Impeller structure, fan and range hood

Abstract

The utility model discloses an impeller structure, a fan and a range hood, and the impeller structure comprises a base body and a plurality of blades. The blades are embedded in the base body and annularly and evenly distributed on the periphery of the base body, and an airflow channel is formed between every two adjacent blades. A plurality of grooves are formed in the circumferential faces of the two opposite sides of each blade in the length direction at intervals so that two opposite sawtooth-shaped side lines can be formed. The utility model relates to the technical field of household appliances, and through the zigzag side lines formed by arranging the grooves on the circumferential surfaces of the two sides of the blades at intervals along the length direction, the wind disturbing capability of the impeller structure during rotation is further improved, the working noise is reduced, and the working performance of the impeller structure, the fan and the range hood is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an impeller structure, a fan and a range hood. Background Art

[0002] Range hoods, also known as exhaust hoods, are kitchen appliances that purify the kitchen environment. Usually, household range hoods are installed above the kitchen stove, which can quickly extract the waste from stove combustion and the oil smoke generated during cooking that is harmful to the human body and discharge them outdoors. At the same time, they condense and collect the oil smoke, reduce pollution, purify the air, and have anti-toxic and explosion-proof safety protection functions.

[0003] As the most important component in a range hood, the fan is usually used to guide the airflow from the kitchen to the outside, thereby realizing the sewage discharge function of the range hood, and the specific structure of the impeller structure in the fan affects the performance of the fan in guiding the airflow, such as wind cooling, wind pressure, etc. In the related art, the impeller structure is mostly a ring-shaped arrangement of ordinary blades on a base to achieve the effect of generating suction during rotation, but there is still a phenomenon of large rotation noise and large air volume loss, which affects the performance of the fan and the range hood, and still needs further improvement. Utility Model Content

[0004] The main purpose of the utility model is to provide an impeller structure, a fan and a range hood, aiming to improve the deficiencies of the above-mentioned prior art and further improve the wind disturbance capability and working stability of the impeller structure.

[0005] To achieve the above-mentioned purpose, the impeller structure proposed in the utility model includes a base and a plurality of blades; the plurality of blades are embedded in the base and evenly distributed in a ring shape around the periphery of the base, and an air flow channel is formed between two adjacent blades; wherein, each of the blades has a plurality of grooves spaced apart along the length direction on the opposite side circumferences to form two opposite serrated edge lines.

[0006] In some embodiments of the present invention, the cross-section of the blade is bent in an arc shape, and the bending directions of the multiple blades are arranged in a clockwise direction along the periphery of the base; or, the bending directions of the multiple blades are arranged in a counterclockwise direction along the periphery of the base.

[0007] In some embodiments of the present invention, the outer contour line of the blade cross section is arranged in the form of an Archimedean spiral.

[0008] In some embodiments of the present invention, two adjacent grooves are arranged with an arc transition; and / or the bottom wall surface of the groove is an arc surface.

[0009] In some embodiments of the present invention, the two rows of grooves disposed on both side circumferences of each blade are staggered.

[0010] In some embodiments of the utility model, the base includes a middle disk, a rear end ring and a front end ring; a plurality of blades are inserted through the middle disk, and the middle portion of the blade is fixedly connected to the periphery of the middle disk; the rear end ring has a ring-shaped cross-section, and one end of the blade is fixedly connected to the wall of the rear end ring close to the middle disk; the front end ring has a ring-shaped cross-section, and the middle disk is clamped between the rear end ring and the front end ring, and the end of the blade facing away from the rear end ring is fixedly connected to the wall of the front end ring close to the middle disk.

[0011] In some embodiments of the present invention, the distance between the rear end ring and the middle disk is greater than the distance between the front end ring and the middle disk.

[0012] The utility model also provides a fan, including a volute, a motor and an impeller structure as described in any of the above embodiments; the volute is formed with an air suction port arranged in the extension direction of the blade; the motor is fixedly connected to the side of the volute close to the air suction port; the impeller structure is fixedly connected to the volute, the base is formed with a motor hole, and the motor at least partially extends into the air suction port and is penetrated through the motor hole.

[0013] In some embodiments of the present invention, the fan includes a plurality of impeller structures, the plurality of impeller structures are sequentially connected along the extension direction of the blades, and the blades of each impeller structure are staggered with the blades of an adjacent impeller structure.

[0014] The utility model also provides a range hood, comprising a chassis and a fan as described in any one of the above embodiments, wherein the fan is arranged in the chassis, and the volute is further formed with an air outlet extending toward the top of the chassis.

[0015] Compared with the prior art, the impeller structure proposed in the technical solution of the utility model has the following beneficial effects:

[0016] A base and a plurality of blades are provided in the impeller structure. The plurality of blades are embedded in the base and evenly distributed in an annular manner on the periphery of the base, and an air flow channel is formed between two adjacent blades; wherein, a plurality of grooves are provided at intervals along the length direction on the circumference of the two opposite sides of each blade to form two opposite serrated edges. Thus, the serrated edges formed by the grooves provided at intervals along the length direction on the circumference of the two opposite sides of the blade further increase the wind disturbance capability of the impeller structure when rotating, reduce the working noise, and further improve the working performance of the impeller structure, the fan, and the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the impeller structure of the utility model;

[0019] Figure 2 for Figure 1 A front view of an embodiment of the present invention;

[0020] Figure 3 for Figure 1 A cross-sectional view of an embodiment of the present invention;

[0021] Figure 4 for Figure 1 A cross-sectional view of another embodiment of the present invention;

[0022] Figure 5 This is a structural schematic diagram of an embodiment of a fan of the utility model;

[0023] Figure 6 It is a structural schematic diagram of an embodiment of the range hood of the utility model.

[0024] Description of Figure Numbers:

[0025] 1000, range hood; 100, fan; 10, impeller structure; 11, base; 111, middle plate; 113, rear end ring; 115, front end ring; 117, motor hole; 13, blades; 15, grooves; 30, volute; 31, air intake; 33, air outlet; 300, chassis.

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] The following is combined with Figures 1 to 6 The utility model is further described in detail. Figure 1 This is a structural schematic diagram of an embodiment of the impeller structure of the utility model; Figure 2 for Figure 1 A front view of an embodiment of the present invention; Figure 3 for Figure 1 A cross-sectional view of an embodiment of the present invention; Figure 4 for Figure 1 A cross-sectional view of another embodiment of the present invention; Figure 5 This is a structural schematic diagram of an embodiment of a fan of the utility model; Figure 6 It is a structural schematic diagram of an embodiment of the range hood of the utility model.

[0032] Range hoods, also known as exhaust hoods, are kitchen appliances that purify the kitchen environment. Usually, household range hoods are installed above the kitchen stove, which can quickly extract the waste from stove combustion and the oil smoke generated during cooking that is harmful to the human body and discharge them outdoors. At the same time, they condense and collect the oil smoke, reduce pollution, purify the air, and have anti-toxic and explosion-proof safety protection functions.

[0033] As the most important component in a range hood, the fan is usually used to guide the airflow from the kitchen to the outside, thereby realizing the sewage discharge function of the range hood, and the specific structure of the impeller structure in the fan affects the performance of the fan in guiding the airflow, such as wind cooling, wind pressure, etc. In the related art, the impeller structure is mostly a ring-shaped arrangement of ordinary blades on a base to achieve the effect of generating suction during rotation, but there is still a phenomenon of large rotation noise and large air volume loss, which affects the performance of the fan and the range hood, and still needs further improvement.

[0034] In order to improve the deficiencies of the above-mentioned prior art, the utility model proposes an impeller structure 10, comprising a base 11 and a plurality of blades 13; the plurality of blades 13 are embedded in the base 11 and evenly distributed in a ring shape around the periphery of the base 11, and an air flow channel is formed between two adjacent blades 13; wherein, each blade 13 has a plurality of grooves 15 spaced apart along the length direction on the opposite side circumferences to form two opposite serrated edge lines.

[0035] It can be understood that the multiple blades 13 embedded in the base 11 in the impeller structure 10 form an air flow channel. During the operation of the impeller structure 10, the multiple blades 13 rotate around the shape center of the base 11 and the periphery of the base 11, forming an air inlet end and an air outlet end along the extension direction of the blades 13. The air entering the impeller structure 10 from the air inlet end is affected by the rotation of the blades 13, and its kinetic energy is converted into static pressure energy. The blades 13 accelerate and compress the air, further increasing the pressure and temperature of the air. The compressed air will be pushed to the other air outlet end located at the blade 13 relative to the air inlet end. The accelerated and compressed air is pushed from the air inlet end toward the air outlet end, and the flow direction is guided by the air flow channel formed by the two adjacent blades 13. Finally, the air is discharged from the impeller structure 10 from the air outlet end.

[0036] Specifically, during the operation of the impeller structure 10, the flow efficiency and performance of the air flowing from the air inlet end to the air outlet end are affected by the blades 13. A plurality of grooves 15 are provided on the circumferential surfaces on both sides of each blade 13 at intervals along the length direction to form two opposite serrated edges. In this way, the friction between the air and the edge of the blade 13 is reduced, thereby reducing the noise that may be generated by the friction between the air and the blade 13, further reducing the working noise of the impeller structure 10, and further improving the user experience. On the other hand, the serrated edges reduce the friction between the air and the edge of the blade 13, that is, reducing the resistance encountered by the air during the flow process, further improving the aerodynamic performance of the wind wheel, and reducing the possibility of turbulence or airflow separation caused by the edge resistance of the blade 13, that is, further improving the aerodynamic efficiency and working performance of the impeller structure 10.

[0037] In some embodiments of the present invention, Figures 1 to 4 The cross section of the blade 13 is curved in an arc shape, and the bending direction of the plurality of blades 13 is arranged in a clockwise direction along the periphery of the base 11; or, the bending direction of the plurality of blades 13 is arranged in a counterclockwise direction along the periphery of the base 11.

[0038] It can be understood that the arc-shaped cross-section of the blade 13 is further reduced to further reduce the turbulence loss and air flow resistance at the edge of the blade 13. The arc-shaped blade 13 has a curved surface on the side wall in the extension direction, which guides the air flow process and avoids the possibility of airflow being obstructed on the surface of the blade 13 and forming airflow selection, further reducing the noise or vibration that may be generated by the airflow during the operation of the impeller structure 10, thereby improving the aerodynamic efficiency and working performance of the impeller structure 10.

[0039] It should be noted that the bending directions of the multiple blades 13 are arranged in sequence along the periphery of the base 11 in a clockwise direction or a counterclockwise direction, so that the impact and stress generated by the airflow impact that the multiple blades 13 may be subjected to during the operation of the impeller structure 10 are evenly shared, further increasing the structural strength and rigidity distribution of the blades 13, and extending the service life of the blades 13 and the impeller structure 10. Specifically, the shape, radius curvature and angle distribution of the arc bend of the blades 13 can be adjusted according to the specific application scenario, and this application does not make specific limitations on this.

[0040] In some embodiments of the present invention, Figures 1 to 3 As shown, the outer contour line of the cross section of the blade 13 is arranged in the form of an Archimedean spiral.

[0041] It can be understood that the Archimedean spiral is a special curve, which is characterized by a uniform increase in elevation at a certain angle and distance. The outer contour line of the cross section of the blade 13 is set in the form of an Archimedean spiral, so that the air flow channel formed between two adjacent blades 13 has a relatively uniformly increased flow space, which reduces the turbulence and resistance of the air when entering the impeller structure 10, and further improves the working efficiency and wind disturbance ability of the impeller structure 10. Specifically, it can be determined according to the design requirements and manufacturing process. The parameters in the Archimedean spiral are not specifically limited in this application.

[0042] In some embodiments of the present invention, Figures 1 to 4 , there is an arc transition between two adjacent grooves 15; and / or, the bottom wall surface of the groove 15 is an arc surface.

[0043] It can be understood that the end surface between two adjacent grooves 15 is still in contact with the airflow flowing in the airflow channel during the operation of the impeller structure 10, and rubs against it and generates resistance to it. The arc transition between the two adjacent grooves 15 is set, so that no edges and corners are generated between the grooves 15 due to shape changes, thereby reducing the formation of turbulence and the resistance loss of the airflow at this location, reducing the discontinuity of air flow, allowing air to pass through the edge of the blade 13 more smoothly, reducing the occurrence of turbulence, thereby reducing airflow resistance loss, further improving the aerodynamic efficiency and working performance of the blade 13 and the impeller structure 10, and also reducing airflow separation and pressure fluctuations, creating a smoother airflow flow environment, reducing noise or vibration that may be generated during air flow, and further improving the working stability of the impeller structure 10.

[0044] In some embodiments of the present invention, the two rows of grooves 15 disposed on the two side circumferences of each blade 13 are staggered.

[0045] It can be understood that the two rows of grooves 15 respectively arranged on the two sides of each blade 13 are staggered, which can reduce the friction between the air and the edge of the blade 13 and reduce the working noise, while further improving the airflow dynamics at the edge of the blade 13. When the air passes through the offset grooves 15, vortices and turbulence can be generated at different positions. The stresses exerted on the blade 13 by the vortices and turbulence generated by the air on the opposite sides at least partially offset each other, further improving the structural stability of the blade 13 and reducing the vibration or deformation that may be generated by the blade 13 during the operation of the impeller structure 10. At the same time, when the air flows through the offset grooves 15, the presence of the grooves 15 will cause the separation and mixing of the airflow, reduce the airflow shear and pressure loss at the edge, and then reduce the resistance loss, that is, further improve the aerodynamic performance and working efficiency of the blade 13 and the impeller structure 10.

[0046] In some embodiments of the present invention, Figures 1 to 4 The base 11 includes a middle disk 111, a rear end ring 113 and a front end ring 115; a plurality of blades 13 are inserted through the middle disk 111, and the middle of the blade 13 is fixedly connected to the periphery of the middle disk 111; the cross section of the rear end ring 113 is annular, and one end of the blade 13 is fixedly connected to the wall of the rear end ring 113 close to the middle disk 111; the cross section of the front end ring 115 is annular, and the middle disk 111 is clamped between the rear end ring 113 and the front end ring 115, and one end of the blade 13 away from the rear end ring 113 is fixedly connected to the wall of the front end ring 115 close to the middle disk 111.

[0047] It should be noted that the front ring 115 is an annular structure located at the air inlet end of the impeller structure 10, and is used to fix the end of the blade 13 on one side close to the air inlet end. The middle disk 111 is an annular or disk-shaped structure connected to the axial direction of the blade 13, and is used to fix the middle of the blade 13, and is also used to transfer the force and torque applied to the blade 13. The rear ring 113 is an annular structure located on the side of the impeller structure 10 away from the air inlet end, and is used to fix the end of the blade 13 on one side away from the front ring 115. The front ring 115, the middle disk 111 and the rear ring 113 together fix the blade 13 and prevent it from moving or deforming during the operation of the impeller structure 10, ensuring that the blade 13 and other components of the impeller structure 10 have a relatively fixed positional relationship, and also ensuring the angle and position consistency of multiple blades 13 relative to each other during the rotation process, and avoiding the vibration, deformation or noise caused by the impact of airflow on the blade 13 during the operation process, further improving the stability of the operation process of the impeller structure 10.

[0048] It can be understood that the front ring 115, the middle disk 111 and the rear ring 113 also reduce the turbulence or vortex that may be generated in the parts of the blades 13 connected thereto, so that the blades 13 can correctly capture and guide the air flow entering the impeller, reduce the airflow separation and resistance loss that may be generated at the edge, and further improve the aerodynamic efficiency of the impeller structure 10.

[0049] In some embodiments of the present invention, Figure 1 , Figure 2 and Figure 4 , the distance between the rear end ring 113 and the middle plate 111 is greater than the distance between the front end ring 115 and the middle plate 111 .

[0050] It can be understood that the air inlet end of the impeller structure 10 is close to the front end ring 115 and is arranged in the extension direction of the blade 13, and the air outlet end is located on the side away from the front end ring 115, which is not the same as the extension direction of the blade 13. Preferably, it is arranged on the side perpendicular to the extension direction of the blade 13 between the rear end ring 113 and the middle disk 111. During the operation of the impeller structure 10, the airflow entering the impeller structure 10 from the air inlet section will change its own flow direction between the rear end ring 113 and the middle disk 111. The airflow in the air flow space formed between the rear end ring 113 and the middle disk 111 has a greater possibility of generating vortices or separation when changing the flow direction. The distance between the rear end ring 113 and the middle disk 111 is set to be greater than the distance between the front end ring 115 and the middle disk 111. At this time, the space for air flow formed between the rear end ring 113 and the middle disk 111 is close to the air outlet end of the impeller structure 10. That is, the distance between the rear end ring 113 and the middle disk 111 is set to be greater than the distance between the front end ring 115 and the middle disk 111, so that the air flow space between the rear end ring 113 and the middle disk 111 near the air outlet end of the impeller structure 10 is greater than the air flow space between the front end ring 115 and the middle disk 111 near the air inlet end, thereby increasing the air flow area of ​​the air flow space near the air outlet end, reducing the air flow loss in the air flow space between the rear end ring 113 and the middle disk 111, and reducing the possibility of vortex generation, thereby further increasing the structural stability and aerodynamic efficiency of the blades 13 and the impeller structure 10.

[0051] The utility model technical solution also proposes a fan 100, combined with reference Figures 1 to 5 The fan 100 includes a volute 30, a motor (not shown in the figure) and an impeller structure 10 as in any of the above embodiments; the volute 30 is formed with an air inlet 31 arranged in the direction of extension of the blades 13; the motor is fixedly connected to the volute 30 on the side close to the air inlet 31; the impeller structure 10 is fixedly connected to the volute 30, the base 11 is formed with a motor hole 117, and the motor at least partially extends into the air inlet 31 and is penetrated by the motor hole 117. The specific structure of the impeller structure 10 refers to the above embodiments. Since the impeller structure 10 of this solution adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0052] It can be understood that the volute 30 is used to guide the air flow and increase the air pressure during the air flow process. It has an external contour shape in the shape of a snail shell. The air inlet 31 provided in the volute 30 is used to guide the air into the impeller and change the flow direction and speed of the airflow. Furthermore, the flow speed and pressure of the airflow can be further increased by reducing the cross-sectional area of ​​the volute 30, thereby improving the working efficiency of the fan 100. The motor is used as the power source of the fan 100 to drive the impeller structure 10 to rotate. Specifically, it can be provided with a motor shaft, and at least part of the motor shaft is extended into the air inlet 31 and penetrated through the motor hole 117 provided in the middle disk 111. In this way, the rotation of the motor shaft itself can drive the middle disk 111 and then drive the entire impeller structure 10 to rotate. The speed and power of the motor determine the output air volume and air pressure of the fan 100.

[0053] In some embodiments of the present invention, Figures 1 to 5 As shown, the fan 100 includes a plurality of impeller structures 10 , which are sequentially connected along the extension direction of the blades 13 , and the blades 13 of each impeller structure 10 are staggered with the blades 13 of an adjacent impeller structure 10 .

[0054] It can be understood that staggering the blades 13 of multiple impeller structures 10 further increases the pressure rise of the fan 100. When air enters the impeller structure 10, the air flow at the outlet end of the previous impeller will bring a higher pressure to the inlet section of the next impeller, thereby increasing the air pressure of the entire fan 100 system when it finally discharges air, further improving the aerodynamic efficiency and working performance of the fan 100.

[0055] It should be noted that the staggered arrangement of the blades 13 of adjacent impeller structures 10 can also change the direction and speed of air flow. The effective transmission of gas between different impeller structures 10 further improves the continuity and flow distribution of the airflow, reduces obstructions and instability in the airflow process, achieves cyclone subdivision, makes the airflow flow smoother, reduces noise or vibration that may be generated during the air flow, further increases the aerodynamic efficiency and working performance of the fan 100 and the impeller structure 10, and improves the user experience.

[0056] The utility model technical solution also proposes a range hood 1000, combined with reference Figures 1 to 6 The range hood 1000 comprises a chassis 300 and a fan 100 as described in any of the above embodiments. The fan 100 is arranged in the chassis 300, and the volute 30 is further formed with an air outlet 33 extending toward the top of the chassis 300. The specific structure of the fan 100 refers to the above embodiments. Since the fan 100 of this solution adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0057] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An impeller structure, characterized in that: The impeller structure comprises: matrix; A plurality of blades, wherein the plurality of blades are embedded in the base and evenly distributed in an annular shape around the periphery of the base, and an air flow channel is formed between two adjacent blades; The base comprises a middle plate, a rear end ring and a front end ring, a plurality of blades are arranged through the middle plate, the middle of the blades are fixedly connected to the periphery of the middle plate, the cross section of the rear end ring is annular, and one end of the blade is fixedly connected to the wall of the rear end ring close to the middle plate; and The front ring has a ring-shaped cross section, the middle disk is sandwiched between the rear ring and the front ring, one end of the blade facing away from the rear ring is fixedly connected to the wall of the front ring close to the middle disk, and the distance between the rear ring and the middle disk is greater than the distance between the front ring and the middle disk; Wherein, a plurality of grooves are arranged on the circumferences of the two opposite sides of each blade at intervals along the length direction to form two opposite sawtooth-shaped edge lines, and a circular arc transition is arranged between two adjacent grooves; And / or, the bottom wall surface of the groove is an arc surface; The two rows of grooves arranged on the two side circumferences of each blade are staggered.

2. The impeller structure according to claim 1, characterized in that: The cross section of the blade is curved in an arc shape, and the bending directions of the plurality of blades are sequentially arranged in a clockwise direction along the periphery of the base; Alternatively, the bending directions of the plurality of blades are arranged in sequence in a counterclockwise direction along the periphery of the base.

3. The impeller structure according to claim 2, characterized in that: The outer contour line of the blade cross section is arranged in the form of an Archimedean spiral.

4. A fan, characterized in that: The fan comprises: A volute, wherein the volute is formed with an air suction port arranged in the extending direction of the blade; A motor, the motor being fixedly connected to a side of the volute close to the air inlet; and According to the impeller structure as described in any one of claims 1 to 3, the impeller structure is fixedly connected to the volute, the base is formed with a motor hole, and the motor at least partially extends into the air intake port and passes through the motor hole.

5. The fan according to claim 4, characterized in that: The fan comprises a plurality of impeller structures, which are sequentially connected along the extending direction of the blades, and the blades of each impeller structure are arranged alternately with the blades of an adjacent impeller structure.

6. A range hood, characterized in that: The range hood comprises a chassis and a fan as claimed in any one of claims 4 to 5, wherein the fan is arranged in the chassis, and the volute is further formed with an air outlet extending toward the top of the chassis.

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