A fan system and a range hood using the same

Abstract

The application discloses a fan system and a range hood applying the fan system. The fan system comprises an impeller, a first shell, a second shell and a flow guide cone. The first shell is a hollow structure with both upper and lower ends being open. The second shell is arranged in the first shell at intervals, so that an annular oil fume passage is formed between the first shell and the second shell. On the oil fume flow path, the impeller is arranged at the upstream of the oil fume passage, and the flow guide cone is arranged at the downstream of the oil fume passage. The fan system further comprises a turbulent flow generating device. The turbulent flow generating device comprises a tail wing arranged on the peripheral wall of the flow guide cone. Holes or slits are formed on the tail wing. Air flow can enter the tail wing and flow out from the holes or slits, so that turbulent flow is formed on the outer periphery of the tail wing through the holes or slits.

Description

Technical Field

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

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, typically using a multi-blade centrifugal fan as its power system. A multi-blade centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. When the impeller rotates, a negative pressure suction is generated at the center of the fan, drawing the cooking fumes from below into the fan. After being accelerated by the fan, the volute collects the fumes and guides them outdoors.

[0003] Existing multi-blade centrifugal fans in range hoods have narrow blades and short flow channels, resulting in short contact time and small contact area between oil fumes and blades, leading to low grease separation efficiency. The current grease separation principle involves a rotating impeller using centrifugal force to throw grease particles and water vapor onto the volute casing's annular wall. The grease and water vapor collected in the volute casing flow into an oil cup through an oil passage, where they are then manually removed. However, Chinese cooking is characterized by heavy oil, stir-frying, and producing large amounts of oil fumes. The low grease separation efficiency of multi-blade centrifugal fans causes oil fume particles and water vapor to be emitted outdoors, polluting the atmosphere. Furthermore, existing multi-blade centrifugal fans typically have 60-65 blades, making the impeller difficult to clean; additionally, due to the structural characteristics of the volute casing itself, accumulated grease inside is also difficult to remove.

[0004] To address the shortcomings of existing range hoods, such as low grease separation and difficulty in cleaning, other types of range hoods with different power systems have been developed. For example, Chinese Patent Application No. 201120223094.0 discloses a range hood that includes an air outlet and an air inlet on the housing. A fan assembly is installed inside the housing, comprising an impeller, an inner cylinder, a motor, guide vanes, and a diffuser. The inner cylinder and diffuser form an annular channel with the housing. The fan assembly also includes an air inlet ring, with the fan inlet integrated with the air inlet ring, which is located at the air inlet position of the impeller. The diffuser is fixed to the rear end of the inner cylinder and is conical or conical-arc shaped.

[0005] This type of fan system has low duct flow resistance and high efficiency, overcoming the problems of backflow of fumes and high back pressure in the common flue of range hoods. However, the diffuser tail of the fan system is prone to forming wake vortices, which can block the air supply channel, resulting in high duct resistance and low fan efficiency. In addition, when backflow of fumes occurs or the flue resistance is high, turbulence is more likely to appear at the diffuser tail, affecting the stable operation of the fan system and leading to low fan efficiency and high noise. Therefore, further improvements are needed. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a fan system that reduces flow resistance and improves fan efficiency, in order to address the shortcomings of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a range hood that uses the above-mentioned fan system, which can reduce the probability of backflow of oil fumes.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a fan system, including an impeller, a first housing, a second housing and a guide cone, wherein the first housing is a hollow structure with open upper and lower ends, and the second housing is disposed in the first housing at intervals, thereby forming an annular fume channel between the first housing and the second housing;

[0009] In the oil fume flow path, the impeller is located upstream of the oil fume channel, and the guide cone is located downstream of the oil fume channel;

[0010] Its features are:

[0011] The fan system also includes a turbulence generating device, which includes a tail fin disposed on the peripheral wall of the guide cone. The tail fin has holes or slots, allowing airflow to enter and exit through the holes or slots, thereby forming turbulence on the outer periphery of the tail fin through the holes or slots.

[0012] By setting up a turbulence generator, some airflow enters the tail fin and is blown out through holes or slots, forming small vortices attached to the wall around the tail fin. This rectifys the flow, reduces the complex vortices generated at the tail of the guide cone, lowers flow resistance, and improves the efficiency of the fan system.

[0013] To facilitate airflow into the tail fin, both the guide cone and the second housing are hollow. The guide cone and the second housing are in fluid communication, the tail fin and the guide cone are in fluid communication, and the second housing is in fluid communication with the air inlet of the fan system.

[0014] Preferably, the second housing allows airflow to enter in such a manner that the impeller includes a hub, at least two blades disposed on the outer periphery of the hub, and a motor for driving the hub to rotate. The motor is located inside the second housing, the hub is located below the second housing, the lower end of the second housing is open, the motor is located inside the second housing, and the second housing is in fluid communication with the air inlet of the fan system through a gap between it and the hub.

[0015] According to one aspect of the invention, the tail fins are at least two and are arranged at circumferential intervals along the guide cone, each tail fin being streamlined and extending upward from the peripheral wall of the guide cone.

[0016] Preferably, to facilitate fluid communication between the tail fin and the guide section, the hole is opened on the outer side of each tail fin away from the guide cone, the tail fin is hollow, and the tail fin extends into the interior of the guide cone, thereby enabling fluid communication between the interior of the guide cone and the hole on the tail fin.

[0017] Preferably, to facilitate fluid communication between the tail fin and the guide section, the slot is opened on the outer side of each tail fin away from the guide cone. The tail fin is hollow and extends into the guide cone, thereby enabling fluid communication between the inside of the guide cone and the hole on the tail fin.

[0018] According to another aspect of the invention, the tail fin is helical, the tail fin is coiled around the outer periphery of the guide cone, the tail fin is hollow, and the tail fin extends into the interior of the guide cone, thereby allowing fluid communication between the interior of the guide cone and the holes on the tail fin.

[0019] To facilitate the power supply for airflow into the tail fin, the turbulence generator also includes a blower for sending airflow into the tail fin.

[0020] To simplify the drive mechanism, the air supply fan is housed within the guide cone and / or the second housing. The impeller includes a hub, at least two blades disposed on the outer periphery of the hub, and a motor for driving the hub to rotate. The motor is housed within the second housing, and the air supply fan and the impeller share the same motor as their power source.

[0021] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a range hood, characterized in that: it applies a fan system as described above.

[0022] Compared with the prior art, the advantages of the present invention are as follows: by setting up a turbulence generating device, after part of the airflow enters the tail fin, the airflow is blown out from the hole or slot and forms small vortices attached to the wall around the tail fin, which is rectified, reducing the complex vortices generated at the tail of the guide cone, reducing flow resistance, and improving the efficiency of the fan system; when used in a range hood, even if backflow of oil fumes occurs, the small vortices attached to the wall generated by the turbulence generating device will block and shield the backflow of oil fumes, thereby reducing the probability of backflow of oil fumes. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a range hood according to the first embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the range hood according to the first embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the fan system of the range hood according to the first embodiment of the present invention;

[0026] Figure 4This is an exploded view of the fan system of the range hood according to the first embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the guide cone and turbulence generating device (hidden air supply fan) of the fan system according to the first embodiment of the present invention;

[0028] Figure 6 This is a cross-sectional view of the guide cone and turbulence generating device (hidden air supply fan) of the fan system according to the first embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the guide cone and turbulence generating device (hidden air supply fan) of the fan system according to the second embodiment of the present invention;

[0030] Figure 8 This is a cross-sectional view of the guide cone and turbulence generating device (hidden air supply fan) of the fan system according to the second embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the guide cone and turbulence generating device (hidden air supply fan) of the fan system according to the third embodiment of the present invention;

[0032] Figure 10 This is a cross-sectional view of the guide cone and turbulence generating device (hidden air supply fan) of the fan system according to the third embodiment of the present invention. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] Example 1

[0036] See Figures 1-6 A range hood includes a smoke collection hood 1, a fan frame 2 located above the smoke collection hood 1, a fan system 3 disposed within the fan frame 2, and an air outlet hood 4 disposed at the air outlet of the fan system 3. In this embodiment, the range hood is a top-mounted type; alternatively, the range hood can also be a side-mounted type, a low-mounted type, etc.

[0037] The fan system 3 includes an impeller 31, guide vanes 32, a first housing 33, a second housing 34, an air inlet ring 35, and a guide cone 36. Both the first housing 33 and the second housing 34 are hollow structures with open top and bottom ends, forming an annular fume channel Q between them. The air inlet ring 35 is located at the bottom of the first housing 33, with an air inlet 351 at its bottom end. Fume airflow can enter through the air inlet 351 at the bottom of the air inlet ring 35 and thus into the first housing 33. The second housing 34 is spaced apart within the first housing 33. The impeller 31 is also located within the first housing 33, near its bottom, above the air inlet ring 35, and upstream of the fume channel Q in the fume flow path. The impeller 31 includes blades 311, a hub 312, and a motor 313. The hub 312 is located at the bottom of the second housing 34, the blades 311 are located on the outer periphery of the hub 312, and the motor 313 drives the blades 311 to rotate by driving the hub 312 to rotate. The motor 313 may be located inside the second housing 34. There is a gap between the bottom of the second housing 34 and the hub 312, so that the interior of the second housing 34 can be in fluid communication with the air inlet 351.

[0038] Preferably, the impeller 31 has a height of 82-88 mm, an inlet diameter of 220-240 mm, and an outlet diameter of 170-185 mm. The number of blades 31 can be selected as 8-11. The impeller 31 has fewer blades, a wider blade passage, and is easier to clean. At least two guide vanes 32 are provided on the outer periphery of the second housing 34, arranged circumferentially along the second housing 34, thereby guiding the oil fume airflow drawn into the impeller 31 upwards. The blades 311 correspond to the bottom of the oil fume passage Q, allowing the oil fume airflow discharged from the impeller 31 to enter the oil fume passage Q upwards. After the oil fume enters the impeller 31 axially, it flows out radially. Oil fume particles and water vapor collide and separate with the air passage. The oil fume then flows upwards through the guide vanes 32, where it undergoes secondary collision and separation, further separating the grease.

[0039] The guide cone 36 is located at the top of the second housing 34, downstream of the fume duct Q, and its lower end is open, thus allowing fluid communication between the interior of the second housing 34 and the interior of the guide cone 36. The guide cone 36 is tapered, wider at the bottom than the top. The space between the top of the first housing 33 and the guide cone 36 forms an air outlet 331, and the aforementioned air outlet hood 4 is located at the air outlet 331. Preferably, the overall height of the fan system 3 is 300–380 mm, the diameter of the air inlet 351 is 200–240 mm, and the outer diameter of the air outlet 331 is 160–180 mm.

[0040] The fan system 3 also includes a turbulence generating device 37. In this embodiment, the turbulence generating device 37 includes at least two hollow tail fins 371, which are arranged circumferentially at intervals along the guide cone 36. The tail fins 371 extend upward from the peripheral wall of the guide cone 36, extending beyond the top of the guide cone 36 and into the exhaust shroud 4. The tail fins 371 are streamlined and protrude toward the interior of the space enclosed by each tail fin 371. At least two holes 372 are provided on the outer side of the tail fins 371 (the outer side of the space enclosed by each tail fin 371, i.e., the side away from the guide cone 36), and these holes 372 are spaced apart along the length of the tail fins 371. The tail fins 371 can extend into the interior of the guide cone 36, thereby allowing fluid communication between the interior of the guide cone 36 and the holes 372 on the tail fins 371. Alternatively, the tail fins 371 can also be in fluid communication with the impeller 31 or the air inlet 351 via a separate conduit.

[0041] The turbulence generating device 37 also includes a blower 373, which is installed in the guide cone 36 and / or the second housing 34 and is powered by the motor 313 of the impeller 31, thereby rotating synchronously with the impeller 31.

[0042] Therefore, by setting up the turbulence generating device 37, part of the airflow enters the interior of the second housing 34 from the gap between the bottom of the second housing 34 and the hub 312 of the impeller 31, and enters the tail fin 371 through the guide cone 36. The airflow is blown out from the hole 372 and forms small vortices attached to the wall around the outer periphery of the tail fin 371, which straightens the tail flow generated by the guide vane 32 along the tail fin 371, reduces the complex vortices generated at the tail (top) of the guide cone 36, reduces flow resistance, and improves the efficiency of the fan system 3. When backflow of oil fumes occurs, the small vortices attached to the wall generated by the turbulence generating device 37 block and shield the backflowing oil fumes, thereby reducing the probability of backflow of oil fumes.

[0043] Example 2

[0044] See Figure 7 and Figure 8In this embodiment, the difference from the first embodiment is that the tail fin 371 gradually converges towards the middle from bottom to top, and a slot 374 extending in the same direction as the tail fin 371 is provided on the outer side of the tail fin 371. The width of the slot 374 can be 1 to 2 mm.

[0045] Example 3

[0046] See Figure 9 and Figure 10 In this embodiment, the difference from the above embodiment 2 is that the tail fin 371 is spiral-shaped, coiled around the outer periphery of the guide cone 36 and the lower end extends into the guide cone 36. The slot 374 is opened on the surface of the tail fin 371 away from the guide cone 36, and the slot on the tail fin 371 extends in the same direction as the tail fin 371 as a whole.

[0047] 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 fan system, comprising an impeller (31), a first housing (33), a second housing (34), and a guide cone (36), wherein the first housing (33) is a hollow structure with open upper and lower ends, and the second housing (34) is disposed at intervals within the first housing (33), thereby forming an annular fume channel (Q) between the first housing (33) and the second housing (34); In the oil fume flow path, the impeller (31) is located upstream of the oil fume channel (Q), and the guide cone (36) is located downstream of the oil fume channel (Q); Its features are: The fan system also includes a turbulence generating device (37), which includes a tail fin (371) disposed on the peripheral wall of the guide cone (36). The tail fin (371) has holes (372) or slots (374) that allow airflow to enter the tail fin (371) and flow out through the holes (372) or slots (374), thereby forming turbulence on the outer periphery of the tail fin (371) through the holes (372) or slots (374).

2. The fan system according to claim 1, characterized in that: The guide cone (36) and the second housing (34) are both hollow. The guide cone (36) and the second housing (34) are in fluid communication. The tail fin (371) is in fluid communication with the guide cone (36). The second housing (34) is in fluid communication with the air inlet of the fan system.

3. The fan system according to claim 2, characterized in that: The impeller (31) includes a hub (312), at least two blades (311) disposed on the outer periphery of the hub (312), and a motor (313) for driving the hub (312) to rotate. The motor (313) is located inside the second housing (34), and the hub (312) is located below the second housing (34). The lower end of the second housing (34) is open, and the second housing (34) is in fluid communication with the air inlet of the fan system through the gap between it and the hub (312).

4. The fan system according to claim 2, characterized in that: The tail fins (371) are at least two and are arranged circumferentially at intervals along the guide cone (36), each tail fin (371) being streamlined and extending upward from the peripheral wall of the guide cone (36).

5. The fan system according to claim 4, characterized in that: Each tail fin (371) has a hole (372) on the outer side away from the guide cone (36). The tail fin (371) is hollow and extends into the interior of the guide cone (36), thereby making the interior of the guide cone (36) and the hole (372) on the tail fin (371) in fluid communication.

6. The fan system according to claim 4, characterized in that: Each tail fin (371) has a slot (374) on the outer side away from the guide cone (36). The tail fin (371) is hollow and extends into the interior of the guide cone (36), thereby making the interior of the guide cone (36) and the hole (372) on the tail fin (371) in fluid communication.

7. The fan system according to claim 2, characterized in that: The tail fin (371) is spiral-shaped and coiled around the outer periphery of the guide cone (36). The tail fin (371) is hollow and extends into the interior of the guide cone (36), thereby enabling fluid communication between the interior of the guide cone (36) and the hole (372) on the tail fin (371).

8. The fan system according to any one of claims 1, 2, or 4 to 7, characterized in that: The turbulence generating device (37) also includes a blower (373) for delivering airflow into the tail fin (371).

9. The fan system according to claim 8, characterized in that: The blower (373) is disposed in the guide cone (36) or the second housing (34). The impeller (31) includes a hub (312), at least two blades (311) disposed on the outer periphery of the hub (312), and a motor (313) for driving the hub (312) to rotate. The motor (313) is disposed in the second housing (34). The blower (373) and the impeller (31) share the motor (313) as power.

10. A range hood, characterized in that: The application includes a fan system as described in any one of claims 1 to 9.

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