can be communicated with the oil collection shell 10. Liquid oil droplets will pass through the oil outlet 82, then enter the oil delivery shell through the oil delivery pipe 13, and finally flow into the oil collection bowl in the oil delivery shell.

[0064] In this embodiment of the invention, by setting up an oil collection shell 10, it can not only function as an oil cup, but also isolate the first drain hole of the first cyclone separator 3 from the outside world. This prevents some airflow from entering the first cyclone separator 3 along the first drain hole when the first cyclone separator 3 is performing gas separation. This avoids the airflow reversing upward and re-entering the inner vortex of the first cyclone separator 3, thus preventing the intake of the separated oil. This also improves the oil fume separation efficiency.

[0065] Optionally, in this embodiment of the invention, the range hood further includes an exhaust pipe 11, which is disposed between the inner shell 5 and the impeller 2, and the diameter of the exhaust pipe 11 gradually increases along the flow direction of the airflow.

[0066] In this embodiment of the invention, by setting an exhaust pipe 11 and gradually increasing the diameter of the exhaust pipe 11 along the flow direction of the airflow, the air velocity at the outlet of the second separator can be increased, thereby improving the suction of the impeller 2.

[0067] Optionally, in this embodiment of the invention, the range hood further includes a smoke collection hood 9, which covers the sewage discharge component and the first separator. The smoke collection hood 9 is disposed at the bottom of the housing 1, and the sewage discharge component and the first separator are disposed in the smoke collection hood 9. A fifth through hole suitable for the oil pipe 13 to pass through is provided on the top of the smoke collection hood 9.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A range hood, characterized in that, include: The housing (1) has a first receiving cavity inside, and an impeller (2) is disposed inside the first receiving cavity. An air inlet is provided on the housing (1); The first cyclone separator (3) is located below the housing (1). The first air inlet of the first cyclone separator (3) is suitable for entering the oil fumes. The first air outlet of the first cyclone separator (3) is connected to the air inlet of the housing (1). The bottom of the first cyclone separator (3) is provided with a first drain hole, which is suitable for discharging oil fumes outward. A guide pipe (4) is installed in the first cyclone separator (3). The guide pipe (4) is connected to the first air inlet of the first cyclone separator (3). The guide pipe (4) is arranged in a spiral shape in the vertical direction. The inner shell (5) is disposed inside the shell (1) and has a second receiving cavity inside; The first through hole is provided on the inner shell (5) and near the first cyclone separator (3), and a connecting pipe (7) is provided between the first through hole and the air inlet of the shell (1). A plurality of second through holes are provided on the inner shell (5) and disposed away from the first cyclone separator (3), the second through holes being adapted to connect the impeller (2) and the second receiving cavity; The second cyclone separator (6) is provided corresponding to the second through hole. The second air outlet of the second cyclone separator (6) is connected to the second through hole. The second sewage outlet of the second cyclone separator (6) extends into the second receiving cavity. A plurality of the second cyclone separators (6) are arranged in a ring. The connecting pipe (7) is set at the center of the circle formed by the plurality of second cyclone separators (6). The second air inlet (61) of the second cyclone separator (6) extends toward the connecting pipe (7).

2. The range hood according to claim 1, characterized in that, Also includes: The guide tube (4) is made of metal.

3. The range hood according to claim 2, characterized in that, The first air inlet of the first cyclone separator (3) is a volute-type tangential inlet or is inclined downward. When it is inclined downward, the inclination angle of the air inlet is between 10° and 45°.

4. The range hood according to any one of claims 1 to 3, characterized in that, Also includes: A third through hole is provided at the bottom of the inner shell (5), and the third through hole is adapted to connect the second receiving cavity and the outside.

5. The range hood according to claim 4, characterized in that, The second cyclone separator (6) further includes: an air intake section, one end of which extends out of the first through hole and the other end of which extends toward the second drain hole.

6. The range hood according to claim 5, characterized in that, Also includes: The chuck (12) is provided with a plurality of through holes (121), and the second drain hole of the second cyclone separator (6) is correspondingly provided in the through holes (121).

7. The range hood according to claim 5 or 6, characterized in that, Also includes: An oil guiding structure is provided in the inner shell (5); the oil guiding structure is adapted to receive the oil stains falling from the second drain hole; the oil guiding structure is also provided with an oil outlet hole (82), and the oil discharged through the oil outlet hole (82) is adapted to enter the third through hole.

8. The range hood according to claim 7, characterized in that, The oil guiding structure is an oil guiding plate (8), and the oil guiding plate (8) is provided with an oil guiding groove (81) suitable for flowing oil into the oil outlet (82).

9. The range hood according to claim 8, characterized in that, The oil guide plate (8) is inclined, and the oil outlet (82) is located at the lowest point of the oil guide plate (8).

10. The range hood according to claim 8 or 9, characterized in that, Also includes: The oil pipe (13) is inserted into the third through hole and connected to the oil outlet (82) at one end, and extends to the outside at the other end.

11. The range hood according to claim 10, characterized in that, Also includes: An oil collection shell (10) is installed on the first cyclone separator (3) and is connected to the first drain hole of the first cyclone separator (3). The other end of the oil delivery pipe (13) is connected to the oil collection shell (10).

12. The range hood according to any one of claims 1 to 3, characterized in that, Also includes: An exhaust pipe (11) is disposed between the inner shell (5) and the impeller (2); Along the direction of airflow, the diameter of the exhaust pipe (11) gradually increases.

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