Centrifugal fan impeller, centrifugal fan and range hood

Abstract

The utility model discloses a centrifugal fan impeller, a centrifugal fan and a range hood. The centrifugal fan impeller comprises a bottom support, blades and a top support. A bottom rotating shaft and a top rotating shaft are arranged at the two ends of each blade in the length direction correspondingly, the bottom rotating shafts are rotationally connected with the bottom supports, and the top rotating shafts are rotationally connected with the top supports. A rotating rod is further arranged on the top rotating shaft of the blade, and the rotating rod and the top rotating shaft are arranged at an angle; the top support comprises a first support and a second support which are arranged in the axial direction of the impeller at intervals, a peripheral wall is arranged between the peripheries of the first support and the second support, the first support is close to the blades, and the second support is far away from the blades relative to the first support. A rail groove is formed in the peripheral wall, extends between the first support and the second support and inclines relative to the axis of the impeller, the rotating rods of the blades are inserted into the rail groove and move along the rail groove, and the top rotating shaft keeps the trend of moving towards the first 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; characterized in that:

[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 rotatably connected to the bottom bracket, and the top rotating shaft is rotatably connected to the top bracket;

[0010] A rotating rod is also provided on the top rotating shaft of the blade, and the rotating rod is arranged at an angle with the top rotating shaft;

[0011] The top bracket comprises a first bracket and a second bracket arranged at intervals along the axial direction of the impeller, an outer peripheral wall is arranged between the outer peripheries of the first bracket and the second bracket, the first bracket is arranged close to the blades, and the second bracket is arranged relative to the first bracket and away from the blades;

[0012] A track groove is provided on the outer peripheral wall, the track groove extends between the first bracket and the second bracket, and is inclined relative to the axis of the impeller. The rotating rod of the blade is inserted into the track groove and moves along the track groove, and the top rotating shaft maintains a tendency to move toward the first bracket.

[0013] 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, which is simple, convenient, and efficient without leaving any sanitary dead corners.

[0014] In order to facilitate the rotation of the blades, the locking and unlocking of the blade positions, the impeller also includes a rotating bracket that can rotate relative to the top bracket. The rotating bracket is in the shape of a ring. A slot is provided on the rotating bracket. The slot includes a first slot portion, a second slot portion, and a third slot portion. The first slot portion and the third slot portion both extend along the circumferential direction, and the second slot portion extends along the axial direction. The two ends of the second slot portion are respectively connected to the first slot portion and the third slot portion, thereby forming a C-shaped slot. The rotating rod passes through the slot, and the rotating bracket enables the rotating rod to be locked in the first slot portion or the third slot portion. In addition, by setting the rotating bracket, it can cooperate with the top bracket, so that the rotating bracket can drive the blade to rotate as a whole without operating the blade separately. The adjustment is simple, and the structure is simple, and it is not easy to destroy the dynamic balance of the impeller.

[0015] In order to facilitate the automatic movement of the rotating rod of the blade along the track groove after unlocking, the impeller also includes a wave spring arranged in the top bracket. The wave spring is also annular as a whole and is fixed in the top bracket. The top rotating shaft of the blade passes through the wave spring, so that the rotating rod is located on the side of the first bracket of the wave spring away from the top bracket. The wave spring makes the top rotating shaft maintain the tendency to move toward the first bracket.

[0016] Preferably, in order to facilitate the rotation of the rotating bracket, a shifting post is also provided on the rotating bracket.

[0017] Preferably, in order to facilitate the resetting of the rotating bracket, a resetting spring is provided between the shifting post and the top bracket for resetting the rotating bracket after rotation.

[0018] 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.

[0019] 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.

[0020] 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

[0021] Figure 1 This is a schematic diagram of a first state of a centrifugal fan impeller according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the exploded structure of a centrifugal fan impeller according to an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of a hidden bottom bracket and blades of a centrifugal fan impeller according to an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of a blade of a centrifugal fan impeller according to an embodiment of the utility model;

[0025] Figure 5 A side view of a centrifugal fan impeller in a first state according to an embodiment of the utility model;

[0026] Figure 6 A partial cross-sectional view of a centrifugal fan impeller in a first state according to an embodiment of the utility model;

[0027] Figure 7 A schematic diagram of a second state of a centrifugal fan impeller according to an embodiment of the utility model;

[0028] Figure 8 A side view of a centrifugal fan impeller in a second state according to an embodiment of the utility model;

[0029] Fig. 9 This is a partial cross-sectional view of the second state of the centrifugal fan impeller according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The impeller includes a bottom bracket 1, blades 2, a top bracket 3, a rotating bracket 4 and a wave spring 6. The impeller also includes a wheel disc 5 for installing a motor (for driving the impeller to rotate). The wheel disc 5 can be connected to the top bracket 3 in one piece or in a separate piece.

[0034] 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 bottom rotating shaft 21 and the top rotating shaft 22 are coaxially arranged. The rotation axis of the blade 2 is parallel to the axis X of the impeller.

[0035] A rotating rod 23 is also provided on the top rotating shaft 22 of the blade 2. The rotating rod 23 is arranged at an angle to the top rotating shaft 22. Preferably, the rotating rod 23 and the top rotating shaft 22 are perpendicular to each other.

[0036] The top bracket 3 includes a first bracket 32 ​​and a second bracket 33 arranged at intervals along the axial direction of the impeller. The first bracket 32 ​​and the second bracket 33 are both in annular shape. An outer peripheral wall 34 is provided between the outer peripheries of the first bracket 32 ​​and the second bracket 33, and the inner peripheries of the first bracket 32 ​​and the second bracket 33 are open. The cross section of the top bracket 3 is roughly annular. The first bracket 32, the second bracket 33 and the outer peripheral wall 34 are preferably integrally formed. The first bracket 32 ​​can be arranged close to the blade 2, while the second bracket 33 is arranged away from the blade 2 relative to the first bracket 32, and the second mounting hole 31 is provided on the first bracket 32.

[0037] A track groove 341 is formed on the outer peripheral wall 34. The track groove 341 extends between the first bracket 32 ​​and the second bracket 33, and the track groove 341 is inclined relative to the axis X of the impeller, thereby forming an inclined track. The rotating rod 23 of the blade 2 is inserted into the track groove 341. Due to the limiting effect of the track groove 341, the rotating rod 23 can rotate at a certain angle when moving in the vertical direction.

[0038] The rotating bracket 4 and the wave spring 6 are placed in the top bracket 3. The rotating bracket 4 is annular, and a slot 41 is provided thereon. The track slot 341 and the slot 41 are both through slots, and the rotating rod 23 passes through the slot 41 and the track slot 41. The slot 41 is C-shaped, that is, it includes a first slot portion 411, a second slot portion 412 and a third slot portion 413, wherein the first slot portion 411 and the third slot portion 413 both extend along the circumferential direction, and the second slot portion 412 extends along the axial direction, and the two ends of the second slot portion 412 are respectively connected to the first slot portion 411 and the third slot portion 413. The wave spring 6 is also annular as a whole and is fixed in the top bracket 3. The top rotating shaft 22 of the blade 2 passes through the wave spring 6, so that the rotating rod 23 is located on the side of the wave spring 6 away from the first bracket 32 ​​of the top bracket 3. The wave spring 6 applies a downward force to the top rotating shaft 22 of the blade 2. When the rotating bracket 4 is rotated to release the limiting effect on the rotating rod 23, the rotating rod 23 moves along the track groove 341 toward the first bracket 32 ​​under the pressure of the wave spring 6. The wave spring 6 can also be replaced by a small spring provided at the top of the top rotating shaft 22 of each blade 2 to apply a force to the top rotating shaft 22 in the direction of the first bracket 32.

[0039] The rotating bracket 4 is also provided with a lever 42 for driving the rotating bracket 4 to rotate, and the rotation axis thereof is the axis X of the impeller.

[0040] The first groove portion 411 and the third groove portion 413 can be of equal length, or one of them can be slightly longer. For example, in the present embodiment, the length (the dimension in the circumferential direction) of the third groove portion 413 is greater than that of the first groove portion 411. The height (the dimension in the axial direction) of the first groove portion 411 is less than that of the third groove portion 413, and the upper edge of the third groove portion 413 close to the second bracket 33 can be inclined. The rotating rod 23 of the blade 2 is inserted into the slot 41, and the first slot portion 411 is used to limit the movement of the rotating rod 23 along the track groove 341 when the rotating rod 23 is located at the upper limit position of the track groove 341 (the position closest to the second bracket 33). When the lever 42 is turned and the rotating bracket 4 is rotated, the limiting effect on the rotating rod 23 is released, and the rotating rod 23 moves to the lower limit position of the track groove 341 (the position closest to the first bracket 32) under the pressure of the wave spring 6. At this time, the rotating rod 23 is located in the third groove portion 413, see Figure 7 to Figure 9 .

[0041] A reset spring 7 is provided between the lever 42 and the top bracket 3, and is used to reset the rotating bracket 4 after the rotating bracket 4 is rotated. At least three reset springs 7 are arranged symmetrically along the circumferential direction of the impeller. When the rotating rod 23 needs to be reset, the blade 2 is forced toward the top bracket 3, and the rotating rod 23 presses the inclined surface of the third groove portion 413, and the rotating bracket 4 rotates to clear the track groove 341, so that the rotating rod 23 moves to the upper limit position. Under the action of the reset spring 7, the rotating bracket 4 is reset to Figure 1 In the state shown, the limiting function of the rotating bracket 4 continues to be performed.

[0042] The impeller can be in a first state (working state) and a second state (cleaning state). In the following description of the state change, "up" and "down" are the directions shown in the figure. Figure 1 , Figure 5 and Figure 6 As shown, at this time, there is a certain angle between the blade 2 and the outer circumference of the impeller, and the rotating rod 23 is limited by the rotating bracket 4 at the upper limit position of the track groove 341. The impeller is installed inside the range hood and operates normally. When the impeller needs to be cleaned, the impeller is removed, and after each bracket part is cleaned, the lever 42 is turned to rotate the bracket 4 counterclockwise to a certain angle, and the limit of the rotating rod 23 is released. Under the pressure of the wave spring 6, the rotating rod 23 slides downward along the track groove 341, and the blade 2 starts to rotate relative to the top bracket 3 and the bottom bracket 1, thereby changing the state until the rotating rod 23 reaches the lower limit position, so that the impeller 2 is in the second state, see Figure 7 to Figure 9 , blade 2 is almost parallel to the outer circumference of the impeller, and at this time, blade 2 can be cleaned. By rotating blade 2, the problem of narrow blade spacing and poor cleaning is solved.

[0043] After cleaning, an upward pressure is applied to the bottom bracket 1, so that the rotating rod 23 of each blade 2 moves upward along the track groove 341, the rotating rod 23 squeezes the inclined surface of the slot 41, and the rotating bracket 4 rotates to clear the track groove 341. When the rotating rod 23 reaches the upper limit position, the rotating bracket 4 is reset to the upper limit position under the action of the reset spring 7. Figure 1 In the state shown, the limiting function of the rotating bracket 4 continues to be performed. The impeller is restored to the first state.

[0044] By providing the rotating bracket 4 , each blade 2 can be unlocked and locked synchronously and conveniently. Of course, the rotating bracket 4 may not be provided, and each blade 2 can be unlocked and locked.

Claims

1. A centrifugal fan impeller, comprising a bottom bracket (1), blades (2) and a top bracket (3); 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 rotatably connected to the bottom bracket (1), and the top rotating shaft (22) is rotatably connected to the top bracket (3); A rotating rod (23) is also provided on the top rotating shaft (22) of the blade (2), and the rotating rod (23) is arranged at an angle with the top rotating shaft (22); The top bracket (3) comprises a first bracket (32) and a second bracket (33) which are arranged at intervals along the axial direction of the impeller, an outer peripheral wall (34) is arranged between the outer peripheries of the first bracket (32) and the second bracket (33), the first bracket (32) is arranged close to the blade (2), and the second bracket (33) is arranged away from the blade (2) relative to the first bracket (32); A track groove (341) is provided on the outer peripheral wall (34), the track groove (341) extends between the first bracket (32) and the second bracket (33), and the track groove (341) is inclined relative to the axis (X) of the impeller, the rotating rod (23) of the blade (2) is inserted into the track groove (341) and moves along the track groove (341), and the top rotating shaft (22) maintains a tendency to move toward the first bracket (32).

2. The centrifugal fan impeller according to claim 1, characterized in that: The impeller further comprises a rotating bracket (4) capable of rotating relative to the top bracket (3); the rotating bracket (4) is in the shape of a ring; a slot (41) is provided on the rotating bracket (4); the slot comprises a first slot portion (411), a second slot portion (412) and a third slot portion (413); the first slot portion (411) and the third slot portion (413) both extend in the circumferential direction; the second slot portion (412) extends in the axial direction; two ends of the second slot portion (412) are respectively connected to the first slot portion (411) and the third slot portion (413), thereby forming a C-shaped slot (41); the rotating rod (23) passes through the slot (41); and the rotating bracket (4) enables the rotating rod (23) to be locked in the first slot portion (411) or the third slot portion (413).

3. The centrifugal fan impeller according to claim 2, characterized in that: The impeller further comprises a wave spring (6) arranged in the top bracket (3); the wave spring (6) is also annular as a whole and is fixed in the top bracket (3); the top rotating shaft (22) of the blade (2) passes through the wave spring (6), so that the rotating rod (23) is located on the side of the wave spring (6) away from the first bracket (32) of the top bracket (3); the wave spring (6) makes the top rotating shaft (22) maintain a tendency to move toward the first bracket (32).

4. The centrifugal fan impeller according to claim 2, characterized in that: The rotating bracket (4) is also provided with a shifting post (42).

5. The centrifugal fan impeller according to claim 4, characterized in that: A return spring (7) is arranged between the shifting post (42) and the top bracket (3) for returning the rotating bracket (4) to its original position after rotation.

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

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

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