Centrifugal fan impeller, centrifugal fan and range hood

Abstract

The centrifugal fan impeller comprises a bottom support, blades and a top support, the blades are installed between the bottom support and the top support, the bottom support is annular and is provided with a first installation hole, and the top support is provided with a second installation hole. The top bracket is annular and is provided with a second mounting hole; a bottom rotating shaft and a top rotating shaft are arranged at the two ends of the blade in the length direction respectively, the bottom rotating shaft is arranged in the first mounting hole and can rotate relative to the bottom support, and the top rotating shaft is arranged in the second mounting hole and can rotate relative to the top support; a rotating shaft is further arranged at the ends, corresponding to the top support, of the blades, the impeller further comprises an annular rotating support, the rotating shaft penetrates through the rotating support and can be driven by the rotating support, and therefore the blades can rotate around the rotating axis parallel to the axis of the impeller relative to the bottom support and the top support.

Description

Technical Field

[0001] The utility model relates to a power device, in particular to a centrifugal fan impeller, a centrifugal fan using the impeller, and a range hood using the centrifugal fan. Background Art

[0002] Multi-blade centrifugal fans have the characteristics of high pressure and low noise. Therefore, the current society generally uses multi-blade centrifugal fan systems as power sources, using high-speed rotating impellers to complete the two functions of work and filtering in the volute. For example, it is often used in range hoods, and the multi-blade centrifugal fan installed inside the range hood absorbs and exhausts oil smoke. The multi-blade centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, sucking the oil smoke under the range hood into the fan, and after being accelerated by the fan, it is collected by the volute and guided to be discharged outdoors.

[0003] After long-term use of the range hood, the impeller of the centrifugal fan is covered with oil, which will cause problems such as reduced exhaust efficiency and increased noise. Regular cleaning of the fan impeller of the range hood is conducive to efficient exhaust, saving electricity and increasing the service life of the range hood. Existing self-cleaning range hoods are usually cleaned with steam, hot water, etc., such as disclosed in Chinese patents 202322363220.8 and 202223613040.2.

[0004] However, since the fan impeller blades of most range hoods on the market are narrow, it is difficult to clean the blade gap. Sometimes, excessive force can easily cause the blades to deform and destroy the dynamic balance of the impeller. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a centrifugal fan impeller in view of the deficiencies in the above-mentioned prior art, wherein the blade gap of the impeller can be changed, thereby facilitating the cleaning of the impeller.

[0006] The second technical problem to be solved by the utility model is to provide a centrifugal fan using the above impeller.

[0007] The third technical problem to be solved by the present invention is to provide a range hood using the centrifugal fan.

[0008] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: a centrifugal fan impeller, including a bottom bracket, blades and a top bracket, the blades are installed between the bottom bracket and the top bracket, the bottom bracket is annular and has a first mounting hole, and the top bracket is annular and has a second mounting hole; the characteristics are:

[0009] The two ends of the blade in the length direction are respectively provided with a bottom rotating shaft and a top rotating shaft, the bottom rotating shaft is placed in the first mounting hole and can rotate relative to the bottom bracket, and the top rotating shaft is placed in the second mounting hole and can rotate relative to the top bracket;

[0010] The ends of the blades corresponding to the top brackets are also provided with rotating shafts, and the impeller also includes an annular rotating bracket. The rotating shaft passes through the rotating bracket and can be driven by the rotating bracket, thereby enabling the blades to rotate relative to the bottom bracket and the top bracket around a rotating axis parallel to the impeller axis.

[0011] By rotatably connecting the blades to the bottom bracket and the top bracket, the blade angle can be adjusted and the blade gap can be changed. When the impeller blades need to be cleaned, the blades can be turned to a suitable cleaning angle for cleaning. This is simple, convenient, and efficient, leaving no sanitary dead corners.

[0012] Furthermore, an arc-shaped first track is formed on the top bracket, the first track extends between the radial inner side and the radial outer side of the top bracket, and the rotating shaft passes through the first track and can move along the first track;

[0013] The rotating bracket is arranged on a side of the top bracket away from the bottom bracket and can be fixed and rotated relative to the top bracket. An arc-shaped second track is formed on the rotating bracket. The second track extends between the radial inner side and the radial outer side of the rotating bracket. The bending directions of the first track and the second track are opposite, and the rotating axis also passes through the second track.

[0014] Therefore, through the setting of the rotating bracket, it can cooperate with the top bracket so that the rotation of the rotating bracket can drive the blades to rotate as a whole without operating the blades individually. The adjustment is simple, and the rotating bracket can be fixed (locked) relative to the top bracket, which can facilitate the blades to be adjusted to the desired angle and maintain the desired state. The structure is simple and is not easy to destroy the dynamic balance of the impeller.

[0015] Preferably, the blade has an air inlet end and an air outlet end, the rotating shaft is arranged corresponding to the air inlet end, and the bottom rotating shaft and the top rotating shaft are arranged corresponding to the air outlet end.

[0016] Preferably, in order to facilitate the operation of the rotating bracket, a paddle is also formed on the rotating bracket.

[0017] The technical solution adopted by the utility model to solve the second technical problem is: a centrifugal fan, characterized in that: an impeller as described above is applied.

[0018] The technical solution adopted by the utility model to solve the third technical problem is: a range hood, characterized in that: the centrifugal fan as described above is applied.

[0019] Compared with the prior art, the advantage of the utility model is that by rotatably connecting the blades to the bottom bracket and the top bracket, the blade angle can be adjusted and the blade gap can be changed, so that when the impeller blades need to be cleaned, the blades can be turned to a suitable cleaning angle for cleaning, which is simple, convenient, and efficient, leaving no sanitary dead corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a first state of a centrifugal fan impeller according to an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of a centrifugal fan impeller according to an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of a rotating bracket of a centrifugal fan impeller according to an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of a blade of a centrifugal fan impeller according to an embodiment of the utility model;

[0024] Figure 5 A top view of a centrifugal fan impeller in a first state according to an embodiment of the utility model;

[0025] Figure 6 A top view of a centrifugal fan impeller in a first state of an embodiment of the utility model with a rotating bracket hidden;

[0026] Figure 7 A schematic diagram of a second state of a centrifugal fan impeller according to an embodiment of the utility model;

[0027] Figure 8 A top view of a centrifugal fan impeller in a second state according to an embodiment of the utility model;

[0028] Fig. 9 A top view of the centrifugal fan impeller in the second state of the embodiment of the utility model with the rotating bracket hidden DETAILED DESCRIPTION

[0029] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present utility model can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0031] See also Figure 1 to Figure 6 The invention discloses a centrifugal fan impeller, wherein the centrifugal fan used in the impeller can be mainly used for range hoods, and can also be used in other occasions requiring similar power devices.

[0032] The impeller includes a bottom bracket 1, blades 2, a top bracket 3 and a rotating bracket 4, and the bottom bracket 1, the top bracket 3 and the rotating bracket 4 are all in the shape of a ring. The impeller also includes a wheel disc 5 for installing a motor (for driving the impeller to rotate), and the wheel disc 5 can be connected to the top bracket 3 in one piece or in a separate piece. The rotating bracket 4 is closely attached to the side of the top bracket 3 away from the bottom bracket 1, and the shapes and sizes of the two are adapted.

[0033] A first mounting hole 11 is provided on the bottom bracket 1, a second mounting hole 31 is provided on the top bracket 3, and a bottom rotating shaft 21 and a top rotating shaft 22 are respectively provided at both ends of the length direction of the blade 2. The bottom rotating shaft 21 is placed in the first mounting hole 11 and can rotate relative to the first mounting hole 11, and the top rotating shaft 22 is placed in the second mounting hole 31 and can rotate relative to the second mounting hole 31. The rotation axis of the blade 2 is parallel to the impeller axis. The blade 2 has an air inlet end 23 and an air outlet end 24. The air inlet end 23 faces the oil smoke and allows the oil smoke to flow into the flow channel formed between two adjacent blades 2, while the air outlet end 24 is the end of the flow channel formed between two adjacent blades 2 for the oil smoke to flow out. The above-mentioned bottom rotating shaft 21 and top rotating shaft 22 are arranged corresponding to the air outlet end 24 and are coaxial.

[0034] The ends of the blades 2 corresponding to the top bracket 3 are also provided with a rotating shaft 25, and the rotating shaft 25 is provided corresponding to the air inlet end 23. A first track 32 is also formed on the top bracket 3, and a second track 41 is formed on the rotating bracket 4. The first track 32 and the second track 41 are both in the form of through grooves and are both arc-shaped. Each track extends between the radial inner side and the radial outer side of the corresponding bracket, and the first track 32 and the second track 41 are bent in opposite directions. Figure 5 , wherein the dotted line is the first track 32, which is convex in the clockwise direction, and the solid line is the first track 41, which is convex in the counterclockwise direction ( Figure 8 The same dotted line in the figure is the first track 32). The rotating shaft 25 passes through the first track 32 and the second track 41. When the second track 41 rotates around the impeller axis, it can drive the rotating shaft 25 to move along the first track 32. The width (circumferential dimension) of the second track 41 is equal to that of the first track 32, and can be slightly larger than the diameter of the rotating shaft 25. When the two tracks rotate relative to each other, the position of the rotating shaft 25 stuck in the two tracks can be changed, thereby changing the angle of the blade 2.

[0035] A paddle 42 is also formed on the rotating bracket 4 , and can be disposed, for example, between two adjacent first rails 41 .

[0036] The impeller can be in a first state (working state) and a second state (cleaning state). Figure 1 As shown, at this time, there is a certain angle between the blade 2 and the outer circumference of the impeller, and the rotating shaft 25 is close to the main axis of the impeller (as shown in the figure, it is close to the radial inner side of the top bracket 3 or the top bracket 4), that is, it is located at the first extreme position where the two tracks intersect. At this time, the rotating bracket 4 and the top bracket 3 are fixed with screws or other means to ensure that the impeller is installed in the range hood and operates normally. When the impeller needs to be cleaned, the impeller is removed, and after each bracket is cleaned, the fixed state of the rotating bracket 4 is released, and the paddle 42 is moved to make the rotating bracket 4 rotate clockwise (or counterclockwise) relative to the top bracket 3 by a certain angle, and the rotating shaft 25 rotates from the first state position to the second state position, see Figure 7 to Figure 9 , that is, the impeller is in a clean state, blade 2 is almost parallel to the outer circumference of the impeller, and the blade part is cleaned at this time to solve the problem of narrow blade spacing and inconvenient cleaning.

Claims

1. A centrifugal fan impeller, comprising a bottom bracket (1), a blade (2) and a top bracket (3), wherein the blade (2) is mounted between the bottom bracket (1) and the top bracket (3), the bottom bracket (1) is annular and has a first mounting hole (11), and the top bracket (3) is annular and has a second mounting hole (31); characterized in that: The blade (2) is provided with a bottom rotating shaft (21) and a top rotating shaft (22) at both ends in the length direction, respectively; the bottom rotating shaft (21) is placed in the first mounting hole (11) and can rotate relative to the bottom bracket (1); the top rotating shaft (22) is placed in the second mounting hole (31) and can rotate relative to the top bracket (3); The ends of the blades (2) corresponding to the top bracket (3) are also provided with a rotating shaft (25), and the impeller also includes an annular rotating bracket (4). The rotating shaft (25) passes through the rotating bracket (4) and can be driven by the rotating bracket (4), thereby enabling the blades (2) to rotate relative to the bottom bracket (1) and the top bracket (3) around a rotating axis parallel to the impeller axis.

2. The centrifugal fan impeller according to claim 1, characterized in that: The top bracket (3) is also provided with an arc-shaped first track (32), the first track (32) extending between the radial inner side and the radial outer side of the top bracket (3), and the rotating shaft (25) passes through the first track (32) and can move along the first track (32); The rotating bracket (4) is arranged on a side of the top bracket (3) away from the bottom bracket (1) and can be fixed and rotated relative to the top bracket (3); an arc-shaped second track (41) is formed on the rotating bracket (4); the second track (41) extends between the radial inner side and the radial outer side of the rotating bracket (4); the bending directions of the first track (32) and the second track (41) are opposite; and the rotating shaft (25) also passes through the second track (41).

3. The centrifugal fan impeller according to claim 1, characterized in that: The blade (2) has an air inlet end (23) and an air outlet end (24); the rotating shaft (25) is arranged corresponding to the air inlet end (23); and the bottom rotating shaft (21) and the top rotating shaft (22) are arranged corresponding to the air outlet end (24).

4. The centrifugal fan impeller according to claim 1, characterized in that: A paddle (42) is also formed on the rotating bracket (4).

5. A centrifugal fan, characterized in that: The impeller according to any one of claims 1 to 4 is used.

6. A range hood, characterized in that: The centrifugal fan as claimed in claim 5 is used.

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