Impeller, fan and range hood

Abstract

The impeller comprises a front disc, a rear disc and a plurality of blades which are distributed in the circumferential direction and connected between the front disc and the rear disc, and the thicknesses of the blades are gradually reduced in the direction opposite to the air inlet axial direction and in the radial extension direction of the impeller. According to the impeller, the thickness of the blades is changed, when the impeller rotates, the flow of air entering the impeller is gradually accumulated and increased in the air inlet axial direction, the change of the thickness of the blades can be matched with the change condition that the flow of air needing to be discharged in the impeller is gradually increased in the air inlet axial direction, and the consumed power is minimized. Meanwhile, the speed of air flowing into an impeller inlet can be prevented from changing drastically, and noise is effectively reduced. The invention further relates to a fan which comprises a volute, a motor and the impeller, the impeller is arranged in the volute, and the motor is arranged on the volute and is in driving connection with the impeller. The invention further relates to an extractor hood which comprises a machine shell and the draught fan, and the draught fan is arranged in the machine shell.

Description

Technical Field

[0001] The invention relates to an impeller, a fan and a range hood. Background Art

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate based on the principles of fluid dynamics, using a centrifugal fan installed within the hood to draw in and exhaust cooking fumes. A centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. As the impeller rotates, negative pressure is generated at the fan's center, drawing cooking fumes from beneath the hood into the fan. After being accelerated by the fan, the volute collects the fumes and guides them out of the room.

[0003] In order to reduce the risk of users hitting their heads and at the same time facilitate the thin design of the range hood and improve the aesthetics, thin fans have begun to be used in existing range hoods. For example, the Chinese invention patent "A Range Hood" with authorization announcement number CN113310085B (application number 202110586605.3) and the Chinese utility model patent "A Range Hood" with authorization announcement number CN215863629U (application number 202122053725.5) both use thin fans in the range hoods disclosed therein. However, due to the reduction in thickness of the thin fan, the air inlet space at the air inlet is relatively narrow. Especially in the case of small flow, the impeller load and impeller flow are uneven, and the instability in the impeller flow will develop and increase at the boundary position. There are more dead zones, resulting in more impeller vortices. In addition, during the operation of the fan, the air flow rate in the volute gradually increases along the air inlet axis. The air flow rate is the largest at the position where the motor is set on the volute, and the secondary vortex is more obvious on the edge of the volute where the motor is set. In the volute, the air flow after the impeller does work flows from the motor side to the air inlet side. These flows are not conducive to the efficiency of the centrifugal fan.

[0004] In existing fans, the blade width and thickness of the impeller are fixed, which cannot match the different air flow rates at different positions along the air inlet axis. Simply relying on increasing the impeller speed to meet the exhaust of the air flow on the atmospheric flow side leads to energy waste. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide an impeller that can reduce noise and increase airflow volume in response to the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a fan using the above-mentioned impeller in response to the above-mentioned prior art.

[0007] The third technical problem to be solved by the present invention is to provide a range hood using the aforementioned fan in response to the above-mentioned prior art.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: an impeller, including a front disk, a rear disk, and a plurality of blades distributed along the circumferential direction and connected between the front disk and the rear disk, and the thickness of the blades gradually decreases in the opposite direction of the air inlet axis and along the radial outward extension direction of the impeller.

[0009] Preferably, based on the variation in blade thickness, a sharp edge portion is formed at a radially outer position of the front portion of the blade.

[0010] As an improvement, the radial inner edge of the front portion of the blade is inclined outward in a radial direction opposite to the wind inlet axis.

[0011] As an improvement, the width of the blade increases along the air inlet axis.

[0012] Preferably, the width of the blade increases in a stepwise manner along the air inlet axis.

[0013] Preferably, the radial inner edge line of the blade includes at least two stepped axial extension line segments along the wind inlet axis, and two adjacent axial extension line segments are connected by an inclined line segment.

[0014] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a fan, including a volute, a motor, and the aforementioned impeller, the impeller is arranged in the volute, and the motor is arranged on the volute and is drivingly connected to the impeller.

[0015] To even out the incoming air flow, reduce air flow losses, and improve fan efficiency, a collector covering the impeller inlet is provided on the air inlet side of the volute.

[0016] The technical solution adopted by the present invention to solve the third technical problem is: a range hood, comprising a casing and the aforementioned fan, wherein the fan is arranged in the casing.

[0017] Compared with the existing technology, the present invention has the following advantages: the impeller of the present invention varies the blade thickness, setting the blade thickness to gradually decrease in the opposite direction of the air inlet axis and along the radial outward extension of the impeller. As the impeller rotates, the amount of air entering the impeller gradually accumulates and increases along the air inlet axis. The blade thickness variation of the present invention can match the gradual increase in the amount of air to be discharged from the impeller along the air inlet axis, minimizing power consumption. At the same time, it can prevent drastic changes in the air velocity entering the impeller at the impeller inlet, effectively reducing noise.

[0018] The fan using the impeller can reduce the noise during operation and increase the air flow rate per unit power consumption.

[0019] The range hood using the fan is conducive to the design of a thin fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 3D is a perspective view of an impeller in an embodiment of the present invention.

[0021] Figure 2 for Figure 1 Another perspective of the picture.

[0022] Figure 3 3D is a perspective view of a fan in an embodiment of the present invention.

[0023] Figure 4 for Figure 3 sectional view of . DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 and Figure 2 As shown, the impeller in this embodiment includes a front disk 1, a rear disk 2, and a plurality of blades 3 distributed along the circumferential direction and connected between the front disk 1 and the rear disk 2. The blades 3 are bent in the same direction in the radial direction. An air flow inlet for external airflow is formed at the position of the front disk 1, and the position of the rear disk 2 is relatively closed due to the setting of the motor 5. During operation, the air flow enters through the air flow inlet and is discharged radially outward under the action of the blades 3. The flow path of the air flow changes with a large curvature, and the problem of secondary vortex is prone to occur at the position of the rear disk 2 of the impeller. Based on the flow direction of the air flow, the air flow rate at the front air inlet side of the impeller is relatively small, and the air flow rate at the rear air inlet side of the impeller is relatively large.

[0026] In this embodiment, the thickness of the blade 3 gradually decreases in the opposite direction of the air inlet axis and along the radial outward extension direction of the impeller. In this way, based on the change in the thickness of the blade 3, a sharp edge portion 31 is formed at the radial outer position of the front of the blade 3. Since the edge portion 31 is a very thin and sharp part, the resistance to the incoming airflow is very small, thereby increasing the airflow entering the impeller with low noise. At the same time, the thickness change of the blade 3 matches the distribution of the airflow in the impeller along the air inlet axis, meeting the different airflow discharge requirements at different positions along the air inlet axis, minimizing the power consumption of the fan, reducing secondary vortexes, and reducing operating noise.

[0027] In addition, the radial inner edge of the front portion of the blade 3 in this embodiment is inclined radially outward in the opposite direction of the air inlet axis, which can further reduce the resistance to the airflow entering the impeller.

[0028] In addition, the width of the blade 3 in this embodiment increases along the air inlet axis. It can be specifically set as needed, such as a step-type change structure, or a linear change structure. In this embodiment, the width of the blade 3 on the impeller increases stepwise along the air inlet axis. Specifically, the radial inner edge line of the blade 3 includes at least two sections of stepped axial extension line segments 32 along the air inlet axis, and two adjacent axial extension line segments 32 are connected by an inclined line segment 33, and the air inlet end of the edge line of the impeller is an inclined line segment 33. And the length of the axial extension line segment 32 close to the upstream of the air inlet axis is greater than the length of the axial extension line segment 32 close to the downstream of the air inlet axis. The variable width setting of blade 3 can match the changes in airflow along the inlet axis, especially the airflow that accumulates in the midstream of the inlet axis due to turbulence caused by poor exhaust. Based on the width of blade 3 at the corresponding position and the length matching this width, it can fully meet the needs of quickly discharging the accumulated airflow. At the same time, in the downstream of the inlet axis, based on the setting of the maximum width of blade 3, it can generate the maximum discharge capacity, avoiding the generation of secondary vortices in this area and further pressure on the airflow in the midstream of the inlet axis. When the impeller is working, it can well match the airflow requirements and airflow characteristics at various positions along the inlet axis, timely discharge the airflow, minimize power consumption, avoid the generation of secondary vortices in the volute 4, reduce operating noise, and at the same time reduce the airflow loss due to fluid turbulence and increase the exhaust airflow.

[0029] like Figure 3 and Figure 4 As shown, the present invention also relates to a fan comprising a volute 4, a motor 5, and the aforementioned impeller. The impeller is disposed within the volute 4, and the motor 5 is disposed on the volute 4 and is drivingly connected to the impeller. A fan employing this impeller can reduce operating noise while increasing airflow per unit power consumption.

[0030] In order to make the airflow uniform, reduce airflow loss and improve fan efficiency, a collector 6 covering the impeller inlet is provided on the air inlet side of the volute 4 .

[0031] The present invention also relates to a range hood comprising a housing and the aforementioned fan, the fan being disposed within the housing. The range hood offers low noise, a better user experience, and a greater fume exhaust volume per unit power consumption, thereby resolving the issue of thin fans being used within the range hood and facilitating thin fan design.

[0032] In the present specification and claims, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Because the embodiments disclosed herein can be arranged in various orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. An impeller comprising a front disc (1), a rear disc (2), and a plurality of blades (3) distributed along the circumferential direction and connected between the front disc (1) and the rear disc (2), characterized in that: In the opposite direction of the air inlet axis and in the radial outward extension direction of the impeller, the thickness of the blade (3) gradually decreases.

2. The impeller according to claim 1, characterized in that: Based on the thickness variation of the blade (3), a sharp edge portion (31) is formed at the radially outer position of the front portion of the blade (3).

3. The impeller according to claim 1, characterized in that: The radial inner edge of the front portion of the blade (3) is inclined outward in the opposite radial direction to the air inlet axis.

4. The impeller according to any one of claims 1 to 3, characterized in that: The width of the blade (3) increases along the air inlet axis.

5. The impeller according to claim 4, characterized in that: The width of the blade (3) increases in a stepwise manner along the air inlet axis.

6. The impeller according to claim 5, characterized in that: The radial inner edge line of the blade (3) includes at least two stepped axial extension line segments (32) along the air inlet axis, and two adjacent axial extension line segments (32) are connected by an inclined line segment (33).

7. The impeller according to claim 6, characterized in that: The length of the axis extension line segment (32) close to the upstream of the air inlet axis is greater than the length of the axis extension line segment (32) close to the downstream of the air inlet axis.

8. A fan, comprising a volute (4) and a motor (5), characterized in that: It also includes the impeller according to any one of claims 1 to 7, wherein the impeller is arranged in the volute (4), and the motor (5) is arranged on the volute (4) and is drivingly connected to the impeller.

9. The fan according to claim 8, characterized in that: A collector (6) covering the impeller inlet is provided on the air inlet side of the volute (4).

10. A range hood, comprising a housing, characterized in that: It also includes the fan according to claim 8 or 9, wherein the fan is arranged in the casing.

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