Tabletop smoke machine

Abstract

The utility model relates to kitchen electrical technology field, concretely disclose table type range hood, the table type range hood includes the casing, fan and scroll assembly, the casing is provided with the first air inlet of intercommunication air cavity, fan sets up in the air cavity, and the fan includes the shaft and the impeller of setting on the shaft, scroll assembly sets up at the first air inlet, and scroll assembly includes the rotator and the multiple fins of around the circumferential interval of rotator, and the rotator is coaxial fixedly connected with the shaft, and the oblique direction of fin is consistent with the rotation direction of impeller, when the table type range hood works, fan works, and the shaft of fan drives the rotator rotation, and the oblique direction of fin is consistent with the rotation direction of impeller, so the fin will form the rotational flow of flow direction first air inlet at first air inlet, and the rotational flow pulls the surrounding air, and the air around the first air inlet is induced to form the negative pressure field, and the range of negative pressure field is expanded, and the loss of air volume is reduced further, effectively increased the area of negative pressure area, and the oil fume capture efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a countertop range hood. Background Technology

[0002] With the diversification of modern cooking scenarios, countertop range hoods have become an important solution for localized fume control due to their flexible installation. However, limited by dining table space constraints (typically, the overall size of the unit is ≤300mm³), their aerodynamic performance and fume extraction efficiency face significant bottlenecks. Existing products mainly suffer from the following technical shortcomings:

[0003] Due to the limited space of desktop range hoods, existing fan systems generally use centrifugal impellers with a diameter of ≤100mm, which have low aerodynamic efficiency, are prone to flow separation, and result in loss of effective air volume. At the same time, the negative pressure zone generated cannot cover the diffuse plume of oil fumes produced by cooking.

[0004] Therefore, a tabletop range hood is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a tabletop range hood to solve the problems in related technologies, such as the compact size of the tabletop range hood itself and the low aerodynamic efficiency of the fan, which lead to the loss of effective air volume and the inability of the negative pressure zone to cover the diffuse oil fume plume generated by cooking.

[0006] This utility model provides a tabletop range hood, which includes:

[0007] The housing has a first air inlet connected to the ventilation cavity;

[0008] A fan is installed inside a fan cavity. The fan includes a rotating shaft and an impeller sleeved on the rotating shaft.

[0009] A vortex assembly is located at the first air inlet. The vortex assembly includes a rotating body and multiple fins spaced circumferentially around the rotating body. The rotating body is coaxially fixed to the rotating shaft, and the inclination direction of the fins is consistent with the rotation direction of the impeller.

[0010] As a preferred technical solution for tabletop range hoods, the rotating body is equipped with a second air inlet, and multiple fins are located on the outside of the second air inlet;

[0011] The vortex assembly also includes an inner filter screen, which is fixed to the rotating body and covers the second air inlet.

[0012] As a preferred technical solution for tabletop range hoods, the inner filter screen has multiple concentric rings of air holes, with the diameter of the air holes gradually decreasing from the outermost ring to the innermost ring.

[0013] As a preferred technical solution for tabletop range hoods, it also includes a smoke guide column, which is fixed to the vortex assembly and located outside the air cavity, and the smoke guide column is set coaxially with the rotating shaft.

[0014] As a preferred technical solution for tabletop range hoods, the smoke guide column can extend and retract along the axial direction of the rotating shaft.

[0015] As a preferred technical solution for tabletop range hoods, the smoke guide column includes at least two telescopic tubes, which are sequentially nested together. The outer telescopic tube allows the inner telescopic tube to extend out, and the outermost telescopic tube is fixed to the vortex assembly.

[0016] As a preferred technical solution for tabletop range hoods, the smoke guide column also includes a fixing component, which is fixed to the vortex assembly, and the outermost telescopic tube is screwed to the fixing component.

[0017] As a preferred technical solution for tabletop range hoods, the smoke guide column also includes a nut, and the rotating shaft includes a first shaft and a second shaft fixedly connected coaxially. The diameter of the first shaft is smaller than the diameter of the second shaft. The vortex assembly, the fixing part and the nut are sequentially sleeved on the first shaft. The nut is screwed to the first shaft so that the nut and the second shaft clamp the vortex assembly and the fixing part. The nut is located inside the outermost telescopic tube.

[0018] The innermost telescopic tube and nut have a male thread on one and a female thread on the other, and the male thread and female thread are engaged.

[0019] As a preferred technical solution for tabletop range hoods, the smoke guide column also includes an elastic element. One end of the elastic element abuts against the innermost telescopic tube, and the other end of the elastic element abuts against a nut.

[0020] As a preferred technical solution for tabletop range hoods, it also includes an oil filter, which is fixed to the casing and seals the gap between the first air inlet and the vortex assembly.

[0021] As a preferred technical solution for tabletop range hoods, the tilt angle of the fins relative to the rotating shaft is 'a', where 15°≤a≤25°.

[0022] The beneficial effects of this utility model are as follows:

[0023] This utility model provides a tabletop range hood, which includes a casing, a fan, and a vortex assembly. The casing has a first air inlet connected to a ventilation cavity. The fan is located inside the ventilation cavity and includes a rotating shaft and an impeller sleeved on the rotating shaft. The vortex assembly is located at the first air inlet and includes a rotating body and multiple fins spaced circumferentially around the rotating body. The rotating body is coaxially fixed to the rotating shaft, and the inclination direction of the fins is consistent with the rotation direction of the impeller. When the tabletop range hood is working, the fan operates simultaneously, and the fan shaft drives the rotating body to rotate synchronously. Because the inclination direction of the fins is consistent with the rotation direction of the impeller, the fins form a rotating airflow towards the first air inlet. The rotating airflow pulls the surrounding air, inducing the air around the first air inlet to form a negative pressure field. The range of the negative pressure field is expanded, thereby reducing airflow loss, effectively increasing the area of ​​the negative pressure zone, and improving the oil fume capture efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the tabletop range hood in this embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of the tabletop range hood in an embodiment of the present invention (with the smoke guide column protruding).

[0026] Figure 3 This is a cross-sectional view of the tabletop range hood in an embodiment of the present invention (with the smoke guide column retracted).

[0027] Figure 4 This is an exploded schematic diagram of the tabletop range hood in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the telescopic tube in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the nut structure in an embodiment of this utility model.

[0030] In the picture:

[0031] 1. Housing; 11. Air cavity; 12. First air inlet;

[0032] 2. Fan; 21. Shaft; 211. First shaft; 212. Second shaft; 22. Impeller;

[0033] 3. Vortex assembly; 31. Rotating body; 311. Bushing; 312. Outer ring; 313. Connecting part; 314. Second air inlet; 32. Fins; 33. Inner ring filter;

[0034] 4. Smoke guide column; 41. Telescopic tube; 411. Male thread; 412. Inner retaining ring; 413. Outer retaining ring; 42. Fastener; 43. Nut; 431. Female thread; 432. First slide groove; 433. Second slide groove; 44. Elastic element;

[0035] 5. Oil mesh; 51. Clearance hole. Detailed Implementation

[0036] The technical solution of this utility model 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 this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] In the description of this utility model, 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 this utility model 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 this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The embodiments of this utility model are described in detail below. Examples of these 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 throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] like Figures 1-6 As shown, this embodiment provides a tabletop range hood, which includes a housing 1, a fan 2, and a vortex assembly 3. The housing 1 is provided with a first air inlet 12 connected to a ventilation cavity 11. The fan 2 is disposed in the ventilation cavity 11 and includes a rotating shaft 21 and an impeller 22 sleeved on the rotating shaft 21. The vortex assembly 3 is disposed at the first air inlet 12 and includes a rotating body 31 and a plurality of fins 32 arranged circumferentially around the rotating body 31. The rotating body 31 is coaxially fixed to the rotating shaft 21, and the inclination direction of the fins 32 is consistent with the rotation direction of the impeller 22. When the tabletop range hood is working, the fan 2 operates simultaneously, and the rotating shaft 21 of the fan 2 drives the rotating body 31 to rotate synchronously. Since the tilt direction of the fins 32 is consistent with the rotation direction of the impeller 22, the fins 32 will form a rotating airflow towards the first air inlet 12. The rotating airflow pulls the surrounding air and induces the air around the first air inlet 12 to form a negative pressure field. The range of the negative pressure field is expanded, thereby reducing the loss of air volume, effectively increasing the area of ​​the negative pressure zone, and improving the oil fume capture efficiency.

[0041] Optionally, the tilt angle of the fin 32 relative to the rotating shaft 21 is α, where 15°≤a≤25°. In this embodiment, the angle of the fin 32 needs to be set to ensure that the negative pressure area can cover most cooking scenarios. Therefore, through extensive testing, the tilt angle α of the fin 32 was determined to be 15°≤a≤25°. Specifically, the value of α is one of 15°, 20°, and 25°.

[0042] Optionally, the number of fins 32 is 8 to 12, preferably 8 or 10.

[0043] Optionally, the rotating body 31 is provided with a second air inlet 314, and multiple fins 32 are located on the outside of the second air inlet 314; the vortex assembly 3 also includes an inner ring filter 33, which is fixed to the rotating body 31 and covers the second air inlet 314. In this embodiment, the inner ring filter 33 rotates with the rotating body 31. During this process, the inner ring filter 33 generates a tangential force on the oil fumes, thereby causing some of the liquid droplets in the oil fumes to adhere to the inner ring filter 33, thus improving the filtration performance of the inner ring filter 33. In addition, the inner ring filter 33 also functions as a turbulence rectifier. Utilizing aerodynamic coupling, when rotating, the rotating body 31 generates a primary strong vortex. The strong vortex pulls the surrounding air, and the second air inlet 314 forms a secondary weak vortex. The weak vortex suppresses the airflow in the casing 1 from flowing back from the inner ring filter 33, achieving decoupling of axial velocity and tangential velocity, inducing the airflow to form a tornado-like rotating airflow, and expanding the range of the negative pressure field formed by the rotating airflow.

[0044] Optionally, the inner filter screen 33 is provided with multiple concentric rings of air holes, with the pore diameter gradually decreasing from the outermost ring 312 to the innermost ring. In this embodiment, in a tornado-like rotating airflow, due to centrifugal force, the particle diameter gradually decreases from the outer edge to the center of the rotating airflow. Therefore, by matching the distribution of air holes on the inner filter screen 33 with the size of oil droplets, it effectively filters the oil while facilitating the passage of particles and preventing pore blockage.

[0045] Optionally, the tabletop range hood also includes a smoke guide column 4, which is fixed to the vortex assembly 3 and located outside the air cavity 11. The smoke guide column 4 is coaxially arranged with the shaft 21 of the impeller 22. In this embodiment, the smoke guide column 4 anchors the vortex core through its surface structure, thereby improving the control of the oil fume boundary layer, delaying flow separation, optimizing airflow distribution, and improving the efficiency of the fan 2. In addition, the smoke guide column 4 guides the airflow direction, reduces flow resistance, and prevents backflow or diffusion of flue gas.

[0046] Optionally, the smoke guide column 4 can extend and retract along the axial direction of the impeller 22. In this embodiment, this arrangement facilitates the storage of the tabletop range hood. Especially for tabletop range hoods, when the range hood is not in use, the smoke guide column 4 is shortened to its shortest distance, which is beneficial for storing the range hood. When the range hood is in use, the smoke guide column 4 is extended.

[0047] Optionally, the extension distance of the smoke guide column 4 is determined according to the distance between the smoke source and the tabletop range hood.

[0048] Optionally, the smoke guide column 4 includes at least two telescopic tubes 41, which are sequentially nested together. The outer telescopic tube 41 allows a portion of the inner telescopic tube 41 to extend out, and the outermost telescopic tube 41 is fixed to the vortex assembly 3. In this embodiment, an inner retaining ring 412 is provided on the inner peripheral wall of one end of the telescopic tube 41, and an outer retaining ring 413 is provided on the outer peripheral wall of the other end. When the inner telescopic tube 41 extends from one end of the outer telescopic tube 41, the outer retaining ring 413 at the other end of the inner telescopic tube 41 engages with the inner retaining ring 412 at one end of the outer telescopic tube 41, thereby preventing the inner telescopic tube 41 from disengaging from one end of the outer telescopic tube 41. This achieves the telescopic function of the smoke guide column 4.

[0049] In other embodiments, the smoke guide column 4 includes at least two telescopic tubes 41, which are sequentially nested. The telescopic tubes 41 are tapered tubes. The large diameter end of the inner telescopic tube 41 is larger than the small diameter end of the outer telescopic tube 41. Therefore, the inner telescopic tube 41 cannot extend from the small diameter end of the outer telescopic tube 41. The large diameter end of the outermost telescopic tube 41 is fixed to the vortex assembly 3.

[0050] Optionally, the smoke guide column 4 also includes a fixing member 42, which is fixed to the vortex assembly 3, and the outermost telescopic tube 41 is screwed to the fixing member 42. In this embodiment, the fixing member 42 is fixed to the vortex assembly 3 by bolt connection, adhesive bonding or snap-fit, and the outermost telescopic tube 41 is screwed to the fixing member 42. This arrangement facilitates the disassembly of the smoke guide column 4, thereby facilitating the subsequent cleaning and maintenance of the smoke guide column 4.

[0051] Optionally, the smoke guide column 4 further includes a nut 43. The rotating shaft 21 includes a first shaft 211 and a second shaft 212 coaxially fixed together. The diameter of the first shaft 211 is smaller than the diameter of the second shaft 212. The vortex assembly 3, the fixing member 42, and the nut 43 are sequentially sleeved on the first shaft 211. The nut 43 is screwed to the first shaft 211 so that the nut 43 and the second shaft 212 clamp the vortex assembly 3 and the fixing member 42. The nut 43 is located inside the outermost telescopic tube 41. In this embodiment, the rotating shaft 21 is a stepped shaft. The impeller 22 is sleeved on the second shaft 212. After the vortex assembly 3 and the fixing member 42 are sleeved on the first shaft 211, the second shaft 212 and the nut 43 together clamp the vortex assembly 3 and the fixing member 42 to realize the rotation of the vortex assembly 3 relative to the rotating shaft 21.

[0052] Optionally, the rotating body 31 includes a bushing 311, an outer ring 312, and a connecting portion 313 connecting the bushing 311 and the outer ring 312. The fins 32 are disposed on the outside of the outer ring 312, and a second air inlet 314 is formed between the bushing 311 and the outer ring 312. The first shaft 211 passes through the bushing 311, the inner ring filter 33, and the fixing member 42 and is screwed to the nut 43.

[0053] Optionally, the inner peripheral wall of the bushing 311 is provided with a first pin groove, and the outer peripheral wall of the first shaft 211 is provided with a second pin groove. The pin is inserted into both the first pin groove and the second pin groove to realize that the rotating body 31 rotates with the rotating shaft 21.

[0054] Optionally, the innermost telescopic tube 41 and nut 43 are provided with a male buckle 411 and a female buckle 431, respectively, and the male buckle 411 and the female buckle 431 are engaged. In this embodiment, when the tabletop range hood stops working, it is only necessary to retract the inner telescopic tube 41 into the corresponding outer telescopic tube 41 to realize the storage of the smoke guide column 4. At this time, the female buckle 431 and the male buckle 411 are engaged, thereby keeping the smoke guide column 4 in the stored state.

[0055] Regarding the specific structure of the male buckle 411 and the female buckle 431, optionally, the male buckle 411 is a locking protrusion protruding from the inner peripheral wall of the innermost telescopic tube 41, and the female buckle 431 is an L-shaped groove recessed from the outer peripheral wall of the nut 43. The L-shaped groove includes a first sliding groove 432 along the axial direction of the rotating shaft 21 and a second sliding groove 433 extending along the tangent of the rotating shaft 21. After the locking protrusion slides from the first sliding groove 432 to the second sliding groove 433, the innermost telescopic tube 41 is fixed relative to the nut 43.

[0056] Optionally, when there are at least three telescopic tubes 41, the outer peripheral wall of the innermost telescopic tube 41 is provided with a limiting protrusion. When the innermost telescopic tube 41 is fixed relative to the nut 43, the limiting protrusion restricts the telescopic tube 41 between the innermost and outermost telescopic tubes 41 from extending out of the outermost telescopic tube 41.

[0057] Optionally, the smoke guide column 4 also includes an elastic element 44, one end of which abuts against the innermost telescopic tube 41, and the other end of which abuts against the nut 43. In this embodiment, when the male buckle 411 and the female buckle 431 are disengaged, the elastic element 44 drives the innermost telescopic tube 41 to extend from the outermost telescopic tube 41, thereby causing the telescopic tubes 41 between the innermost and outermost telescopic tubes 41 to extend sequentially. Optionally, the elastic element 44 is a coil spring.

[0058] Optionally, the tabletop range hood also includes an oil filter 5, which is fixed to the housing 1 and seals the gap between the first air inlet 12 and the vortex assembly 3. In this embodiment, the oil filter 5 is provided with a clearance hole 51. When the oil filter 5 is installed on the housing 1, the vortex assembly 3 passes through the clearance hole 51, so that the oil filter 5 seals the gap between the first air inlet 12 and the vortex assembly 3. The oil filter 5 can play a filtering role, providing preliminary filtration for the oil fumes entering the first air inlet.

[0059] In other embodiments, optionally, the tabletop range hood does not include the oil filter 5, and the vortex assembly 3 covers the entire first air inlet 12.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. 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. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tabletop range hood, characterized in that, include: The housing (1) is provided with a first air inlet (12) connected to the ventilation cavity (11). A fan (2) is disposed in the air cavity (11). The fan (2) includes a rotating shaft (21) and an impeller (22) sleeved on the rotating shaft (21). A vortex assembly (3) is disposed at the first air inlet (12). The vortex assembly (3) includes a rotating body (31) and a plurality of fins (32) arranged circumferentially around the rotating body (31). The rotating body (31) is coaxially fixed to the rotating shaft (21), and the tilting direction of the fins (32) is consistent with the rotation direction of the impeller (22).

2. The tabletop range hood according to claim 1, characterized in that, The rotating body (31) is provided with a second air inlet (314), and a plurality of the fins (32) are located outside the second air inlet (314); The vortex assembly (3) also includes an inner ring filter (33), which is fixed to the rotating body (31) and covers the second air inlet (314).

3. The tabletop range hood according to claim 2, characterized in that, The inner ring filter (33) is provided with multiple concentric rings of air holes, and the diameter of the air holes gradually decreases from the outermost ring to the innermost ring.

4. The tabletop range hood according to claim 1, characterized in that, It also includes a smoke guide column (4), which is fixed to the vortex assembly (3) and located outside the air cavity (11). The smoke guide column (4) is coaxial with the rotating shaft (21).

5. The tabletop range hood according to claim 4, characterized in that, The smoke guide column (4) can extend and retract along the axial direction of the rotating shaft (21).

6. The tabletop range hood according to claim 5, characterized in that, The smoke guide column (4) includes at least two telescopic tubes (41), which are sequentially sleeved, and the outer telescopic tube (41) allows the inner telescopic tube (41) to extend partially, and the outermost telescopic tube (41) is fixed to the vortex assembly (3).

7. The tabletop range hood according to claim 6, characterized in that, The smoke guide column (4) also includes a fixing member (42), which is fixed to the vortex assembly (3), and the outermost telescopic tube (41) is screwed to the fixing member (42).

8. The tabletop range hood according to claim 7, characterized in that, The smoke guide column (4) also includes a nut (43). The rotating shaft (21) includes a first shaft (211) and a second shaft (212) fixedly connected on the same axis. The diameter of the first shaft (211) is smaller than the diameter of the second shaft (212). The vortex assembly (3), the fixing member (42) and the nut (43) are sequentially sleeved on the first shaft (211). The nut (43) is screwed to the first shaft (211) so that the nut (43) and the second shaft (212) clamp the vortex assembly (3) and the fixing member (42). The nut (43) is located inside the outermost telescopic tube (41). The innermost telescopic tube (41) and the nut (43) are provided with a male buckle (411) and a female buckle (431), respectively, and the male buckle (411) and the female buckle (431) are engaged.

9. The tabletop range hood according to claim 8, characterized in that, The smoke guide column (4) also includes an elastic element (44), one end of which abuts against the innermost telescopic tube (41), and the other end of which abuts against the nut (43).

10. The tabletop range hood according to any one of claims 1-9, characterized in that, It also includes an oil mesh (5), which is fixed to the housing (1) and closes the gap between the first air inlet (12) and the vortex assembly (3).

11. The tabletop range hood according to any one of claims 1-9, characterized in that, The tilt angle of the fin (32) relative to the rotating shaft (21) is a, 15°≤a≤25°.

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