Fan and extractor hood

Abstract

The application provides a fan and an extractor hood, wherein the fan comprises: a shell comprising an air outlet, a cavity communicated with the air outlet, a first side wall extending to the air outlet, and a second side wall extending to the air outlet in a direction away from the first side wall; an impeller arranged in the cavity; a first baffle arranged at the air outlet; and a second baffle arranged on one side of the impeller and located between the first baffle and the second side wall to form a first airflow buffer zone and a second airflow buffer zone on opposite sides of the second baffle respectively; wherein a through hole is formed in each of the first baffle and the second baffle, the first baffle is used for reducing the airflow velocity flowing to the first airflow buffer zone, and the second baffle is used for reducing the airflow velocity flowing out of the air outlet to form air outlets with the same airflow velocity. According to the embodiments provided in the application, air outlets with the same airflow velocity can be formed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of a fan of a vehicle range hood, and particularly relates to a fan and a range hood. BACKGROUND

[0002] Now, centrifugal fans are widely used in various fields, and sufficient installation space can make the fan fully play the advantages of matching performance such as pressure, flow, power and noise. According to the flow law inside the centrifugal fan, the size of the fan outlet and the diameter of the impeller inside the fan are reasonably designed to match each other, which can effectively improve the flow separation phenomenon at the outlet of the fan, and make the centrifugal fan outlet more uniform.

[0003] However, due to the too small installation space, a large-diameter fan cannot be used to match the size of the outlet, which will lead to uneven outlet. SUMMARY

[0004] The present application aims at the shortcomings of the prior art, and provides a fan and a range hood to solve the technical problem that the existing technology cannot use a large-diameter fan to match the size of the outlet due to the too small installation space, which will lead to uneven outlet.

[0005] In a first aspect, the embodiments of the present application provide a fan, comprising: a shell comprising an outlet, a cavity communicated with the outlet, a first side wall extending to the outlet, and a second side wall extending to the outlet in a direction away from the first side wall; an impeller arranged in the cavity; a first baffle arranged at the outlet; and a second baffle arranged on one side of the impeller and located between the first baffle and the second side wall to form a first airflow buffer zone and a second airflow buffer zone on opposite sides of the second baffle, respectively; wherein a through hole is formed in each of the first baffle and the second baffle, the first baffle is used to reduce the flow rate of the airflow flowing to the first airflow buffer zone, and the second baffle is used to reduce the flow rate of the airflow flowing out of the outlet to form an outlet with the same flow rate.

[0006] As an optional implementation, the first baffle and the second baffle are both straight plate structures; wherein the first baffle is connected to the second baffle at an angle, the included angle between the second baffle and the first baffle is greater than or equal to 60 degrees and less than or equal to 95 degrees, and one end of the second baffle away from the first baffle is connected to the second side wall.

[0007] As an optional implementation, the through hole on the first baffle plate comprises a first air outlet hole and a second air outlet hole; the through hole on the second baffle plate comprises a third air outlet hole; the first baffle plate comprises a first air outlet area and a second air outlet area, the first air outlet area corresponds to the first air flow buffer area, and the second air outlet area corresponds to the second air flow buffer area; wherein the first air outlet hole is arranged on the first air outlet area, and the first air outlet hole and the second air outlet hole are arranged on the second air outlet area; the first air outlet hole, the second air outlet hole and the third air outlet hole are circular holes; the diameter of the first air outlet hole is smaller than the diameter of the second air outlet hole, and the diameter of the second air outlet hole is smaller than the diameter of the third air outlet hole.

[0008] As an optional implementation, the fan further comprises a third baffle plate arranged between the second baffle plate and the first side wall and between the impeller and the first baffle plate; wherein the second air flow buffer area is formed on one side of the third baffle plate, and a third air flow buffer area is formed on the opposite side of the third baffle plate.

[0009] As an optional implementation, the third baffle plate comprises a baffle part and a guide part connected together, and a through hole is arranged on the baffle part; wherein the baffle part extends to intersect with the first baffle plate, and the angle is greater than or equal to 20 degrees and less than or equal to 90 degrees.

[0010] As an optional implementation, the distance between the baffle part and the outer surface of the impeller is greater than or equal to 0.05 times the diameter of the impeller and less than or equal to 0.2 times the diameter of the impeller.

[0011] As an optional implementation, the through hole on the first baffle plate comprises a first air outlet hole and a second air outlet hole; the through hole on the second baffle plate comprises a third air outlet hole; the first baffle plate comprises a first air outlet area, a third air outlet area and a fourth air outlet area, the first air outlet area corresponds to the first air flow buffer area, the third air outlet area corresponds to the second air flow buffer area, and the fourth air outlet area corresponds to the third air flow buffer area; wherein the first air outlet hole is arranged on the first air outlet area, the first air outlet hole and the second air outlet hole are arranged on the third air outlet area, and the second air outlet hole is arranged on the fourth air outlet area; the first air outlet hole, the second air outlet hole and the third air outlet hole are circular holes; the diameter of the first air outlet hole is smaller than the diameter of the second air outlet hole, and the diameter of the second air outlet hole is smaller than the diameter of the third air outlet hole.

[0012] As an optional implementation, the fan further comprises a wind guide part arranged at the air outlet and connected to the first side wall and the second side wall, and the wind guide part extends away from the impeller.

[0013] As an optional implementation, the impeller comprises opposite bottom and top walls, and a third side wall connecting the first and second side walls, and the impeller is a cylindrical structure; the fan at least comprises one of the following: a diameter of the impeller is greater than or equal to 0.4 times a distance between the bottom and top walls, and less than or equal to 0.7 times the distance between the bottom and top walls; a distance from a center of the impeller to the first baffle is greater than or equal to 0.4 times a diameter of the impeller, and less than or equal to 0.8 times the diameter of the impeller; a distance from the center of the impeller to the third side wall in a direction opposite to the first baffle is greater than or equal to 0.6 times the diameter of the impeller, and less than or equal to 0.9 times the diameter of the impeller; a distance from the second baffle to an outer surface of the impeller is greater than or equal to 0.5 times the diameter of the impeller, and less than or equal to 0.8 times the diameter of the impeller.

[0014] In a second aspect, the embodiments of the present application provide a range hood, comprising the fan according to any one of the preceding embodiments of the present application.

[0015] The present application provides a fan and a range hood, and the embodiments of the present application at least bring the following beneficial effects:

[0016] The shell wall of the shell, the first baffle and the second baffle located in the shell form a plurality of airflow buffer zones, wherein the airflow with a faster flow rate generated by the impeller flows to the second baffle, enters the first airflow buffer zone after being decelerated by the second baffle, and flows to the first baffle; the airflow with a slower flow rate generated by the impeller flows to the second airflow buffer zone, and flows to the second baffle; the airflow flowing to the second baffle forms the air outlet with the same flow rate after passing through the second baffle.

[0017] The through holes are arranged on the first baffle and the second baffle, which can reduce the flow rate of the airflow, and can also have a certain degree of sound insulation and reflection on the radiation sound field inside the cavity, so as to achieve the effect of noise reduction.

[0018] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above aspects and advantages of the present application and / or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A structural schematic diagram of a fan provided by the embodiments of the present application is shown in FIG. 1;

[0021] Figure 2 A distribution schematic diagram of an airflow buffer zone in a fan provided by the embodiments of the present application is shown in FIG. 2.

[0022] Figure 3 A connection relationship diagram of a middle shell, a guide part and a first baffle in a fan is provided for the embodiment of the present application;

[0023] Figure 4 A structure diagram of a second baffle in a fan is provided for the embodiment of the present application;

[0024] Figure 5 A structure diagram of a first baffle in a fan is provided for the embodiment of the present application;

[0025] Figure 6 A structure diagram of a first baffle in another fan is provided for the embodiment of the present application;

[0026] Figure 7 A structure diagram of a first baffle in still another fan is provided for the embodiment of the present application;

[0027] Figure 8 A structure diagram of a third baffle in a fan is provided for the embodiment of the present application.

[0028] In which, the following is the description of the reference signs:

[0029] 1: shell; 11: air outlet; 12: cavity; 121: first sub-cavity; 122: second sub-cavity; 13: first side wall; 14: second side wall;

[0030] 2: impeller;

[0031] 3: first baffle; 31: first air outlet hole; 32: second air outlet hole; 33: first air outlet area; 34: second air outlet area; 35: third air outlet area; 36: fourth air outlet area;

[0032] 4: second baffle; 41: third air outlet hole;

[0033] 5: first air flow buffer area;

[0034] 6: second air flow buffer area;

[0035] 7: third baffle; 71: baffle part; 72: guide part;

[0036] 8: third air flow buffer area;

[0037] 9: air guide part. DETAILED DESCRIPTION

[0038] The present application is described in detail below, examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar components or components having the same or similar functions throughout. In addition, if a detailed description of the known art is unnecessary for the features of the present application shown, it is omitted. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and cannot be interpreted as a limitation on the present application.

[0039] Those skilled in the art can understand that, unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with meanings in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such herein.

[0040] Those skilled in the art can understand that, unless otherwise stated, the singular form "a", "an", "said" and "the" used herein can also include the plural form. It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, operations, elements and / or components exist, but does not exclude the presence or addition of one or more other features, integers, operations, elements, components and / or groups thereof. It should be understood that when we say an element is "connected" to another element, it can be directly connected to the other element, or there can be intermediate elements. In addition, "connected" used herein can include wireless connection.

[0041] As Figures 1-2 As shown in the drawings, the present application provides a fan, mainly comprising a shell 1, an impeller 2, a first baffle 3 and a second baffle 4. The shell 1 comprises an air outlet 11, a cavity 12 communicated with the air outlet 11, a first side wall 13 extending to the air outlet 11, and a second side wall 14 extending to the air outlet 11 in a direction away from the first side wall 13; the impeller 2 is arranged in the cavity 12; the first baffle 3 is arranged at the air outlet 11; the second baffle 4 is arranged on one side of the impeller 2 and located between the first baffle 3 and the second side wall 14, so as to form a first airflow buffer zone 5 and a second airflow buffer zone 6 on opposite sides of the second baffle 4, respectively; wherein the first baffle 3 and the second baffle 4 are both provided with through holes, the second baffle 4 is used to reduce the flow rate of the airflow flowing to the first airflow buffer zone 5, and the first baffle 3 is used to reduce the flow rate of the airflow flowing out of the air outlet 11, so as to form the same outflow rate.

[0042] In some possible embodiments, the shell wall of the shell 1 comprises a top wall, a bottom wall and side walls, the side walls comprising a first side wall 13 and a second side wall 14. The top wall and the bottom wall can each be a flat plate structure and arranged in parallel. The bottom wall can be arranged horizontally, the shell 1 can have a trapezoidal cross-sectional shape in the horizontal direction, the first side wall 13 and the second side wall 14 can be the legs of the trapezoidal shape, and the air outlet of the shell 1 is located at the lower base of the trapezoidal shape.

[0043] The air outlet of the shell 1 can have a long rectangular cross-sectional shape in the longitudinal direction, the long side of the long rectangular shape is much larger than the short side, the short side is the height of the shell 1, thereby forming a "narrow and long" air outlet structure. The first baffle 3 is arranged along the extension direction of the long side of the long rectangular shape and located in the shell 1. The shell 1 and the first baffle 3 form a cavity 12, the impeller 2 is arranged in the cavity 12 and close to the upper base of the aforementioned trapezoidal cross-section. The impeller 2 can have a cylindrical structure and be arranged vertically in the axial direction. The impeller 2 generates air flow by rotating in the direction towards the first baffle 3, i.e. rotating in the circumferential direction. The air flow generated by the impeller 2 has different flow rates under the action of the shell wall of the shell 1 and flows in different directions.

[0044] The through holes are arranged on the first baffle 3 and the second baffle 4. On the one hand, the through holes can reduce the flow rate of the air flow. On the other hand, the through holes can have a certain degree of sound insulation and reflection on the radiation sound field inside the cavity 12, thereby achieving the effect of noise reduction.

[0045] The fan provided by the embodiments of the present application has the shell wall of the shell 1 and the first baffle 3 and the second baffle 4 arranged in the shell 1 to form a plurality of air flow buffer zones. The air flow with a high flow rate generated by the impeller 2 flows to the second baffle 4, enters the first air flow buffer zone 5 after being decelerated by the second baffle 4, and flows to the first baffle 3. The air flow with a low flow rate generated by the impeller 2 flows to the second air flow buffer zone 6 and flows to the second baffle 4. The air flow flowing to the second baffle 4 has the same flow rate after passing through the second baffle 4.

[0046] As shown in FIG. 1, the first baffle 3 and the second baffle 4 are straight plate structures. Figures 1-4 As an optional implementation, the first baffle 3 and the second baffle 4 are straight plate structures. The first baffle 3 is connected to the second baffle 4 at an angle. The included angle between the second baffle 4 and the first baffle 3 is greater than or equal to 60 degrees and less than or equal to 95 degrees. The end of the second baffle 4 away from the first baffle 3 is connected to the second side wall 14.

[0047] Based on the foregoing embodiments, some possible embodiments are provided, the first side wall 13 is a straight plate structure, and is connected at an angle with the first baffle 3. The second baffle 4 is arranged between the second side wall 14 and the impeller 2, and is connected to the first baffle 3 and the second side wall 14. By controlling the angle at which the second baffle 4 intersects the first baffle 3, the cavity 12 can be divided into an adapted first sub-cavity and a second sub-cavity, the first airflow buffer zone 5 is located in the first sub-cavity, and the second airflow buffer zone 6 and the impeller 2 are located in the second sub-cavity; the airflow flow rate entering the first airflow buffer zone 5 can also be controlled.

[0048] As shown in Figures 5-7 , as an optional embodiment, the through hole on the first baffle 3 includes a first air outlet hole 31 and a second air outlet hole 32; the through hole on the second baffle 4 includes a third air outlet hole 41; the first baffle 3 includes a first air outlet area 33 and a second air outlet area 34, the first air outlet area 33 corresponds to the first airflow buffer zone 5, and the second air outlet area 34 corresponds to the second airflow buffer zone 6; wherein the first air outlet hole 31 is arranged on the first air outlet area 33, the first air outlet hole 31 and the second air outlet hole 32 are arranged on the second air outlet area 34, the first air outlet hole 31, the second air outlet hole 32 and the third air outlet hole 41 are all circular holes, the diameter of the first air outlet hole 31 is smaller than the diameter of the second air outlet hole 32, and the diameter of the second air outlet hole 32 is smaller than the diameter of the third air outlet hole 41.

[0049] Based on the foregoing embodiments, some possible embodiments are provided, the first baffle 3 is provided with a first air outlet hole 31 and a second air outlet hole 32 along the thickness direction, and the second baffle 4 is provided with a third air outlet hole 41 along the thickness direction; the first air outlet hole 31, the second air outlet hole 32 and the third air outlet hole 41 are air outlet holes with different diameters to respectively realize the deceleration effect on the airflow. Since the airflow flowing to the first airflow buffer zone 5 has a relatively large speed, it is first decelerated through the third air outlet hole 41, and then decelerated again through the first air outlet hole 31 in order to increase the deceleration effect; the airflow flowing to the second airflow buffer zone 6 has a relatively small speed, and can be decelerated through the second air outlet hole 32 to achieve the same speed airflow. In order to achieve the effect of uniform air outlet, the first air outlet hole 31 is arranged in concentration to form a first air outlet area 33, and corresponds to the first airflow buffer zone 5, and the second air outlet hole 32 is arranged in concentration to form a second air outlet area 34, and corresponds to the second airflow buffer zone 6. A small amount of first air outlet holes 31 can be arranged on the part of the second air outlet area 34 close to the first air outlet area 33 to realize the transition effect, and thus more uniform air outlet is obtained.

[0050] As shown in Figure 8As an optional embodiment, the fan further comprises a third baffle 7, which is arranged between the second baffle 4 and the first side wall 13, and between the impeller 2 and the first baffle 3; wherein the second airflow buffer area 6 is formed on one side of the third baffle 7, and a third airflow buffer area 8 is formed on the opposite side of the third baffle 7.

[0051] Based on the foregoing embodiments, some possible embodiments are provided. Due to the shape and size of the shell 1, the shape and size of the first baffle 3 and the second baffle 4, the shape and size of the through hole on the first baffle 3 and the second baffle 4, and the efficiency of the impeller 2, and other factors, different airflow velocities can exist in the second sub-cavity. The third baffle 7 can be arranged in the second sub-cavity to divide the second sub-cavity into the second airflow buffer area 6 and the third airflow buffer area 8, slow down the different airflow velocities existing in the second sub-cavity, and obtain uniform air outlet.

[0052] As an optional embodiment, the third baffle 7 comprises a baffle portion 71 and a guide portion 72 connected to each other, and a through hole is formed in the baffle portion 71; wherein the baffle portion 71 extends to intersect the first baffle 3 at an angle greater than or equal to 20 degrees and less than or equal to 90 degrees.

[0053] Based on the foregoing embodiments, some possible embodiments are provided. The baffle portion 71 and the guide portion 72 are both plate-shaped structures. The baffle portion extends away from the first baffle 3 and is close to the second baffle 4. The guide portion 72 extends toward the first baffle 3, and the guide portion 72 can extend to the first baffle 3.

[0054] As an optional embodiment, the distance between the baffle portion 71 and the outer surface of the impeller 2 is greater than or equal to 0.05 times the diameter of the impeller 2 and less than or equal to 0.2 times the diameter of the impeller 2.

[0055] As an optional embodiment, the through hole on the first baffle 3 comprises a first air outlet hole 31 and a second air outlet hole 32; the through hole on the second baffle 4 comprises a third air outlet hole 41; the first baffle 3 comprises a first air outlet area 33, a third air outlet area 35, and a fourth air outlet area 36. The first air outlet area 33 corresponds to the first airflow buffer area 5, the third air outlet area 35 corresponds to the second airflow buffer area 6, and the fourth air outlet area 36 corresponds to the third airflow buffer area 8; wherein the first air outlet hole 31 is formed on the first air outlet area 33, the first air outlet hole 31 and the second air outlet hole 32 are formed on the third air outlet area 35, the second air outlet hole 32 is formed on the fourth air outlet area 36, the first air outlet hole 31, the second air outlet hole 32, and the third air outlet hole 41 are all circular holes, the diameter of the first air outlet hole 31 is smaller than the diameter of the second air outlet hole 32, and the diameter of the second air outlet hole 32 is smaller than the diameter of the third air outlet hole 41.

[0056] Based on the foregoing embodiment, some possible embodiments are provided, the first baffle 3 is provided with a first air outlet hole 31 and a second air outlet hole 32 in the thickness direction, and the second baffle 4 is provided with a third air outlet hole 41 in the thickness direction; the first air outlet hole 31, the second air outlet hole 32 and the third air outlet hole 41 are air outlet holes with different diameters to respectively realize the deceleration effect on the airflow, since the airflow speed to the first airflow buffer area 5 is large, the airflow is first decelerated by the third air outlet hole 41 for the first time, and in order to increase the deceleration effect, the airflow is secondly decelerated by the first air outlet hole 31; the airflow speed to the second airflow buffer area 6 is small, and the airflow can be decelerated by the second air outlet hole 32 to reach the airflow with the same speed. In order to realize the effect of uniform air outlet, the first air outlet hole 31 is concentratedly arranged to form a first air outlet area 33 and correspond to the first airflow buffer area 5, the second air outlet hole 32 is concentratedly arranged to form a fourth air outlet area 36 and correspond to the third airflow buffer area 8; the first air outlet hole 31 and the second air outlet hole 32 are mixedly arranged to form a third air outlet area 35 and correspond to the second airflow buffer area 6, wherein a small amount of first air outlet holes 31 can be arranged in the part of the third air outlet area 35 close to the first air outlet area 33, and the rest of the part is concentratedly arranged with the second air outlet hole 32 to realize the transition effect and further obtain more uniform air outlet.

[0057] In another possible embodiment, different from the foregoing embodiment, the fourth air outlet area 36 is provided with a fourth air outlet hole, that is, part of the fourth air outlet area 36 can not be shielded.

[0058] As an optional implementation, the fan further includes a guide part 9 arranged at the air outlet 11 and connected to the first side wall 13 and the second side wall 14, and the guide part 9 extends in a direction away from the impeller 2.

[0059] Based on the foregoing embodiment, some possible embodiments are provided, the guide part 9 includes a guide wall, the guide wall surrounds to form a ring structure, the ring structure is the air outlet 11 of the housing 1, and the longitudinal section of the ring structure is a rectangle; each guide wall can be arranged perpendicularly to the first baffle 3, the first baffle 3 is arranged in the guide part 9 and connected to the guide part 9.

[0060] As an optional implementation, the impeller 2 includes opposite bottom and top walls, and a third side wall connecting the first side wall 13 and the second side wall 14, and the impeller 2 is a cylindrical structure; the fan at least includes one of the following:

[0061] The diameter of the impeller 2 is greater than or equal to 0.4 times the distance between the bottom wall and the top wall and less than or equal to 0.7 times the distance between the bottom wall and the top wall; the distance from the center of the impeller 2 to the first baffle 3 is greater than or equal to 0.4 times the diameter of the impeller 2 and less than or equal to 0.8 times the diameter of the impeller 2; the distance from the center of the impeller 2 to the third side wall in the direction opposite to the first baffle 3 is greater than or equal to 0.6 times the diameter of the impeller 2 and less than or equal to 0.9 times the diameter of the impeller 2; the distance from the second baffle 4 to the outer surface of the impeller 2 is greater than or equal to 0.5 times the diameter of the impeller 2 and less than or equal to 0.8 times the diameter of the impeller 2.

[0062] The distance from the center of the impeller 2 to the third side wall in the direction opposite to the first baffle 3 is greater than or equal to 0.6 times the diameter of the impeller 2 and less than or equal to 0.9 times the diameter of the impeller 2, which can ensure that the airflow has good passability, effectively avoids airflow congestion caused by a too narrow flow channel, and also prevents flow separation caused by a too wide flow channel.

[0063] Optionally, the diameter of the impeller 2 is 0.6 times the distance between the bottom wall and the top wall.

[0064] Based on the same inventive concept, the embodiments of the present application provide a range hood, which comprises the fan of any one of the preceding embodiments of the present application.

[0065] The fan of the range hood in the embodiments of the present application is used to blow air in a relatively hot environment, to cool the cooking environment and provide a convenient cooking environment for the user, or to cool the user and improve the user's cooking experience.

[0066] The present application provides a fan and a range hood, and the technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0067] The shell wall of the shell 1 and the first baffle 3 and the second baffle 4 located in the shell 1 form a plurality of airflow buffer zones, wherein the airflow with a relatively fast flow rate generated by the impeller 2 flows to the second baffle 4, enters the first airflow buffer zone 5 after being decelerated by the second baffle 4, and flows to the first baffle 3; the airflow with a relatively slow flow rate generated by the impeller 2 flows to the second airflow buffer zone 6 and flows to the second baffle 4; the airflow flowing to the second baffle 4 forms the air outlet with the same flow rate after passing through the second baffle 4.

[0068] The through holes are formed in the first baffle 3 and the second baffle 4, which can reduce the flow rate of the airflow and also have a certain degree of sound insulation and reflection on the radiation sound field inside the cavity 12, thereby achieving the effect of noise reduction.

[0069] Those skilled in the art can understand that the steps, measures, and schemes in various operations, methods, and processes discussed in the present application can be alternated, changed, combined, or deleted. Further, other steps, measures, and schemes in various operations, methods, and processes discussed in the present application can also be alternated, changed, rearranged, decomposed, combined, or deleted. Further, steps, measures, and schemes in various operations, methods, and processes in the prior art can also be alternated, changed, rearranged, decomposed, combined, or deleted.

[0070] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0071] The terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0072] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0074] It should be understood that although the steps in the flowcharts of the drawings are shown in a sequential order following the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated otherwise herein, the execution of the steps is not strictly limited to the order indicated by the arrows, and can be executed in other orders. Moreover, at least some of the steps in the flowcharts of the drawings can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of which is not necessarily sequential, but can be round-robin or alternating with at least some of the other steps or sub-steps or stages of other steps.

[0075] The above only describes some embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A fan, characterized by, The fan comprises: a housing (1) comprising an air outlet (11), a cavity (12) communicating with the air outlet (11), a first side wall (13) extending to the air outlet (11), and a second side wall (14) extending to the air outlet (11) in a direction away from the first side wall (13); a fan blade (2) arranged in the cavity (12); a first baffle (3) arranged at the air outlet (11); a second baffle (4) arranged on one side of the fan blade (2) and located between the first baffle (3) and the second side wall (14) to form a first air flow buffer area (5) and a second air flow buffer area (6) on opposite sides of the second baffle (4); a third baffle (7) arranged between the second baffle (4) and the first side wall (13) and between the fan blade (2) and the first baffle (3); the second air flow buffer area (6) is formed on one side of the third baffle (7), and a third air flow buffer area (8) is formed on the side of the third baffle (7) opposite to the second air flow buffer area (6); wherein the first baffle (3), the second baffle (4) and the third baffle (7) are all provided with through holes, and the first baffle (3) is angularly connected to the second baffle (4); the second baffle (4) is further arranged between the second side wall (14) and the fan blade (2), and an end of the second baffle (4) away from the first baffle (3) is connected to the second side wall (14); the second baffle (4) is used to reduce the flow rate of air flowing to the first air flow buffer area (5), and the first baffle (3) is used to reduce the flow rate of air flowing out of the air outlet (11) to form air with the same flow rate.

2. The fan according to claim 1, wherein: the first baffle (3) and the second baffle (4) are both straight plate structures; wherein the included angle between the second baffle (4) and the first baffle (3) is greater than or equal to 60 degrees and less than or equal to 95 degrees.

3. The fan according to claim 1, wherein: the through hole on the first baffle (3) comprises a first air outlet hole (31) and a second air outlet hole (32); the through hole on the second baffle (4) comprises a third air outlet hole (41); the first baffle (3) comprises a first air outlet area (33) and a second air outlet area (34), the first air outlet area (33) corresponds to the first air flow buffer area (5), and the second air outlet area (34) corresponds to the second air flow buffer area (6). The first air outlet hole (31) is arranged on the first air outlet area (33), the first air outlet hole (31) and the second air outlet hole (32) are arranged on the third air outlet area (35), and the second air outlet hole (32) is arranged on the fourth air outlet area (36).

4. The fan of claim 1, wherein, The third baffle (7) comprises: A connecting portion (71) and a guide portion (72), and a through hole is arranged on the connecting portion (71); The connecting portion (71) extends to intersect with the first baffle (3) at an angle greater than or equal to 20 degrees and less than or equal to 90 degrees.

5. The fan according to claim 4, wherein The distance between the connecting portion (71) and the outer surface of the impeller (2) is greater than or equal to 0.05 times the diameter of the impeller (2) and less than or equal to 0.2 times the diameter of the impeller (2).

6. The fan according to any one of claims 1-5, wherein The through hole on the first baffle (3) comprises a first air outlet hole (31) and a second air outlet hole (32); The through hole on the second baffle (4) comprises a third air outlet hole (41); The first baffle (3) comprises a first air outlet area (33), a third air outlet area (35) and a fourth air outlet area (36), the first air outlet area (33) corresponds to the first airflow buffer area (5), the third air outlet area (35) corresponds to the second airflow buffer area (6), and the fourth air outlet area (36) corresponds to the third airflow buffer area (8); The first air outlet hole (31) is arranged on the first air outlet area (33), the first air outlet hole (31) and the second air outlet hole (32) are arranged on the third air outlet area (35), and the second air outlet hole (32) is arranged on the fourth air outlet area (36). The first air outlet hole (31), the second air outlet hole (32) and the third air outlet hole (41) are circular holes, the diameter of the first air outlet hole (31) is smaller than the diameter of the second air outlet hole (32), and the diameter of the second air outlet hole (32) is smaller than the diameter of the third air outlet hole (41).

7. The fan of claim 1, wherein, Further comprising: A wind guide portion (9) is arranged at the air outlet (11) and connected to the first side wall (13) and the second side wall (14), and the wind guide portion (9) extends away from the impeller (2).

8. The fan of claim 1, wherein, The impeller (2) comprises opposite bottom and top walls, the shell (1) further comprises a third side wall connecting the first side wall (13) and the second side wall (14), and the impeller (2) is in a cylindrical structure; the fan at least comprises one of the following: The diameter of the impeller (2) is greater than or equal to 0.4 times the distance between the bottom wall and the top wall and less than or equal to 0.7 times the distance between the bottom wall and the top wall. The distance from the center of the impeller (2) to the first baffle (3) is greater than or equal to 0.4 times the diameter of the impeller (2) and less than or equal to 0.8 times the diameter of the impeller (2); The distance from the center of the impeller (2) to the third side wall in the direction opposite to the first baffle (3) is greater than or equal to 0.6 times the diameter of the impeller (2) and less than or equal to 0.9 times the diameter of the impeller (2); The distance from the second baffle (4) to the outer surface of the impeller (2) is greater than or equal to 0.5 times the diameter of the impeller (2) and less than or equal to 0.8 times the diameter of the impeller (2).

9. A range hood characterized by, Comprising: The fan of any one of claims 1-8.

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