Fan frame and range hood with same

Abstract

A fan frame is provided with a back plate and side plates located on the two sides of the back plate, and is characterized in that a protruding flow dividing and guiding part used for guiding condensate oil is arranged on the inner side face, close to the bottom end, of the back plate and comprises a transition section in the middle, a first flow guiding section and a second flow guiding section, and the first flow guiding section and the second flow guiding section are located at the two ends of the transition section. A strip-shaped oil guide groove is formed in the bottom of the back plate, and an oil guide hole capable of guiding condensate oil into the oil net is formed in the oil guide groove. The utility model further discloses a fan frame. The flow of oil drops on the inner side of the back plate is controlled at a constant speed through the flow dividing and guiding part with a special structure, and the condition that a large amount of condensed oil is concentrated in a certain area is avoided, so that the condensed oil can be better guided to an oil net, and the phenomenon of oil flying is reduced.

Description

Technical Field

[0001] The utility model relates to a bracket for arranging a fan, in particular to a fan bracket applied to a range hood. The utility model also relates to a range hood and belongs to the technical field of oil fume purification devices. Background Art

[0002] Traditional European range hoods have an independent oil cup to collect condensed oil. On the one hand, the existence of the oil cup will increase the cost of the whole machine; on the other hand, the oil cup has a certain impact on the appearance. In addition, since the oil cup blocks the back air intake channel, it is not friendly to users of multi-burner stoves (more than two burners).

[0003] As a new exploration, European-style range hoods without independent oil cups are increasingly used. Smoke guide plates (also known as rectifier plates) are increasingly commonly used in range hoods. The basic structure is: the smoke guide plate is arranged on the smoke hood and faces the aforementioned smoke inlet port. A smoke inlet gap is formed around the smoke guide plate and the lower end surface of the smoke hood. The smoke guide plate can play a role in rectifying and guiding smoke. For relevant literature, please refer to the Chinese invention patent "Water Curtain Filter Range Hood" with patent number ZL201710045252.X (authorization announcement number CN107191986B); you can also refer to the Chinese invention patent "A Range Hood" with patent number ZL201811273333.6 (authorization announcement number CN111121116B).

[0004] Now there is a kind of European-style range hood without independent oil cup, which integrates the oil cup structure into the smoke guide plate, that is, an oil collecting groove is formed on the back of the smoke guide plate, which serves as the function of the oil cup. For relevant patent literature, please refer to the Chinese utility model patent "A Smoke Guide Plate for Range Hood" with patent number ZL201721042124.1 (authorization announcement number CN207065683U). In this patent, an oil collecting part is provided at the rear of the smoke guide plate body, and the oil collecting part is integrally formed with the smoke guide plate body.

[0005] For related literature, please refer to the Chinese invention patent application publication "A Range Hood" with application number 202011124142.0 (application publication number CN112664479 A). The specification

[0052] of the document mentions that "each smoke guide plate 41 gradually tilts downward from front to back, and the rear side of the smoke guide plate 41 protrudes downward to form an oil collecting groove 42, that is, the smoke guide plate 41 can also be used as an oil cup. The left and right front edges of each smoke guide plate 41 have upward flanges 411, so that the smoke guide plate 41 constitutes a container. In this way, the smoke guide plate 41 can receive the oil dripping from the oil dripping port 34."

[0006] Although the design without independent oil cup solves the problem of traditional European range hoods, it brings the problem of "flying oil". The so-called "flying oil" refers to the oil droplets inside the range hood (including oil droplets at the oil nozzle and oil droplets at the oil net) changing their trajectory due to airflow disturbance, and then flying out from the rear air inlet channel and sticking to the back wall, forming a large area of ​​oil hanging phenomenon. Fig.16 As shown, the motion trajectory of the oil droplet changes from simple straight-line motion to complex curved motion.

[0007] Due to the existence of oil cup in traditional European range hoods, the "flying oil" problem will not appear (difficult to identify). However, due to the special structural form of European range hoods without independent oil cups, the "flying oil" problem will exist. Utility Model Content

[0008] The first technical problem to be solved by the utility model is to provide a fan frame capable of reducing the "flying oil" phenomenon in view of the above technical status quo.

[0009] The second technical problem to be solved by the present invention is to provide a range hood which can reduce the "flying oil" phenomenon in view of the above technical status quo.

[0010] The technical solution adopted by the utility model to solve the first technical problem mentioned above is: a fan frame, comprising a back plate and side plates located on both sides of the back plate, characterized in that the inner side surface of the back plate of the fan frame has a protruding diversion and guide portion near the bottom end for guiding the condensed oil, the diversion and guide portion comprises a transition section in the middle and a first guide section and a second guide section located at both ends of the transition section, and a strip-shaped oil guide groove is provided at the bottom of the back plate, and the oil guide groove has an oil guide hole that can guide the condensed oil into the oil net.

[0011] Preferably, the flow diversion and guide portion is generally in an eight-shaped shape.

[0012] Preferably, the profile of the transition section is a curve, and the profiles of the first guide section and the second guide section are both straight lines.

[0013] Preferably, an inclined portion is provided on the inner side surface of the back plate of the fan rack near the bottom end, and the flow splitting and guiding portion is formed on the inclined portion.

[0014] Preferably, the upper end surface and the lower end surface of the flow splitting and guiding portion respectively form a front guide surface and a rear guide surface with a smooth transition with the end surface of the inclined portion.

[0015] Preferably, the cross-section of the oil guiding groove is V-shaped.

[0016] Preferably, the oil guide groove includes a guide surface close to the back plate, a transition surface in the middle and an oil baffle slope located at the outer end of the transition surface, the aforementioned transition surface is concave and has an oil storage area, and the oil guide hole is opened on the oil baffle slope.

[0017] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, comprising

[0018] Wind rack;

[0019] A volute, which is arranged in the aforementioned fan frame and has an oil leakage hole at the bottom;

[0020] A smoke collecting hood is arranged at the bottom of the fan frame, and the smoke collecting hood has a smoke inlet port facing downward; and

[0021] The oil net is arranged on the aforementioned smoke inlet port.

[0022] The oil net has a first oil collection area and a second oil collection area arranged at intervals and both concave downward in the length direction, an oil guide plate is provided between the first oil collection area and the second oil collection area, the oil guide plate includes a buffer section in the middle for receiving the oil from the oil leakage nozzle and a first oil guide section and a second oil guide section located on both sides of the buffer section, the first oil guide section can introduce the oil from the buffer section into the first oil collection area, and the second oil guide section can introduce the oil from the buffer section into the second oil collection area.

[0023] Preferably, the first oil collecting area is in an inverted cone shape.

[0024] Preferably, the first oil collecting area is composed of four surfaces, namely a front surface, a rear surface, and a left surface and a right surface located between the front surface and the rear surface. The front surface and the rear surface form an intersection line, and the intersection line is the lowest position of the first oil collecting area.

[0025] Preferably, the angle α between the rear profile and the horizontal plane satisfies the following condition: 41.8°≥α≥30.4°.

[0026] Preferably, the range hood further comprises

[0027] The smoke guide plate is arranged on the aforementioned smoke hood and faces the aforementioned smoke inlet port, and a smoke inlet gap is formed between the periphery of the smoke guide plate and the lower end surface of the smoke hood; an oil collecting groove is formed on the back of the smoke guide plate, and the oil collecting groove can receive the oil dripping from the oil net. In order to effectively avoid the strong airflow disturbance area, the lateral distance between the two sides of the smoke guide plate is greater than the lateral distance between the two sides of the oil net; the length of the smoke guide plate is L, the length of the intersection line is L1, and the length of the end of the aforementioned intersection line close to the vertical reference plane of the center of the oil net is L2 from the vertical reference plane, which meets the following conditions:

[0028] 0.1L≥L1≥0.13L, 0.15L≥L2≥0.2L.

[0029] Preferably, the smoke guide plate is higher at the front and lower at the back and is arranged in an inclined shape.

[0030] Compared with the prior art, the advantages of the utility model are: in order to control the oil droplet flow on the inner side of the back plate to maintain a uniform speed, achieve the effect of fixed-point outflow, uniform outflow, and uniform outflow, and avoid the occurrence of a large amount of condensed oil concentrated in a certain area, this is achieved through a special structure of the diversion and guide part, so that it can be better drained to the oil net, thereby reducing the occurrence of "flying oil" phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0032] Figure 2 for Figure 1 Schematic diagram of the structure after removing the cover plate.

[0033] Figure 3 It is a structural schematic diagram of another viewing angle of the embodiment.

[0034] Figure 4 for Figure 3 Schematic diagram of the central smoke deflector after opening.

[0035] Figure 5 This is an enlarged view of the fan rack.

[0036] Figure 6 This is an enlarged view of the smoke guide plate.

[0037] Figure 7 This is a three-dimensional cross-sectional view of the wind rack.

[0038] Figure 8 for Figure 7 Enlarged view of part A in the middle.

[0039] Fig. 9 This is an enlarged view of the volute.

[0040] Fig.10 This is an enlarged view of the oil guide plate.

[0041] Fig.11 This is an enlarged stereoscopic image of the oil net.

[0042] Fig.12 This is the main view of the oil network.

[0043] Fig.13 This is the side view of the oil screen.

[0044] Fig.14 A side view of an embodiment.

[0045] Fig.15 It is the front view of the embodiment.

[0046] Fig.16 Schematic diagram of the oil droplet motion trajectory.

[0047] Fig.17 This is a schematic diagram of the flow field of the entire range hood.

[0048] Fig.18 Schematic diagram of the flow field on the upper inner surface of the smoke guide plate.

[0049] Fig.19 Schematic diagram of the flow field on the upper inner surface of the smoke guide plate from a top view. DETAILED DESCRIPTION

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0051] like Figure 1 to Figure 4 As shown, the range hood in this embodiment includes a fan frame 1, a volute 2, a smoke hood 5, an oil net 4 and a smoke guide plate 7. A cover plate 6 is provided on the front end surface of the fan frame 1; the volute 2 is provided in the fan frame 1 and has an oil leakage hole 2a at the bottom; an impeller can be provided in the volute 2. The smoke hood 5 is provided at the bottom of the fan frame 1, and the smoke hood 5 has a smoke inlet port facing downward; the oil net 4 is provided on the smoke inlet port, and the smoke guide plate 7 is provided on the smoke hood 5 and faces the smoke inlet port, and is detachably connected to the smoke hood 5 through claws around it, and a smoke inlet gap is formed between the smoke guide plate 7 and the lower end surface of the smoke hood 5; combined with Figure 6 As shown, the smoke guide plate 7 is higher in front and lower in the back and is arranged in an inclined shape. An oil collecting groove 71 is formed on the back of the smoke guide plate 7, and the oil collecting groove 71 can receive the oil dripping from the oil net 4. The lateral distance between the two sides of the smoke guide plate 7 is greater than the lateral distance between the two sides of the oil net 4; the smoke guide plate 7 is higher in front and lower in the back and is arranged in an inclined shape. The length of the smoke guide plate 7 is L.

[0052] Combination Fig. 9 and Fig.10 As shown, an oil guide plate 3 for receiving oil from the oil leakage hole 2a and the oil from the outer wall of the volute 2 is provided on the outer side of the bottom of the volute 2, and an oil leakage nozzle 36 is provided at the bottom of the oil guide plate 3.

[0053] The oil net 4 has a first oil collecting area 41 and a second oil collecting area 42 which are arranged at intervals and are both recessed downward in the length direction. An oil guide plate 8 is provided between the first oil collecting area and the second oil collecting area 42. The oil guide plate 8 includes a buffer section 83 in the middle for receiving the oil from the oil leakage nozzle 36 and a first oil guide section 81 and a second oil guide section 82 located on both sides of the buffer section 83. The first oil guide section 81 can introduce the oil from the buffer section 83 into the first oil collecting area 41, and the second oil guide section 82 can introduce the oil from the buffer section 83 into the second oil collecting area 42.

[0054] During operation, the oil droplets first drip onto the buffer section 83. As the oil droplets accumulate, the oil is pushed to both sides and enters the first oil collecting area and the second oil collecting area along the left and right oil guide surfaces, and then drips at the lowest points of the first oil collecting area and the second oil collecting area.

[0055] The first oil collecting area 41 is in an inverted cone shape. The first oil collecting area 41 is composed of four profiles, namely, a front profile 4a, a rear profile 4b, and a left profile 4c and a right profile 4d located between the front profile 4a and the rear profile 4b. The front profile 4a and the rear profile 4b form an intersection line 4e, and the intersection line 4e is the lowest position of the first oil collecting area 41. The angle α between the rear profile 4b and the horizontal plane satisfies the following conditions: 41.8°≥α≥30.4°.

[0056] The length of the intersection line 4e is L1, and the length of one end of the intersection line 4e close to the vertical reference plane at the center of the oil net 4 from the vertical reference plane is L2, satisfying the following conditions: 0.1L≥L1≥0.13L, 0.15L≥L2≥0.2L.

[0057] In this embodiment, the second oil collection area is set with reference to the first oil collection area, and the two are preferably symmetrically designed.

[0058] Combination Fig.19 As shown, the first oil collection area 41 and the second oil collection area 42 are separately arranged to avoid the strong airflow disturbance area and eliminate the influence of the airflow on the upper part of the smoke guide plate on the movement trajectory of the oil droplets. The first oil collection area and the second oil collection area are located as a whole in the weak airflow disturbance area.

[0059] like Figure 7 and Figure 8 As shown, the inner side surface of the back plate 11 of the fan frame 1 has a protruding diverter 22 for diverting condensed oil near the bottom. In order to control the flow of oil droplets and maintain a uniform speed, the diverter 22 includes a transition section 223 in the middle and a first diverter 221 and a second diverter 222 located at both ends of the transition section 223. The diverter 22 is generally in an eight-shaped shape. The profile of the transition section 223 is a curve, and the profiles of the first diverter 221 and the second diverter 222 are both straight lines. The inner side surface of the back plate 11 of the fan frame 1 is provided with an inclined portion 21 near the bottom, and the diverter 22 is formed on the inclined portion 21. The diverter 22 and the back plate 11 can be integrally stretched and formed, or a split form can be used.

[0060] The upper end surface and the lower end surface of the flow dividing and guiding portion 22 respectively form a front guide surface 23 and a rear guide surface 24 with smooth transition with the end surface of the inclined portion 21 .

[0061] To ensure the flow guiding effect of the oil diverting portion 22, the front flow guiding surface 23 and the inclined portion 21 need to be kept perpendicular. To facilitate processing and manufacturing, the rear flow guiding surface 24 and the inclined portion 21 may have a certain inclination angle.

[0062] The bottom of the back plate 11 is provided with a strip-shaped oil guide groove 25, and the oil guide groove 25 has an oil guide hole 254 that can guide the condensed oil into the oil net 4. The cross section of the oil guide groove 25 is V-shaped. The oil guide groove 25 includes a guide surface 251 close to the back plate 11, a transition surface 252 in the middle, and an oil blocking inclined surface 253 located at the outer end of the transition surface 252. The transition surface 252 is concave and has an oil storage area, and the oil guide hole 254 is provided on the oil blocking inclined surface 253. The oil guide grooves 25 in this embodiment are arranged in a row, and are spaced apart from each other to form an oil guide channel. The oil guide grooves 25 can be integrally stretched and formed, or can be used in a split form.

[0063] When the condensed oil accumulates to a certain extent in the transition area, it flows out evenly from both sides of the oil guide groove and the oil guide hole, achieving the effect of fixed-point flow, uniform flow, and uniform flow, thereby avoiding the situation where a large amount of condensed oil is concentrated in a certain area. In addition, in order to facilitate assembly operations, the oil guide groove is divided into four sections in this embodiment, and a certain assembly gap is reserved between two adjacent sections.

[0064] The flow dividing and guiding portion 22 and the oil guiding groove 25 can well receive the condensed oil on the fan frame 11, so that the condensed oil flows evenly to the oil net.

[0065] The formation mechanism of the "flying oil" problem:

[0066] like Fig.14 and 15 As shown, smoke inlet gaps are formed around the smoke guide plate 7 and the lower end surface of the smoke collecting hood 5, namely the front inlet 17F, the rear inlet 17B, the side inlet 17L and the side inlet 17R. The front end of the volute forms the main air inlet channel FD1, and the rear end of the volute forms the secondary air inlet channel FD2.

[0067] The formation of the "flying oil" problem indicates that there is a combined external force inside the whole machine that forces the trajectory of the oil droplet to deflect, that is, the trajectory of the oil droplet changes from a simple straight line motion to a complex curve motion, such as Fig.16 Schematic diagram of the motion of a rigid sphere.

[0068] In order to find out the combined external force inside the whole machine, the internal flow field of the whole machine was analyzed by combining simulation methods. Fig.17 As shown in the flow field of the whole machine, there is an obvious deflected airflow at the oil leakage hole 2a of the volute, and the airflow is obviously deflected backward, which is consistent with the above theoretical analysis and is marked as the resultant external force F1.

[0069] like Fig.18As shown, the flow field on the upper inner surface of the smoke guide plate shows that the airflow enters the range hood in a circular manner around the smoke guide plate, but due to the structural asymmetry of the main air inlet channel FD1 (located at the front end of the volute) and the secondary air inlet channel FD2 (located at the rear end of the volute), there is an obvious difference in flow distribution between the main air inlet channel FD1 and the secondary air inlet channel FD2, resulting in an obvious backward movement trend of the airflow close to the inner surface of the smoke guide plate. The airflow starts from the rounded corner of the leading edge 71-F of the smoke guide plate, and moves obliquely toward the middle of the trailing edge 71-B of the smoke guide plate, forming three obvious strong airflow disturbance areas, which are marked as the resultant external force F2.

[0070] Based on the above analysis, the formation mechanism of the "flying oil" problem is clarified, that is, the existence of the combined external forces F1 and F2 causes the oil droplets to change their trajectory, which in turn causes the oil droplets to splash out from the rear inlet 17B and adhere to the back wall to form oil stains.

[0071] In this embodiment, the oil is guided to the inner wall of the fan frame and the condensed oil inside and outside the volute is guided and drained, and finally the oil is uniformly and orderly introduced into the first oil collection area and the second oil collection area, and finally drips onto the smoke guide plate for collection. Fig.19 , it can be known that the first oil collection area and the second oil collection area are located in the weak airflow disturbance area, thereby reducing the occurrence of the "flying oil" phenomenon.

[0072] Combination Fig.14 and Fig.15 As shown, the "flying oil" problem system divides the accumulated oil inside the range hood into three branches, marked as X, Y, and Z, and finally gathers to the lowest position corresponding to the first oil collection area and the lowest position corresponding to the second oil collection area 42. Among them, the X branch is the condensed oil flow route of the fan frame, the Y branch is the condensed oil flow route of the outer wall of the volute, and the Z branch is the oil drop flow route at the oil leakage hole 2a of the volute and the oil guide plate. The first oil collection area corresponds to the lowest position.

[0073] Working principle: When the range hood is turned on, the oil smoke enters the range hood from the surrounding of the smoke guide plate 7, flows through the oil net 4, and enters the impeller along the main air inlet channel FD1 and the secondary air inlet channel FD2 respectively, and is discharged radially after the impeller does work, completing the entire process of absorbing and exhausting oil smoke. During operation, as time goes by, condensed oil gradually forms on the fan frame and flows downward along the X branch line; condensed oil gradually forms on the outer wall of the volute and flows downward along the Y branch line; oil begins to drip from the oil leakage nozzle of the volute and the oil leakage hole of the oil guide plate, and flows downward along the Z branch line. The oil droplets of the X, Y, and Z branches finally gather at the lowest position corresponding to the first oil collection area and the lowest position corresponding to the second oil collection area 42, and finally drip onto the smoke guide plate 7.

Claims

1. A fan rack having a back plate and side plates located on both sides of the back plate, characterized in that The inner side surface of the back plate (11) is provided with a protruding flow diversion guide portion (22) for guiding condensed oil near the bottom end, the flow diversion guide portion (22) comprising a transition section (223) in the middle and a first flow diversion section (221) and a second flow diversion section (222) located at both ends of the transition section (223); a strip-shaped oil guide groove (25) is provided at the bottom of the back plate (11), and an oil guide hole (254) is provided on the oil guide groove (25) for guiding condensed oil into the oil net (4).

2. The fan rack according to claim 1, characterized in that The flow dividing and guiding portion (22) is generally in an eight-shaped shape.

3. The fan rack according to claim 1, characterized in that The profile of the transition section (223) is a curve, and the profiles of the first flow guide section (221) and the second flow guide section (222) are both straight lines.

4. The fan rack according to claim 1, characterized in that An inclined portion (21) is provided on the inner side surface of the back plate (11) of the fan frame (1) near the bottom end, and the flow splitting and guiding portion (22) is formed on the inclined portion (21).

5. The fan rack according to claim 4, characterized in that The upper end surface and the lower end surface of the flow dividing and guiding portion (22) respectively form a front flow guiding surface (23) and a rear flow guiding surface (24) with smooth transition with the end surface of the inclined portion (21).

6. The fan rack according to claim 1, characterized in that The cross section of the oil guide groove (25) is V-shaped.

7. The fan rack according to claim 1, characterized in that The oil guide groove (25) comprises a guide surface (251) close to the back plate (11), a transition surface (252) in the middle, and an oil blocking inclined surface (253) located at the outer end of the transition surface (252). The transition surface (252) is concave and has an oil storage area, and the oil guide hole (254) is opened on the oil blocking inclined surface (253).

8. A range hood having a fan frame as claimed in any one of claims 1 to 7, characterized in that It comprises a fan frame (1); A volute (2) is arranged in the fan frame (1) and has an oil leakage hole at the bottom; A smoke collecting hood (5) is arranged at the bottom of the fan frame (1), and the smoke collecting hood (5) has a smoke inlet port facing downward; and The oil net (4) is arranged on the aforementioned smoke inlet port.

9. The range hood according to claim 8, characterized in that The oil net (4) has a first oil collection area (41) and a second oil collection area (42) arranged at intervals in the length direction and both concave downwards. An oil guide plate (8) is provided between the first oil collection area and the second oil collection area (42). The oil guide plate (8) comprises a buffer section (83) in the middle for receiving oil from the oil leakage nozzle (36) and a first oil guide section (81) and a second oil guide section (82) located on both sides of the buffer section (83). The first oil guide section (81) can guide oil from the buffer section (83) into the first oil collection area (41), and the second oil guide section (82) can guide oil from the buffer section (83) into the second oil collection area (42).

10. The range hood according to claim 9, characterized in that The first oil collecting area (41) is in an inverted cone shape.

11. The range hood according to claim 10, characterized in that The first oil collecting area (41) is composed of four profiles, namely a front profile (4a), a rear profile (4b), and a left profile (4c) and a right profile (4d) located between the front profile (4a) and the rear profile (4b). The front profile (4a) and the rear profile (4b) form an intersection line (4e), and the intersection line (4e) is the lowest position of the first oil collecting area (41).

12. The range hood according to claim 11, characterized in that The angle α between the rear profile (4b) and the horizontal plane satisfies the following condition: 41.8°≥α≥30.4°.

13. The range hood according to claim 11, characterized in that The range hood also includes A smoke guide plate (7) is arranged on the aforementioned smoke collecting hood (5) and directly faces the aforementioned smoke inlet port, and a smoke inlet gap is formed between the periphery of the smoke guide plate (7) and the lower end surface of the smoke collecting hood (5); an oil collecting groove (71) is formed on the back of the smoke guide plate (7), and the oil collecting groove (71) can receive oil dripping from the oil net (4); The transverse distance between the two sides of the smoke guide plate (7) is greater than the transverse distance between the two sides of the oil net (4); the length of the smoke guide plate (7) is L, the length of the intersection line (4e) is L1, and the length of one end of the intersection line (4e) close to the vertical reference plane at the center of the oil net (4) from the vertical reference plane is L2, satisfying the following conditions: 0.1L≥L1≥0.13L, 0.15L≥L2≥0.2L.

14. The range hood according to claim 13, characterized in that The smoke guide plate (7) is higher at the front and lower at the back and is arranged in an inclined shape.

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